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ajax交互Struts2的action(客戶端/服務(wù)器端)

 更新時(shí)間：2013年08月14日 17:52:46   作者：  
本文為大家探討下ajax交互Struts2的action并有客戶端及服務(wù)器端代碼，感興趣的朋友可以參考下，希望對大家有所幫助
1.客戶端網(wǎng)頁代碼
復(fù)制代碼 代碼如下:

<!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>檢測用戶名是否唯一</title>
<script language="javascript">
function createRequest(url) {
http_request = false;
if (window.XMLHttpRequest) { // 非IE瀏覽器
http_request = new XMLHttpRequest(); //創(chuàng)建XMLHttpRequest對象
} else if (window.ActiveXObject) { // IE瀏覽器
try {
http_request = new ActiveXObject("Msxml2.XMLHTTP"); //創(chuàng)建XMLHttpRequest對象
} catch (e) {
try {
http_request = new ActiveXObject("Microsoft.XMLHTTP"); //創(chuàng)建XMLHttpRequest對象
} catch (e) {
}
}
}
if (!http_request) {
alert("不能創(chuàng)建XMLHttpRequest對象實(shí)例！");
return false;
}
http_request.onreadystatechange = getResult; //調(diào)用返回結(jié)果處理函數(shù)
http_request.open('GET', url, true); //創(chuàng)建與服務(wù)器的連接
http_request.send(null); //向服務(wù)器發(fā)送請求
}
function getResult() {
if (http_request.readyState == 4) { // 判斷請求狀態(tài)
if (http_request.status == 200) { // 請求成功，開始處理返回結(jié)果
document.getElementById("toolTip").innerHTML = http_request.responseText; //設(shè)置提示內(nèi)容
document.getElementById("toolTip").style.display = "block"; //顯示提示框
} else { // 請求頁面有錯(cuò)誤
alert("您所請求的頁面有錯(cuò)誤！");
}
}
}
function checkUser(userName) {
if (userName.value == "") {
alert("請輸入用戶名！");
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>用戶名：</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>密碼：</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>確認(rèn)密碼：</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.服務(wù)器端代碼
Action類的代碼
復(fù)制代碼 代碼如下:

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="用戶名已經(jīng)被注冊";
Map map = (Map)ActionContext.getContext().get("request");
map.put("info", "用戶名已經(jīng)被注冊");
return "success";
}else{
//info="用戶名可以注冊";
Map map = (Map)ActionContext.getContext().get("request");
map.put("info", "用戶名可以注冊使用");
return "fail";
}
}

public String getUser() {
return user;
}

public void setUser(String user) {
this.user = user;
}
}

struts.xml配置
復(fù)制代碼 代碼如下:

<?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">
<!-- 定義action -->
<action name="checkUser" class = "com.action.CheckUserAction" method="findUserByName">
<!-- 定義處理成功后的映射頁面 -->
<result >/info.jsp</result>
</action>
</package>
</struts>

info.jsp為顯示信息頁面
復(fù)制代碼 代碼如下:

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%=request.getAttribute("info")%>

info.jsp是jsp頁面，對于與安卓客戶端交互的jsp頁面而言，盡量略去不必要的html代碼，只需要保留控制編碼格式的代碼和<%%>之間的處理代碼,這樣就避免了在安卓客戶端顯示不必要的垃圾代碼，且提高了執(zhí)行效率，降低了服務(wù)器負(fù)載。
數(shù)據(jù)庫截圖:
 
最終效果圖：

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