servlet + jquery ajax + json demo
1. 相应的jar包的导入. json-lib-2.2.3-jdk15.jar, ezmorph-1.0.6.jar等.
2. 加入jquery.js
3. jquery each()方法的使用api.
http://api.jquery.com/jQuery.each/
4. 服务端servlet程序
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class JqueryAjaxServer extends HttpServlet {
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
response.setContentType("text/html;charset=utf-8");
String account = request.getParameter("account");
JSONObject json = new JSONObject();
JSONArray array = new JSONArray();
JSONObject member = null;
for (int i = 0; i < 3; i++) {
member = new JSONObject();
member.put("name", "xiaohua"+i);
member.put("age", 20+i);
array.add(member);
}
json.put("account", account);
json.put("jsonArray", array);
PrintWriter pw = response.getWriter();
pw.print(json.toString());
System.out.println("json array :"+array.toString());
System.out.println("json object :"+json.toString());
pw.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
this.doGet(request, response);
}
}
5. jsp页面(jqueryAjax.jsp)
<%@ page language="java" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>jquery ajax</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 src="jquery/jquery-1.3.1.js" type="text/javascript"></script>
<script language="javascript">
$(function(){
$('.sumbit').click(function(){
if($('#account').val().length==0){
$('.hint').text("用户名不能位空").css({"background-color":"green"});
}else{
$.ajax({
url:'jqueryAjax',
data:{account:$('#account').val()},
dataType:'json', //很重要!!!. 预期服务器返回的数据类型
error:function(){
alert("error occured!!!");
},
success:function(data){
$.each(data.jsonArray,function(index){
$.each(data.jsonArray[index],function(key,value){
alert(key+":"+value)
});
});
$('body').append("<div>"+data.account+"</div>").css("color","red");
}
});
}
});
});
</script>
</head>
<body>
<h3 align="center">jquery AjaX</h3>
<hr>
<label>请输入你的账户 ：</label>
<input id="account" name="account" type="text">
<input class="sumbit" type="button" value="检测">
<div class="hint"></div>
</body>
</html>
6. 配置文件web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>jqueryAjaxServer</servlet-name>
<servlet-class>com.june.servlet.JqueryAjaxServer</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>jqueryAjaxServer</servlet-name>
<url-pattern>/jqueryAjax</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>