使用AJAX实现Web页面进度条的实例分享_javascript技巧

<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %> 
<%! 
int counter = 1;//注意：多用户将共享此变量，此进度条只适合单用户 
%> 
<% 
 String task = request.getParameter("task"); 
 String res = ""; 
 
 if (task.equals("create")) { 
 res = "1"; 
 counter = 1; 
 } 
 else { 
 String percent = ""; 
 switch (counter) { 
 case 1: percent = "10"; break; 
 case 2: percent = "23"; break; 
 case 3: percent = "35"; break; 
 case 4: percent = "51"; break; 
 case 5: percent = ""; break; 
 case 6: percent = "73"; break; 
 case 7: percent = ""; break; 
 case 8: percent = "100"; break; 
 } 
 counter++; 
 
 res = "" + percent + ""; 
 } 
 
 // PrintWriter out = response.getWriter(); 
 response.setContentType("text/xml"); 
 response.setHeader("Cache-Control", "no-cache"); 
 out.println(""); 
 out.println(res); 
 out.println(""); 
 out.close(); 
%>