Struts2.x、Spring3.x、Hibernate3.x整合开发
SSH整合开发的步骤：
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：
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
<!-- 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>
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
<!-- 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>
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>
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
<!-- 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>
三、在源文件夹中添加配置文件：
1>添加applicationContext.xml配置文件
<?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.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-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/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" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- 配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" 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" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" 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>
2>添加Struts配置文件struts.xml
<?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" class="userAction"> <result>index.jsp</result> </action> </package> </struts>
3>添加ehcache.xml配置文件，是第三方二级缓存，这个在上面applicationContext.xml中使用到，里面都是默认值
<ehcache>
<diskStore path="java.io.tmpdir"/>
<defaultCache
maxElementsInMemory="10000"
eternal="false"
timeToIdleSeconds="120"
timeToLiveSeconds="120"
overflowToDisk="true"
/>
</ehcache>
四、在类中使用注解
1>pojo类使用注解，如User.java
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：
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
@Service
public 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
@Autowired
public 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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