1. 初始化项目

1.1 搭建springboot 项目

• pom.xml 设置

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.kenny</groupId>
    <artifactId>springbootSecurity</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.5.0</version>
    </parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>
</project>

• 创建Spring Boot 启动类

package com.kenny;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class SecurityApplication {
    public static void main(String[] args) {
        SpringApplication.run(SecurityApplication.class,args);
    }
}

• 创建Controller

package com.kenny.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello() {
        return "hello";
    }
}

• import SpringSecurity dependency

<dependency>
          <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-security</artifactId>
</dependency>

项目启动后浏览器进入会先跳转到登录页面，密码会输出在启动打印框中, 默认登录名为user

-- Spring Security 基于Servlet的Filter来执行的.

2. SpringSecurity 执行流程

SpringSecury 通过Servlet的FIlters来对访问数据执行控制

UsernamePasswordAuthenticationFilter:负责处理我们在登陆页面填写了用户名密码后的登陆请求。入门案例的认证工作主要有它负责。

ExceptionTranslationFilter：  处理过滤器链中抛出的任何AccessDeniedException和AuthenticationException 。

FilterSecurityInterceptor：  负责权限校验的过滤器。

2.1 思路分析

登录

​ ①自定义登录接口

​ 调用ProviderManager的方法进行认证 如果认证通过生成jwt

​ 把用户信息存入redis中

​ ②自定义UserDetailsService

​ 在这个实现类中去查询数据库

校验：

​ ①定义Jwt认证过滤器

​ 获取token

​ 解析token获取其中的userid

​ 从redis中获取用户信息

​ 存入SecurityContextHolder

2.2 准备工作

①添加依赖

<!--redis依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>
        <!--fastjson依赖-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.33</version>
        </dependency>
        <!--jwt依赖-->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.9.0</version>
        </dependency>

② 添加Redis相关配置 utils包下添加 FastJsonRedisSerializer类

package com.kenny.utils;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.parser.ParserConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.type.TypeFactory;
import org.springframework.data.redis.serializer.RedisSerializer;
import org.springframework.data.redis.serializer.SerializationException;

import java.nio.charset.Charset;

public class FastJsonRedisSerializer<T> implements RedisSerializer<T> {
    public static final Charset DEFAULT_CHARSET = Charset.forName("UTF-8");

    private Class<T> clazz;

    static {
        ParserConfig.getGlobalInstance().setAutoTypeSupport(true);
    }

    public FastJsonRedisSerializer(Class<T> clazz) {
        super();
        this.clazz = clazz;
    }

    @Override
    public byte[] serialize(T t) throws SerializationException {
        if (t == null) {
            return new byte[0];
        }
        return JSON.toJSONString(t, SerializerFeature.WriteClassName).getBytes(DEFAULT_CHARSET);
    }

    @Override
    public T deserialize(byte[] bytes) throws SerializationException {
        if (bytes == null || bytes.length <= 0) {return null;}
        String str = new String(bytes, DEFAULT_CHARSET);
        return JSON.parseObject(str,clazz);
    }

    protected JavaType getJavaType(Class<?> clazz) {
        return TypeFactory.defaultInstance().constructType(clazz);
    }

}

添加Redis 配置文件类

package com.kenny.config;

import com.kenny.utils.FastJsonRedisSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.StringRedisSerializer;

@Configuration
public class RedisConfig {
    @Bean
    @SuppressWarnings(value = {
            "unchecked", "rawtypes" })
    public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory connectionFactory)
    {
        RedisTemplate<Object, Object> template = new RedisTemplate<>();
        template.setConnectionFactory(connectionFactory);

        FastJsonRedisSerializer serializer = new FastJsonRedisSerializer(Object.class);

        // 使用StringRedisSerializer来序列化和反序列化redis的key值
        template.setKeySerializer(new StringRedisSerializer());
        template.setValueSerializer(serializer);

        // Hash的key也采用StringRedisSerializer的序列化方式
        template.setHashKeySerializer(new StringRedisSerializer());
        template.setHashValueSerializer(serializer);

        template.afterPropertiesSet();
        return template;
    }
}

将响应结果定义为一个通用的响应类

package com.kenny.domain;

import lombok.Data;

