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http中的ajax与 jquery_ajax中的用法解读

2012-06-13 10:17 302 查看

备注：红色代表关键代码

1,第一个ajax，前台页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

    <script type="text/javascript">

function loadXMLDoc()

{

var xmlhttp;
if (window.XMLHttpRequest)

{// code for IE7+, Firefox, Chrome, Opera, Safari

xmlhttp=new XMLHttpRequest();

}

else

{// code for IE6, IE5

xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");

}

xmlhttp.onreadystatechange=function()

{

if (xmlhttp.readyState==4 && xmlhttp.status==200)

    {

    document.getElementById("myDiv").innerHTML=xmlhttp.responseText;

    }

}

////////下面这个是get方法传递

/*
var url = encodeURL("<%=basePath%>AjavServlet?name=张三");
xmlhttp.open("GET",url,true);
xmlhttp.send();

*/

////////下面这个是post方法传递

xmlhttp.open("POST","<%=basePath%>AjavServlet",true);

xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");

xmlhttp.send("name=张三");

}

</script>

</head>

<body>

   <button type="button" onclick="loadXMLDoc()">请求数据</button>

   <div id="myDiv"></div>

</body>

</html>

1,第一个ajax，后台页面

public class AjavServlet extends HttpServlet {

   public void doGet(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {

        this.doPost(request, response);

   }

   public void doPost(HttpServletRequest request, HttpServletResponse response)

           throws ServletException, IOException {



       String name = request.getParameter("name");

//       name = new String(name.getBytes("ISO-8859-1"),"UTF-8");

       response.setContentType("text/html");

       response.setCharacterEncoding("utf-8");

       PrintWriter out = response.getWriter();



       out.println(new Date());

       out.println(name);



       out.flush();

       out.close();

   }

}

2,第二个jquery-ajax，前台页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<%

String path = request.getContextPath();

String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<script type="text/javascript" src="<%=basePath %>Jquery-1.7.2.min.js"></script>

<script type="text/javascript">

function loadXMLDoc(){

/////// get的第一种写法

/*

   $.ajax({

   url:"<%=basePath%>AjavServlet",

   type:"GET",

   data:{name="zhangsansan"},

   success:function(data){

     document.getElementById("myDiv").innerHTML=data;

     }

   });

   */

/////// get的第二种写法

   $.get("<%=basePath%>AjavServlet",{name="zhangsansan"},function(data){

        document.getElementById("myDiv").innerHTML=data;

   });

}

</script>

</head>

<body>

<button type="button" onclick="loadXMLDoc()">ÇëÇóÊý¾ÝjqueryAjax</button>

   <div id="myDiv"></div>

</body>

</html>

2,第二个jquery-ajax，后台页面与第一个一样

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标签： ajax jquery xmlhttprequest string button function

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