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ajax--检验用户是否存在

2015-08-23 13:08 323 查看

ValiateUserNameServlet

package com.yucheng.ajax.servlets;

import java.io.IOException;
import java.lang.ProcessBuilder.Redirect;
import java.util.Arrays;
import java.util.List;

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("/valiateUserName")
public class ValiateUserNameServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

List<String> userNames=Arrays.asList("AAA","BBB","CCC");
String userName=request.getParameter("userName");
String result="";

if(userNames.contains(userName)){

result="<font color='red'>该用户已经存在</font>";
}else{

result="<font color='green'>该用户可以使用</font>";
}

response.setCharacterEncoding("UTF-8");
response.setContentType("text/html");
response.getWriter().print(result);
}

}

index.jsp

<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="${pageContext.request.contextPath}/scripts/jquery-1.7.2.js"></script>
<script type="text/javascript">
$(function(){
$(":input[name='userName']").change(function(){

var val=$(this).val();
val=$.trim(val);

if(val !=""){
var url="${pageContext.request.contextPath}/valiateUserName";
var args={"userName":val,"time":new Date()};

$.post(url,args,function(data){

$("#message").html(data);
});
}

return false;
});
})

</script>
</head>
<body>
<form action="" method="post">
用户名:<input type="text" name="userName"/>
<br>
<div id="message"></div>
<br>
<input type="submit" value="提交"/>
</form>
</body>
</html>

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