ssm整合

作者: EvanPoison | 来源:发表于2019-04-02 17:47 被阅读0次

    SSM整合笔记

    整合Spring

    1. 编写xml配置文件,开启注解扫描(指定Controller注解不扫描)

       <!--开启注解扫描,只处理service和dao,controller不需要Spring框架处理-->
           <context:component-scan base-package="cn.itcast">
           <!--配置哪些不扫描-->
           <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
           </context:component-scan>
      
    2. 在业务层的实现类上编写Spring注解,如:

       @Service("accountService")
       public class AccountServiceImpl implements AccountService
      
    3. Spring整合完成,测试一下(非必须):

       @Test
           public void run1(){
               ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
               AccountService as = (AccountService) ac.getBean("accountService");
               as.findAll();
           }
      

    整合SpringMVC

    1. 在web.xml中配置前端控制器和中文乱码过滤器

       <!--配置前端控制器-->
         <servlet>
           <servlet-name>dispatcherServlet</servlet-name>
           <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
           <!--加载springmvc.xml配置文件-->
           <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath:springmvc.xml</param-value>
           </init-param>
      
           <!--启动服务器,创建servlet-->
           <load-on-startup>1</load-on-startup>
         </servlet>
         
         <servlet-mapping>
           <servlet-name>dispatcherServlet</servlet-name>
           <url-pattern>/</url-pattern>
         </servlet-mapping>
         
         <!--解决中文乱码的过滤器-->
         <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>
      
    2. 编写springmvc.xml配置文件,内容包括

       1. 开启注解扫描,只扫描Controller注解
       2. 配置视图解析器对象
       3. 过滤静态资源
       4. 开启SpringMVC注解的支持
      
       <!--开启注解扫描,只扫描Controller注解-->
       <context:component-scan base-package="cn.itcast">
           <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
       </context:component-scan>
       <!--配置视图解析器对象-->
       <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
          <property name="prefix" value="/WEB-INF/pages/"/>
           <property name="suffix" value=".jsp"/>
       </bean>
       <!--过滤静态资源-->
       <mvc:resources mapping="/css/**" location="/css/"/>
       <mvc:resources mapping="/images/**" location="/images/"/>
       <mvc:resources mapping="/js/**" location="/js/"/>
       <!--开启SpringMVC注解的支持-->
       <mvc:annotation-driven/>
      
    3. 编写web层业务逻辑

       @Controller
       @RequestMapping("/account")
       public class AccountController {
      
           @RequestMapping("/findAll")
           public String findAll(){
               System.out.println("表现层:查询所有账户》。。");
               return "list";
           }
       }
       //在index.xml中跳转进行测试:<a href="account/findAll">测试</a>
      

    Spring和SpringMVC两者的整合

    》我们知道,在web.xml中前端控制器中加载了spingmvc.xml,但是spring的配置文件还没有加载
    》所以,需要在web.xml中配置Spring监听器,去加载applicationContext.xml

    1. 在web.xml配置文件中配置Spring的监听器:

       <!--配置Spring的监听器,默认只加载WEB-INF目录下的applicationContext.xml配置文件,通过context-param配置正确的路径-->
       <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>
      
    2. 在web层通过依赖注入,将service层对象注入:

       @Controller
       @RequestMapping("/account")
       public class AccountController {
      
           @Autowired
           private AccountService accountService;  //依赖注入
      
           @RequestMapping("/findAll")
           public String findAll(){
               System.out.println("表现层:查询所有账户》。。");
               //调用service层方法
               accountService.findAll();
               return "list";
           }
       }
      

    mybatis

    1. 使用注解编写dao层接口的sql语句

       public interface AccountDao {
           //查询所有
           @Select("select * from account")
           List<Account> findAll();
           //保存账户信息
           @Insert("insert into account (name,money) values (#{name},#{money})")
           void saveAccount(Account account);
       }
      
    2. 编写SqlMapConfig.xml配置文件

       <?xml version="1.0" encoding="UTF-8"?>
       <!DOCTYPE configuration
               PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
               "http://mybatis.org/dtd/mybatis-3-config.dtd">
      
       <configuration>
           <!--配置环境-->
           <environments default="mysql">
               <environment id="mysql">
                   <transactionManager type="JDBC"/>
                   <dataSource type="POOLED">
                       <property name="driver" value="com.mysql.jdbc.Driver"/>
                       <property name="url" value="jdbc:mysql://localhost:3306/ssm"/>
                       <property name="username" value="root"/>
                       <property name="password" value="root"/>
                   </dataSource>
               </environment>
           </environments>
           <!--引入映射配置文件,这里没有配置文件,使用dao类路径-->
           <mappers>
               <!--<mapper resource="xxx.xml"/> 资源配置文件-->
               <!--<mapper class="cn.itcast.dao.AccountDao"/> 单独指定某个类文件-->
               <!--使用package指定包名,包里所有的接口都会被扫描到-->
               <package name="cn.itcast.dao"/>
           </mappers>
       </configuration>
      
