Spring框架（五）——SSM整合

一、概述

SSM框架，即Spring+SpringMVC+Mybatis；
说是三个框架整合，其实SpringMVC属于Spring的一部分，所以实际上SSM是Spring框架和MyBatis框架的整合；
这个框架常作为数据源较简单的web项目的框架。

二、环境准备

2.1 导入依赖包

<!-- 集中定义依赖版本号 -->
	<properties>
		<spring.version>5.1.9.RELEASE</spring.version>
		<junit.version>4.9</junit.version>
		<mybatis.version>3.5.2</mybatis.version>
		<mysql.version>5.1.22</mysql.version>
		<mybatis-spring.version>2.0.2</mybatis-spring.version>
		<servlet.version>3.1.0</servlet.version>
		<commons.fileupload.version>1.3.1</commons.fileupload.version>
		<commons.io.version>1.3.2</commons.io.version>
		<jackson.version>2.9.9</jackson.version>
	</properties>

	<!-- 配置依赖关系 -->
	<dependencies>
		<dependency>
		<groupId>javax.servlet.jsp</groupId>
		<artifactId>jsp-api</artifactId>
		<version>2.1</version>
		<scope>provided</scope>
	</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<!-- 整合MyBatis依赖的jar包 -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>${mybatis.version}</version>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>${mysql.version}</version>
		</dependency>
		<!-- MyBatis和Spring整合所依赖的jar包 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>${spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>${mybatis-spring.version}</version>
		</dependency>
		<!-- 单元测试 -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>javax.servlet-api</artifactId>
			<version>${servlet.version}</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>${commons.fileupload.version}</version>
		</dependency>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>${commons.io.version}</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-annotations</artifactId>
			<version>${jackson.version}</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-core</artifactId>
			<version>${jackson.version}</version>
		</dependency>
		<dependency>
			<groupId>com.fasterxml.jackson.core</groupId>
			<artifactId>jackson-databind</artifactId>
			<version>${jackson.version}</version>
		</dependency>
	</dependencies>

2.2 创建Spring配置文件

在resource下创建Spring的配置文件application.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
      					 http://www.springframework.org/schema/beans/spring-beans.xsd
      					 http://www.springframework.org/schema/mvc
      					 http://www.springframework.org/schema/mvc/spring-mvc.xsd
      					 http://www.springframework.org/schema/context
      					 http://www.springframework.org/schema/context/spring-context.xsd
                         http://www.springframework.org/schema/tx
                         http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- 启动注解功能 -->
    <mvc:annotation-driven/>
    <!-- 启用包扫描功能 -->
    <context:component-scan base-package="要扫描的包" />

    <!--配置数据源-->
    <bean id="dataSource"
          class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <!--jdbc驱动-->
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <!--mysql连接路径-->
        <property name="url" value="jdbc:mysql://localhost:3306/test"></property>
        <!--用户名-->
        <property name="username" value="root"></property>
        <!--密码-->
        <property name="password" value="root"></property>
    </bean>
    <!--配置sqlSessionFactory-->
    <bean name="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!--Mapper扫描器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <property name="basePackage" value="mapper包路径"/>
    </bean>

    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- 开启事务注解功能 -->
    <tx:annotation-driven transaction-manager="transactionManager"/>
    <!--视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

2.3 配置web.xml

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <!-- 指定Spring配置文件路径 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>

  <!-- 加载Spring容器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

 
  <!-- 配置Spring的核心控制器 -->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

三、测试

下面以页面发起请求获取数据库中user表的数据为例；

3.1 实体类

@Component
public class User {
    private String id;
    private String name;

    //省略set和get方法

3.2 Dao类

@Repository
public interface UserMapper {
    @Select("select * from user")
    public List<User> find();
}

3.3 Service类

@Service
public class UserService {
    @Autowired
    UserMapper userMapper;

    public void find(){
        System.out.println("进入到服务中");
        List<User> users= userMapper.find();
        System.out.println(users);
    }

}

3.4 Controller类

@Controller
@RequestMapping("/user")
public class UserController {
    @Autowired
    UserService userService;


    @RequestMapping("/find")
    public String find(){
        userService.find();
        return "user";
    }
}

启动服务器，访问路径http://localhost:8080/user/find,运行后台没有出现错误，并将user表的数据打印出来，代表整合成功。