@Data
public class ResponseResult<T> {
    private Integer code;
    private String msg;

    public ResponseResult(Integer code, T data) {
        this.code = code;
        this.data = data;
    }

    private T data;

    public ResponseResult(Integer code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public ResponseResult(Integer code, String msg, T data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
}

添加Jwt工具类

package com.kenny.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.JwtBuilder;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Base64;
import java.util.Date;
import java.util.UUID;

public class JwtUtil {
    //有效期为
    public static final Long JWT_TTL = 60 * 60 * 1000L;// 60 * 60 *1000 一个小时
    //设置秘钥明文
    public static final String JWT_KEY = "kennya";

    public static String getUUID() {
        String token = UUID.randomUUID().toString().replaceAll("-", "");
        return token;
    }

    /**
     * 生成jtw * @param subject token中要存放的数据（json格式） * @return
     */
    public static String createJWT(String subject) {

        JwtBuilder builder = getJwtBuilder(subject, null, getUUID());// 设置过期时间
        return builder.compact();
    }

    /**
     * 生成jtw * @param subject token中要存放的数据（json格式） * @param ttlMillis token超时时间 * @return
     */
    public static String createJWT(String subject, Long ttlMillis) {

        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, getUUID());// 设置过期时间
        return builder.compact();
    }

    private static JwtBuilder getJwtBuilder(String subject, Long ttlMillis, String uuid) {
        SignatureAlgorithm signatureAlgorithm = SignatureAlgorithm.HS256;
        SecretKey secretKey = generalKey();
        long nowMillis = System.currentTimeMillis();
        Date now = new Date(nowMillis);
        if (ttlMillis == null) {

            ttlMillis = JwtUtil.JWT_TTL;
        }
        long expMillis = nowMillis + ttlMillis;
        Date expDate = new Date(expMillis);
        return Jwts.builder()
                .setId(uuid)              //唯一的ID
                .setSubject(subject)   // 主题 可以是JSON数据
                .setIssuer("kenny")     // 签发者
                .setIssuedAt(now)      // 签发时间
                .signWith(signatureAlgorithm, secretKey) //使用HS256对称加密算法签名, 第二个参数为秘钥
                .setExpiration(expDate);
    }

    /**
     * 创建token * @param id * @param subject * @param ttlMillis * @return
     */
    public static String createJWT(String id, String subject, Long ttlMillis) {
        JwtBuilder builder = getJwtBuilder(subject, ttlMillis, id);// 设置过期时间
        return builder.compact();
    }

    public static void main(String[] args) throws Exception {
//        String jwt = createJWT("1234");
        Claims claims = parseJWT("eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiI5NTllNmRjMmJlMzQ0ZjBiODA3Y2NmZGEwMTUzMjI3MiIsInN1YiI6IjEyMzQiLCJpc3MiOiJrZW5ueSIsImlhdCI6MTY1MDI2NTczMSwiZXhwIjoxNjUwMjY5MzMxfQ.2ht5C3JdOLqPPbzf5cyOeSG-V37hbJ10NY_YP8UAw_4");
        String subject = claims.getSubject();
        System.out.println(subject);
    }

    /**
     * 生成加密后的秘钥 secretKey * @return
     */
    public static SecretKey generalKey() {
        byte[] encodedKey = Base64.getDecoder().decode(JwtUtil.JWT_KEY);
        SecretKey key = new SecretKeySpec(encodedKey, 0, encodedKey.length, "AES");
        return key;
    }

    /**
     * 解析 * * @param jwt * @return * @throws Exception
     */
    public static Claims parseJWT(String jwt) throws Exception {
        SecretKey secretKey = generalKey();
        return Jwts.parser()
                .setSigningKey(secretKey)
                .parseClaimsJws(jwt)
                .getBody();
    }
}

添加RedisCache工具类

package com.kenny.utils;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundSetOperations;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.stereotype.Component;

import java.util.*;
import java.util.concurrent.TimeUnit;

@SuppressWarnings(value = {
        "unchecked", "rawtypes"})
@Component
public class RedisCache {

    @Autowired
    public RedisTemplate redisTemplate;

