Spring + SpringMVC+ MyBatis(SSM)

2020-04-08  本文已影响0人  阿杰_96c5

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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