简单易学的SSM（Spring+SpringMVC+MyBatis）整合

2023-07-16 19:14:15

SSM（Spring+SpringMVC+MyBatis）的整合：

具体执行过程： 1.用户在页面向后台发送一个请求

2.请求由DispatcherServlet 前端控制器拦截交给SpringMVC管理，SpringMVC讲这个请求传递给Controller层处理。

同时请求由Listener监听到交付给Spring，Spring建立IOC容器。

3.Controller层中会调用相应的Service层的方法处理业务逻辑。此时Service从上一步中建立好的IOC容器获取对象，然后获取

到Mapper接口中的代理类对象调用接口中的方法。

4.这个方法在对应的SQL映射文件mapper.xml中执行SQL语句，与数据库交互，获取到结果后返回给Service中的这个方法，

然后返回给Controller，再跳转到JSP页面显示给用户。

总结：SpringMVC 与前台页面交互

Spring 处理业务逻辑

MyBatis 与数据库打交道

从下面的配置中不难发现： SpringMVC的底层是由Listener实现的

Spring本质是一个Servler

这有助于大家理解SSM

SSM配置：

建立动态WEB项目，导入相应JAR包：

然后在web.xml中配置Spring和SpringMVC：

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">

  <display-name>Spring-SpringMVC-MyBatis</display-name>

  <!-- 配置Spring -->

  <!--配置Listener监听浏览器发过来的请求  并动态创建IOC容器-->

  <context-param>

    <param-name>contextConfigLocation</param-name>

    <param-value>classpath:applicationContext.xml</param-value>

  </context-param>

  <listener>

    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

  </listener>

  <!-- 配置SpringMVC -->

  <!-- 配置前端控制器，拦截相应的请求 -->

  <servlet>

    <servlet-name>springDispatcherServlet</servlet-name>

    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

    <init-param>

      <param-name>contextConfigLocation</param-name>

      <param-value>classpath:springmvc.xml</param-value>

    </init-param>

    <load-on-startup>1</load-on-startup>

  </servlet>

  <servlet-mapping>

    <servlet-name>springDispatcherServlet</servlet-name>

    <url-pattern>/</url-pattern>

  </servlet-mapping>

   <!-- 配置过滤器来处理post乱码问题 -->

  <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>

   <!--  浏览器form表单只支持GET与POST请求，而DELETE、PUT等method并不支持，所以添加过滤器转化 -->

   <!-- 配置过滤器来将PUT请求转化为PUT DELETE请求 -->

  <filter>

    <filter-name>HiddenHttpMethodFilter</filter-name>

    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>

  </filter>

  <filter-mapping>

    <filter-name>HiddenHttpMethodFilter</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>

   <!-- 默认的访问文件 -->

  <welcome-file-list>

    <welcome-file>index.html</welcome-file>

    <welcome-file>index.htm</welcome-file>

    <welcome-file>index.jsp</welcome-file>

    <welcome-file>default.html</welcome-file>

    <welcome-file>default.htm</welcome-file>

    <welcome-file>default.jsp</welcome-file>

  </welcome-file-list>

</web-app>

对应的编辑SpringMVC的配置文件 springmvc.xml（注意这个xml的类型是 Spring Bean Configuration File）

<?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-4.0.xsd

        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <!-- 配置扫描包，使SpringMVC只扫描Controller层 -->

    <context:component-scan base-package="com.neuedu" use-default-filters="false">

       <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>

       <context:include-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>

    </context:component-scan>

    <!-- 配置视图解析器 -->

    <bean

        class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="prefix" value="/WEB-INF/views/"></property>

        <property name="suffix" value=".jsp"></property>

    </bean>

    <!-- 可以处理静态资源 -->

    <mvc:default-servlet-handler />

    <!-- 标配，功能强大，诸多用处。例如使处理静态资源后RequestMapping继续能够使用等功能 -->

    <mvc:annotation-driven></mvc:annotation-driven>

</beans>

对应配置Spring的配置文件 spring.xml 文件类型同上，不过我们通常命名为applicationContext.xml 蕴含整个项目之意

<?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:p="http://www.springframework.org/schema/p" 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-3.2.xsd

        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd

        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd

        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

    <!-- 扫描相关除去Controller的包 -->

    <context:component-scan base-package="com.neuedu" >

      <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>

      <context:exclude-filter type="annotation" expression="org.springframework.web.bind.annotation.ControllerAdvice"/>

    </context:component-scan>

    <!-- 加载外部属性文件 -->

    <context:property-placeholder location="classpath:jdbc.properties" />

    <!-- 配置c3p0数据源 -->

    <bean id="comboPooledDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">

        <property name="user" value="${jdbc.username}"></property>

        <property name="password" value="${jdbc.password}"></property>

        <property name="driverClass" value="${jdbc.driver}"></property>

        <property name="jdbcUrl" value="${jdbc.url}"></property>

    </bean>

    <!-- 配置事务管理 -->

    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

        <property name="dataSource" ref="comboPooledDataSource"></property>

    </bean>

    <!-- 开启基于注解的声明式事务 -->

    <tx:annotation-driven transaction-manager="dataSourceTransactionManager"/>

    <!-- Spring与MyBatis整合 -->

    <!-- 配置SqlSession工厂 -->

    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">

        <property name="dataSource" ref="comboPooledDataSource"></property>

        <property name="configLocation" value="classpath:mybatis-config.xml" ></property>

