1.SSM整合理解
1.1什么是SSM整合？
微观：将学习的Spring SpringMVC Mybatis框架应用到项目中!
SpringMVC框架负责控制层
Spring 框架负责整体和业务层的声明式事务管理
MyBatis框架负责数据库访问层
宏观：Spring接管一切（将框架核心组件交给Spring进行IoC管理），代码更加简洁。
SpringMVC管理表述层、SpringMVC相关组件
Spring管理业务层、持久层、以及数据库相关（DataSource,MyBatis）的组件
使用IoC的方式管理一切所需组件
使用IoC的方式管理一切所需组
1.2什么是SSM整合？
①第一问：SSM整合需要几个IoC容器？
一个容器可能就够了，但是我们常见的操作是创建两个IoC容器（web容器和root容器），组件分类管理！
②第二问：每个IoC容器对应哪些类型组件？
③第三问：IoC容器之间关系和调用方向？
源码体现：
protected WebApplicationContext createWebApplicationContext(@Nullable ApplicationContext parent) {
Class<?> contextClass = getContextClass();
if (!ConfigurableWebApplicationContext.class.isAssignableFrom(contextClass)) {
throw new ApplicationContextException(
"Fatal initialization error in servlet with name '" + getServletName() +
"': custom WebApplicationContext class [" + contextClass.getName() +
"] is not of type ConfigurableWebApplicationContext");
}
ConfigurableWebApplicationContext wac =
(ConfigurableWebApplicationContext) BeanUtils.instantiateClass(contextClass);
wac.setEnvironment(getEnvironment());
//wac 就是web ioc容器
//parent 就是root ioc容器
//web容器设置root容器为父容器，所以web容器可以引用root容器
wac.setParent(parent);
String configLocation = getContextConfigLocation();
if (configLocation != null) {
wac.setConfigLocation(configLocation);
}
configureAndRefreshWebApplicationContext(wac);
return wac;
}
④具体多少配置类以及对应容器关系？
⑤IoC初始化方式和配置位置？
public class MyWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
//指定root容器对应的配置类
//root容器的配置类
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] { ServiceJavaConfig.class,MapperJavaConfig.class };
}
//指定web容器对应的配置类 webioc容器的配置类
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebJavaConfig.class };
}
//指定dispatcherServlet处理路径，通常为 /
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
}
图解配置类和容器配置：
2.SSM整合配置实战
2.1依赖整合和添加
①数据库准备
CREATE DATABASE `mybatis-example`;
USE `mybatis-example`;
CREATE TABLE `t_emp`(
emp_id INT AUTO_INCREMENT,
emp_name CHAR(100),
emp_salary DOUBLE(10,5),
PRIMARY KEY(emp_id)
);
INSERT INTO `t_emp`(emp_name,emp_salary) VALUES("tom",200.33);
INSERT INTO `t_emp`(emp_name,emp_salary) VALUES("jerry",666.66);
INSERT INTO `t_emp`(emp_name,emp_salary) VALUES("andy",777.77);
②准备项目
part04-ssm-integration
转成web项目
③依赖导入
pom.xml
<?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.atguigu</groupId>
<artifactId>part04-ssm-integration</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<spring.version>6.0.6</spring.version>
<jakarta.annotation-api.version>2.1.1</jakarta.annotation-api.version>
<jakarta.jakartaee-web-api.version>9.1.0</jakarta.jakartaee-web-api.version>
<jackson-databind.version>2.15.0</jackson-databind.version>
<hibernate-validator.version>8.0.0.Final</hibernate-validator.version>
<mybatis.version>3.5.11</mybatis.version>
<mysql.version>8.0.25</mysql.version>
<pagehelper.version>5.1.11</pagehelper.version>
<druid.version>1.2.8</druid.version>
<mybatis-spring.version>3.0.2</mybatis-spring.version>
<jakarta.servlet.jsp.jstl-api.version>3.0.0</jakarta.servlet.jsp.jstl-api.version>
<logback.version>1.2.3</logback.version>
<lombok.version>1.18.26</lombok.version>
<maven.compiler.source>17</maven.compiler.source>
<maven.compiler.target>17</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<!--
