Java学习不走弯路教程（23 整合SSM）

整合SSM

一. 前言
在前上一章教程中，我们实现了springmvc框架。
本章将在上一章的基础上，进一步扩展程序。

注：
1.本文针对初学Java的同学训练学习思路，请不要太纠结于细节问题。
2.本文旨在达到抛砖引玉的效果，希望大家扩展本例子，以学到更多知识的精髓。

学习本章需要准备的知识：
1.读完本系列教程的前面章节。
2.了解SSM的基本用法。

二. 步入正题
话不多说，大家自己理解，下面步入正题：

我们将SpringMVC,Spring,Mybatis整合到一起。

首先把如下Jar包下载并放到工程的lib目录下：
com.mysql.jdbc_5.1.5.jar
commons-dbcp-1.4.jar
commons-logging-1.2.jar
commons-pool-1.6.jar
mybatis-3.4.6.jar
mybatis-spring-1.3.2.jar
spring-aop-5.1.0.RELEASE.jar
spring-beans-5.1.0.RELEASE.jar
spring-context-5.1.0.RELEASE.jar
spring-core-5.1.0.RELEASE.jar
spring-expression-5.1.0.RELEASE.jar
spring-jdbc-5.1.0.RELEASE.jar
spring-tx-5.1.0.RELEASE.jar
spring-web-5.1.0.RELEASE.jar
spring-webmvc-5.1.0.RELEASE.jar

工程的包结构如下：

1.整合SpringMVC和Spring
我们采用注解的方式声明Service，修改PersonService.java如下：

 1 package vip.java123.fileview.app.service;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.stereotype.Service;
 5 
 6 import vip.java123.fileview.app.dao.PersonMapper;
 7 import vip.java123.fileview.app.dao.entity.Person;
 8 
 9 /**
10  * 
11  * @author http://www.java123.vip
12  *
13  */
14 @Service
15 public class PersonService {
16 
17     @Autowired
18     private PersonMapper personDao;
19     
20     public Person getPerson(String personid) {
21         Person person = personDao.selectPerson(personid);
22         return person;
23     }
24 }

然后让Spring扫描我们的service包即可：
app-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    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://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    
    
    <context:component-scan base-package="vip.java123.fileview.app.web"/>
    <context:component-scan base-package="vip.java123.fileview.app.service"/>
    <mvc:annotation-driven/>
    
    <import resource="spring-mybatis.xml"/>

</beans>

2.整合Spring和Mybatis
我们需要把Mybatis的SessionFactory和Mapper让Spring来识别并进行管理.
首先我们把dao换成Mapper接口，然后让Spring加载Mapper接口即可。
代码如下：

 1 package vip.java123.fileview.app.dao;
 2 
 3 import vip.java123.fileview.app.dao.entity.Person;
 4 
 5 /**
 6  * 
 7  * @author http://www.java123.vip
 8  *
 9  */
10 public interface PersonMapper {
11 
12     public Person selectPerson(String personid);
13 }

PersonMapper.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="vip.java123.fileview.app.dao.PersonMapper">
  <select id="selectPerson" resultType="vip.java123.fileview.app.dao.entity.Person">
    select * from person where id = #{arg0}
  </select>
</mapper>

spring-mybatis.xml

<?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:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop" xsi:schemaLocation="
http://www.springframework.org/schema/beans 
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
http://www.springframework.org/schema/tx 
http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/aop 
http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
">

    <!-- 配置数据源 -->
    <bean name="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8"/>
        <property name="username" value="root"/>
        <property name="password" value="1qaz2wsx"/>
        <!-- 初始化连接大小 -->
        <property name="initialSize" value="0" />
        <!-- 连接池最大使用连接数量 -->
        <property name="maxActive" value="20" />
        <!-- 连接池最大空闲 -->
        <property name="maxIdle" value="20" />
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="0" />
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="60000" />
    </bean>
    
    <!-- 配置SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <!-- 配置mapper.xml -->
        <property name="mapperLocations" value="classpath:vip/java123/fileview/app/dao/*.xml" />
    </bean>
    <!-- 配置Mapper接口 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="vip.java123.fileview.app.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>
    
    <!-- 配置Spring的事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
    <!-- 注解方式配置事物 -->
    <tx:annotation-driven transaction-manager="transactionManager" />

</beans>

3.其他文件

其他文件和上一章一样，不需要改动，我把他们贴在下面：

web.xml

<?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>fileview_web05</display-name>

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

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>/WEB-INF/app-context.xml</param-value>
    </context-param>

    <servlet>
        <servlet-name>app</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value></param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>app</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

</web-app>

 1 package vip.java123.fileview.app.web;
 2 
 3 import org.springframework.beans.factory.annotation.Autowired;
 4 import org.springframework.stereotype.Controller;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 import org.springframework.web.bind.annotation.RequestMethod;
 7 import org.springframework.web.bind.annotation.RequestParam;
 8 import org.springframework.web.bind.annotation.ResponseBody;
 9 
10 import vip.java123.fileview.app.dao.entity.Person;
11 import vip.java123.fileview.app.service.PersonService;
12 
13 /**
14  * 
15  * @author http://www.java123.vip
16  *
17  */
18 @Controller
19 public class PersonController {
20 
21     @Autowired
22     private PersonService personService;
23     
24     @RequestMapping(value = "/person.do", method = RequestMethod.GET)
25     @ResponseBody
26     public String query(@RequestParam("personid")String personId) {
27         System.out.println("in query");
28         Person personResult = personService.getPerson(personId);
29         
30         StringBuffer result = new StringBuffer();
31         result.append("id:"+personResult.id);
32         result.append("<br/>username:"+personResult.username);
33         result.append("<br/>password:"+personResult.passwd);
34         
35         return result.toString();
36     }
37 }

 person.html

<!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">
<title>Insert title here</title>
<script type="text/javascript">
function doQuery(){
    document.getElementById("result").innerHTML = "loading...";
    var xmlhttp = new XMLHttpRequest();

    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == XMLHttpRequest.DONE) {   // XMLHttpRequest.DONE == 4
           if (xmlhttp.status == 200) {
               document.getElementById("result").innerHTML = xmlhttp.responseText;
           }else {
               document.getElementById("result").innerHTML = "loading data error.";
           }
        }
    };
    
    var personid = document.getElementById("personid").value;
    xmlhttp.open("GET", "person.do?personid="+personid, true);
    xmlhttp.send();
}
</script>
</head>
<body>
<form action="/person" method="get">
please input personid:<input id="personid" name="personid"/><input type="button" value="query" onclick="doQuery()"/>
</form>
<div id="result">
</div>
</body>
</html>

三. 测试
启动服务器：

向服务器请求person.html文件，在浏览器端输入1，点query按钮：

显示查询结果：

完整程序请大家从[这里]下载

如有问题，大家来我的网站进行提问。
https://www.java123.vip/qa

版权声明：本教程版权归java123.vip所有，禁止任何形式的转载与引用。