<%@ 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> <style type="text/css"> <!-- #toolTip{ position: absolute; left: 311px; top: 39px; 98px; height: 48px; padding-top: 45px; padding-left: 25px; padding-right: 25px; z-index: 1; display: none; color: red; background-image: url(images/tooltip.jpg); } --> </style> </head> <body> <form action="" method="post" name="form1"> 用户名：<input name="username" type="text" id="username" size="32"> <img src="images/checkBt.jpg" width="104" height="23" style="cursor: hand;" onclick="checkUser(form1.username);"><br><br> 密 码：<input name="password1" type="text" id="password1" size="35" onclick="checkUser(form1.username);"><br><br> 确认密码:<input name="passowrd2" type="text" id="password2" size="35"><br><br> E-mail :<input name="email" type="text" id="email" size="35"> <input type="image" name="imageField" src="images/registerBt.jpg"> </form> <div id="toolTip"></div> </body> </html> <script language="javascript"> function createRequest(url) { http_request = false; if (window.XMLHttpRequest) { // 非IE浏览器 http_request = new XMLHttpRequest(); //创建XMLHttpRequest对象 } else if (window.ActiveXObject) { // IE浏览器 try { http_request = new ActiveXObject("Msxml2.XMLHTTP"); //创建XMLHttpRequest对象 } catch (e) { try { http_request = new ActiveXObject("Microsoft.XMLHTTP"); //创建XMLHttpRequest对象 } catch (e) {} } } if (!http_request) { alert("不能创建XMLHttpRequest对象实例！"); return false; } http_request.onreadystatechange = getResult; //调用返回结果处理函数 http_request.open('GET', url, true); //创建与服务器的连接 http_request.send(null); //向服务器发送请求 } function getResult() { if (http_request.readyState == 4) { // 判断请求状态 if (http_request.status == 200) { // 请求成功，开始处理返回结果 document.getElementById("toolTip").innerHTML=http_request.responseText; //设置提示内容 document.getElementById("toolTip").style.display="block"; //显示提示框 } else { // 请求页面有错误 alert("您所请求的页面有错误！"); } } } function checkUser(userName){ if(userName.value==""){ alert("请输入用户名！");userName.focus();return; }else{ createRequest('checkUser.jsp?user='+userName.value); } } </script>
1 <%@page import="java.util.Arrays"%> 2 <%@ page language="java" contentType="text/html; charset=UTF-8" 3 pageEncoding="UTF-8"%> 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 5 <html> 6 <head> 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 8 <title>Insert title here</title> 9 </head> 10 <body> 11 <% 12 String[] userList={"123456","111111"}; 13 String user = new String(request.getParameter("user").getBytes("ISO-8859-1"),"UTF-8"); 14 Arrays.sort(userList); 15 int result = Arrays.binarySearch(userList, user); 16 if(result>-1){ 17 out.println("很抱歉，该用户名已经被注册！"); 18 }else{ 19 out.println("恭喜您，该用户名没有被注册！"); 20 } 21 %> 22 </body> 23 </html>