Struts2学习之拦截器栈

拦截器栈：

　　- 从结构上看：拦截器栈相当于多个拦截器的组合

　　- 从功能上看：拦截器栈也是拦截器

默认拦截器栈：

　　- 在struts-core.jar中的struts-default.xml中自定义了一个default拦截器栈，并且将其指定为默认拦截器栈

　　- 只要定义包的过程中继承struts-default包，那么默认defaultStack将是默认的拦截器

　　- 当为包中的某个action显示指定了某个拦截器，那么默认的拦截器将不会生效

　　- 拦截器栈中的各个拦截器的顺序很重要（一般讲默认拦截器器栈放在前面）

实例:

1.项目结构

2.pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  	<modelVersion>4.0.0</modelVersion>

	<groupId>org.struts</groupId>

	<artifactId>Struts2-AuthInterceptor</artifactId>

	<packaging>war</packaging>

	<version>0.0.1-SNAPSHOT</version>

	<properties>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

		<struts.version>2.5.10</struts.version>

	</properties>

	<dependencies>

		<!-- Junit -->

		<dependency>

			<groupId>junit</groupId>

			<artifactId>junit</artifactId>

			<version>4.12</version>

			<scope>test</scope>

		</dependency>

		<!-- Struts2 -->

		<dependency>

		    <groupId>org.apache.struts</groupId>

		    <artifactId>struts2-core</artifactId>

		    <version>${struts.version}</version>

		</dependency>

	</dependencies>

	<build>

		<finalName>Struts2-AuthInterceptor</finalName>

	</build>

</project>

3.web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"

  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

  version="3.0" metadata-complete="true">

	<!-- 首页 -->

	<welcome-file-list>

		<welcome-file>login.jsp</welcome-file>

	</welcome-file-list>

	<!-- Struts2过滤器 -->

	<filter>

		<filter-name>struts2</filter-name>

		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>

	</filter>

	<filter-mapping>

		<filter-name>struts2</filter-name>

		<url-pattern>/*</url-pattern>

	</filter-mapping>

</web-app>

4.login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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=UTF-8">

<title>用户登录</title>

</head>

<body>

	<form action="login" method="post">

		<font color="red">${loginError }</font><br/>

		用户名：<input type="text" name="username"/><br/>

		密   码：<input type="password" name="password"/><br/>

		<input type="submit" value="登录"/>

		<input type="reset" value="重置"/>

	</form>

</body>

</html>

5.manager.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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=UTF-8">

<title>管理界面</title>

</head>

<body>

	欢迎进入管理页面，该页面只有登录用户才能访问！

</body>

</html>

6.LoginAction.java

package org.struts.action;

import java.util.Map;

import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport implements SessionAware {

	private static final long serialVersionUID = 1L;

	private String username;// 用户名

	private String password;// 密码

	private Map<String, Object> session;// Session

	@Override

	public String execute() throws Exception {

		if ("admin".equals(username) && "123456".equals(password)) {

			session.put("userInfo", username);

			session.remove("loginError");

			return SUCCESS;

		} else {

			session.put("loginError", "用户名或密码错误");

			session.remove("userInfo");

			return "login";

		}

	}

	public void setSession(Map<String, Object> session) {

		this.session = session;

	}

	public String getUsername() {

		return username;

	}

	public void setUsername(String username) {

		this.username = username;

	}

	public String getPassword() {

		return password;

	}

	public void setPassword(String password) {

		this.password = password;

	}

}

7.AuthInterceptor.java

package org.struts.interceptor;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class AuthInterceptor extends AbstractInterceptor {

	private static final long serialVersionUID = 1L;

	@Override

	public String intercept(ActionInvocation invocation) throws Exception {

		// 获取session

		ActionContext context = ActionContext.getContext();

		Map<String, Object> session = context.getSession();

		if (session.get("userInfo") != null) { // 登录成功

			String result = invocation.invoke();

			return result;

		} else {// 未登录

			session.put("loginError", "请先登录");

			return "login";

		}

	}

}

8.struts.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"

    "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>

	<package name="default" extends="struts-default" namespace="/">

		<!-- 注册拦截器 -->

		<interceptors>

			<interceptor name="auth" class="org.struts.interceptor.AuthInterceptor"/>

			<interceptor-stack name="authStack">

				<interceptor-ref name="defaultStack"/>

				<interceptor-ref name="auth"/>

			</interceptor-stack>

		</interceptors>

		<!-- 通过此Action访问后台管理页面 -->

		<action name="auth">

			<result>/WEB-INF/view/manager.jsp</result>

			<result name="login">/login.jsp</result>

			<interceptor-ref name="authStack"/>

		</action>

		<action name="login" class="org.struts.action.LoginAction">

			<result>/WEB-INF/view/manager.jsp</result>

			<result name="login">/login.jsp</result>

		</action>

	</package>

</struts>

9.结果预览

　　9.1 未登录直接访问

　　9.2 登录成功

　　9.3 登录成功后访问

参考：http://www.imooc.com/video/9102

巴特西

Struts2学习之拦截器栈

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