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

 

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

<!--sp-->xml version="1.0"?>
<!--CTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"   </sp-->
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--  </span> </li> <li class="alt"><span><span class="comments">    Mapping file autogenerated by MyEclipse - Hibernate Tools </span> </span></li> <li class=""><span><span class="comments">-->
<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

<!--sp-->xml version="1.0" encoding="UTF-8"?>
<!--CTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd"</sp-->>

<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>