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Spring + SpringMVC+ MyBatis(SSM)

Spring + SpringMVC+ MyBatis(SSM)

作者: 阿杰_96c5 | 来源:发表于2020-04-08 20:17 被阅读0次

    SSM 整合笔记

    1 环境准备

    1.1 创建数据库和表结构

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

    1.2 创建 Maven 工程

    1.3 导入坐标

    <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>
    
      <!--jar包版本锁定-->
      <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>
      <!-- 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>
    

    1.4 编写实体类

    /**
     * 账户实体类
     */
    public class Account implements Serializable {
    
        private int id;
        private String name;
        private Double money;
    
        public int getId() {
            return id;
        }
    
        public void setId(int 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 +
                    '}';
        }
    }
    

    1.5 编写业务层接口

    /**
     * 账户service接口
     */
    public interface AccountService {
    
        // 查询所有账号信息
        public List<Account> findAll();
    
        // 保存账户信息
        public void saveAccount(Account account);
    
    }
    
    /**
     * 账户service接口实现类
     */
    @Service("accountService")
    public class AccountServiceImpl implements AccountService {
    
        @Autowired
        AccountDao accountDao;
    
        @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: 保存账户信息..");
            accountDao.saveAccount(account);
        }
    }
    

    1.6 编写持久层接口

    /**
     * 账户dao接口
     */
    @Repository
    public interface AccountDao {
    
        // 查询所有账号信息
        @Select("select * from account")
        public List<Account> findAll();
    
        // 保存账户信息
        @Insert("insert into account(name,money) values(#{name},#{money})")
        public void saveAccount(Account account);
    }
    

    1.2 整合步骤

    2.1 Spring框架代码的编写

    2.1.1 第一步:编写 spring 配置文件并导入约束

    在ssm_web项目中创建applicationContext.xml的配置文件,编写具体的配置信息

    <?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">
    
        <!-- 开启注解扫描,要扫描的是service和dao层的注解,要忽略web层注解,因为web层让SpringMVC框架
    去管理 -->
        <context:component-scan base-package="org.example">
            <!-- 配置要忽略的注解 -->
            <context:exclude-filter type="annotation"
                                    expression="org.springframework.stereotype.Controller"/>
        </context:component-scan>
                
    
    </beans>
    

    2.1.1 编写测试方法,进行测试

    public class TestSpring {
    
        @Test
        public void run1(){
            // 加载配置方法
            ApplicationContext ac = new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
            // 获取对象
            AccountService accountService = (AccountService)ac.getBean("accountService");
            // 调用方法
            accountService.findAll();
    
        }
    }
    

    2.2 搭建和测试SpringMVC的开发环境

    2.2.1 在 web.xml 中配 置核心控制器(DispatcherServlet)

    <!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>
    
    
      <!-- 配置前端控制器:服务器启动必须加载,需要加载springmvc.xml配置文件 -->
      <servlet>
        <servlet-name>dispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 配置初始化参数,创建完DispatcherServlet对象,加载springmvc.xml配置文件 -->
        <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <!-- 服务器启动的时候,让DispatcherServlet对象创建 -->
        <load-on-startup>1</load-on-startup>
      </servlet>
    
      <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
      </servlet-mapping>
    
    </web-app>
    

    2.2.2 编写 SpringMVC 的配置文件

    <?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">
    
        <!-- 扫描controller的注解,别的不扫描 -->
        <context:component-scan base-package="org.example">
            <context:include-filter type="annotation"
                                    expression="org.springframework.stereotype.Controller"/>
        </context:component-scan>
    
        <!-- 配置视图解析器 -->
        <bean id="viewResolver"
              class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <!-- JSP文件所在的目录 -->
            <property name="prefix" value="/WEB-INF/pages/" />
            <!-- 文件的后缀名 -->
            <property name="suffix" value=".jsp" />
        </bean>
    
        <!-- 设置静态资源不过滤 -->
        <mvc:resources location="/css/" mapping="/css/**" />
        <mvc:resources location="/images/" mapping="/images/**" />
        <mvc:resources location="/js/" mapping="/js/**" />
    
        <!-- 开启对SpringMVC注解的支持 -->
        <mvc:annotation-driven />
    </beans>
    

    2.2.3 编写 Controller 和 jsp

    jsp 代码

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <a href="account/findAll">测试</a><br/>
    </body>
    </html>
    

    控制器代码:

    @Override
    public List<Account> findAll() {
        System.out.println("业务层: 查询所有账户信息..");
    
        return "null"
    }
    

    2.3 整合 Spring 和 和 SpringMVC

    2.3.1 在web.xml中配置监听器实现启动服务创建容器

    <!-- 配置加载类路径的配置文件 -->
    <context-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    
      <!-- 配置Spring的监听器 -->
      <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
      </listener>
    

    2.4 搭建和测试MyBatis的环境

    2.4.1 在web项目中编写SqlMapConfig.xml的配置文件,编写核心配置文件

    <?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>
        <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?useUnicode=true&amp;characterEncoding=UTF-8"/>
                    <property name="username" value="root"/>
                    <property name="password" value="root"/>
                </dataSource>
            </environment>
        </environments>
    
        <!-- 引入配置文件 -->
        <mappers>
            <!-- <mapper class="cn.itcast.dao.AccountDao"/> -->
            <!-- 该包下所有的dao接口都可以使用 -->
            <package name="org.example.dao"/>
        </mappers>
    </configuration>
    