    </bean>

    <!-- 扫描Mapper包 -->

    <bean  class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="basePackage" value="com.neuedu.mapper"></property>

    </bean>

</beans>

这里有个jdbc.properties外部文件连接数据库使用，读者视情况修改

jdbc.username:root

jdbc.password:123456

jdbc.driver:com.mysql.jdbc.Driver

jdbc.url:jdbc:mysql://localhost:3306/studentmanage

对应配置MyBatis的配置文件 mybatis-config.xml

<?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>

 <properties resource="jdbc.properties"></properties>

 <settings>

     <!-- 驼峰式命名 -->

     <setting name="mapUnderscoreToCamelCase" value="true"/>

 </settings>

</configuration>

如果想要在控制台打印日志可添加log4j.xml 这个文件固定，请读者自行按需添加，在此不做赘述。

至此，配置完毕。然后在src下建立相应的包即可，一般来说

bean 通用实体类 ------------------------------------------- 与数据库表对应的类

mapper 存放mapper接口和对应的.xml 文件 ------------------------------------------ 由MyBatis 管理

service 处理业务逻辑 ------------------------------------------- 由Spring管理

controller 与前端进行交互 -------------------------------------------- 由SpringMVC管理

好，废话不多说，开始项目（以一个简单的显示学生列表的方式展示SSM）

建数据库:

在bean包中建立Stu.java

在mapper包中建立接口StuMapper.java 和对应的StuMapper.xml SQL映射文件

在sevice包的StuServce.java 中调用接口中的方法

在controller中StuController 中调用Service层的方法然后讲结果返回给JSP页面显示

具体代码如下：

Stu.java:

package com.neuedu.bean;

public class Stu {

    private int ID;

    private String UserName;

    private String PassWord;

    public Stu() {

        super();

    }

    public Stu(int iD, String userName, String passWord) {

        super();

        ID = iD;

        UserName = userName;

        PassWord = passWord;

    }

    public Stu(String userName, String passWord) {

        super();

        UserName = userName;

        PassWord = passWord;

    }

    public int getID() {

        return ID;

    }

    public void setID(int iD) {

        ID = iD;

    }

    public String getUserName() {

        return UserName;

    }

    public void setUserName(String userName) {

        UserName = userName;

    }

    public String getPassWord() {

        return PassWord;

    }

    public void setPassWord(String passWord) {

        PassWord = passWord;

    }

    @Override

    public String toString() {

        return "Stu [ID=" + ID + ", UserName=" + UserName + ", PassWord=" + PassWord + "]";

    }

}

StuMapper.java:

package com.neuedu.mapper;

import java.util.List;

import com.neuedu.bean.Stu;

public interface StuMapper {

    public List<Stu> getStuList();

}

StuMapper.xml:

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE mapper

  PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

  "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.neuedu.mapper.StuMapper">

    <select id="getStuList" resultType="com.neuedu.bean.Stu">

        select * from stu

    </select>

</mapper>

StuService.java:

package com.neuedu.service;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import com.neuedu.bean.Stu;

import com.neuedu.mapper.StuMapper;

@Service

public class StudentService {

    @Autowired

    private StuMapper mapper;

    public List<Stu> getStuList() {

        return mapper.getStuList();

    }

}

StuController.java:

package com.neuedu.controller;

import java.util.List;

import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import com.neuedu.bean.Stu;

import com.neuedu.service.StudentService;

@Controller

public class StuController {

    @Autowired

    private StudentService studentService;

    @RequestMapping(value="/getStuList")

    public String getStuList(Map<String,Object> map){

        List<Stu> list=studentService.getStuList();

        map.put("stulist", list);

        return "StudentList";

    }

}

StudentList.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery.min.js"></script>

<title>学生信息展示</title>

</head>

<body>

<h1 align="center">学生信息</h1>

<div align="center">

<form action="${pageContext.request.contextPath}/queryStu" method="post">

<input type="text" name="queryname" placeholder="请输入将要查找的姓名" >

<input type="submit" value="查询"/>

 </form>

 </div>

<table border="1" align="center" width="50%">

<tr>

            <th>姓名</th>

            <th>密码</th>

            <th colspan="2">操作</th>

</tr>

<c:forEach items="${stulist}" var="stu">

<tr>

            <td>${stu.userName}</td>

            <td>${stu.passWord}</td>

            <td><a href="${pageContext.request.contextPath}/deleteStu?id=${stu.ID}">删除</a></td>

            <td><a href="${pageContext.request.contextPath}/toUpdateStu?id=${stu.ID}">修改</a></td>

</tr>

</c:forEach>

<tr>

     <td colspan="5" align="center" ><a href="${pageContext.request.contextPath}/toAddStu">添加</a> </td>

 </tr>

</table>

<br/>

</body>

</html>

页面显示：

第一次写这么多，有什么错误的地方欢迎批评指正！

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