Java學習不走彎路教程（23 整合SSM）
阿新 • • 發佈：2018-11-11
整合SSM
一. 前言
在前上一章教程中，我們實現了springmvc框架。
本章將在上一章的基礎上，進一步擴充套件程式。
注：
1.本文針對初學Java的同學訓練學習思路，請不要太糾結於細節問題。
2.本文旨在達到拋磚引玉的效果，希望大家擴充套件本例子，以學到更多知識的精髓。
學習本章需要準備的知識：
1.讀完本系列教程的前面章節。
2.瞭解SSM的基本用法。
二. 步入正題
話不多說，大家自己理解，下面步入正題：
我們將SpringMVC,Spring,Mybatis整合到一起。
首先把如下Jar包下載並放到工程的lib目錄下：
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
工程的包結構如下：
1.整合SpringMVC和Spring
我們採用註解的方式宣告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 }
然後讓Spring掃描我們的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
我們需要把Mybatis的SessionFactory和Mapper讓Spring來識別並進行管理.
首先我們把dao換成Mapper介面，然後讓Spring載入Mapper介面即可。
程式碼如下：
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 "> <!-- 配置資料來源 --> <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&characterEncoding=UTF-8"/> <property name="username" value="root"/> <property name="password" value="1qaz2wsx"/> <!-- 初始化連線大小 --> <property name="initialSize" value="0" /> <!-- 連線池最大使用連線數量 --> <property name="maxActive" value="20" /> <!-- 連線池最大空閒 --> <property name="maxIdle" value="20" /> <!-- 連線池最小空閒 --> <property name="minIdle" value="0" /> <!-- 獲取連線最大等待時間 --> <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介面 --> <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的事務管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource" /> </bean> <!-- 註解方式配置事物 --> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
3.其他檔案
其他檔案和上一章一樣，不需要改動，我把他們貼在下面：
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. 測試
啟動伺服器：
向伺服器請求person.html檔案，在瀏覽器端輸入1，點query按鈕：
顯示查詢結果：
完整程式請大家從[這裡]下載
如有問題，大家來我的網站進行提問。
https://www.java123.vip/qa
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