搭建简单的EXT-GWT(GXT)的开发环境(三)gxt结合spring和hibernate进行数据操作

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gwt ext spring hibernate jpa

随便写着玩玩.不要太认真哦^^

主要还涉及了一点JPA方面的知识,如果不知道JPA是什么的--!ZZZZZZZ

第一件事当然是把hibernate需要的jar包都添加到项目中.如果不太清楚的可以参考下面的截图给的jar

接下来是配置hibernate.要说明的是此处我是参考一个台湾朋友的做法.虽然有点麻烦...XD

在resources下添加一个包,然后把hibernate.properties和jdbc.properties放到这个目录下
hibernate.properties

hibernate.dialect=org.hibernate.dialect.MySQLDialect

hibernate.show_sql=false
hibernate.format_sql=false
hibernate.cache.use_query_cache=true
hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider
hibernate.connection.provider_class=org.hibernate.connection.C3P0ConnectionProvider
hibernate.hbm2ddl.auto=update

jdbc.properties

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/map?useUnicode=true&characterEncoding=UTF-8&autoReconnect=true
jdbc.username=root
jdbc.password=root

# Time to wait for an open connection before timing out
# (in milliseconds)
cpool.checkoutTimeout=5000

# Connection pool size
cpool.minPoolSize=10
cpool.maxPoolSize=25

# How long to keep unused connections around(in seconds)
# Note: MySQL times out idle connections after 8 hours(28,800 seconds)
# so ensure this value is below MySQL idle timeout
cpool.maxIdleTime=7200

# Acquiring new connections is slow, so eagerly retrieve extra connections
# when current pool size is reached
cpool.acquireIncrement=5

cpool.autoCommitOnClose=true

然后添加dataAccessContext-hibernate.xml到spring这个包下面,注意里面的packagesToScan属性,你需要把你的所以实体类所在包都显示的在这个里面写出来,如果多个包,就有多个value

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">
<beans default-autowire="byName" >

	<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
	<property name="driverClass" value="${jdbc.driverClassName}" />	
	<property name="jdbcUrl" value="${jdbc.url}" />	
	<property name="user" value="${jdbc.username}" />	
	<property name="password" value="${jdbc.password}" />		
	<property name="initialPoolSize" value="${cpool.minPoolSize}"/>	
	<property name="minPoolSize" value="${cpool.minPoolSize}" />	
	<property name="maxPoolSize" value="${cpool.maxPoolSize}" />	
	<property name="acquireIncrement" value="${cpool.acquireIncrement}" /> 
   <property name="maxIdleTime" value="${cpool.maxIdleTime}"/>
   
	</bean>	

	<!--Hibernate SessionFatory-->
	<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<property name="packagesToScan">
			<list>
				<value>com.yx.map.client.bean</value>	
			</list>
		</property>	
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">${hibernate.dialect}</prop>
				<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
				<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
				<prop key="hibernate.cache.provider_class">${hibernate.cache.provider_class}</prop>
				<prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</prop>
				<prop key="hibernate.connection.provider_class">${hibernate.connection.provider_class}</prop>
				<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
			</props>
		</property>
	</bean>
    
</beans>

接下来修改applicationContext.xml,在其中添加以下内容

<!-- 支持 @Transactional 标记 -->
	<tx:annotation-driven />

	<!-- 支持 @AspectJ 标记 -->
	<aop:aspectj-autoproxy />

	<!-- 属性文件读入 -->
	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath*:config/jdbc.properties</value>
				<value>classpath*:config/hibernate.properties</value>
			</list>
		</property>
	</bean>
	<!-- <aop:config proxy-target-class="true"> <aop:advisor pointcut="execution(* 
		com.xxxx.server..*ServiceImpl.*(..))" advice-ref="txAdvice"/> 
		</aop:config> 基本事务定义,使用transactionManager作事务管理,默认get*方法的事务为readonly,其余方法按默认设置. 
		默认的设置请参考Spring文档事务一章. <tx:advice id="txAdvice"> <tx:attributes> <tx:method 
		name="get*" read-only="true"/> <tx:method name="find*" read-only="true"/> 
		<tx:method name="query*" read-only="true"/> <tx:method name="*"/> </tx:attributes> 
		</tx:advice> -->

	<!-- Transaction 設定 -->
	<bean id="txProxyTemplate" abstract="true"
		class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
		<property name="transactionManager" ref="transactionManager" />
		<property name="proxyTargetClass" value="true" />
		<property name="transactionAttributes">
			<props>
				<prop key="save*">PROPAGATION_REQUIRED, ISOLATION_READ_COMMITTED,
					-Exception</prop>
				<prop key="update*">PROPAGATION_REQUIRED, ISOLATION_READ_COMMITTED,
					-Exception</prop>
				<prop key="remove*">PROPAGATION_REQUIRED, ISOLATION_READ_COMMITTED,
					-Exception</prop>
				<prop key="*">PROPAGATION_SUPPORTS,ISOLATION_READ_COMMITTED,readOnly
				</prop>
			</props>
		</property>
	</bean>

	<!--Hibernate TransactionManager -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

	<!-- Dao 設定 -->
	<bean id="abstractSpringHibernateDao"
		class="com.chinatenet.gxt.park.server.dao.AbstractSpringHibernateDao"
		abstract="true">
		<property name="transactionManager" ref="transactionManager" />
		<property name="sessionFactory" ref="sessionFactory" />
	</bean>

