因为很多时候我们用到异步刷新,所以我们现在来做一个小的demo
package org.heinrich.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/tojson.aa")
public class AjaxServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public AjaxServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String json = "{name:'heinrich',age:'10'}";
response.setContentType("text/html");
response.getWriter().write(json);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}
下面是html代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-1.3.2.js"></script>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Ajax</title>
</head>
<body>
<script type="text/javascript">
$(document).ready(function() {
$("#ajax").click(
function(){
alert("dddd");
$.ajax({
url: "${pageContext.request.contextPath}/tojson.aa",
dataType:"json",
success:function(data){
alert("name="+data.name+",age="+data.age);
},
error:function(){
alert("aaaa");
}
});
}
);
});
</script>
<table>
<tr>
<td>
<input type="submit" value="TestAjax" id="ajax">
</td>
</tr>
</table>
</body>
</html>