基于spring+dwr+xml无刷新投票(调查)系统

flustar

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spring

XML DWR Spring JavaScript Servlet

一、建立xml的数据结构，文件名为：vote.xml，内容如下：

<?xml version="1.0" encoding="UTF-8"?>

</votes>

在你的web应用的根目录建立xml文件夹，将其拷贝到该目录下。

二、建立xml对应的bean

/**

* @author flustar

* @version 创建时间：Jul 11, 2007 5:17:53 PM

* 类说明

……………………………………………………………………….

public class VoteBean {

private String voteId;

private String name;

private String voteCount;

private String voteTotalCount;

private String percentum;

public VoteBean() {

}

public String getPercentum() {

return percentum;

}

public void setPercentum(String percentum) {

this.percentum = percentum;

}

public String getVoteId() {

return voteId;

}

public void setVoteId(String voteId) {

this.voteId = voteId;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getVoteCount() {

return voteCount;

}

public void setVoteCount(String voteCount) {

this.voteCount = voteCount;

}

三、建立处理具体逻辑的service

package com.flustar.service;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.text.NumberFormat;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.jdom.Attribute;

import org.jdom.Document;

import org.jdom.Element;

import org.jdom.input.SAXBuilder;

import org.jdom.output.Format;

import org.jdom.output.XMLOutputter;

import org.jdom.xpath.XPath;

import com.flustar.web.beans.VoteBean;

import com.flustar.web.config.ContextConfig;

public class VoteService {

private Element root, vote;

private Document doc;

private Attribute voteTotalCount;

private VoteBean voteBean;

private List<VoteBean> voteBeanList;

private String path = ContextConfig.getContextPath()

+ "/xml/vote.xml";

public void buildDoc() throws Exception {

FileInputStream fi = null;

fi = new FileInputStream(path);

SAXBuilder sb = new SAXBuilder();

doc = sb.build(fi);

}

public void formatDoc() throws Exception {

Format format = Format.getCompactFormat();

format.setEncoding("UTF-8");// 设置xml文件的字符为UTF-8

format.setIndent(" ");// 设置xml文件缩进为4个空格

XMLOutputter xmlOut = new XMLOutputter(format);

xmlOut.output(doc, new FileOutputStream(path));

}

public String floatToPercentum(Double doubleNum) {

NumberFormat numberFormat = NumberFormat.getPercentInstance();

numberFormat.setMinimumFractionDigits(2);

// numberFormat.setMaximumIntegerDigits(2);

String str = numberFormat.format(doubleNum);

//System.out.println(str);

return str;

}

public void updateVoteCount(String voteId) throws Exception {

buildDoc();

root = doc.getRootElement();

vote = (Element) XPath.selectSingleNode(root, "//vote[@voteId='"

+ voteId + "']");

int voteCount = Integer.parseInt(vote.getAttributeValue("voteCount")) + 1;

//System.out.println(voteCount);

vote.setAttribute("voteCount", String.valueOf(voteCount));

int totalCount = Integer.parseInt(root

.getAttributeValue("voteTotalCount")) + 1;

voteTotalCount = new Attribute("voteTotalCount", String

.valueOf(totalCount));

root.setAttribute(voteTotalCount);

System.out.println(totalCount);

formatDoc();

updateAllVoteCount();//更新所有的百分比

}

public void updateAllVoteCount()throws Exception{

buildDoc();

root=doc.getRootElement();

int totalCount = Integer.parseInt(root

.getAttributeValue("voteTotalCount"));

List voteList=XPath.selectNodes(root,"/votes/vote");

for(int i=0;i<voteList.size();i++){

vote=(Element)voteList.get(i);

int voteCount = Integer.parseInt(vote.getAttributeValue("voteCount"));

System.out.println(voteCount);

vote.setAttribute("voteCount", String.valueOf(voteCount));

vote.setAttribute("percentum", floatToPercentum(1.0 * voteCount

/ totalCount));

}

formatDoc();

}

public List getAllVote() throws Exception {

buildDoc();

voteBeanList = new ArrayList();

root = doc.getRootElement();

String totalCount = root.getAttributeValue("voteTotalCount");

List voteList = root.getChildren();

Iterator i = voteList.iterator();

while (i.hasNext()) {

voteBean = new VoteBean();

voteBean.setVoteTotalCount(totalCount);

vote = (Element) i.next();

