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| 1.客户端网页代码 复制代码 代码如下: <!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> <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('http://10.65.9.181:8090/ajax/checkUser.jsp?user='+userName.value); createRequest('http://10.65.9.181:8090/ajax/checkUser.action?user=' + userName.value); } } </script> <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> 2.服务器端代码 Action类的代码 复制代码 代码如下: package com.action; import java.util.Map; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; import com.xzy.UserDAO; public class CheckUserAction extends ActionSupport{ private String user; public String findUserByName(){ String info = null; UserDAO userdao = new UserDAO(); if(userdao.findUserByName(user)){ //info="用户名已经被注册"; Map map = (Map)ActionContext.getContext().get("request"); map.put("info", "用户名已经被注册"); return "success"; }else{ //info="用户名可以注册"; Map map = (Map)ActionContext.getContext().get("request"); map.put("info", "用户名可以注册使用"); return "fail"; } } public String getUser() { return user; } public void setUser(String user) { this.user = user; } } struts.xml配置 复制代码 代码如下: <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <package name="myPackage" extends="struts-default"> <!-- 定义action --> <action name="checkUser" class = "com.action.CheckUserAction" method="findUserByName"> <!-- 定义处理成功后的映射页面 --> <result >/info.jsp</result> </action> </package> </struts> info.jsp为显示信息页面 复制代码 代码如下: <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%=request.getAttribute("info")%> info.jsp是jsp页面，对于与安卓客户端交互的jsp页面而言，尽量略去不必要的html代码，只需要保留控制编码格式的代码和<%%>之间的处理代码,这样就避免了在安卓客户端显示不必要的垃圾代码，且提高了执行效率，降低了服务器负载。 数据库截图: 最终效果图： |
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