Struts2.x、Spring3.x、Hibernate3.x整合开发
SSH整合开发的步骤：
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一、首先我们先导入jar包:
Struts2.x的jar包、Spring3.x的jar包、Hibernate3.x的jar包、Struts-spring plugin的jar包
二、接下来我们配置web.xml：
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1>添加openSessionInView过滤器，这个配置的作用是：延迟session周期到响应结束,避免延迟加载引起错误,这个过滤器应该放到Struts过滤器的前面，组成过滤器链
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<!-- openSessionInView --><filter><filter-name>openSessionInView</filter-name><filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class></filter><filter-mapping><filter-name>openSessionInView</filter-name><url-pattern>/*</url-pattern></filter-mapping>
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2>添加Struts2.x Filter配置，这个是使用Struts开发必须要配置的，大家应该知道
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<!-- Struts2.x Filter --><filter><filter-name>Struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>Struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping>?
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?3>添加Spring上下文监听器，这个监听器的作用是在web容器启动的时候自动创建applicationContext对象
<!-- Spring上下文监听器 --><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><context-param><param-name>contextConfigLocation</param-name><param-value> classpath:applicationContext*.xml </param-value></context-param>??
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?4>添加Spring 字符集过滤器，避免中文乱码，你懂得，不想配置的话，也可以自己写一个过滤器
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<!-- Spring 字符集过滤器 --><filter><filter-name>springEncoding</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>springEncoding</filter-name><url-pattern>/*</url-pattern></filter-mapping>?
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三、在源文件夹中添加配置文件：
1>添加applicationContext.xml配置文件
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<?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:p="http://www.springframework.org/schema/p" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd" > <!-- 启动自动扫描，便于使用注解把类交给Spring管理--><context:component-scan base-package="com.kaishengit"/> <!-- 开启事务的Annotation支持 --><tx:annotation-driven transaction-manager="transactionManager"/><!-- 配置事务管理器 --><bean id="transactionManager" ref="sessionFactory"/></bean> <!-- 配置数据源 --><bean id="dataSource" value="com.mysql.jdbc.Driver" /><property name="jdbcUrl" value="jdbc:mysql:///ssh" /><property name="maxIdleTime" value="25000" /><property name="properties"><props><prop key="user">root</prop><prop key="password">root</prop><prop key="c3p0.acquire_increment">2</prop><prop key="c3p0.max_size">20</prop><prop key="c3p0.min_size">1</prop></props></property> </bean><!--配置SessionFactory--><bean id="sessionFactory" ref="dataSource"></property><property name="packagesToScan" value="com.kaishengit.pojo"/><property name="hibernateProperties"><props><prop key="hibernate.show_sql">true</prop><prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect </prop><prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider </prop><prop key="hibernate.cache.provider_configuration_file_resource_path">ehcache.xml </prop></props></property></bean> </beans>
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?2>添加Struts配置文件struts.xml
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<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN""http://struts.apache.org/dtds/struts-2.3.dtd"><struts><package name="myPackage" extends="struts-default"><action name="user" name="code"><ehcache> <diskStore path="java.io.tmpdir"/> <defaultCache maxElementsInMemory="10000" eternal="false" timeToIdleSeconds="120" timeToLiveSeconds="120" overflowToDisk="true" /></ehcache>?
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四、在类中使用注解
1>pojo类使用注解，如User.java
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package com.kaishengit.pojo;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.Table;import org.hibernate.annotations.Cache;import org.hibernate.annotations.CacheConcurrencyStrategy;@Entity@Table(name="t_user")@Cache(usage=CacheConcurrencyStrategy.READ_WRITE)public class User {private int id;private String username;private String password;@Id@GeneratedValue(strategy=GenerationType.IDENTITY)public int getId() {return id;}public void setId(int id) {this.id = id;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}}?
2>Spring类使用注解,类交给Spring管理,一种是在applicationContext.xml中配置，但是使用注解非常简便，把需要交给Spring类管理的类上面加上@Service、@Controller、@Component、@Repository任意一种都行,在需要依赖注入的属性的set方法上面加上@Autowired即可，如：
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package com.kaishengit.service;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import org.springframework.transaction.annotation.Transactional;import com.kaishengit.dao.UserDao;import com.kaishengit.pojo.User;@Transactional@Servicepublic class UserService {private UserDao userDao;public void saveOrUpdate(User user){userDao.saveOrUpdate(user);}public void del(int id){userDao.del(id);}@Transactional(readOnly=true)public User findById(int id){return (User) userDao.findById(id);}@Transactional(readOnly=true)public List<User> findAll(){return userDao.findAll();}//set@Autowiredpublic void setUserDao(UserDao userDao) {this.userDao = userDao;}}?3>使用事务，在需要事务的类(一般都是Service类)上面加上@Transactional即可,在查询的方法上面加上@Transactional(readOnly=true)，代表只读事务，更利于性能，例子就是上面的java类
4>Action类，暂且使用struts.xml配置
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