String name = vote.getAttributeValue("name");

String voteCount = vote.getAttributeValue("voteCount");

String percentum = vote.getAttributeValue("percentum");

voteBean.setName(name);

voteBean.setVoteCount(voteCount);

voteBean.setPercentum(percentum);

voteBeanList.add(voteBean);

}

return voteBeanList;

}

public String getVoteTotalCount() {

return voteTotalCount;

}

public void setVoteTotalCount(String voteTotalCount) {

this.voteTotalCount = voteTotalCount;

}

四、获取上下文路径的listener

package com.flustar.web.listener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import com.flustar.web.config.ContextConfig;

public class ConfigLoadContextListener implements ServletContextListener{

public void contextDestroyed(ServletContextEvent arg0) {

// TODO Auto-generated method stub

}

public void contextInitialized(ServletContextEvent contextEvent) {

// TODO Auto-generated method stub

String contextPath = contextEvent.getServletContext().getRealPath("/");

ContextConfig.setContextPath(contextPath);

}

………………………………………………………..

……………………………………………………………

public class ContextConfig {

private static String contextPath;

public static String getContextPath() {

return contextPath;

}

public static void setContextPath(String contextPath) {

ContextConfig.contextPath = contextPath;

}

……………………………………………………………………

………………………………………………………………..

}

五、在applicationContext-service.xml中注册VoteService

六、注册xml，在你的web应用的WEB-INFO目录下建立applicationContext-dwr.xml文件，内容为：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN" "http://getahead.org/dwr/dwr20.dtd">

<dwr>

<allow>

</create>

</allow>

</dwr>

七、修改web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

version="2.4">

…………………………………………………………………………………………………………………………

………………………………………………………………………………………………………………………………..

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>

…………………………………..

/WEB-INF/classes/applicationContext-service.xml

</param-value>

</context-param>

……………………………………………………………………………………………………………………………………………. <listener-class>com.flustar.web.listener.ConfigLoadContextListener</listener-class>

…………………………………………………………………………………………………………………………………………….

<servlet-name>dwr-invoker</servlet-name>

<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>

<init-param>

<param-name>debug</param-name>

<param-value>true</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>dwr-invoker</servlet-name>

<url-pattern>/dwr/*</url-pattern>

</servlet-mapping>

…………………………………………………………………………………………………………………………………………….

</web-app>

八、jsp页面

<%@ page contentType="text/html; charset=gbk" language="java" import="java.sql.*" errorPage="" %>

<html>

<head>

function vote(){

var obj=document.getElementsByName('radio');

if (obj!=null){

var j=0;

for (var i=0;i<obj.length;i++){

if (obj[i].checked)

{

VoteService.updateVoteCount(obj[i].value);

alert("投票成功!");

obj[i].checked=false;

break;

}

j=j+1;

}

if(j==obj.length){

alert("请选中其中的一项，再投票!");

}

function showwin(){

window.open('voteresult.htm','voteresult','height=400, width=400, top=0, left=0, toolbar=no, menubar=no, scrollbars=no, resizable=no,location=no, status=no');

}

</script>

</head>

<body>

<div >

<h1 >

你使用最多的一门语言是？

</h1>

</div>

<div>

C语言</h1>

</span>

</div>

</body>

</html>

<html>

<head>

function showresult(){

VoteService.getAllVote(function(data){

document.getElementById("totalCount").innerHTML=data[0].voteTotalCount;

for(var i=0;i<data.length;i++){

var voteBean=data[i];

document.getElementById("xuanshou"+i).innerHTML=voteBean.name;

document.getElementById("baifenbi"+i).innerHTML=voteBean.percentum;

document.getElementById("piaoshu"+i).innerHTML=voteBean.voteCount;

document.getElementById("img"+i).width=voteBean.voteCount/data[0].voteTotalCount*310;

}

});

}

</script>

</head>

投票结果

</CAPTION>

<tbody>

<tr >

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

<tr>

</tr>

</tbody>

</table>

共<span id="totalCount"></span>条投票<br/>

[<span onClick="javascript:window.close();">关闭窗口</span>]

</div>

</body>

</html>

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设计模式学习笔记(一)--Facade外观模式 | 用prototype实现前台表单的验证(无刷新验 ...

2007-11-19 18:04
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