    /**
     * 缓存基本的对象，Integer、String、实体类等 * * @param key 缓存的键值 * @param value 缓存的值
     */
    public <T> void setCacheObject(final String key, final T value) {

        redisTemplate.opsForValue().set(key, value);
    }

    /**
     * 缓存基本的对象，Integer、String、实体类等 * * @param key 缓存的键值 * @param value 缓存的值 * @param timeout 时间 * @param timeUnit 时间颗粒度
     */
    public <T> void setCacheObject(final String key, final T value, final Integer timeout, final TimeUnit timeUnit) {

        redisTemplate.opsForValue().set(key, value, timeout, timeUnit);
    }

    /**
     * 设置有效时间 * * @param key Redis键 * @param timeout 超时时间 * @return true=设置成功；false=设置失败
     */
    public boolean expire(final String key, final long timeout) {

        return expire(key, timeout, TimeUnit.SECONDS);
    }

    /**
     * 设置有效时间 * * @param key Redis键 * @param timeout 超时时间 * @param unit 时间单位 * @return true=设置成功；false=设置失败
     */
    public boolean expire(final String key, final long timeout, final TimeUnit unit) {

        return redisTemplate.expire(key, timeout, unit);
    }

    /**
     * 获得缓存的基本对象。 * * @param key 缓存键值 * @return 缓存键值对应的数据
     */
    public <T> T getCacheObject(final String key) {
        ValueOperations<String, T> operation = redisTemplate.opsForValue();
        return operation.get(key);
    }

    /**
     * 删除单个对象 * * @param key
     */
    public boolean deleteObject(final String key) {

        return redisTemplate.delete(key);
    }

    /**
     * 删除集合对象 * * @param collection 多个对象 * @return
     */
    public long deleteObject(final Collection collection) {

        return redisTemplate.delete(collection);
    }

    /**
     * 缓存List数据 * * @param key 缓存的键值 * @param dataList 待缓存的List数据 * @return 缓存的对象
     */
    public <T> long setCacheList(final String key, final List<T> dataList) {

        Long count = redisTemplate.opsForList().rightPushAll(key, dataList);
        return count == null ? 0 : count;
    }

    /**
     * 获得缓存的list对象 * * @param key 缓存的键值 * @return 缓存键值对应的数据
     */
    public <T> List<T> getCacheList(final String key) {

        return redisTemplate.opsForList().range(key, 0, -1);
    }

    /**
     * 缓存Set * * @param key 缓存键值 * @param dataSet 缓存的数据 * @return 缓存数据的对象
     */
    public <T> BoundSetOperations<String, T> setCacheSet(final String key, final Set<T> dataSet) {

        BoundSetOperations<String, T> setOperation = redisTemplate.boundSetOps(key);
        Iterator<T> it = dataSet.iterator();
        while (it.hasNext()) {

            setOperation.add(it.next());
        }
        return setOperation;
    }

    /**
     * 获得缓存的set * * @param key * @return
     */
    public <T> Set<T> getCacheSet(final String key) {

        return redisTemplate.opsForSet().members(key);
    }

    /**
     * 缓存Map * * @param key * @param dataMap
     */
    public <T> void setCacheMap(final String key, final Map<String, T> dataMap) {

        if (dataMap != null) {

            redisTemplate.opsForHash().putAll(key, dataMap);
        }
    }

    /**
     * 获得缓存的Map * * @param key * @return
     */
    public <T> Map<String, T> getCacheMap(final String key) {

        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * 往Hash中存入数据 * * @param key Redis键 * @param hKey Hash键 * @param value 值
     */
    public <T> void setCacheMapValue(final String key, final String hKey, final T value) {

        redisTemplate.opsForHash().put(key, hKey, value);
    }

    /**
     * 获取Hash中的数据 * * @param key Redis键 * @param hKey Hash键 * @return Hash中的对象
     */
    public <T> T getCacheMapValue(final String key, final String hKey) {
        HashOperations<String, String, T> opsForHash = redisTemplate.opsForHash();
        return opsForHash.get(key, hKey);
    }

    /**
     * 删除Hash中的数据 * * @param key * @param hkey
     */
    public void delCacheMapValue(final String key, final String hkey) {

        HashOperations hashOperations = redisTemplate.opsForHash();
        hashOperations.delete(key, hkey);
    }

    /**
     * 获取多个Hash中的数据 * * @param key Redis键 * @param hKeys Hash键集合 * @return Hash对象集合
     */
    public <T> List<T> getMultiCacheMapValue(final String key, final Collection<Object> hKeys) {

        return redisTemplate.opsForHash().multiGet(key, hKeys);
    }

    /**
     * 获得缓存的基本对象列表 * * @param pattern 字符串前缀 * @return 对象列表
     */
    public Collection<String> keys(final String pattern) {

        return redisTemplate.keys(pattern);
    }
}

添加WebUtil类

package com.kenny.utils;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class WebUtils {