需要依赖清单分析:
spring
ioc/di
spring-context / 6.0.6
jakarta.annotation-api / 2.1.1 jsr250
aop
spring-aspects / 6.0.6
tx
spring-tx / 6.0.6
spring-jdbc / 6.0.6
springmvc
spring-webmvc 6.0.6
jakarta.jakartaee-web-api 9.1.0
jackson-databind 2.15.0
hibernate-validator / hibernate-validator-annotation-processor 8.0.0.Final
mybatis
mybatis / 3.5.11
mysql / 8.0.25
pagehelper / 5.1.11
整合需要
加载spring容器 spring-web / 6.0.6
整合mybatis mybatis-spring x x
数据库连接池 druid / x
lombok lombok / 1.18.26
logback logback/ 1.2.3
-->
<dependencies>
<!--spring pom.xml依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>jakarta.annotation</groupId>
<artifactId>jakarta.annotation-api</artifactId>
<version>${jakarta.annotation-api.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<!--
springmvc
spring-webmvc 6.0.6
jakarta.jakartaee-web-api 9.1.0
jackson-databind 2.15.0
hibernate-validator / hibernate-validator-annotation-processor 8.0.0.Final
-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>jakarta.platform</groupId>
<artifactId>jakarta.jakartaee-web-api</artifactId>
<version>${jakarta.jakartaee-web-api.version}</version>
<scope>provided</scope>
</dependency>
<!-- jsp需要依赖! jstl-->
<dependency>
<groupId>jakarta.servlet.jsp.jstl</groupId>
<artifactId>jakarta.servlet.jsp.jstl-api</artifactId>
<version>${jakarta.servlet.jsp.jstl-api.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${jackson-databind.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator -->
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>${hibernate-validator.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator-annotation-processor -->
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator-annotation-processor</artifactId>
<version>${hibernate-validator.version}</version>
</dependency>
<!--
mybatis
mybatis / 3.5.11
mysql / 8.0.25
pagehelper / 5.1.11
-->
<!-- mybatis依赖 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!-- MySQL驱动 mybatis底层依赖jdbc驱动实现,本次不需要导入连接池,mybatis自带! -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>${pagehelper.version}</version>
</dependency>
<!-- 整合第三方特殊依赖 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>${mybatis-spring.version}</version>
</dependency>
<!-- 日志 ， 会自动传递slf4j门面-->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>${logback.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>${druid.version}</version>
</dependency>
</dependencies>
</project>
④实体类添加
com.atguigu.pojo
@Data
public class Employee {
private Integer empId;
private String empName;
private Double empSalary;
}
⑤logback配置
位置：resources/logback.xml
<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">
<!-- 指定日志输出的位置，ConsoleAppender表示输出到控制台 -->
<appender name="STDOUT"
class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<!-- 日志输出的格式 -->
<!-- 按照顺序分别是：时间、日志级别、线程名称、打印日志的类、日志主体内容、换行 -->
<pattern>[%d{HH:mm:ss.SSS}] [%-5level] [%thread] [%logger] [%msg]%n</pattern>
<charset>UTF-8</charset>
</encoder>
</appender>
<!-- 设置全局日志级别。日志级别按顺序分别是：TRACE、DEBUG、INFO、WARN、ERROR -->
<!-- 指定任何一个日志级别都只打印当前级别和后面级别的日志。 -->
<root level="DEBUG">
<!-- 指定打印日志的appender，这里通过“STDOUT”引用了前面配置的appender -->
<appender-ref ref="STDOUT" />
</root>
<!-- 根据特殊需求指定局部日志级别，可也是包名或全类名。 -->
