知识

SpringMVC: End

张天宇 on 2020-04-22

SpringMVC第三篇，SSM的整合。

环境搭建

数据库的准备

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create database ssm;
use ssm;
create table account(
    id int primary key auto_increment,
    name varchar(20),
    money double
);

导入坐标

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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>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <!-- spring -->
    <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>

代码准备

  1. 实体类

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    public class Account implements Serializable {
        private Integer id;
        private String name;
        private Double money;
        //getter & setter
    }

  2. 持久层

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    public interface IAccountDao {
        public List<Account> findAll();
        public void saveAccount(Account account);
    }

  3. 业务层

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    public interface IAccountService {
        public List<Account> findAll();
        public void saveAccount(Account account);
    }
    public class AccountService implements IAccountService {
        @Override
        public List<Account> findAll() {
            System.out.println("业务层：输出所有");
            return null;
        }

        @Override
        public void saveAccount(Account account) {
            System.out.println("业务层：保存了");
        }
    }

  4. 控制器

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    public class AccountController {
    }

Spring搭建

  1. 编写Spring配置文件applicationContext.xml，并导入依赖。

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    <?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">
        <!-- 开启扫描，只处理Service和Dao，Controller交给SpringMVC处理 -->
        <context:component-scan base-package="top.tyzhang">
            <!-- 配置哪些不扫描 -->
            <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        </context:component-scan>
    </beans>

  2. 使用注解配置业务层。

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    @Service("accountService")
    public class AccountService implements IAccountService {
        @Override
        public List<Account> findAll() {
            System.out.println("业务层：输出所有");
            return null;
        }
        //...
    }

  3. 测试Spring是否能独立运行。

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    //加载Spring配置文件
    ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
    AccountService as = (AccountService) applicationContext.getBean("accountService");
    as.findAll();

Spring整合SpringMVC

SpringMVC搭建

  1. 配置web.xml

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    <!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>
    <!--  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，创建该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>
    </web-app>

  2. 创建springmvc.xml的配置文件，编写配置文件。

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    <?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: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">
    	<!--    开启注解扫描，只扫描Controller-->
        <context:component-scan base-package="top.tyzhang">
            <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>
    	<!--    过滤静态资源-->
        <mvc:resources location="/css/" mapping="/css/**" />
        <mvc:resources location="/images/" mapping="/images/**" />
        <mvc:resources location="/js/" mapping="/js/**" />
    	<!--    开启注解的支持-->
        <mvc:annotation-driven/>
    </beans>

  3. 创建控制器类

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    @Controller
    @RequestMapping("/account")
    public class AccountController {
        @RequestMapping("/findAll")
        public String findAll(){
            System.out.println("表现层：查询所有信息");
            return "list";
        }
    }

  4. 配置相应JSP文件，启动服务器测试。

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

整合

  1. 配置监听器实现启动服务创建容器。

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    <!-- 配置 spring 提供的监听器，用于启动服务时加载容器 。
    该间监听器只能加载 WEB-INF 目录中名称为 applicationContext.xml 的配置文件 -->
    <listener>
        <listener-class>
        org.springframework.web.context.ContextLoaderListener
        </listener-class>
    </listener>
    <!-- 手动指定 spring 配置文件位置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

  2. 依赖注入

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    @Controller
    @RequestMapping("/account")
    public class AccountController {
        @Autowired
        private AccountService accountService;
        @RequestMapping("/findAll")
        public String findAll(){
            System.out.println("表现层：查询所有信息");
            accountService.findAll();
            return "list";
        }
    }

Spring整合MyBatis

搭建测试MyBatis环境

  1. 配置文件SqlMapConfig.xml。

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    <?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>
        <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:///ssm"/>
                    <property name="username" value="root"/>
                    <property name="password" value="root"/>
                </dataSource>
            </environment>
        </environments>
        <!-- 使用的是注解 -->
        <mappers>
            <!-- <mapper class="top.tyzhang.dao.IAccountDao"/> -->
            <!-- 该包下所有的dao接口都可以使用 -->
            <package name="top.tyzhang.dao"/>
        </mappers>
    </configuration>

