文件上传带进度条

Ajax Progress Bar Example

Launch long-running process:

package cn.Ajax.test;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")

public class ProgressBarServlet extends HttpServlet {

private int counter = 1;

/**

* The doGet method of the servlet.

*

* This method is called when a form has its tag value method equals to get.

*

* @param request the request send by the client to the server

* @param response the response send by the server to the client

* @throws ServletException if an error occurred

* @throws IOException if an error occurred

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

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 = "64";break;

case 6: percent = "73";break;

case 7: percent = "89";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();

}

/**

* The doPost method of the servlet.

*

* This method is called when a form has its tag value method equals to post.

*

* @param request the request send by the client to the server

* @param response the response send by the server to the client

* @throws ServletException if an error occurred

* @throws IOException if an error occurred

*/

public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request, response); }

}