    /** * 将字符串渲染到客户端 * * @param response 渲染对象 * @param string 待渲染的字符串 * @return null */
    public static String renderString(HttpServletResponse response, String string) {
        try {
            response.setStatus(200);
            response.setContentType("application/json");
            response.setCharacterEncoding("UTF-8");
            response.getWriter().print(string);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

创建用户类

package com.kenny.domain;


import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;
import java.util.Date;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User implements Serializable {
    private static final long serialVersionUID = -40356785423868312L;

    /** * 主键 */
    private Long id;
    /** * 用户名 */
    private String userName;
    /** * 昵称 */
    private String nickName;
    /** * 密码 */
    private String password;
    /** * 账号状态（0正常 1停用） */
    private String status;
    /** * 邮箱 */
    private String email;
    /** * 手机号 */
    private String phonenumber;
    /** * 用户性别（0男，1女，2未知） */
    private String sex;
    /** * 头像 */
    private String avatar;
    /** * 用户类型（0管理员，1普通用户） */
    private String userType;
    /** * 创建人的用户id */
    private Long createBy;
    /** * 创建时间 */
    private Date createTime;
    /** * 更新人 */
    private Long updateBy;
    /** * 更新时间 */
    private Date updateTime;
    /** * 删除标志（0代表未删除，1代表已删除） */
    private Integer delFlag;
}

2.3 自定义一个UserDetailsService,让SpringSecurity使用我们的UserDetailsService。我们自己的UserDetailsService可以从数据库中查询用户名和密码。

准备工作

​ 创建一个用户表， 建表语句如下：

CREATE TABLE `sys_user` (
  `id` BIGINT(20) NOT NULL AUTO_INCREMENT COMMENT '主键',
  `user_name` VARCHAR(64) NOT NULL DEFAULT 'NULL' COMMENT '用户名',
  `nick_name` VARCHAR(64) NOT NULL DEFAULT 'NULL' COMMENT '昵称',
  `password` VARCHAR(64) NOT NULL DEFAULT 'NULL' COMMENT '密码',
  `status` CHAR(1) DEFAULT '0' COMMENT '账号状态（0正常 1停用）',
  `email` VARCHAR(64) DEFAULT NULL COMMENT '邮箱',
  `phonenumber` VARCHAR(32) DEFAULT NULL COMMENT '手机号',
  `sex` CHAR(1) DEFAULT NULL COMMENT '用户性别（0男，1女，2未知）',
  `avatar` VARCHAR(128) DEFAULT NULL COMMENT '头像',
  `user_type` CHAR(1) NOT NULL DEFAULT '1' COMMENT '用户类型（0管理员，1普通用户）',
  `create_by` BIGINT(20) DEFAULT NULL COMMENT '创建人的用户id',
  `create_time` DATETIME DEFAULT NULL COMMENT '创建时间',
  `update_by` BIGINT(20) DEFAULT NULL COMMENT '更新人',
  `update_time` DATETIME DEFAULT NULL COMMENT '更新时间',
  `del_flag` INT(11) DEFAULT '0' COMMENT '删除标志（0代表未删除，1代表已删除）',
  PRIMARY KEY (`id`)
) ENGINE=INNODB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COMMENT='用户表'

引入MybatisPuls和mysql驱动的依赖

<dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.3</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

application.yml 配置数据库信息

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/mydb?characterEncoding=utf-8&serverTimezone=UTC
    username: root
    password: root

定义Mapper接口

package com.kenny.mapper;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.kenny.domain.User;

public interface UserMapper extends BaseMapper<User> {
}

修改User实体类

类名上加@TableName(value = "sys_user") ,id字段上加 @TableId

package com.kenny.domain;


import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;
import java.util.Date;

@Data
@AllArgsConstructor
@NoArgsConstructor
@TableName(value = "sys_user")
public class User implements Serializable {
    private static final long serialVersionUID = -40356785423868312L;

