Druid坐标引入

<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.2.15</version>
</dependency>

maven仓库Maven Repository: com.alibaba » druid (mvnrepository.com)

配置Druid数据源

spring:
  datasource:
    username: root
    password: 123456
    # 假如sql连接异常,有可能是时区原因 添加时区& serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/sqlstudy?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver
    # 配置druid数据源
    type: com.alibaba.druid.pool.DruidDataSource

查看配置是否成功

application.yml新增配置项

spring:
  datasource:
    username: root
    password: 123456
    # 假如sql连接异常,有可能是时区原因 添加时区& serverTimezone=UTC
    url: jdbc:mysql://localhost:3306/sqlstudy?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    driver-class-name: com.mysql.cj.jdbc.Driver
    # 配置druid数据源
    type: com.alibaba.druid.pool.DruidDataSource
    

    #Spring Boot 默认是不注入这些属性值的，需要自己绑定
    #druid 数据源专有配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true

    #配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入
    #如果允许时报错  java.lang.ClassNotFoundException: org.apache.log4j.Priority
    #则导入 log4j 依赖即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

配置了log4j,必须要先添加log4j依赖,否则springboot项目会报错

DruidConfig配置类

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.util.HashMap;

/**
 * @author tian
 */
@Configuration
public class DruidConfig {
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource(){
        return new DruidDataSource();
    }

    /**
     * 后台监控:web.xml ServletRegistrationBean
     * springBoot内置了servlet容器 所以没有web.xml 替代方法:ServletRegistrationBean
     * @return
     */
    @Bean
    public ServletRegistrationBean a(){
        ServletRegistrationBean<StatViewServlet> bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");

        // 后台需要有人登录 账号密码配置
        HashMap<String,String> initParameters = new HashMap<>();
        // 添加配置 登录key是固定的loginUsername&loginPassword
        initParameters.put("loginUsername","admin");
        initParameters.put("loginPassword","123456");
        // 允许谁可以访问 ""所有人可以访问   禁止谁访问initParameters.put("kkk","192.168.128.128");
        initParameters.put("allow","");

        // 设置初始化参数
        bean.setInitParameters(initParameters);

        return bean;
    }
}

测试

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