這是一個WEB項目，需要在網頁上顯示，只是初學，沒有涉及到后面一些東西。我把添加用戶的代碼放在了下面，用Myeclipse寫的，我想加上Ajax讓他注冊不能重名，該在哪里做出修改呢？先謝謝大家了這個是userAdd.jsp 增加用戶的頁面<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>無標題文檔</title><link href="css/style.css" rel="stylesheet" type="text/css" /></head> </head> <body> <div class="place"> <span>位置：</span> <ul class="placeul"> <li><a href="index.jsp">首頁</a></li> <li><a href="#">添加賬戶</a></li> </ul> </div> <div class="formbody"> <div class="formtitle"> <span>基本信息</span> </div> <div class="formbody"> <form action="<%=path%>/servlet/UserAddServlet" method="post" ><ul class="forminfo"> <li><label> 用戶名:</label><input name="uname" type="text" class="dfinput" ></li> <li><label> 密碼：</label><input name="upass" type="password" class="dfinput" ></li> <li><label > 權限:</label></li> <li><label style="margin-left: 150px">財務</label><input type="radio" name="quanxian" value="財務" checked="checked" style="margin-top: 12px" /></li> <li><label style="margin-left: 150px">人事</label><input type="radio" name="quanxian" value="人事" style="margin-top: 10px" /></li> <li><label> </label><input name="" type="submit" class="btn" value="確認保存" /></li></ul> </form> </div> </body></html>下面這個是UserAddServlet 后臺操作數據package com.xx.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.xx.bean.User;import com.xx.dao.UserDao;
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