一个 struts2 入门级的小事例 (Action , 拦截器使用)

myeclipse5.5 + tomcat5.5 + jdk1.5    需要的朋友可以直接下载看看 ^_^ ...

首先是  actions 包里的类 (2个 action ,一个拦截器)

1.CheckLoginInterceptor

/*************************************************
 @Copyright (C), 2008, lzpeng 
 @File name:      CheckLoginInterceptor.java
 @Author:         lzpeng
 @CreateDate:     2008-6-17 
 @Description:    CheckLoginInterceptor拦截器 
 @Extends:        AbstractInterceptor   
 
 @Function List: 
 1. public String intercept()
 *************************************************/

package cn.com.lzpeng.actions;

import java.util.Map;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class CheckLoginInterceptor extends AbstractInterceptor {

	private static final long serialVersionUID = 1L;
	public static final String USER_SESSION_KEY="user";  

	@Override
	public String intercept(ActionInvocation actionInvocation) throws Exception {
		System.out.println("begin check login interceptor");

		// 对LoginAction不做该项拦截
		Object action = actionInvocation.getAction();
		if (action instanceof LoginAction) {
			System.out
					.println("exit check login, because this is login action.");
			return actionInvocation.invoke();
		}
		// 验证 session
		Map session = actionInvocation.getInvocationContext().getSession();
		String username = (String) session.get(USER_SESSION_KEY);

		if (username != null) {
			// 存在的情况下进行后续操作。
			System.out.println(username+" already login!");
			return actionInvocation.invoke();
		} else {
			// 否则终止后续操作，返回LOGIN
			System.out.println("no login, forward login page!");

			return Action.LOGIN;

		}

	}

}

2.LoginAction

/*************************************************
 @Copyright (C), 2008, lzpeng 
 @File name:      LoginAction.java
 @Author:         lzpeng
 @CreateDate:     2008-6-17 
 @Description:    LoginAction控制类    
 @Extends:        ActionSupport   
 
 @Function List: 
 1. public UserBean getUserBean()
 返回一个UserBean实体
 2. public void setUserBean(UserBean userBean) 
 设置一个UserBean实体
 3. public String execute()
 执行Action的方法
 4.public void setSession()
 设置 session 值
 *************************************************/

package cn.com.lzpeng.actions;

import com.opensymphony.xwork2.ActionSupport;
import cn.com.lzpeng.entity.UserBean;
import java.util.Map;
import org.apache.struts2.interceptor.SessionAware;

public class LoginAction extends ActionSupport implements SessionAware {
	private static final long serialVersionUID = 1L;

	private UserBean userBean;

	private Map<String, String> session;

	public UserBean getUserBean() {
		return userBean;
	}

	public void setUserBean(UserBean userBean) {
		this.userBean = userBean;
	}

	@Override
	public String execute() {
		if (userBean == null) {
			return LOGIN;
		}

		String name = userBean.getName();
		String pwd = userBean.getPassword();

		session.put(CheckLoginInterceptor.USER_SESSION_KEY, name);

		if (name.equals("java") && pwd.equals("struts")) {
			return SUCCESS;
		} else {
			return ERROR;
		}

	}

	
	public void setSession(Map session) {
		this.session = session;
	}

}

3.TestInterceptorAction   

/*************************************************
 @Copyright (C), 2008, lzpeng 
 @File name:      LoginAction.java
 @Author:         lzpeng
 @CreateDate:     2008-6-17 
 @Description:    TestInterceptorAction控制类    
 @Extends:        ActionSupport   
 
 @Function List: 
 1.public String execute()
 执行 Action 的方法
 *************************************************/

package cn.com.lzpeng.actions;

import com.opensymphony.xwork2.ActionSupport;

public class TestInterceptorAction extends ActionSupport {

	private static final long serialVersionUID = 1L;