然后添加Hibernate的baseManage和baseDao,由于代码比较大,这2个类放在附件里面
注意这个2个类是需要放在项目的server包下面的

到此,基本的hibernate配置就算完成了.接下来,我们测试一下效果怎么样吧.简单的做法是创建一个实体,然后创建这个实体的数据服务

首先创建一个实体类,我这里叫ParkData.请注意,在gwt中,如果需要传至client端的java类是都需要放到client这个包下面的..所以我这里建立的包叫com.yx.map.client.bean,接下来,你需要把这个类实现序列化,以便gwt使用.我这里用的IsSerializable接口,^^,google自己的序列化方式.然后就是一些JPA的注解了...不了解的可以自己查询JPA的相关资料

package com.yx.map.client.bean;

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

import com.google.gwt.user.client.rpc.IsSerializable;

@Entity
@Table(name="parkdata")
public class ParkData implements IsSerializable{

	/**
	 * 
	 */
	private static final long serialVersionUID = 7995434803827667106L;

	@Id
	@GeneratedValue
	private int id;
	@Column
	private String parkName;
	@Column
	private String address;
	@Column
	private String descs;
	@Column
	private String allNum;
	@Column
	private String lastNum;
	@Column
	private String tel;
	@Column
	private String updateTime;
	@Column
	private double lat;
	@Column
	private double lng;
	@Column
	private String icon;
	
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	
	public String getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public String getParkName() {
		return parkName;
	}
	public void setParkName(String parkName) {
		this.parkName = parkName;
	}
	public String getDescs() {
		return descs;
	}
	public void setDescs(String descs) {
		this.descs = descs;
	}
	public String getAllNum() {
		return allNum;
	}
	public void setAllNum(String allNum) {
		this.allNum = allNum;
	}
	public String getLastNum() {
		return lastNum;
	}
	public void setLastNum(String lastNum) {
		this.lastNum = lastNum;
	}
	public String getTel() {
		return tel;
	}
	public void setTel(String tel) {
		this.tel = tel;
	}
	public String getUpdateTime() {
		return updateTime;
	}
	public void setUpdateTime(String updateTime) {
		this.updateTime = updateTime;
	}
	public double getLat() {
		return lat;
	}
	public void setLat(double lat) {
		this.lat = lat;
	}
	public double getLng() {
		return lng;
	}
	public void setLng(double lng) {
		this.lng = lng;
	}
	public String getIcon() {
		return icon;
	}
	public void setIcon(String icon) {
		this.icon = icon;
	}
	
	@Override
	public String toString() {
		return getParkName();
	}
	
}

接下来就是创建ParkData所对应的dao和manager.具体做法见代码.注意dao上面的org.springframework.stereotype.Repository注解.使用此注解后,spring会生成一个此类的bean,bean的名称就是类名,但是首字母是小写的.然后就是这个manager,你可以更具你的需求.把一些业务代码放到这个manager里面.我这里就不写了~

ParkDataDao

package com.yx.map.server.dao.mapdao;


import org.springframework.stereotype.Repository;

import com.yx.map.client.bean.ParkData;
import com.yx.map.server.dao.AbstractSpringHibernateDao;

@Repository
public class ParkDataDao<E> extends
		AbstractSpringHibernateDao<E> {

	@Override
	protected Class<ParkData> getClazz() {
		return ParkData.class;
	}

}

ParkDataManager

package com.yx.map.server.dao.mapdao;

import com.yx.map.client.bean.ParkData;
import com.yx.map.server.dao.BaseManager;


public class ParkDataManager extends BaseManager<ParkData> {

}

在创建对应实体所对应的dao和manager时,一定要注意范型的使用...

接下来,需要让spring来管理这个manager,所以打开applicationContext.xml,在里面添加以下代码

<!--Manager 設定 -->
	<bean id="parkDataManager" parent="txProxyTemplate" lazy-init="true">
		<property name="target">
			<bean class="com.yx.map.server.dao.mapdao.ParkDataManager"
				lazy-init="true">
				<property name="dao" ref="parkDataDao" />
			</bean>
		</property>
	</bean>

好了,准备工作都就绪了,这个时候就可以在RPC服务中调用这些dao层的代码了.
首先打开GreetingServiceImpl,再里面添加一个manager,然后生成此manager对应的set方法并给予@Autowired注释以便spring注入.

private ParkDataManager parkDataManager;
	
	@Autowired
	public void setParkDataManager(ParkDataManager parkDataManager) {
		this.parkDataManager = parkDataManager;
	}

然后在greetServer(String input)中修改return中的一些代码

ParkData data =  parkDataManager.findById(1);
		if(null==data)
			return "Hello, " + input + "!<br>你还没有添加数据进来呢<br>I am running " + serverInfo
			+ ".<br><br>It looks like you are using:<br>" + userAgent;
		else
			return "Hello, " + input + "!<br>欢迎光临"+data.toString()+"<br>I am running " + serverInfo
			+ ".<br><br>It looks like you are using:<br>" + userAgent;

对了,在此之前,你需要在数据库中先创建一个名字为map的数据库(这个名字根据你自己的配置文件中的数据库名字而定).表就不建了,JPA会给我们创建的.

并且运行一下吧,不出意外,在数据库中就会生成一张表出来,打开他,添加一些测试数据进去吧.然后在页面中输入文字,点击发送看看效果吧.