    3. 编写测试类(非必须)

       public class TestMybatis {
           @Test
           public void testMybatis() throws Exception {
               //加载配置文件
               InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
               //创建SqlSessionFactory对象
               SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(in);
               //创建SqlSession对象
               SqlSession sqlSession = factory.openSession();
               //获取代理对象
               AccountDao dao = sqlSession.getMapper(AccountDao.class);
               //查询所有数据
               List<Account> list = dao.findAll();
               for (Account account : list) {
                   System.out.println(account);
               }
               //关闭资源
               sqlSession.close();
               in.close();
           }
       }
      

    整合mybatis

    思路:现在需要将获取到的代理对象,存入容器中,在service中获取到dao层的代理对象,调用dao层代理对象的方法,如何操作呢?
    答案:在业务层service的配置文件applicationContext.xml中配置

    1. 编写applicationContext.xml配置文件:

       <?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:aop="http://www.springframework.org/schema/aop"
              xmlns:tx="http://www.springframework.org/schema/tx"
              xmlns:context="http://www.springframework.org/schema/context"
              xsi:schemaLocation="http://www.springframework.org/schema/beans
               http://www.springframework.org/schema/beans/spring-beans.xsd
               http://www.springframework.org/schema/tx
               http://www.springframework.org/schema/tx/spring-tx.xsd
               http://www.springframework.org/schema/aop
               http://www.springframework.org/schema/aop/spring-aop.xsd
               http://www.springframework.org/schema/context
               http://www.springframework.org/schema/context/spring-context.xsd">
      
           <!--开启注解扫描,只处理service和dao,controller不需要Spring框架处理-->
           <context:component-scan base-package="cn.itcast">
               <!--配置哪些不扫描-->
               <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
           </context:component-scan>
      
      
           <!--整合mybatis框架-->
           <!--配置连接池-->
           <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
               <property name="driverClass" value="com.mysql.jdbc.Driver"/>
               <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/ssm"/>
               <property name="user" value="root"/>
               <property name="password" value="root"/>
           </bean>
           <!--配置SqlSessionFactory工厂-->
           <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
               <!--配置连接池-->
               <property name="dataSource" ref="dataSource"/>
           </bean>
           <!--配置AccountDao接口所在的包-->
           <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
               <property name="basePackage" value="cn.itcast.dao"/>
           </bean>
       </beans>
      
    2. 此时,之前编写的SqlMapConfig.xml就没有用处了,可以删掉

    3. 在service层注入dao代理对象

       @Service("accountService")
       public class AccountServiceImpl implements AccountService {
      
           @Autowired
           private AccountDao accountDao; //注入代理对象
      
           @Override
           public List<Account> findAll() {
               System.out.println("业务层:查询所有账户信息...");
               return accountDao.findAll();
           }
      
           @Override
           public void saveAccount(Account account) {
               System.out.println("业务层:保存账户");
               accountDao.saveAccount(account);
               //这里没有添加事务,并不会真的保存到数据库
           }
       }
      
    4. 整合完成,此时我们在web层可以将数据,转发到页面中去(通过Model)

       @Controller
       @RequestMapping("/account")
       public class AccountController {
      
           @Autowired
           private AccountService accountService;
      
           @RequestMapping("/findAll")
           public String findAll(Model model){
               System.out.println("表现层:查询所有账户》。。");
               //调用service层方法
               List<Account> list = accountService.findAll();
               model.addAttribute("list",list);
               return "list";
           }
       }
       
       //页面展示代码
       <%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
       <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
       <html>
       <head>
           <title>Title</title>
       </head>
       <body>
           <h3>查询所有账户...</h3>
           <%--${list}--%>
           <c:forEach items="${list}" var="account">
               ${account.name}
           </c:forEach>
       </body>
       </html>
      

    整合mybatis框架-事务管理

    1. 在applicationContext.xml中配置事务管理

       <!--配置Spring框架声明式事务管理-->
       <!--1. 配置事务管理器-->
       <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
           <property name="dataSource" ref="dataSource"/>
       </bean>
       <!--2. 配置事务通知-->
       <tx:advice id="txAdvice" transaction-manager="transactionManager">
           <tx:attributes>
               <tx:method name="find*" read-only="true"/>
               <tx:method name="*" isolation="DEFAULT"/>
           </tx:attributes>
       </tx:advice>
       <!--3. 配置AOP增强-->
       <aop:config>
           <aop:advisor advice-ref="txAdvice" pointcut="execution(* cn.itcast.service.impl.*ServiceImpl.*(..))"/>
       </aop:config>
       
       
       //测试 前端页面
       <h3>测试保存(事务管理)</h3>
       <form action="account/saveAccount" method="post">
           姓名:<input type="text" name="name"/><br/>
           金额:<input type="text" name="money"/><br/>
           <input type="submit" value="保存"/><br/>
       </form>
       
       //web层
       @RequestMapping("/saveAccount")
       public void saveAccount(Account account, HttpServletRequest request, HttpServletResponse response) throws IOException {
           System.out.println("表现层:保存账户》。。");
           //调用service层方法
          accountService.saveAccount(account);
          response.sendRedirect(request.getContextPath()+"/account/findAll"); //重定向
           return;
       }
      

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