  2. Dao中编写SQL语句。

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    public interface IAccountDao {
        @Select("select * from account")
        public List<Account> findAll();
        @Insert("insert into account (name, money) values (#{name}, #{money})")
        public void saveAccount(Account account);
    }

  3. 测试。

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    public class MyBaTest {
        @Test
        public void run() throws IOException {
            //加载mybatis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 session = factory.openSession();
            //获取代理对象
            IAccountDao accountDao=session.getMapper(IAccountDao.class);
            System.out.println(accountDao.findAll().size());
            session.close();
            in.close();
        }
        @Test
        public void run2() throws IOException {
            Account account = new Account();
            account.setName("lala");
            account.setMoney(14.0);
            //加载mybatis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 session = factory.openSession();
            //获取代理对象
            IAccountDao accountDao=session.getMapper(IAccountDao.class);
            accountDao.saveAccount(account);
            //提交事务
            session.commit();
            System.out.println(accountDao.findAll().size());
            session.close();
            in.close();
        }
    }

整合

  1. 把SqlMapConfig.xml配置文件中的内容配置到applicationContext.xml配置文件中并删除。

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    <?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">
        <!-- 开启扫描，只处理Service和Dao，Controller交给SpringMVC处理 -->
        <context:component-scan base-package="top.tyzhang">
            <!-- 配置哪些不扫描 -->
            <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
        </context:component-scan>

    	<!--    spring整合mybatis框架，就是把mybatis的配置文件交给spring-->
    	<!--    配置连接池-->
        <bean id="dSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
            <property name="driverClass" value="com.mysql.jdbc.Driver"/>
            <property name="jdbcUrl" value="jdbc:mysql:///ssm"/>
            <property name="user" value="root"/>
            <property name="password" value="root"/>
        </bean>
    	<!--    配置工厂对象SqlSessionFactory-->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dSource"/>
        </bean>
    	<!--    配置接口所在的包-->
        <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <property name="basePackage" value="top.tyzhang.dao"/>
        </bean>
    </beans>

  2. 在IAccountDao接口中添加@Repository注解。

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    @Repository
    public interface IAccountDao {
        @Select("select * from account")
        public List<Account> findAll();
        @Insert("insert into account (name, money) values (#{name}, #{money})")
        public void saveAccount(Account account);
    }

  3. 在Service中注入Dao对象。

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    @Service("accountService")
    public class AccountService implements IAccountService {
        @Autowired
        private IAccountDao iAccountDao;
        @Override
        public List<Account> findAll() {
            System.out.println("业务层：输出所有");
            return iAccountDao.findAll();
        }

        @Override
        public void saveAccount(Account account) {
            System.out.println("业务层：保存了");
            iAccountDao.saveAccount(account);
        }
    }

  4. Controller中注入Service。

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    @Controller
    @RequestMapping("/account")
    public class AccountController {
        @Autowired
        private AccountService accountService;
        @RequestMapping("/findAll")
        public String findAll(Model model){
            System.out.println("表现层：查询所有信息");
            List<Account> accountList = accountService.findAll();
            model.addAttribute("list",accountList);
            return "list";
        }
    }

  5. 截止到现在，增删查还没有提交事务的操作，需要在applicationContext.xml进行声明式事务管理。

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    <!--    配置声明式事务管理-->
    <!--配置事务管理器    -->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dSource"/>
        </bean>
    <!--    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>
    <!--    配置AOP增强-->
        <aop:config>
            <aop:advisor advice-ref="txAdvice" pointcut="execution(* top.tyzhang.service.impl.*Service.*(..))"/>
        </aop:config>

  6. 控制器

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    @RequestMapping("/save")
    public void save(Account account, HttpServletRequest request, HttpServletResponse response) throws IOException {
    	System.out.println("表现层：保存");
        accountService.saveAccount(account);
        response.sendRedirect(request.getContextPath()+"/user/findAll");
        return;
    }



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