    /** * 主键 */
    @TableId
    private Long id;
    /** * 用户名 */
    private String userName;
    /** * 昵称 */
    private String nickName;
    /** * 密码 */
    private String password;
    /** * 账号状态（0正常 1停用） */
    private String status;
    /** * 邮箱 */
    private String email;
    /** * 手机号 */
    private String phonenumber;
    /** * 用户性别（0男，1女，2未知） */
    private String sex;
    /** * 头像 */
    private String avatar;
    /** * 用户类型（0管理员，1普通用户） */
    private String userType;
    /** * 创建人的用户id */
    private Long createBy;
    /** * 创建时间 */
    private Date createTime;
    /** * 更新人 */
    private Long updateBy;
    /** * 更新时间 */
    private Date updateTime;
    /** * 删除标志（0代表未删除，1代表已删除） */
    private Integer delFlag;
}

SpringApplication运行类添加Mapper扫描注解

package com.kenny;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.kenny.mapper")
public class SecurityApplication {
    public static void main(String[] args) {
        SpringApplication.run(SecurityApplication.class,args);
    }
}

添加测试依赖

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

核心代码实现

创建一个类实现UserDetailsService接口，重写其中的方法。更加用户名从数据库中查询用户信息

package com.kenny.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.kenny.domain.LoginUser;
import com.kenny.domain.User;
import com.kenny.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

import java.util.Objects;

@Service
public class UserDetailsServiceImpl implements UserDetailsService {
    @Autowired
    private UserMapper userMapper;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(User::getUserName,username);
        User user = userMapper.selectOne(wrapper);
        if (Objects.isNull(user)) {
            throw new RuntimeException("Username or Password incorrect.");
        }
        return new LoginUser(user);
    }
}

创建LoginUser类并实现UserDetails类

package com.kenny.domain;

import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import java.util.Collection;

public class LoginUser implements UserDetails {
    private User user;

    public LoginUser(User user) {
        this.user = user;
    }

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return null;
    }

    @Override
    public String getPassword() {
        return user.getPassword();
    }

    @Override
    public String getUsername() {
        return user.getUserName();
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return true;
    }
}

2.4 创建SpringSecurity配置类，并将passwordEncoder改为BCryptPasswordEncoder类

package com.kenny.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
}

2.5 创建自定义登陆接口，并在SpringSecurity配置类中放行这个接口让客户端实现登陆

package com.kenny.controller;

import com.kenny.domain.ResponseResult;
import com.kenny.domain.User;
import com.kenny.service.LoginService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class LoginController {
    @Autowired
    private LoginService loginService;

    @PostMapping("/login")
    private ResponseResult login(@RequestBody User user) {
        return loginService.login(user);
    }
}

package com.kenny.service;

import com.kenny.domain.ResponseResult;
import com.kenny.domain.User;

public interface LoginService {

    ResponseResult login(User user);
}

package com.kenny.service.impl;

import com.kenny.domain.LoginUser;
import com.kenny.domain.ResponseResult;
import com.kenny.domain.User;
import com.kenny.service.LoginService;
import com.kenny.utils.JwtUtil;
import com.kenny.utils.RedisCache;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;

import java.util.HashMap;
import java.util.Objects;

public class LoginServiceImpl implements LoginService {
    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private RedisCache redisCache;

    @Override
    public ResponseResult login(User user) {
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(user.getUserName(), user.getPassword());
        Authentication authenticate = authenticationManager.authenticate(authenticationToken);
        if (Objects.isNull(authenticate)) {
            throw new RuntimeException("Username or Password incorrect.");
        }
        LoginUser loginUser = (LoginUser) authenticate.getPrincipal();
        String userId = loginUser.getUser().getId().toString();
        String jwt = JwtUtil.createJWT(userId);
        redisCache.setCacheObject("login:" + userId,loginUser);
        HashMap<String, String> map = new HashMap<>();
        map.put("token",jwt);
        return new ResponseResult(200,"Login success!",map);
    }
}

package com.kenny.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

2.6 认证过滤器

添加一个过滤器类，并在UsernamePasswordAuthenticationFilter类前对用户请求校验是否有token并且检查是否有效，没携带token则继续放行给后面filter使其执行登录操作，token有效则执行springsecurityContextHolder方法使其跳过后续登录校验操作。

package com.kenny.filter;

