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ajax:post

AjaxServletJSPSafariCache 
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<%@ page language="java"  pageEncoding="UTF-8" contentType="text/html; charset=UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	
	<script type="text/javascript">
		var xmlHttp;
		function verify(){		
   			var username=document.getElementById("username").value;
   			var password=document.getElementById("password").value;
   			var param="username="+username+"&password="+password;
			try	{
    			
    			xmlHttp=new XMLHttpRequest(); // Firefox, Opera 8.0+, Safari
    		} catch (e){
  				
   				try{
   				    xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); // Internet Explorer
      			} catch (e){
      			
      				try{
         				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
         			}catch (e){
         				alert("您的浏览器不支持AJAX！");
         				return false;
         			}
      			}
    		}

			//1.注册回调函数
			xmlHttp.onreadystatechange=callback;
			
			//2.设置连接信息
			xmlHttp.open("POST","checkPost",true);
			//3.设置头信息
	        xmlHttp.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); //这个一定要写在open方法后面
			//4.发送数据，开始与服务器端交互
			xmlHttp.send(param);	
		}
		
		//回调函数代码如下：
		function callback(){
			//判断交互是否完成
			if(xmlHttp.readyState==4){
			//判断http的交互是否成功
				if(xmlHttp.status==200){
					//获取服务器端的纯文本数据
					var responseText=xmlHttp.responseText;
					document.getElementById("show").innerHTML=responseText;
				}else{
					alert("出错了");
				}
			}
		}
	</script>
  </head>
  
  <body>
	<form action="" method="post">
	 用户名：	<input type="text" name="username" id="username" ><br>
	 密码：	<input type="password" name="password"id="password" onBlur="verify();"><br>
	 <div id="show"></div><br>
	 <input type="submit">
	</form>
  </body>
</html>

 ajax:post 提交方案：注意的是一定要先建立连接，再设置头信息

 

package com.asm.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;

public class AjaxServletPost extends HttpServlet {

	private static final long serialVersionUID = 1L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException,
			IOException {
		this.doPost(req, resp);
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		String username = request.getParameter("username");
		String password = request.getParameter("password");
		PrintWriter out = response.getWriter();
		// out.write("你输入的用户名为： + + "</font>");
		out.println("你填入的结果为：<br>");
		out.println("<font color='red'> username="+username+" || password="+password+"</font>");
	}
}
 
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