springMVC框架学习-3

springMVC框架学习安排

第三天

SSM整合案例

整合步骤： &&表示整合

1. spring
2. springMVC
3. spring&&springMVC
4. mybatis
5. spring&&mybatis
6. SSM

1.spring框架搭建

1. 创建maven工程，选择骨架创建
   
   结束后为项目添加所需的目录

2. 项目目录结构
   

3. 添加所必须的代码

   1. 引入pom.xml坐标

    <properties>
       <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
       <maven.compiler.source>1.8</maven.compiler.source>
       <maven.compiler.target>1.8</maven.compiler.target>
       <spring.version>5.0.2.RELEASE</spring.version>
       <slf4j.version>1.6.6</slf4j.version>
       <log4j.version>1.2.12</log4j.version>
       <mysql.version>5.1.6</mysql.version>
       <mybatis.version>3.4.5</mybatis.version>
     </properties>
   
     <dependencies>
       <dependency>
         <groupId>org.aspectj</groupId>
         <artifactId>aspectjweaver</artifactId>
         <version>1.6.8</version>
       </dependency>
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-aop</artifactId>
         <version>${spring.version}</version>
       </dependency>
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-context</artifactId>
         <version>${spring.version}</version>
       </dependency>
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-web</artifactId>
         <version>${spring.version}</version>
       </dependency>
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-webmvc</artifactId>
         <version>${spring.version}</version>
       </dependency>
       <dependency>
         <groupId>org.springframework</groupId>
         <artifactId>spring-test</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>${spring.version}</version>
       </dependency>
       <dependency>
         <groupId>junit</groupId>
         <artifactId>junit</artifactId>
         <version>4.12</version>
         <scope>compile</scope>
       </dependency>
       <dependency>
         <groupId>mysql</groupId>
         <artifactId>mysql-connector-java</artifactId>
         <version>${mysql.version}</version>
       </dependency>
       <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>servlet-api</artifactId>
         <version>2.5</version>
         <scope>provided</scope>
       </dependency>
       <dependency>
         <groupId>javax.servlet.jsp</groupId>
         <artifactId>jsp-api</artifactId>
         <version>2.0</version>
         <scope>provided</scope>
       </dependency>
       <dependency>
         <groupId>jstl</groupId>
         <artifactId>jstl</artifactId>
         <version>1.2</version>
       </dependency>
       <!-- log start -->
       <dependency>
         <groupId>log4j</groupId>
         <artifactId>log4j</artifactId>
         <version>${log4j.version}</version>
       </dependency>
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-api</artifactId>
         <version>${slf4j.version}</version>
       </dependency>
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-log4j12</artifactId>
         <version>${slf4j.version}</version>
       </dependency>
       <!-- log end -->
       <dependency>
         <groupId>org.mybatis</groupId>
         <artifactId>mybatis</artifactId>
         <version>${mybatis.version}</version>
       </dependency>
   
       <dependency>
         <groupId>org.mybatis</groupId>
         <artifactId>mybatis-spring</artifactId>
         <version>1.3.0</version>
       </dependency>
       <dependency>
         <groupId>c3p0</groupId>
         <artifactId>c3p0</artifactId>
         <version>0.9.1.2</version>
         <type>jar</type>
         <scope>compile</scope>
       </dependency>
   
     </dependencies>
   
   

   2. dao

   @Repository("accountDao")
   public interface AccountDao {
   
       //查询所有用户
       public List<Account> findAll();
   
       //保存
       public void saveAccount(Account account);
   }
   
   

   2. service

   public interface AccountService {
   
       //查询所有用户
       public List<Account> findAll();
   
       //保存
       public void saveAccount(Account account);
   }
   

   @Service("accountService")
   public class AccountServiceImpl implements AccountService{
   
       @Override
       public List<Account> findAll() {
           System.out.println("业务层：findAll");
           return null;
       }
   
       @Override
       public void saveAccount(Account account) {
           System.out.println("业务层：saveAccount");
       }
   }
   

