ajax交互Struts2的action(1)

1.客户端网页代码

<!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>

值得注意的是此处核心代码：

//createRequest('http://10.65.9.181:8090/ajax/checkUser.jsp?user='+userName.value);//与jsp页面交互，可能不通过数据库
createRequest('http://10.65.9.181:8090/ajax/checkUser.action?user='+ userName.value);//与struts交互，通过后台处理。

注意此处的写法。

2.服务器端代码

Action类的代码

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

<?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

<%@ 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：

原文链接：https://www.f2er.com/ajax/165958.html

ajax交互Struts2的action(1)

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