SSM框架-----------SpringMVC+Spring+Mybatis框架整合详细教程

1、基本概念

1.1、Spring

Spring是一个开源框架,Spring是于2003 年兴起的一个轻量级的Java 开发框架,由Rod Johnson 在其著作Expert One-On-One J2EE Development and Design中阐述的部分理念和原型衍生而来。它是为了解决企业应用开发的复杂性而创建的。Spring使用基本的JavaBean来完成以前只可能由EJB完成的事情。然而,Spring的用途不仅限于服务器端的开发。从简单性、可测试性和松耦合的角度而言,任何Java应用都可以从Spring中受益。 简单来说,Spring是一个轻量级的控制反转(IoC)和面向切面(AOP)的容器框架。

1.2、SpringMVC  

Spring MVC属于SpringFrameWork的后续产品,已经融合在Spring Web Flow里面。Spring MVC 分离了控制器、模型对象、分派器以及处理程序对象的角色,这种分离让它们更容易进行定制。

1.3、MyBatis

MyBatis 本是apache的一个开源项目iBatis, 2010年这个项目由apache software foundation 迁移到了google code,并且改名为MyBatis 。MyBatis是一个基于Java的持久层框架。iBATIS提供的持久层框架包括SQL Maps和Data Access Objects(DAO)MyBatis 消除了几乎所有的JDBC代码和参数的手工设置以及结果集的检索。MyBatis 使用简单的 XML或注解用于配置和原始映射,将接口和 Java 的POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。

2.需要的jar包

需要的jar包主要分为以下几类:

1.mysql数据库驱动包以及数据库连接池相关包

2.mybatis框架包和mybatis+spring框架整合包

3.spring包

jar包如下图所示:

SSM框架-----------SpringMVC+Spring+Mybatis框架整合详细教程SSM框架-----------SpringMVC+Spring+Mybatis框架整合详细教程

3.配置school-mybatis.xml

该配置文件默认存放在src目录下,school-mybatis.xml具体配置如下所示:

<?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:mybatis="http://mybatis.org/schema/mybatis-spring"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- 自动扫描 -->
<context:component-scan base-package="cn.wallance" />
<!-- 引入配置文件 -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties" />
</bean> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" /> <!-- 配置连接池的初始值 -->
<property name="initialSize" value="1" />
<!-- 连接池的最大值 -->
<!-- <property name="maxActive" value="500"/> -->
<!-- 最大空闲时,当经过一个高峰之后,连接池可以将一些用不到的连接释放,一直减少到maxIdle为止 -->
<!-- <property name="maxIdle" value="2"/> -->
<!-- 当最小空闲时,当连接少于minIdle时会自动去申请一些连接 -->
<property name="minIdle" value="1" />
<property name="maxActive" value="100" />
<property name="maxIdle" value="20" />
<property name="maxWait" value="1000" />
</bean> <!-- spring和MyBatis完美整合,不需要mybatis的配置映射文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 自动扫描mapping.xml文件 -->
<property name="mapperLocations" value="classpath:cn/wallance/mapping/*.xml"></property>
</bean> <!-- DAO接口所在包名,Spring会自动查找其下的类 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="cn.wallance.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
</bean> <!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean> </beans>

ps:jdbc.properties文件内容如下所示:

SSM框架-----------SpringMVC+Spring+Mybatis框架整合详细教程

4.配置school-servlet.xml文件

school-servlet.xml文件中主要配置spring框架的信息,具体如下所示:

<?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-3.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd"> <!-- 开启注解 -->
<mvc:annotation-driven/>
<!-- 设置组件扫描的基础包 -->
<context:component-scan base-package="cn.wallance.web"/> <!-- 配置视图解析器 -->
<bean class = "org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/school/" />
<property name="suffix" value=".jsp" />
</bean> </beans>

5.配置web.xml,整合SSM框架

web.xml文件如下所示:

<?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"> <!-- 配置DispatcherServlet -->
<servlet>
<servlet-name>school</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>school</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping> <!-- Spring 的监听器可以通过这个上下文参数来获取school-mybatis.xml的位置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:school-mybatis.xml</param-value>
</context-param> <!-- 创建Spring的监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener> <!-- 创建字符过滤器 -->
<filter>
<filter-name>CharacterFilter</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>CharacterFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> </web-app>

6.项目整体框架

SSM框架-----------SpringMVC+Spring+Mybatis框架整合详细教程

6.1 dao包介绍

主要是数据库操作(基于mybatis),分别是一个dao接口和一个dao类。

IUserDao接口:

package cn.wallance.dao;

import java.util.List;

import cn.wallance.domain.User;

public interface IUserDao {
public abstract List<User> selectAll();
}

IUSerDaoImpl类:

package cn.wallance.dao;

import java.util.List;

import javax.annotation.Resource;

import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import org.springframework.stereotype.Repository; import cn.wallance.domain.User; @Repository("userDao")
public class UserDaoImpl extends SqlSessionDaoSupport implements IUserDao { @Resource
public void setSuperSessionFactory(SqlSessionFactory sessionFactory){
this.setSqlSessionFactory(sessionFactory);
} public List<User> selectAll() {
// TODO Auto-generated method stub
List<User> users = this.getSqlSession().selectList("getUser");
return users;
} }

6.2 service包

IUSerService接口:

package cn.wallance.service;

import java.util.List;

import cn.wallance.domain.User;

public interface IUserService {
public abstract List<User> selectAll(); }

UserServiceImpl类:

package cn.wallance.service;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;

import cn.wallance.dao.IUserDao;
import cn.wallance.domain.User; @Service("userService")
public class UserServiceImpl implements IUserService {
private IUserDao userDao; public IUserDao getUserDao() {
return userDao;
} @Resource
public void setUserDao(IUserDao userDao) {
this.userDao = userDao;
} @Override
public List<User> selectAll() {
// TODO Auto-generated method stub
return userDao.selectAll();
} }

6.3 mapping包

该包下主要是mapper文件

usermapper.xml映射文件如下所示:

<?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="cn.wallance.mapping.classMapper">
<select id="getUser" resultType="cn.wallance.domain.User">
select * from users
</select>
</mapper>

6.4 domain包

该包下主要是实体类。

USer类如下所示:

package cn.wallance.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id; @Entity
public class User {
private int id;
private String name;
private int age; public User(){
} public User(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
} @GeneratedValue
@Id
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
} }

6.5.web包

该包下主要是contrller类:

package cn.wallance.web;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod; import cn.wallance.domain.User;
import cn.wallance.service.IUserService; @Controller
public class HomeController {
private IUserService userService; public IUserService getUserService() {
return userService;
} @Resource
public void setUserService(IUserService userService) {
this.userService = userService;
} @RequestMapping(value="/",method=RequestMethod.GET)
public String home(Model model){
List<User> users = userService.selectAll();
model.addAttribute("users", users);
return "home";
} }

6.6 Jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head> <body>
<table>
<tr>
<td>ID</td>
<td>NAME</td>
<td>AGE</td>
</tr>
<c:forEach items="${users}" var="user">
<tr>
<td>${user.id}</td>
<td>${user.name}</td>
<td>${user.age}</td>
</tr>
</c:forEach>
</table>
</body>
</html>

7.项目实际运行效果

SSM框架-----------SpringMVC+Spring+Mybatis框架整合详细教程

至此,SSM框架整合工作已经全部完成,大家可以在此基础上进行进一步的功能扩展!

写在最后:

代码GitHub地址:https://github.com/bywallance01/SSM_School_System

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