   3. controller

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

   4. 实体类

   public class Account implements Serializable {
       private Integer id;
       private String name;
       private Double money;
   
       public Integer getId() {
           return id;
       }
   
       public void setId(Integer id) {
           this.id = id;
       }
   
       public String getName() {
           return name;
       }
   
       public void setName(String name) {
           this.name = name;
       }
   
       public Double getMoney() {
           return money;
       }
   
       public void setMoney(Double money) {
           this.money = money;
       }
   
       @Override
       public String toString() {
           return "Account{" +
                   "id=" + id +
                   ", name='" + name + '\'' +
                   ", money=" + money +
                   '}';
       }
   }
   
   

   5. spring配置文件applicationContext.xml

   <?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:aop="http://www.springframework.org/schema/aop"
           xmlns:tx="http://www.springframework.org/schema/tx"
           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/aop
           http://www.springframework.org/schema/aop/spring-aop.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx.xsd">
       
       
       <!--配置创建IOC容器要扫描的包-->
       <context:component-scan base-package="com.liuzeyu">
           <!--不扫描配置注解Controller的类-->
           <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
       </context:component-scan>
   
   </beans>
   

   简单测试环境是否可以运行spring项目：

   public class SSMTest {
   
       @Test
       public void test01(){
           ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml");
           AccountService accountService = (AccountService) ac.getBean("accountService");
           accountService.findAll();
       }
   }
   

   测试结果：
   
   OK，spring项目搭建成功！

2.springMVC框架搭建

1. 新建springMVC环境配置文件

<?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:context="http://www.springframework.org/schema/context"
       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/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--配置扫描controller-->
    <context:component-scan base-package="com.liuzeyu">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>


    <!--配置视图解析器-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--对项目的静态资源放行-->
    <mvc:resources mapping="/js/**" location="/js/"/>
    <!--开启springMVC注解支持-->
    <mvc:annotation-driven/>
</beans>

2. web.xml的编写

<!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>

  <!--配置前端控制器-->
  <servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!--配置初始化参数，当DispatcherServlet创建完之后加载springmvc.xml-->
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <!--服务器启动时创建DispatcherServlet-->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!--解决请求中文乱码问题-->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
  </filter>

  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

3. controller的编写

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

    @RequestMapping("findAll")
    public String findAll(){
        System.out.println("查询所有被执行了");
        return "list";
    }
}

4. jsp的测试界面

index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>

<a href="/account/findAll">查询所有</a>
</body>
</html>

list.jsp

测试结果：

OK，springMVC环境也配置成功！

3.spring整合springMVC框架搭建

完成springMVC的环境搭建，我们发现一个问题，当服务器启动后，controller层无法去调用service的对象，注入无法成功，为什么呢？

    @Autowired
    private AccountService accountService;

因为spring的配置文件没有在服务器启动后被加载，查看web.xml文件：

它只会去加载springMVC的文件，把controller加入IOC容器中，dao和service并没有被加入IOC容器中。由此可见，我们想要整合springMVC就必须将spring的配置文件也要加载搭配spring的容器中
方案思路：

所以我们需要去监听servletContext的创建时机，如何监听？借助spring为我们提供的监听器，一旦servletContext创建成功，就可以加载spring文件
webx.xml的配置:

  <!--配置监听器，监听servletContext的创建-->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!--执行servletContext创建后要加载的文件-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>

测试结果：业务层被controller成功调用

4.MyBatis框架环境搭建

1. 配置dao到的接口方法，使用注解的方式插入sql语句

public interface AccountDao {

    //查询所有用户
    @Select("select * from account")
    public List<Account> findAll();

    //保存
    @Insert("insert into account (name,money)values(#{name},#{money})")
    public void saveAccount(Account account);
}

2. mybatis的主配置文件

<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

    <!--数据库主配置环境-->
    <environments default="mysql">
        <environment id="mysql">
            <transactionManager type="JDBC"></transactionManager>
            <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="809080"/>
            </dataSource>
        </environment>
    </environments>

    <!--接口的映射配置-->
    <mappers>
        <!--<mapper class="com.liuzeyu.dao.AccountDao"/>-->
        <!--加载dao下的所有接口-->
        <package name="com.liuzeyu.dao"/>
    </mappers>
</configuration>

