利用Ajax检测用户名是否被占用的完整实例

站长资源 2024/11/15 佚名

35 1538 35

相思资源网 Design By www.200059.com

适合人群：Ajax和jQuery入门

采用Ajax实现用户名验证

使用jQuery给出提示信息

用户注册的时候，使用Ajax实现检测用户名是否已经被注册过，很多细节没有实现，给大家做个简单普及。

<%@ 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>用户注册页面</title>
<script src="/UploadFiles/2021-04-02/jquery.min.js">

下面是ValidateServlet模拟实现，没有做真正的数据库表数据检测，大家自行完成。


package com.ambow.servlet;
 
import java.io.IOException;
import java.io.PrintWriter;
 
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("/ValidateServlet")
public class ValidateServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
 public ValidateServlet() {
  super(); 
 }
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		PrintWriter pw = response.getWriter();
		String account = request.getParameter("account");
		System.out.println("account"+account);
		if("123".equals(account)) {
			pw.print("true");
		}else {
			pw.print("false");
		}
	}
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doGet(request, response);
	}
}

ajax检测用户名,占用,ajax检测用户名重复,ajax判断用户名是否重复

标签：