Jquery progressbar通过Ajax请求获取后台进度演示【java】

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。
【Jquery progressbar通过Ajax请求获取后台进度演示】2.前台index.jsp
jsp代码如下

My JSP 'index.jsp' starting page - 锐客网

3.struts.xml文件的配置

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, 2013Nanjing,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 = https://www.it610.com/article/Integer.parseInt(progressValueString); if(progressValue>100){ progressValue = https://www.it610.com/article/0; } System.out.println(" getCookie:---progressValue="https://www.it610.com/article/+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 = https://www.it610.com/article/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