struts2+jquery 实现ajax登陆

一、新建一个web项目：test,配置好struts2的环境(详细配置见：http://www.cnblogs.com/wuweidu/p/3841297.html)

导入Jquery的js文件到项目

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登陆界面 success.jsp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%>">

<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";
            }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>