SSH 配置实例: Spring 3.1 + Hibernate 4.2 + Struts 2.3

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Spring
Struts
Hibernate

Spring 3.1 Hibernate 4.2 Struts 2.3 ssh

搞JAVA的小伙伴们都遇到这样的面试官：

问：你会SSH吗？

答：会

问：说说怎么用的？

答：。。。（内心爆出一句脏话）

很久没有弄过SSH了，还记得当初用的是hibernate 3， strut2，然而JAVA发展太快了，我们今天要讲述的是 Spring 3.1 + Hibernate 4.2 + Struts 2.3。搞SSH的都知道，这个版本太蛋疼了，各种不兼容，各种不知道怎么配置。度娘被蹂躏了千百次，终于将新版的SSH搞定了，分享一下。

首先是架包，搞JAVA最头疼的就是乱七八糟的jar，想用下SSH，发现居然要导入那么多jar，而且架包之间还有依赖，所以最好的就是使用Maven去找架包，但是有些小伙伴没有MAVEN环境怎么办？只能一个一个的去找，一个一个去导入到项目中。苦逼的程序员。

所有依赖的架包我都已经上传，有需要的到附件里下载，a-d.7z, f-h.7z, j-p.7z 和 s-z.7z。

项目结构如图：

配置文件有3个：web.xml, dispatcher-servlet.xml 和 struts.xml

先看最简单的struts.xml, 我把他放在src下面了，就直接打到classpath下面了。

<?xml version="1.0" encoding="UTF-8" ?>  
<!DOCTYPE struts PUBLIC
	"-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"
	"http://struts.apache.org/dtds/struts-2.1.dtd">
  <struts>  
  	<constant name="struts.objectFactory" value="spring"/> 
     <package name="credit" extends="struts-default"  namespace="/">  
        <action name="city" class="com.bank.credit.action.CityAction">  
            <result name="success">/bank.jsp</result>  
        </action>  
     </package>
       
  </struts>

很简单的配置，就陪着了一个city，成功返回bank.jsp

再看看spring的配置：

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:c="http://www.springframework.org/schema/c" xmlns:cache="http://www.springframework.org/schema/cache"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:sec="http://www.springframework.org/schema/security" xmlns:jee="http://www.springframework.org/schema/jee"
	xmlns:lang="http://www.springframework.org/schema/lang" xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
		http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd
		http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-3.1.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
		http://www.springframework.org/schema/security http://www.springframework.org/schema/security/spring-security-3.1.xsd
		http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">

	<mvc:annotation-driven>
		<mvc:message-converters>
			<bean class="org.springframework.http.converter.StringHttpMessageConverter">
				<property name="supportedMediaTypes">
					<list>
						<value>text/html;charset=UTF-8</value>
						<value>text/plain;charset=UTF-8</value>
					</list>
				</property>
			</bean>
		</mvc:message-converters>
	</mvc:annotation-driven>

	<context:component-scan base-package="com.bank.credit"></context:component-scan>

	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
		destroy-method="close">
		<property name="driverClass" value="com.mysql.jdbc.Driver" />
		<property name="jdbcUrl"
			value="jdbc:mysql://localhost:3307/bank?characterEncoding=UTF-8&amp;characterSetResults=UTF-8" />
		<property name="user" value="root" />
		<property name="password" value="admin" />
		<property name="maxPoolSize" value="100" />
		<property name="minPoolSize" value="20" />
		<property name="initialPoolSize" value="10" />
		<property name="maxIdleTime" value="1800" />
		<property name="acquireIncrement" value="10" />
		<property name="idleConnectionTestPeriod" value="600" />
		<property name="acquireRetryAttempts" value="30" />
		<property name="breakAfterAcquireFailure" value="false" />
		<property name="preferredTestQuery" value="SELECT NOW()" />
	</bean>

	<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
		<constructor-arg ref="dataSource"></constructor-arg>
	</bean>

	<!-- hibernate 需要的信息 -->
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="packagesToScan">
			<list>
				<value>com.bank.credit.entity</value>
			</list>
		</property>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
				<prop key="hibernate.show_sql">true</prop>
				<prop key="hibernate.format_sql">true</prop>
			</props>
		</property>
	</bean>
	<aop:aspectj-autoproxy expose-proxy="true" />

	<tx:annotation-driven transaction-manager="txManager" />
	<bean id="txManager"
		class="org.springframework.orm.hibernate4.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

	<tx:advice id="txAdvice" transaction-manager="txManager">
		<tx:attributes>
			<tx:method name="save*" propagation="REQUIRED" />
			<tx:method name="add*" propagation="REQUIRED" />
			<tx:method name="create*" propagation="REQUIRED" />
			<tx:method name="insert*" propagation="REQUIRED" />
			<tx:method name="*" read-only="true" />
		</tx:attributes>
	</tx:advice>