import com.kenny.domain.LoginUser;
import com.kenny.utils.JwtUtil;
import com.kenny.utils.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        //get token from frontEnd
        String token = httpServletRequest.getHeader("token");
        if (!StringUtils.hasText(token)) {
            //放行
            filterChain.doFilter(httpServletRequest,httpServletResponse);
            return;
        }
        //解析token
        String userid;
        try {
            Claims claims = JwtUtil.parseJWT(token);
            userid = claims.getSubject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("token invalid.");
        }
        //从redis中获取用户信息
        String redisKey = "login:" + userid;
        LoginUser loginUser = redisCache.getCacheObject(redisKey);
        if (!Objects.isNull(loginUser)) {
            throw new RuntimeException("User doesn't login.");
        }
        //存入SecurityContextHolder
        //TODO 获取权限信息封装到Authentication中
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(loginUser, null, null);
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
        filterChain.doFilter(httpServletRequest,httpServletResponse);
    }
}

在SecurityConfig配置类下添加JwtAuthenticationTokenFilter,并在 UsernamePasswordAuthenticationFilter类前执行

package com.kenny.config;

import com.kenny.filter.JwtAuthenticationTokenFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
    @Autowired
    JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();

        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

2.7 退出登陆

我们只需要定义一个登陆接口，然后获取SecurityContextHolder中的认证信息，删除redis中对应的数据即可。

package com.kenny.controller;

import com.kenny.domain.ResponseResult;
import com.kenny.domain.User;
import com.kenny.service.LoginService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/user")
public class LoginController {
    @Autowired
    private LoginService loginService;

    @PostMapping("/login")
    private ResponseResult login(@RequestBody User user) {
        return loginService.login(user);
    }

    @PostMapping("/logout")
    private ResponseResult logout() {
        return loginService.logout();
    }
}

package com.kenny.service.impl;

import com.kenny.domain.LoginUser;
import com.kenny.domain.ResponseResult;
import com.kenny.domain.User;
import com.kenny.service.LoginService;
import com.kenny.utils.JwtUtil;
import com.kenny.utils.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.HashMap;
import java.util.Objects;

@Service
public class LoginServiceImpl implements LoginService {
    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private RedisCache redisCache;

    @Override
    public ResponseResult login(User user) {
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(user.getUserName(), user.getPassword());
        Authentication authenticate = authenticationManager.authenticate(authenticationToken);
        if (Objects.isNull(authenticate)) {
            throw new RuntimeException("Username or Password incorrect.");
        }
        LoginUser loginUser = (LoginUser) authenticate.getPrincipal();
        String userId = loginUser.getUser().getId().toString();
        String jwt = JwtUtil.createJWT(userId);
        redisCache.setCacheObject("login:" + userId,loginUser);
        HashMap<String, String> map = new HashMap<>();
        map.put("token",jwt);
        return new ResponseResult(200,"Login success!",map);
    }

    @Override
    public ResponseResult logout() {
        LoginUser loginUser = (LoginUser) SecurityContextHolder.getContext().getAuthentication().getPrincipal();
        if (Objects.isNull(loginUser)) {
            throw new RuntimeException("Logout failed");
        }
        Long id = loginUser.getUser().getId();
        redisCache.deleteObject("login:" + id);
        SecurityContextHolder.getContext().setAuthentication(null);
        return new ResponseResult(200,"logout success.");
    }
}

3. 授权

3.1 授权基本流程

​ 在SpringSecurity中，会使用默认的FilterSecurityInterceptor来进行权限校验。在FilterSecurityInterceptor中会从SecurityContextHolder获取其中的Authentication，然后获取其中的权限信息。当前用户是否拥有访问当前资源所需的权限。

​ 所以我们在项目中只需要把当前登录用户的权限信息也存入Authentication。

​ 然后设置我们的资源所需要的权限即可。

3.2 授权实现

3.2.1 限制访问资源所需权限

​ SpringSecurity为我们提供了基于注解的权限控制方案，这也是我们项目中主要采用的方式。我们可以使用注解去指定访问对应的资源所需的权限。

​ 但是要使用它我们需要先开启相关配置。

package com.kenny;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;

@SpringBootApplication
@MapperScan("com.kenny.mapper")
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class SecurityApplication {
    public static void main(String[] args) {
        SpringApplication.run(SecurityApplication.class,args);
    }
}

然后就可以使用对应的注解。@PreAuthorize

package com.kenny.controller;

import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    @RequestMapping("/hello")
    @PreAuthorize("hasAuthority('test')")
    public String hello() {
        return "hello";
    }
}

