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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