<logger name="com.atguigu.mybatis" level="DEBUG" />
</configuration>
2.2控制层配置编写(SpringMVC整合)
主要配置controller,springmvc相关组件配置
位置：WebJavaConfig.java(命名随意)
/**
* projectName: com.atguigu.config
*
* 1.实现Springmvc组件声明标准化接口WebMvcConfigurer 提供了各种组件对应的方法
* 2.添加配置类注解@Configuration
* 3.添加mvc复合功能开关@EnableWebMvc
* 4.添加controller层扫描注解
* 5.开启默认处理器,支持静态资源处理
*/
@Configuration
@EnableWebMvc
@ComponentScan("com.atguigu.controller")
public class WebJavaConfig implements WebMvcConfigurer {
//开启静态资源
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
2.3 业务层配置编写(AOP / TX整合）
主要配置service,注解aop和声明事务相关配置
/**
* projectName: com.atguigu.config
*
* 1. 声明@Configuration注解,代表配置类
* 2. 声明@EnableTransactionManagement注解,开启事务注解支持
* 3. 声明@EnableAspectJAutoProxy注解,开启aspect aop注解支持
* 4. 声明@ComponentScan("com.atguigu.service")注解,进行业务组件扫描
* 5. 声明transactionManager(DataSource dataSource)方法,指定具体的事务管理器
*/
@EnableTransactionManagement
@EnableAspectJAutoProxy
@Configuration
@ComponentScan("com.atguigu.service")
public class ServiceJavaConfig {
@Bean
public DataSourceTransactionManager transactionManager(DataSource dataSource){
DataSourceTransactionManager transactionManager = new DataSourceTransactionManager();
transactionManager.setDataSource(dataSource);
return transactionManager;
}
}
2.4持久层配置编写(MyBatis整合)
①准备外部配置文件
位置：resources/jdbc.properties
jdbc.user=root
jdbc.password=root
jdbc.url=jdbc:mysql:///mybatis-example
jdbc.driver=com.mysql.cj.jdbc.Driver
②数据库配置类（DataSourceJavaConfig.java）
@Configuration
@PropertySource("classpath:jdbc.properties")
public class DataSourceJavaConfig {
@Value("${jdbc.user}")
private String user;
@Value("${jdbc.password}")
private String password;
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.driver}")
private String driver;
//数据库连接池配置
@Bean
public DataSource dataSource(){
DruidDataSource dataSource = new DruidDataSource();
dataSource.setUsername(user);
dataSource.setPassword(password);
dataSource.setUrl(url);
dataSource.setDriverClassName(driver);
return dataSource;
}
}
③mapper配置类
/**
* projectName: com.atguigu.config
*
* description: 持久层配置和Druid和Mybatis配置 使用一个配置文件
*/
@Configuration
public class MapperJavaConfigNew {
/**
* 配置SqlSessionFactoryBean,指定连接池对象和外部配置文件即可
* @param dataSource 需要注入连接池对象
* @return 工厂Bean
*/
@Bean
public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
//实例化SqlSessionFactory工厂
SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
//设置连接池
sqlSessionFactoryBean.setDataSource(dataSource);
//TODO: 替代xml文件的java配置
/*
<settings>
<!-- 开启驼峰式映射-->
<setting name="mapUnderscoreToCamelCase" value="true"/>
<!-- 开启logback日志输出-->
<setting name="logImpl" value="SLF4J"/>
<!--开启resultMap自动映射 -->
<setting name="autoMappingBehavior" value="FULL"/>
</settings>
<typeAliases>
<!-- 给实体类起别名 -->
<package name="com.atguigu.pojo"/>
</typeAliases>
<plugins>
<plugin interceptor="com.github.pagehelper.PageInterceptor">
<!--
helperDialect：分页插件会自动检测当前的数据库链接，自动选择合适的分页方式。
你可以配置helperDialect属性来指定分页插件使用哪种方言。配置时，可以使用下面的缩写值：
oracle,mysql,mariadb,sqlite,hsqldb,postgresql,db2,sqlserver,informix,h2,sqlserver2012,derby
（完整内容看 PageAutoDialect） 特别注意：使用 SqlServer2012 数据库时，
https://github.com/pagehelper/Mybatis-PageHelper/blob/master/wikis/zh/HowToUse.md#%E5%A6%82%E4%BD%95%E9%85%8D%E7%BD%AE%E6%95%B0%E6%8D%AE%E5%BA%93%E6%96%B9%E8%A8%80
