文本仪一个实例讲述了struts2+jquery实现ajax登陆的实现方法，具体步骤如下：
一、新建一个web项目，取名test。配置好struts2的环境,并导入jquery的js文件到该项目。
二、在com.action包下，新建一个loginaction.java
loginaction.java的代码如下
package com.action;
import org.apache.struts2.convention.annotation.action;
import org.apache.struts2.convention.annotation.parentpackage;
import org.apache.struts2.convention.annotation.result;
import org.apache.struts2.convention.annotation.results;
import com.opensymphony.xwork2.actionsupport;
@action("login")
@parentpackage(value = "json-default")
@results({ @result(name = "success", type = "json", params = { "data", "flag" }), })
public class loginaction extends actionsupport {
/**
*
*/
private static final long serialversionuid = 1751244794407005783l;
private string flag;
private string username;
private string password;
public string execute() {
try {
if (getusername() == null || getusername().trim().equals("")) {
setflag("用户名不能为空");
return success;
} else if (getpassword() == null || getpassword().trim().equals("")) {
setflag("密码不能为空");
return success;
} else if (getusername().trim().equals("admin")
&& getpassword().equals("admin")) {
setflag("登陆成功");
return success;
} else {
setflag("用户名或密码错误");
return success;
}
} catch (exception e) {
e.printstacktrace();
setflag("登陆异常");
return success;
}
}
public string getflag() {
return flag;
}
public void setflag(string flag) {
this.flag = flag;
}
public string getpassword() {
return password;
}
public void setpassword(string password) {
this.password = password;
}
public string getusername() {
return username;
}
public void setusername(string username) {
this.username = username;
}
}
三、在webroot目录下新建index.jsp和success.jsp
index.jsp为登陆界面，success.jsp为登陆成功后跳转的界面。
index.jsp内容如下：
<%@ page language="java" import="java.util.*" pageencoding="utf-8"%>
<%
string path = request.getcontextpath();
string basepath = request.getscheme() + "://"
+ request.getservername() + ":" + request.getserverport()
+ path + "/";
%>
<!doctype html public "-//w3c//dtd html 4.01 transitional//en">
<html>
<head>
<base href="<%=basepath%>" rel="external nofollow" >
<title>my jsp 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<script type="text/javascript" src="./resource/js/jquery.min.js"></script>
</head>
<script type="text/javascript">
$(document).ready(function() {
$(".loginbutton").click(function() {
var name = $("#username").val();//获取登陆用户名
var password = $("#password").val(); //获取登陆密码
$.post("login", {
username : name,
password : password
}, callback, "json");
});
function callback(data) {
var value=data.flag;
if(value=="登陆成功"){
location.href="./success.jsp" rel="external nofollow" ;
}else{
alert(value);
}
});
</script>
<body>
<input name="username" id="username" type="text" />
<input name="password" id="password" type="password" />
<button class="loginbutton" class="btn btn-inverse">登陆</button>
</body>
</html>
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