测试页面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>AJax Post</title>
<script type="text/javascript">
function checkName(){
var xml_request = new XMLHttpRequest();
var namevalue = document.getElementById("name").value;
//xml_request.open("post","CheckServlet?name=zhangsan",true);
xml_request.open("post","CheckServlet",true);
//必须写到 send之前
xml_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
xml_request.send("name="+namevalue);
xml_request.onreadystatechange = function(){
if(xml_request.readyState==4&&xml_request.status==200){
var name1 = xml_request.responseText; //关注此处
alert(name1+"sd\nda");
alert(namevalue);
alert(name1==(namevalue+"\r\n"))
document.getElementById("result").innerHTML=xml_request.responseText;
}
}
}
</script>
</head>
<body>
<input type="text" name="name" id="name" onblur="checkName();"> <span id="result"></span>
</body>
</html>
Servlet进行处理代码：
package com.bwie;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class CheckServlet extends HttpServlet {
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException {
response.setContentType("text/html");
request.setCharacterEncoding("UTF-8"); //设置请求编码
response.setCharacterEncoding("UTF-8");//设置响应编码
System.out.println(request.getCharacterEncoding());;
System.out.println(response.getCharacterEncoding());
String name = request.getParameter("name");
System.out.println(name);
//new String("ab".getBytes("ISO-8859-1"),"UTF-8");
//URLEncoder.encode("abc","UTF-8");
PrintWriter out = response.getWriter();
out.println(name);
out.flush();
out.close();
}
}
