SSM整合（代码和视频讲解）

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SSM整合

SSM包括 MyBatis、Spring、SpringMVC关于SSM的小项目demo在我的码云仓库码云SSM仓库代码

整合步骤

1. 准备数据库和表记录 
2. 创建web项目 
3. 编写mybatis在ssm环境中可以单独使用 
4. 编写spring在ssm环境中可以单独使用 
5. spring整合mybatis 
6. 编写springMVC在ssm环境中可以单独使用 
7. spring整合springMVC

部分步骤没有详细代码，可以在我仓库里找到

创建web项目

  • 创建maven项目，pom.xml 加 <packaging>war</packaging>
  • main目录下创建webapp目录

  • 补全webapp目录内容 （把创建的WEB-INF目录放在webapp目录下）


配置MyBatis单独运行

  • 导入mybatis和MySQL驱动依赖
        <!--mybatis坐标-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.15</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.1</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
  • 创建domain包，里面放与数据库表对应的JavaBean
  • main目录下创建mapper包，里面放xxxMapper接口
  • resources目录下创建MyBatis配置文件 SqlMapConfig.xml
  • 创建jdbc.properties文件存放数据库连接信息
  • 创建测试类
    @Test
    public void test() throws IOException {
        InputStream is = Resources.getResourceAsStream("SqlMapConfig.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(is);
        SqlSession sqlSession = sqlSessionFactory.openSession();
        DeptMapper mapper = sqlSession.getMapper(DeptMapper.class);
        List<Dept> all = mapper.findAll();
        for (Dept dept : all) {
            System.out.println(dept);
        }
    }

配置Spring单独运行

  • 导入Spring依赖
        <!--spring坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.13</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
  • service包下创建xxxService 和 xxxServiceImpl 实现类要加@Servicec注解
  • resources目录下配置spring配置文件 applicationContext.xml
    <!--包扫描-->
    <context:component-scan base-package="com.lagou.service"/>
    <!--配置数据库连接信息-->
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <!--注册数据源对象-->
    <bean class="com.alibaba.druid.pool.DruidDataSource" id="dataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

MyBatis和Spring整合

  • 导入整合依赖
        <!--mybatis整合spring坐标-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
  • spring配置文件中配置整合需要的类 SqlSessionFactoryBean 、MapperScannerConfigurer
     <!--注册mybatis整合spring所需要的对象-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="factoryBean">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!--注册MapperScannerConfigurer 相当于mybatis配置中<mappers>标签的作用-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer" id="mapperScannerConfigurer">
        <property name="basePackage" value="com.lagou.mapper"></property>
    </bean>
  • 编写测试类
//注解开启spring和JunitTest整合
@RunWith(SpringJUnit4ClassRunner.class)
//读取spring配置文件内容
@ContextConfiguration("classpath:applicationContext.xml")
public class TestSpring {
    @Autowired
    EmployeeService employeeService;

    @Test
    public void test() {
        List<Employee> all = employeeService.findAll();
        for (Employee employee : all) {
            System.out.println(employee);
        }
    }

}

编写SpringMVC单独运行

  • 导入SpringMVC依赖
        <!--springMVC坐标-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--json读写依赖-->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.8</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.0</version>
        </dependency>
  • 在web.xml配置 核心控制器 DispatcherServlet 、配置CharacterEncodingFilter解决POST请求中文乱码、spring配置文件加载
    <!--核心控制器-->
    <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-config.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!--监听项目启动，加载spring配置文件-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <!--解决POST请求中文乱码-->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
  • webapp目录下添加success.jsp
  • 在controller包编写xxxController 加上@Controller注解
    @RequestMapping("/quick")
    public String quick() {
      //物理视图，会调用视图解析器拼接成 /success.jsp
        return "success";
    }
  • 编写SpringMVC配置文件
    <!--扫描指定包-->
    <context:component-scan base-package="com.lagou.controller"/>
    <!--处理器映射器和处理器适配器功能增强，自定义转换器，启动json读写功能-->
    <mvc:annotation-driven/>
    <!--配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <property name="prefix" value="/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--放行静态资源,如JS-->
    <mvc:default-servlet-handler/>
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