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AJAX学习笔记之JQ使用方法

2015-04-26 17:10 387 查看

首先在src文件下写好servlet，命名为ajax_Serve：

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLDecoder;
public class ajax_Server extends HttpServlet{
protected void doPost(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){
doGet(httpServletRequest,httpServletResponse);
}
protected void doGet(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse){
try{
httpServletResponse.setContentType("text/html;charset=utf-8");
PrintWriter out = httpServletResponse.getWriter();
String old = httpServletRequest.getParameter("name");
if(old == null || old.length() == 0){
out.println("用户名不能为空");
}else{
String name = old;
if(name.equals("123")){
out.println("用户名["+name+"]已经存在");
}else{
out.println("用户名["+name+"]未存在");
}
}
}catch(Exception e){
e.printStackTrace();
}
}
}

设置好之后，编写web.xml文件:

<?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"> <display-name></display-name>
<welcome-file-list>
<welcome-file>ajax.html</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>ajax_Server</servlet-name>
<servlet-class>ajax_Server</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ajax_Server</servlet-name>
<url-pattern>/ajax_Server</url-pattern>
</servlet-mapping>
</web-app>

编写html文件：

<!DOCTYPE html>
<html>
<head>
<title>ajax.html</title>
<script type="text/javascript" src="js/jquery-1.11.2.min.js"></script>
<script type="text/javascript" src="js/ajax.js"></script>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=GB18030">

<!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

</head>

<body>
This is a ajax's test <br>
<input type="text" id="user_Name" />
<input type="button" id="button" value="校验"  />
<div id="result"></div>
</body>
</html>

编写js文件：

$(function(){
$("#button").click(function(){
verify();
});

});
function verify(){
$.get("ajax_Server?name="+$("#user_Name").val(),null,function(data){//匿名函数的写法
$("#result").html(data);
});
}

写完之后，就可以愉快的运行啦

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标签： ajax xml 技术 jquery

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