先给大家展示下效果图，然后再给大家撸代码，效果图如下所示：
下面写一个简单的例子，检测用户名是否唯一（直接撸代码）：
前端界面：
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%><!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=GB18030"><title>检测用户名是否唯一</title><style type="text/css"><!--#toolTip { position:absolute; left:331px; top:39px; width: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 style="margin: 0px;"><form method="post" action="" name="form1"><table width="509" height="352" border="0" align="center" cellpadding="0" cellspacing="0" background="images/bg.gif"> <tr> <td height="54"> </td> </tr> <tr> <td height="253" valign="top"> <div style="position:absolute;"> <table width="100%" height="250" border="0" cellpadding="0" cellspacing="0"> <tr> <td width="18%" height="54" align="right" style="color:#8e6723 "><b>用户名：</b></td> <td width="49%"><input name="username" type="text" id="username" size="32"></td> <td width="33%"><img src="images/checkBt.jpg" width="104" height="23" style="cursor:hand;" onClick="checkUser(form1.username);"></td> </tr> <tr> <td height="51" align="right" style="color:#8e6723 "><b>密码：</b></td> <td><input name="pwd1" type="password" id="pwd1" size="35"></td> <td rowspan="2"> <div id="toolTip"></div></td> </tr> <tr> <td height="56" align="right" style="color:#8e6723 "><b>确认密码：</b></td> <td><input name="pwd2" type="password" id="pwd2" size="35"></td> </tr> <tr> <td height="55" align="right" style="color:#8e6723 "><b>E-mail：</b></td> <td colspan="2"><input name="email" type="text" id="email" size="45"></td> </tr> <tr> <td> </td> <td colspan="2"><input type="image" name="imageField" src="images/registerBt.jpg"></td> </tr> </table> </div> </td> </tr> <tr> <td> </td> </tr></table></form></body></html>
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