	<aop:config proxy-target-class="true">
		<aop:advisor advice-ref="txAdvice"
			pointcut="execution(* com..service..*.*(..))" />
	</aop:config>
</beans>

主要是配置了数据源和hibernate的sessionFactory还有事务。和网上的一样。

有一个要注意的地方：

<list>

<value>com.bank.credit.entity</value>

</list>

</property>

这个一定要配置正确，不然查询时会报错【hibernate4 xxx is not mapped】，这个指定对了就不要hibernate的配置文件了，不需要做mapping了，通过注解的方式就可以。另外事务一定要配置。

再看看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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name>credit</display-name>
  <filter>
  <filter-name>CharacterEncoding</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>
  <init-param>
   <param-name>forceEncoding</param-name>
   <param-value>true</param-value>
  </init-param>
 </filter>
  <filter-mapping>
  <filter-name>CharacterEncoding</filter-name>
  <url-pattern>/*</url-pattern>
 </filter-mapping>

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

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

 <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>*.action</url-pattern>  
    </filter-mapping>  
</web-app>

定义了spring的监听器和配置文件，定义了struts的拦截器。这个没什么好讲的。

看下City这个Entity的类：

package com.bank.credit.entity;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "BANK_CITY")
public class City {

	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;

	@Column(name = "NAME")
	private String name;

	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;
	}

}

指定table name 和 column name。

数据库的建表语句：

CREATE TABLE `bank_city` (
	`ID` INT(9) NULL DEFAULT NULL,
	`NAME` VARCHAR(20) NULL DEFAULT NULL
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB;

看Action类：

package com.bank.credit.action;

import java.util.List;

import javax.annotation.Resource;

import org.apache.struts2.ServletActionContext;
import org.springframework.stereotype.Controller;

import com.bank.credit.entity.City;
import com.bank.credit.service.CityService;
import com.opensymphony.xwork2.ActionSupport;

@Controller
public class CityAction extends ActionSupport {

	private static final long serialVersionUID = 1L;

	@Resource
	private CityService service;

	public String execute() throws Exception {
		List<City> citys = service.list();
		ServletActionContext.getRequest().setAttribute("CITYLIST", citys);
		return SUCCESS;
	}
}

类加@Controller 注解，用到的Service使用@Resource注入

再看下Service的实现类：

package com.bank.credit.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.bank.credit.dao.CityDao;
import com.bank.credit.entity.City;
import com.bank.credit.service.CityService;

@Service
public class CityServiceImpl implements CityService{

	@Autowired
	private CityDao dao;
	
	@Override
	public List<City> list() {
		return dao.listCitys();
	}

}

类使用@Service注解，使用的DAO使用@Autowired注入

再看下DAO的实现类：

package com.bank.credit.dao.impl;

import java.util.List;

import org.springframework.stereotype.Repository;

import com.bank.credit.dao.CityDao;
import com.bank.credit.entity.City;

@Repository 
public class CityDaoImpl extends BaseDao implements CityDao {

	@Override
	public List<City> listCitys() {
		
		 return this.findAll(City.class);
	}

}

类使用@Repository 注解，继承了BaseDao

再看看BaseDao这个类：

package com.bank.credit.dao.impl;

import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;

public class BaseDao {

	@Autowired  
    private SessionFactory sessionFactory;  
      
    public Session getSession(){  
        return sessionFactory.getCurrentSession();  
    }
    
    protected void save(Object obj) {
        getSession().save(obj);
    }

    @SuppressWarnings("unchecked")
	protected <T> T get(Class<T> clazz, int id) {
        return (T) getSession().get(clazz, id);
    }
    
    @SuppressWarnings("unchecked")
    protected <T> List<T> findAll(Class<T> clazz) {
        return getSession().createCriteria(clazz).list();
    }

    protected void update(Object obj) {
        getSession().update(obj);
    }

    protected void delete(Class<?> clazz, int id) {
        getSession().delete(get(clazz, id));
    }


    protected void delete(Object obj) {
        getSession().delete(obj);
    }
}

注入了SessionFacotry，使用的都是Session（Hibernate4）的方法

最后看看页面：

<%@ page language="java" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>City List</title>
</head>

<body>
<div id="man_zone">
<form action="add_Department_add" method="post">
  <table width="50%" border="1px" align="center" >
    <tr>
      <td width="50%" style="text-align: center">City ID</td>
      <td width="50%" style="text-align: center">City Name</td>
    </tr>
   	<s:if test="#request.CITYLIST.size>0">
   		<s:iterator value="#request.CITYLIST">
   		 	<tr>
		      <td style="text-align: center"><s:property value="id" /></td>
		      <td style="text-align: center"><s:property value="name" /></td>
		    </tr>
   		</s:iterator>
   	</s:if>

  </table>
  </form>
</div>
</body>
</html>

非常简单，就是把数据显示在页面上：