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SSM整合

整合策略

  • 先Spring + Mybatis
  • 再整合Spring mvc

示例需求：查询user表全部数据并展示的页面

1. Spring + Mybatis

  • 整合目标

    • 数据库连接池及事务管理器都交给Spring容器完成
    • SqlSessionFactory对象放到Spring容器中，作为单例对象管理
    • Mapper动态代理对象交给Spring管理，我们从容器中直接获得Mapper代理对象

  • 整合所需依赖

    • junit
    • mybatis
    • Spring(spring-context,spring-test,spring-jdbc,spring-tx,spring-aop,aspectjweaver)
    • Mybatis-spring-**.jar
    • mysql驱动
    • Druid数据库连接池

  • pom

    看示例代码 ssm-demo https://gitee.com/ixinglan/spring-demo.git

2.整合Srpign MVC

  • pom

    <dependencies>
<!--        junit-->
<!--        mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>

<!--        spring, 父pom中有的，这里不重复添加-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.12.RELEASE</version>
        </dependency>

<!--        mybatis-spring-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.3</version>
        </dependency>

<!--        mysql-connector-java-->
<!--        druid-->

<!--        spring webmvc-->
<!--        servlet-api-->
<!--        jsp-api-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
        </dependency>

<!--        jstl表达式-->
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>

<!--        jackson-core-->
<!--        jackson-databind-->
<!--        jackson-annotations-->
    </dependencies>

  • controller

    @Controller
@RequestMapping("/account")
public class AccountController {

    /**
     * Spring容器和SpringMVC容器是有层次的（父子容器）
     * Spring容器：service对象+dao对象
     * SpringMVC容器：controller对象，，，，可以引用到Spring容器中的对象
     */


    @Autowired
    private AccountService accountService;

    @RequestMapping("/queryAll")
    @ResponseBody
    public List<Account>  queryAll() throws Exception {
        return accountService.queryAccountList();
    }

}

  • springmvc.sml

    <?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="
       http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.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
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
">
    <context:component-scan base-package="org.ssm.demo.controller"/>

    <!--配置springmvc注解驱动，自动注册合适的组件handlerMapping和handlerAdapter-->
    <mvc:annotation-driven/>
</beans>

  • web.xml

    <?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <display-name>ssm demo</display-name>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:applicationContext*.xml</param-value>
    </context-param>
<!--    spring框架启动-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

<!--    springmvc启动-->
    <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*:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>
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