3.2.2 封装权限信息

​ 我们前面在写UserDetailsServiceImpl的时候说过，在查询出用户后还要获取对应的权限信息，封装到UserDetails中返回。

​ 我们先直接把权限信息写死封装到UserDetails中进行测试。

​ 我们之前定义了UserDetails的实现类LoginUser，想要让其能封装权限信息就要对其进行修改。

package com.kenny.domain;

import com.alibaba.fastjson.annotation.JSONField;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

@Data
@NoArgsConstructor
public class LoginUser implements UserDetails {
    private User user;
    //存储权限信息
    private List<String> permissions;

    public LoginUser(User user) {
        this.user = user;
    }

    public LoginUser(User user, List<String> permissions) {
        this.user = user;
        this.permissions = permissions;
    }

    @JSONField(serialize = false)
    private List<GrantedAuthority> authorities;

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        if(authorities != null) {
            return authorities;
        }
        authorities = permissions.stream().map(SimpleGrantedAuthority::new)
                .collect(Collectors.toList());
        return authorities;
    }

    @Override
    public String getPassword() {
        return user.getPassword();
    }

    @Override
    public String getUsername() {
        return user.getUserName();
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return true;
    }
}

LoginUser修改完后我们就可以在UserDetailsServiceImpl中去把权限信息封装到LoginUser中了。我们写死权限进行测试，后面我们再从数据库中查询权限信息。

package com.kenny.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.kenny.domain.LoginUser;
import com.kenny.domain.User;
import com.kenny.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.stereotype.Service;

import java.util.Arrays;
import java.util.List;
import java.util.Objects;

@Service
public class UserDetailsServiceImpl implements UserDetailsService {
    @Autowired
    private UserMapper userMapper;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<>();
        wrapper.eq(User::getUserName,username);
        User user = userMapper.selectOne(wrapper);
        if (Objects.isNull(user)) {
            throw new RuntimeException("Username doesn't exist.");
        }
        List<String> list = Arrays.asList("test");
        return new LoginUser(user,list);
    }
}

校验的时候从redis中获取权限并赋值到SecurityContextHolder

package com.kenny.filter;

import com.kenny.domain.LoginUser;
import com.kenny.utils.JwtUtil;
import com.kenny.utils.RedisCache;
import io.jsonwebtoken.Claims;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {
    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        //get token from frontEnd
        String token = httpServletRequest.getHeader("token");
        if (!StringUtils.hasText(token)) {
            //放行
            filterChain.doFilter(httpServletRequest,httpServletResponse);
            return;
        }
        //解析token
        String userid;
        try {
            Claims claims = JwtUtil.parseJWT(token);
            userid = claims.getSubject();
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("token invalid.");
        }
        //从redis中获取用户信息
        String redisKey = "login:" + userid;
        LoginUser loginUser = redisCache.getCacheObject(redisKey);
        if (Objects.isNull(loginUser)) {
            throw new RuntimeException("User doesn't login.");
        }
        //存入SecurityContextHolder
        //TODO 获取权限信息封装到Authentication中
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(loginUser, null, loginUser.getAuthorities());
        SecurityContextHolder.getContext().setAuthentication(authenticationToken);
        filterChain.doFilter(httpServletRequest,httpServletResponse);
    }
}

4. 自定义失败处理

​ 我们还希望在认证失败或者是授权失败的情况下也能和我们的接口一样返回相同结构的json，这样可以让前端能对响应进行统一的处理。要实现这个功能我们需要知道SpringSecurity的异常处理机制。

​ 在SpringSecurity中，如果我们在认证或者授权的过程中出现了异常会被ExceptionTranslationFilter捕获到。在ExceptionTranslationFilter中会去判断是认证失败还是授权失败出现的异常。

​ 如果是认证过程中出现的异常会被封装成AuthenticationException然后调用AuthenticationEntryPoint对象的方法去进行异常处理。

​ 如果是授权过程中出现的异常会被封装成AccessDeniedException然后调用AccessDeniedHandler对象的方法去进行异常处理。

​ 所以如果我们需要自定义异常处理，我们只需要自定义AuthenticationEntryPoint和AccessDeniedHandler然后配置给SpringSecurity即可。

