DWR 应用实例(一) 新闻发布系统，多种新闻类型之间切换无刷新

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DWR Hibernate Struts Myeclipse Ajax

最近闲着用dwr做了个类似 163 新闻导航，在多种新闻类型下切换，无须刷新：
step1: 下载DWR包
step2: 构建数据库

sql 代码

if exists (select 1
from sysobjects
where id = object_id('AJAX_NEW')
and type = 'U')
drop table AJAX_NEW
go
/*==============================================================*/
/* Table: AJAX_NEW */
/*==============================================================*/
create table AJAX_NEW (
ID integer not null,
NEW_TITLE VARCHAR(100) null,
NEW_AUTHER VARCHAR(30) null,
NEW_TYPE VARCHAR(30) null,
NEW_CONTENT VARCHAR(500) null,
constraint PK_AJAX_NEW primary key (ID)
)
go

step3 搭建Struts,Hibernate框架，生成Hibernae配置文件以及po类：

java 代码

package com.fzfx88.conf;
/**
* AbstractAjaxNew generated by MyEclipse - Hibernate Tools
* po 抽象类
* auther huguoqing
*/
public abstract class AbstractAjaxNew implements java.io.Serializable {
// Fields
private Integer id;
private String newTitle;
private String newAuther;
private String newType;
private String newContent;
// Constructors
/** default constructor */
public AbstractAjaxNew() {
}
/** full constructor */
public AbstractAjaxNew(String newTitle, String newAuther, String newType, String newContent) {
this.newTitle = newTitle;
this.newAuther = newAuther;
this.newType = newType;
this.newContent = newContent;
}
// Property accessors
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
public String getNewTitle() {
return this.newTitle;
}
public void setNewTitle(String newTitle) {
this.newTitle = newTitle;
}
public String getNewAuther() {
return this.newAuther;
}
public void setNewAuther(String newAuther) {
this.newAuther = newAuther;
}
public String getNewType() {
return this.newType;
}
public void setNewType(String newType) {
this.newType = newType;
}
public String getNewContent() {
return this.newContent;
}
public void setNewContent(String newContent) {
this.newContent = newContent;
}
}

ＰＯ类，MyEclipse 5.1.1生成：

java 代码

package com.fzfx88.conf;
// Generated by MyEclipse - Hibernate Tools
/**
* AjaxNew generated by MyEclipse - Hibernate Tools
* auther huguoqing
*/
public class AjaxNew extends AbstractAjaxNew implements java.io.Serializable {
// Constructors
/** default constructor */
public AjaxNew() {
}
/** full constructor */
public AjaxNew(String newTitle, String newAuther, String newType, String newContent) {
super(newTitle, newAuther, newType, newContent);
}
}

Hibernate AjaxNew.hbm.xml配置文件

xml 代码

xml version="1.0"?>
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.fzfx88.conf.AjaxNew" table="AJAX_NEW" schema="dbo" catalog="pepsi">
<id name="id" type="java.lang.Integer">
<column name="ID" />
<generator class="identity" />
id>
<property name="newTitle" type="java.lang.String">
<column name="NEW_TITLE" length="100" />
property>
<property name="newAuther" type="java.lang.String">
<column name="NEW_AUTHER" length="30" />
property>
<property name="newType" type="java.lang.String">
<column name="NEW_TYPE" length="30" />
property>
<property name="newContent" type="java.lang.String">
<column name="NEW_CONTENT" length="500" />
property>
class>
hibernate-mapping>

step:4 构建 Action 类：

java 代码

/**
* news system
*/
package com.fzfx88.base.action;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import com.fzfx88.base.form.AjaxNewsSystemForm;
import com.fzfx88.base.service.AjaxNewsSystemService;
import com.fzfx88.common.base.BaseAction;
import com.fzfx88.conf.AjaxNew;
/**
* @author huguoqing
*
*/
public class AjaxNewsSystemAction extends BaseAction {
AjaxNewsSystemService nService = new AjaxNewsSystemService();
/**
* 初始化
* @param mapping
* @param form
* @param request
* @param response
* @return
*/
public ActionForward init(ActionMapping mapping,ActionForm form,
HttpServletRequest request,HttpServletResponse response){
AjaxNewsSystemForm nForm = (AjaxNewsSystemForm)form;
AjaxNew news = nForm.getNews();
return mapping.findForward("init");
}
/**
* 新建
* @param mapping
* @param form
* @param request
* @param response
* @return
*/
public ActionForward save(ActionMapping mapping,ActionForm form,
HttpServletRequest request,HttpServletResponse response){
AjaxNewsSystemForm nForm = (AjaxNewsSystemForm)form;
AjaxNew news = nForm.getNews();
if(nService.createNews(news)){
return mapping.findForward("success");
}else{
return mapping.findForward("false");
}
}
}

step 5: 构建数据层访问类：

java 代码

/**
*
*/
package com.fzfx88.base.service;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.Hibernate;
import org.hibernate.HibernateException;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.fzfx88.conf.AjaxNew;
import com.fzfx88.util.HibernateUtil;
/**
* @author huguoqing
*
*/
public class AjaxNewsSystemService {
/**
* 新建news
* @param news
*/
public boolean createNews(AjaxNew news){
Session session=HibernateUtil.currentSession();
Transaction tran=session.beginTransaction();
try{
session.save(news);
tran.commit();
session.flush();
} catch (HibernateException e) {
if(tran!=null){
tran.rollback();
}
e.printStackTrace();
return false;
}finally {
HibernateUtil.closeSession();
}
return true;
}
/**
* 获得新闻列表
* @param newType
* @return
*/
public List queryStoreList(String newType){
List storeList =new ArrayList();
Session session=HibernateUtil.currentSession();
Transaction tran=session.beginTransaction();
String sql="from AjaxNew where newType=:newType ";
try {
Query query=session.createQuery(sql);
query.setParameter("newType",newType);
storeList=query.list();
} catch (HibernateException e) {
if(tran!=null){
tran.rollback();
}
e.printStackTrace();
}finally {
HibernateUtil.closeSession();
}
return storeList;
}
/**
* 根据id获得AjaxNew对象
* @param id
* @return
*/
public AjaxNew retrieveAjaxNew(String newId){
Integer id = Integer.parseInt(newId);
Session session=HibernateUtil.currentSession();
String sql="from AjaxNew w where w.id=:id ";
AjaxNew item=null;
try {
Query query=session.createQuery(sql);
query.setParameter("id",id);
item=(AjaxNew)query.uniqueResult();
if(Hibernate.isInitialized(item)){
Hibernate.initialize(item);
}
} catch (HibernateException e) {
e.printStackTrace();
}finally {
HibernateUtil.closeSession();
}
return item;
}
}

step 6: 构建Struts Form .................AjaxNewsSystemForm.java

step 7 :Struts 配置文件：

xml 代码

xml version="1.0" encoding="UTF-8"?>
>
<struts-config>
<data-sources/>
<form-beans>
<form-bean name="AjaxNewsSystemForm" type="com.fzfx88.base.form.AjaxNewsSystemForm" />
form-beans>
<global-exceptions />
<global-forwards>
<forward name="success" path="/regSuccess.htm"/>
<forward name="false" path="/false.htm"/>
global-forwards>
<action-mappings>
<action name="AjaxNewsSystemForm"
path="/news"
type="com.fzfx88.base.action.AjaxNewsSystemAction"
scope="request">
<forward name="init" path="/base/news.jsp"/>
action>
action-mappings>
<message-resources parameter="resource.ApplicationResources" />
struts-config>