3. 测试方法

public class MyBatisTest {

    /**
     * 查询方法
     * @throws IOException
     */
    @Test
    public void test01() throws IOException {
        //加载MyBatis主配置文件
        InputStream is = Resources.getResourceAsStream("SqlMapperConfig.xml");
        //创建SqlSessionFactory工厂
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
        //创建SqlSession对象,查询方法无需事务的支持
        SqlSession sqlSession = factory.openSession();
        //创建dao的代理对象
        AccountDao accountDao = sqlSession.getMapper(AccountDao.class);
        //执行方法
        List<Account> list = accountDao.findAll();
        //遍历
        for (Account account : list) {
            System.out.println(account);
        }
        //是否资源
        sqlSession.close();
        is.close();
    }

    /**
     * 查询方法
     * @throws IOException
     */
    @Test
    public void test02() throws IOException {
        //加载MyBatis主配置文件
        InputStream is = Resources.getResourceAsStream("SqlMapperConfig.xml");
        //创建SqlSessionFactory工厂
        SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(is);
        //创建SqlSession对象,并开启事务的自动提交
        SqlSession sqlSession = factory.openSession(true);
        //创建dao的代理对象
        AccountDao accountDao = sqlSession.getMapper(AccountDao.class);
        //执行方法
        Account account = new Account();
        account.setName("laowang");
        account.setMoney(5000.0);

        accountDao.saveAccount(account);
        //是否资源
        sqlSession.close();
        is.close();
    }
}

4. 测试结果
   保存方法：
   
   查询方法：
   

4.spring整合MyBatis框架

同样遇到问题：我们service如何得到dao的接口对象呢？
分析：
当服务器启动后，tomcat服务器加载springMVC配置文件，监听器加载spring配置文件，虽然可以将dao的接口对象加入到IOC容器中，但是由于没有实现类，故我们在myabatis中是使用的代理dao的方式执行dao层的方法。
解决方案：
出发点如何将代理dao加入到IOC容器中？
步骤：在spring的配置文件中

1. 配置连接池

2. 配置SqlSessionFactory

3. 配置创建AccountDao所在的包
   
   这样就可以创建出代理的dao对象并存入容器中。此时mybatis的主配置文件就可以删除掉了
   
   因为我们已经将mybatis的环境整合到了spring中。

4. 为AccountDao加上注解

   @Repository("accountDao")
   

5. service层实现类调用dao层方法

   @Service("accountService")
   public class AccountServiceImpl implements AccountService{
   
       @Autowired
       private AccountDao accountDao;
   
       @Override
       public List<Account> findAll() {
           System.out.println("业务层：findAll");
           return accountDao.findAll();
       }
   
       @Override
       public void saveAccount(Account account) {
           accountDao.saveAccount(account);
           System.out.println("业务层：saveAccount");
       }
   }
   

6. controller调用service方法并且返回前端

   @Controller
   @RequestMapping("/account")
   public class AccountController {
   
       @Autowired
       private AccountService accountService;
   
       @RequestMapping("findAll")
       public String findAll(Model model){
           List<Account> list = accountService.findAll();
           model.addAttribute("list",list);
           System.out.println("查询所有被执行了");
           return "list";
       }
   }
   

7. 前端解析遍历结果

   <%@ 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>
   
   <h2>查询到所有</h2>
   <c:forEach items="${list}" var="account">
       ${account.name}
   </c:forEach>
   </body>
   </html>
   

8. 测试结果
   

5.添加spring的事务控制器

1. 配置spring的声明式事务管理

 <!--配置spring框架的声明式事务管理-->
    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--配置事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <!--查询方法只读-->
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*" isolation="DEFAULT"/>
        </tx:attributes>
    </tx:advice>
    <!--配置AOP增强-->
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(* com.liuzeyu.service.impl.*.*(..))"/>
    </aop:config>

2. 为controller添加保存方法

    @RequestMapping("save")
    public void save(Account account, HttpServletRequest request,
                       HttpServletResponse response) throws IOException {
        accountService.saveAccount(account);
        response.sendRedirect(request.getContextPath()+"/account/findAll");
        System.out.println("保存被执行了---AccountController");
        return;
    }

测试结果：