①自定义实现类

package com.kenny.handler;

import com.alibaba.fastjson.JSON;
import com.kenny.domain.ResponseResult;
import com.kenny.utils.WebUtils;
import org.springframework.http.HttpStatus;
import org.springframework.security.access.AccessDeniedException;
import org.springframework.security.web.access.AccessDeniedHandler;
import org.springframework.stereotype.Component;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class AccessDeniedHandlerImpl implements AccessDeniedHandler {
    @Override
    public void handle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AccessDeniedException e) throws IOException, ServletException {
        System.out.println(e.toString());
        ResponseResult result = new ResponseResult(HttpStatus.FORBIDDEN.value(), "权限不足");
        String json = JSON.toJSONString(result);
        WebUtils.renderString(httpServletResponse,json);
    }
}

package com.kenny.handler;

import com.alibaba.fastjson.JSON;
import com.kenny.domain.ResponseResult;
import com.kenny.utils.WebUtils;
import org.springframework.http.HttpStatus;
import org.springframework.security.core.AuthenticationException;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.stereotype.Component;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class AuthenticationENtryPointImpl implements AuthenticationEntryPoint {
    @Override
    public void commence(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, AuthenticationException e) throws IOException, ServletException {
        ResponseResult result = new ResponseResult(HttpStatus.UNAUTHORIZED.value(), "认证失败请重新登录");
        String json = JSON.toJSONString(result);
        WebUtils.renderString(httpServletResponse,json);
    }
}

②配置给SpringSecurity

先注入对应的处理器

package com.kenny.config;

import com.kenny.filter.JwtAuthenticationTokenFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.access.AccessDeniedHandler;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
    @Autowired
    JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;
    @Autowired
    private AuthenticationEntryPoint authenticationEntryPoint;
    @Autowired
    private AccessDeniedHandler accessDeniedHandler;
    
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();

        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        http.exceptionHandling().accessDeniedHandler(accessDeniedHandler).authenticationEntryPoint(authenticationEntryPoint);
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

5. 跨域

浏览器出于安全的考虑，使用 XMLHttpRequest对象发起 HTTP请求时必须遵守同源策略，否则就是跨域的HTTP请求，默认情况下是被禁止的。 同源策略要求源相同才能正常进行通信，即协议、域名、端口号都完全一致。

​ 前后端分离项目，前端项目和后端项目一般都不是同源的，所以肯定会存在跨域请求的问题。

​ 所以我们就要处理一下，让前端能进行跨域请求。

①先对SpringBoot配置，运行跨域请求

package com.kenny.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CorsConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        // 设置允许跨域的路径
        registry.addMapping("/**")
                // 设置允许跨域请求的域名
                .allowedOriginPatterns("*")
                // 是否允许cookie
                .allowCredentials(true)
                // 设置允许的请求方式
                .allowedMethods("GET", "POST", "DELETE", "PUT")
                // 设置允许的header属性
                .allowedHeaders("*")
                // 跨域允许时间
                .maxAge(3600);
    }
}

②开启SpringSecurity的跨域访问

由于我们的资源都会收到SpringSecurity的保护，所以想要跨域访问还要让SpringSecurity运行跨域访问。

package com.kenny.config;

import com.kenny.filter.JwtAuthenticationTokenFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.access.AccessDeniedHandler;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;

@Configuration
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
    @Autowired
    JwtAuthenticationTokenFilter jwtAuthenticationTokenFilter;
    @Autowired
    private AuthenticationEntryPoint authenticationEntryPoint;
    @Autowired
    private AccessDeniedHandler accessDeniedHandler;

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
                //关闭csrf
                .csrf().disable()
                //不通过Session获取SecurityContext
                .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS)
                .and()
                .authorizeRequests()
                // 对于登录接口 允许匿名访问
                .antMatchers("/user/login").anonymous()
                // 除上面外的所有请求全部需要鉴权认证
                .anyRequest().authenticated();

        http.addFilterBefore(jwtAuthenticationTokenFilter, UsernamePasswordAuthenticationFilter.class);
        http.exceptionHandling().accessDeniedHandler(accessDeniedHandler).authenticationEntryPoint(authenticationEntryPoint);
        //允许跨域
        http.cors();
    }

    @Bean
    @Override
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

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本文为[尧上有农]所创，转载请带上原文链接，感谢
blog.csdn.net/weixin_4384…