SSM整合(spring+springMVC+mybatis)

编程语言 2020-02-11 11:02:01 阅读次数: 0

SSM整合

什么是SSM

在这里插入图片描述

即Spring，SpringMVC，Mybatis三大框架整合在一起的技术。

整合的思路

  1. 搭建整合的环境
  2. 先把spring的配置搭建好
  3. 再使用spring整合SpringMVC框架
  4. 最后再使用Spring整合Mybatis框架

整合步骤

  1. 创建一个Maven工程，导入需要的坐标依赖（版本和连接池因人而异）

    <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>compile</scope>
    </dependency>
    <!-- 数据库配置 -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.18</version>
    </dependency>

    <!-- Spring配置-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.8.14</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</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-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</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-test</artifactId>
      <version>5.1.5.RELEASE</version>
    </dependency>

    <!-- jsp -->
    <dependency>
      <groupId>javax.servlet.jsp</groupId>
      <artifactId>javax.servlet.jsp-api</artifactId>
      <version>2.3.3</version>
      <scope>provided</scope>
    </dependency>
    <!-- jstl -->
    <dependency>
      <groupId>javax.servlet.jsp.jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

    <!--mybatis-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.4</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.3</version>
    </dependency>

    <!-- log日志 -->
    <dependency>
      <groupId>log4j</groupId>
      <artifactId>log4j</artifactId>
      <version>1.2.17</version>
    </dependency>

    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.30</version>

    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.30</version>
    </dependency>
  <!-- 连接池 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.21</version>
    </dependency>
    <dependency>
     <!-- 测试 -->
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter</artifactId>
      <version>RELEASE</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <!-- Servlet -->
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>

  2. 编写spring的配置文件

    <?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:context="http://www.springframework.org/schema/context"
       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/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd"
>
    <!--开启扫描，只希望处理Service和dao，controller不需要Spring框架处理-->
    <context:component-scan base-package="cn.okt">
        <!--配置哪些不扫描-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    </beans>

  3. 编写java代码

    1. 业务层

      
public interface AccountService {
    // 查询所有账户信息
    List<Account> findAll();

    // 保存账户信息
    void saveAccount(Account account);
}


      @Service("accountService")
public class AccountServiceImpl implements AccountService{


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

    public void saveAccount(Account account) {
        System.out.println("业务层：保存帐户...");
    }
}

    2. 持久层

      
/**
 * 帐户dao接口
 */
public interface AccountDao {

    // 查询所有账户
    public List<Account> findAll();

    // 保存帐户信息
    public void saveAccount(Account account);

}

    3. 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 +
                '}';
    }
}

  4. 编写测试类，测试spring环境是否搭建成功

    public class TestSpring {
    @Test
    public void run1(){
        ApplicationContext ac=new ClassPathXmlApplicationContext("classpath:spring的配置文件名称");
        AccountService service=(AccountService) ac.getBean("accountService");
        service.findAll();
        service.saveAccount(new Account());
    }
}

  5. Spring整合springMVC，编写web.xml，配置前端控制器，中文乱码，Spring监听器

    <!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Spring的监听器，默认只加载WEB-INF目录下的applicationContext.xml配置文件-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--设置配置文件的路径-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring配置名称</param-value>
    </context-param>
    <!--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配置名称</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>

</web-app>

  6. 编写SpringMVC配置文件

    扫描二维码关注公众号，回复： 9079431 查看本文章 
    <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-4.2.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-4.2.xsd">
    <!--开启注解扫描-->
    <context:component-scan base-package="cn.okt">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <!--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>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!--前端控制器，哪些静态资源不拦截
    <mvc:resources mapping="/js/**" location="/js/"></mvc:resources>
	-->
	
    <!--开启SpringMVC框架注解支持-->
    <mvc:annotation-driven></mvc:annotation-driven>


</beans>

  7. 编写控制层代码

    /**
 * 帐户web
 */
@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的方法
        List<Account> list = accountService.findAll();
        model.addAttribute("list",list);
        return "list";
    }
}

  8. 编写前端页面，并开启tomcat测试

    <index页面>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h3>测试</h3>
<a href="account/findAll">测试</a>
    <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="保存">
    </form>
</body>
</html>

    <list页面>

<%@ 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>已成功查询</h3>
</body>
</html>

  9. Spring整合Mybatis,修改持久层和业务层代码

    @Service("accountService")
public class AccountServiceImpl implements AccountService{

    @Autowired
    private AccountDao accountDao;

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

    public void saveAccount(Account account) {
        System.out.println("业务层：保存帐户...");
        accountDao.saveAccount(account);
    }
}

    /**
 * 帐户dao接口
 */
@Repository
public interface AccountDao {

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

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

}

  10. 在spring配置文件中配置mybatis

    <?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:context="http://www.springframework.org/schema/context"
       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/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        https://www.springframework.org/schema/context/spring-context.xsd
         http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd"
>
    <!--开启扫描，只希望处理Service和dao，controller不需要Spring框架处理-->
    <context:component-scan base-package="cn.okt">
        <!--配置哪些不扫描-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--spring整合mybatis-->
    <!--配置连接池-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql:///ssm?serverTimezone=UTC"></property>
        <property name="username" value="root"></property>
        <property name="password" value="19970930"></property>
    </bean>
    <!--配置SqlSessionFactory-->
    <bean id="sessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置AccountDao接口所在位置-->
    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.okt.dao"></property>
    </bean>
</beans>

  11. 修改前端页面list.jsp，并打开Tomcat进行测试

    <%@ 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>已成功查询</h3>
<c:forEach items="${list}" var="account">
    ${account.name}
</c:forEach>
</body>
</html>

  12. Spring配置事务，在spring配置文件中添加如下

        <!--配置事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <!--方法名为find*的都是只读不提交事务-->
        <tx:attributes>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="*" isolation="DEFAULT"></tx:method>
        </tx:attributes>
    </tx:advice>
    <!--配置AOP增强，一般选用业务层来控制事务-->
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(* cn.okt.service.impl.*ServiceImpl.*(..))"></aop:advisor>
    </aop:config>

  13. 在控制层添加save方法

        @RequestMapping("/save")
    public void save(Account account, HttpServletRequest request, HttpServletResponse response) throws IOException {
        System.out.println("表现层：增加账户...");
        // 调用service的方法
        accountService.saveAccount(account);
        //重定向
        response.sendRedirect(request.getContextPath()+"/account/findAll");
    }

  14. 修改前端页面，并开启Tomcat测试

    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h3>测试</h3>
<a href="account/findAll">测试</a>
    <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="保存">
    </form>
</body>
</html>

总结

归根到底我们要以Spring为核心对其他两个框架进行集成，如若上述测试都通过则代表你已经成功的整合了SSM环境，这时就可以进行项目的开发了。在此处我曾发生了一个让我抓狂的问题，就是在web.xml中将监听类写错了，导致我开启Tomcat时无法加载我的spring的配置文件，从而无法创建所有bean对象，所以一旦发生错误一定要好好看清配置文件是否有配错类，注解是否有漏加，这是典型的错误，毕竟人无完人，总有走神的时候，多加注意就好。

obeeey
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