Jquery progressbar通过Ajax请求获取后台进度演示

来源：互联网发布：linux移动文件夹编辑：程序博客网时间：2024/06/16 09:40

项目源代码下载：http://download.csdn.net/detail/nuptboyzhb/6262253

1.简介

本文主要演示Jquery progressbar的进度条功能。js通过ajax请求向后台实时获取当前的进度值。后台将进度值存储在cookie中，每次请求后，将进度条的值增2个。以此演示进度条的实时显示功能。

2.前台index.jsp

jsp代码如下

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!--  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> --><!DOCTYPE html><html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><link rel="stylesheet" type="text/css" href="js/themes/default/easyui.css"><link rel="stylesheet" type="text/css" href="js/themes/icon.css"><link rel="stylesheet" type="text/css" href="js/demo/demo.css"><script type="text/javascript" src="js/jquery.min.js"></script><script type="text/javascript" src="js/jquery.easyui.min.js"></script><script type='text/javascript'>var timerId;$(function(){//每隔0.5秒自动调用方法，实现进度条的实时更新timerId=window.setInterval(getForm,500);});function getForm(){            //使用JQuery从后台获取JSON格式的数据            $.ajax({               type:"post",//请求方式               url:"getProgressValueByJson",//发送请求地址               timeout:30000,//超时时间：30秒               dataType:"json",//设置返回数据的格式               //请求成功后的回调函数 data为json格式               success:function(data){                  if(data.progressValue>=100){                     window.clearInterval(timerId);                  }                  $('#p').progressbar('setValue',data.progressValue);              },              //请求出错的处理              error:function(){                 window.clearInterval(timerId);                 alert("请求出错");              }           });}</script></head><body>    <div style="margin:100px 0;"></div>    <div id="p" class="easyui-progressbar" style="width: 400px;"></div></body></html>

3.struts.xml文件的配置

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>    <constant name="struts.devMode" value="true" />    <package name="front" extends="struts-default" namespace="/">        <action name="getProgressValueByJson" class="edu.njupt.zhb.test.TestAction" method="getProgressValueByJson">            <result name="success"></result>        </action>        <action name="TestAction" class="edu.njupt.zhb.test.TestAction">            <result type="httpheader"></result>        </action>    </package></struts>

4.后台的java代码（）

package edu.njupt.zhb.test;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;/* *@author: ZhengHaibo   *web:     http://blog.csdn.net/nuptboyzhb *mail:    zhb931706659@126.com *Sep 13, 2013  Nanjing,njupt,China */public class TestAction extends ActionSupport {/** *  */private static final long serialVersionUID = -8697049781798812644L;/** * 通过Ajax获取json格式的ProgressBar值 * Type：Action */public void getProgressValueByJson(){String progressValueString = getCookie(getRequest(),"progressValue");int progressValue = Integer.parseInt(progressValueString);if(progressValue>100){progressValue = 0;}System.out.println(" getCookie:---progressValue="+progressValue);writeJsonString("{\"progressValue\":\"" + progressValue + "\"}"); progressValue += 2;setCookie(getResponse(),"progressValue",progressValue+"",365*24*60*60);}/** * Get HttpServletRequest Object * @return HttpServletRequest */public HttpServletRequest getRequest(){return ServletActionContext.getRequest();}/** * Get HttpServletResponse Object * @return HttpServletResponse */protected HttpServletResponse getResponse() {return ServletActionContext.getResponse();}/** * Get PrintWriter Object * @return PrintWriter * @throws IOException */protected PrintWriter getWriter() throws IOException {return this.getResponse().getWriter();}/** * 写Json格式字符串 * @param json */protected void writeJsonString(String json) {try {getResponse().setContentType("text/html;charset=UTF-8");this.getWriter().write(json);} catch (IOException e) {e.printStackTrace();}}/** * 获取cookie * @param request * @param name * @return String */public static String getCookie(HttpServletRequest request, String name) {String value = null;try {for (Cookie c : request.getCookies()) {if (c.getName().equals(name)) {value = c.getValue();}}} catch (Exception e) {e.printStackTrace();}return value;}/** * 设置cookie * @param response * @param name * @param value * @param period */public static void setCookie(HttpServletResponse response, String name, String value, int period) {    try {        Cookie div = new Cookie(name, value);        div.setMaxAge(period);        response.addCookie(div);    } catch (Exception e) {        e.printStackTrace();    }}}

5.运行

将项目部署到Tomcat上之后，在浏览器中输入URL，则可以看到进度条逐渐更新