	@Override
	public String execute() {
		return SUCCESS;
	}

}

这个是实体类 UserBean.java

/*************************************************
 @Copyright (C), 2008, lzpeng 
 @File name:      LoginAction.java
 @Author:         lzpeng
 @CreateDate:     2008-6-17 
 @Description:    UserBean实体类    
 *************************************************/

package cn.com.lzpeng.entity;

public class UserBean {
	private String name;

	private String password;

	public void setName(String name) {
		this.name = name;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public String getName() {
		return name;
	}

	public String getPassword() {
		return password;
	}

}

struts.xml

<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>
	<!-- 加载默认的 struts2 配置文件 -->
	<include file="struts-default.xml" />
	<!-- 继承默认的 struts2 配置文件 -->
	<package name="default" extends="struts-default">
		<!-- 定义一个名为 checkLogin 的拦截器 -->
		<interceptors>
			<!-- 定义权限检查拦截器 -->
			<interceptor name="checkLogin"
				class="cn.com.lzpeng.actions.CheckLoginInterceptor" />
			<!-- 定义一个包含权限检查的拦截器栈 -->
			<interceptor-stack name="myDefaultStack">
				<!-- 定义拦截器栈包含checkLogin拦截器 -->
				<interceptor-ref name="checkLogin"></interceptor-ref>
				<interceptor-ref name="defaultStack"></interceptor-ref>
			</interceptor-stack>
		</interceptors>
		<!-- 设置全局 全局默认的拦截器栈-->
		<default-interceptor-ref name="myDefaultStack"></default-interceptor-ref>

		<!-- 定义全局Result -->
		<global-results>
			<!-- 当返回login视图名时，转入/login.jsp页面 -->
			<result name="login">/login.jsp</result>
		</global-results>

		<!--    
			action 标签里 name属性代表我们要处理的.action的前面部分   
			action 标签里 class属性代表我们需要哪个类来处理   
			result 标签的 name属性代表action类的执行方法的返回值,   
			action类的默认执行方法是public String execute()  
		-->
		<action name="login"
			class="cn.com.lzpeng.actions.LoginAction">
			<result name="success">success.jsp</result>
			<result name="error">error.jsp</result>
			<result name="login">login.jsp</result>
			<!--拦截器一般配置在 result 元素之后  -->
			<interceptor-ref name="myDefaultStack" />
		</action>

		<action name="testInterceptor"
			class="cn.com.lzpeng.actions.TestInterceptorAction">
			<result name="success">content.jsp</result>
			<result name="login">login.jsp</result>
		</action>




	</package>
</struts>

最后是 4个 jsp界面

login.jsp

<%@ 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>struts2</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">
		<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
	</head>

	<body>
		<!—-
		注意这里action="login.action"
		因为要与Struts.xml里你注册的那个别名叫"login"
	   -->
		<form action="login.action" method="post" >
			<fieldset>
				<legend>
					用户登录
				</legend>
				<p align="center">
					帐 号:
					<input type="text" name="userBean.name"  />
					<!—-
					注意这里一定要写name="bean.name",
					因为要与LoginAction.java里面定义的bean对应
					name是它的helloWorld的属性
				    -->
				</p>
				<p align="center">
					密 码:
					<input type="password" name="userBean.password" />
				</p>
				<p align="center">
					<input type="submit" value="登 录" />
				</p>
			</fieldset>
		</form>
	</body>
</html>

success.jsp

<%@ 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>成功了</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">
		<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

	</head>

	<body>
		<form action="testInterceptor.action">
			<div align="center">
				恭喜${userBean.name}登录成功了 ！
				<br>
				只有通过这才能访问 content.jsp!
				<br>
				<br>
				<input type="submit" value=" content.jsp">
				<br>
				<br>
				主要演示拦截器 CheckLoginInterceptor 对 TestInterceptorAction 的拦截情况(可以试直接访问
				TestInterceptorAction.action)
			</div>
		</form>
	</body>
</html>

 error.jsp

<%@ 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>error</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">
		<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

	</head>

	<body>
		<div align="center">
			这是一个错误界面 ！	用以下帐号试试:<br>
			id   : java<br>
			password:  struts
		</div>
		<div>
		    <a href="login.jsp">返回登录界面</a>
		</div>

	</body>
</html>

content.jsp    //为测试 拦截器 写的

<%@ 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>content</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">
		<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

	</head>

	<body><div align="center">
		这里是 content.jsp!
		<br>
		成功通过拦截器 CheckLoginInterceptor......
		<br>
		复制上边地址 ， 在新打开的窗口里粘贴 ， 回车试试......
		</div>
	</body>
</html>

26 楼 z_9400 2012-01-10  

http://localhost:8080/struts2_base/content.jsp  输到地址栏就可以访问了