jquery获取后台数据简单例题

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jquery获取后台数据简单例题

html部分:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>jqueryXmlImg.html</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">

<script type="text/javascript" src="../js/jquery.min.js"></script>

<script type="text/javascript">
function verify(){
   var url="../AjaxServletImg?userName="+$("#userName").val();
   //url=convertURL(url);
   $.get(url,null,callback);
}
function callback(data){
   $("#resultMess").html(data);
}
function convertURL(url){
   var timestamp=(new Date()).valueOf();
   if(url.indexOf("?")>=0){
    url=url+"&t="+timestamp;
   }else{
    url=url+"?t="+timestamp;
   }
   return url;
}
</script>
</head>

<body>
   <input type="text" name="userName" id="userName" value="1111111" />
   <input type="button" name="btn1" id="btn1" onclick="verify();" value="测试" />
   <div id="resultMess"></div>
</body>
</html>

后台servlet部分:

package com.wf.servlet;

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;
import javax.servlet.http.HttpSession;

public class AjaxServletImg extends HttpServlet {

/**
* Constructor of the object.
*/
public AjaxServletImg() {
   super();
}

/**
* Destruction of the servlet. <br>
*/
public void destroy() {
   super.destroy(); // Just puts "destroy" string in log
   // Put your code here
}

/**
* The doGet method of the servlet. <br>
*
* 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 {

   doPost(request,response);
}

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

   response.setContentType("text/html;charset=utf-8");
   PrintWriter out = response.getWriter();
   HttpSession sess=request.getSession();
   Integer inte=(Integer) sess.getAttribute("total");
   int temp=0;
   if(inte==null){
    sess.setAttribute("total",1);
   }else{
    temp=inte.intValue()+1;
    sess.setAttribute("total",temp);
   }
   try{
    String userName=request.getParameter("userName");
    System.out.println(userName);
    if(userName==null||userName.length()==0){
     out.println("用户名不能为空!"+temp);
    }else{
     if("oppa".equals(userName)){
      out.println("用户名"+userName+"已经存在"+temp);
     }else{
      out.println("用户名"+userName+"可以注册使用!"+temp);
     }
    }
   }catch(Exception e){
    e.printStackTrace();
   }
   out.flush();
   out.close();
}

public void init() throws ServletException {
}

}

说明:url=convertURL(url);这是让浏览器不读缓存的方法

中文乱码问题解决方法:

方法一:

1.var url="../AjaxServletImg?userName="+encodeURI($("#userName").val());

前台encodeURI()转换下

2.后台String userName=request.getParameter("userName");
    System.out.println(userName);
    userName=new String(userName.getBytes("iso8859-1"),"UTF-8");

也再转换下

1和2结合方能解决中文乱码问题   这是方法一

方法二:

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2012-02-24 14:02
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