-->
<property name="helperDialect" value="mysql"/>
</plugin>
</plugins>
*/
//settings [包裹到一个configuration对象,切记别倒错包]
org.apache.ibatis.session.Configuration configuration = new org.apache.ibatis.session.Configuration();
configuration.setMapUnderscoreToCamelCase(true);
configuration.setLogImpl(Slf4jImpl.class);
configuration.setAutoMappingBehavior(AutoMappingBehavior.FULL);
sqlSessionFactoryBean.setConfiguration(configuration);
//typeAliases
sqlSessionFactoryBean.setTypeAliasesPackage("com.atguigu.pojo");
//分页插件配置
PageInterceptor pageInterceptor = new PageInterceptor();
Properties properties = new Properties();
properties.setProperty("helperDialect","mysql");
pageInterceptor.setProperties(properties);
sqlSessionFactoryBean.addPlugins(pageInterceptor);
return sqlSessionFactoryBean;
}
/**
* 配置Mapper实例扫描工厂,配置 <mapper <package 对应接口和mapperxml文件所在的包
* @return
*/
@Bean
public MapperScannerConfigurer mapperScannerConfigurer(){
MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();
//设置mapper接口和xml文件所在的共同包
mapperScannerConfigurer.setBasePackage("com.atguigu.mapper");
return mapperScannerConfigurer;
}
}
2.5容器初始化配置类
public class MyWebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {
//指定root容器对应的配置类
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class<?>[] {MapperJavaConfig.class, ServiceJavaConfig.class, DataSourceJavaConfig.class };
}
//指定web容器对应的配置类
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class<?>[] { WebJavaConfig.class };
}
//指定dispatcherServlet处理路径，通常为 /
@Override
protected String[] getServletMappings() {
return new String[] { "/" };
}
}
2.6整合测试
①查询所有员工信息,返回对应json数据！
②controller
@Slf4j
@RestController
@RequestMapping("/employee")
public class EmployeeController {
@Autowired
private EmployeeService employeeService;
@GetMapping("list")
public List<Employee> retList(){
List<Employee> employees = employeeService.findAll();
log.info("员工数据:{}",employees);
return employees;
}
}
③service
@Service
public class EmployeeServiceImpl implements EmployeeService {
@Autowired
private EmployeeMapper employeeMapper;
/**
* 查询所有员工信息
*/
@Override
public List<Employee> findAll() {
List<Employee> employeeList = employeeMapper.queryAll();
return employeeList;
}
}
④mapper
mapper接口 包：com.atguigu.mapper
public interface EmployeeMapper {
List<Employee> queryAll();
}
mapper XML 文件位置： resources/mappers
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!-- namespace等于mapper接口类的全限定名,这样实现对应 -->
<mapper namespace="com.atguigu.mapper.EmployeeMapper">
<select id="queryAll" resultType="employee">
<!-- #{empId}代表动态传入的参数,并且进行赋值!后面详细讲解 -->
select emp_id empId,emp_name empName, emp_salary empSalary from t_emp
</select>
</mapper>
3.跨域问题处理
/*
@CrossOrigin 注释在带注释的控制器方法上启用跨源请求
*/
@CrossOrigin
@RequestMapping("schedule")
@RestController
public class ScheduleController{
@Autowired
private ScheduleService scheduleService;
@GetMapping("/{pageSize}/{currentPage}")
public R showList(@PathVariable(name = "pageSize") int pageSize, @PathVariable(name = "currentPage") int currentPage){
PageBean<Schedule> pageBean = scheduleService.findByPage(pageSize,currentPage);
return R.ok(pageBean);
}
}