    2.4.2 在AccountDao接口的方法上添加注解,编写SQL语句

    /**
     * 账户dao接口
     */
    @Repository
    public interface AccountDao {
    
        // 查询所有账号信息
        @Select("select * from account")
        public List<Account> findAll();
    
        // 保存账户信息
        @Insert("insert into account(name,money) values(#{name},#{money})")
        public void saveAccount(Account account);
    }
    

    2.4.3 编写测试的方法

    public class TestMyBatis {
    
        /**
         * 测试查询
         * @throws Exception
         */
        @Test
        public void run1() 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
            SqlSession session = factory.openSession();
            // 获取到代理对象
            AccountDao dao = session.getMapper(AccountDao.class);
            // 查询所有信息
            List<Account> accounts = dao.findAll();
    
            for(Account account: accounts){
                System.out.println(account);
            }
            // 关闭资源
            session.close();
            in.close();
        }
    
        /**
         * 测试保存
         * @throws Exception
         */
        @Test
        public void run2() throws Exception {
            Account account = new Account();
            account.setName("熊大");
            account.setMoney(3000d);
    
            // 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
            SqlSession session = factory.openSession();
            // 获取到代理对象
            AccountDao dao = session.getMapper(AccountDao.class);
            // 查询所有信息
            dao.saveAccount(account);
            // 提交事务
            session.commit();
            // 关闭资源
            session.close();
            in.close();
        }
    }
    

    2.5 Spring整合MyBatis框架

    2.5.1 把SqlMapConfig.xml配置文件中的内容配置到applicationContext.xml配置文件中

    <!--Spring整合MyBatis框架-->
    <!--配置连接池-->
    <!-- 配置C3P0的连接池对象 -->
    <bean id="dataSource"
          class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />
        <property name="url" value="jdbc:mysql://localhost:3306/ssm?useUnicode=true&amp;characterEncoding=UTF-8" />
        <property name="username" value="root" />
        <property name="password" value="root" />
    </bean>
    
    <!--配置SqlSessionFactory工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
    </bean>
    
    <!-- 配置扫描dao的包 -->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="org.example.dao"/>
    </bean>
    
    <!-- 配置事务管理器 -->
    <bean  id="transactionManager"
           class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <!-- 配置事务的通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED" read-only="false"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    <!-- 配置 aop -->
    <aop:config>
        <!-- 配置切入点表达式 -->
        <aop:pointcut  expression="execution(* org.example.service.impl.*.*(..))"
                       id="pt1"/>
        <!-- 建立通知和切入点表达式的关系 -->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"/>
    </aop:config>
    

    2.5.2 在AccountDao接口中添加@Repository注解

    /**
     * 账户dao接口
     */
    @Repository
    public interface AccountDao {
    
        // 查询所有账号信息
        @Select("select * from account")
        public List<Account> findAll();
    
        // 保存账户信息
        @Insert("insert into account(name,money) values(#{name},#{money})")
        public void saveAccount(Account account);
    }
    

    2.5.3 在service中注入dao对象,进行测试

    /**
     * 账户service接口实现类
     */
    @Service("accountService")
    public class AccountServiceImpl implements AccountService {
    
        @Autowired
        AccountDao accountDao;
    
        @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: 保存账户信息..");
            accountDao.saveAccount(account);
        }
    }
    

    2.5.4 配置Spring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"></property>
    </bean>
    <!-- 配置事务的通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="*" propagation="REQUIRED" read-only="false"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>
    <!-- 配置 aop -->
    <aop:config>
        <!-- 配置切入点表达式 -->
        <aop:pointcut  expression="execution(* org.example.service.impl.*.*(..))"
                       id="pt1"/>
        <!-- 建立通知和切入点表达式的关系 -->
        <aop:advisor advice-ref="txAdvice" pointcut-ref="pt1"/>
    </aop:config>
    

    2.5.5 测试保存帐户的方法

    jsp 代码:

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
        <a href="account/findAll">测试</a><br/>
    
        <h3>测试保存</h3>
        <form action="account/save" method="post">
            姓名:<input type="text" name="name"/><br/>
            金额:<input type="text" name="money"/><br/>
            <input type="submit" value="提交"/><br/>
        </form>
    
    </body>
    </html>
    
    list.jsp
    <%@ 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>查询所有的账户信息</h3>
        <c:forEach items="${list}" var="account">
            ${account.name}&nbsp;&nbsp;&nbsp;&nbsp;${account.money}<br/>
    
        </c:forEach>
    
    ${list}
    </body>
    </html>
    

    controller 代码:

    /**
     * 账户控制器(web层)
     */
    @Controller
    @RequestMapping("/account")
    public class AccountController {
    
        @Autowired
        AccountService accountService;
    
        @RequestMapping("findAll")
        public String  findAll(Model model){
            System.out.println("表现层: 查询所有账户...");
            List<Account> list = accountService.findAll();
            model.addAttribute("list",list);
            return "list";
        }
    
        @RequestMapping("save")
        public void  dave(Account account, HttpServletRequest request, HttpServletResponse response) throws Exception {
            System.out.println("表现层: 保存账户信息...");
            accountService.saveAccount(account);
            response.sendRedirect(request.getContextPath()+ "/account/findAll");
            return;
        }
    
    }
    

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