Struts2 拦截器

package com.test.filter;

import java.util.Map;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class LoginInterceptor extends AbstractInterceptor {
	
	
	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		String username = null; 
		String password = null;
		
		// 取得请求相关的ActionContext实例
		ActionContext ctx = invocation.getInvocationContext();
		Map session = ctx.getSession();
		String user = (String) session.get("username");
		
		 Map<String, Object> inputMap = ctx.getParameters();  
		 
		 if(inputMap == null){
			 System.out.println("Map is Null");
		 }
		 
		 for(Map.Entry<String,Object> entry :inputMap.entrySet() ){
			 String key = entry.getKey();
			 System.out.println("Key:"+key);
			 
			 Object value = entry.getValue();  
			 if (value instanceof String[]) { 
				 String[] str = (String[]) value;
				 if(str.length>= 1){
					 if(str[0] != null && (key=="username"|| key.equals("username"))){
						 username = str[0];
					 }
					 if(str[0] != null && (key=="password"|| key.equals("password"))){
						 password = str[0];
					 }
				 }
				 /*for(int i=0; i < str.length ; i++){
					 System.out.println(str[i]);
				 }*/
				 
			 }
		 }
		// 如果没有登陆，即用户名不存在，都返回重新登陆
/*		System.out.println("user:" + user);
		if (user != null) {
			System.out.println("test");
			return invocation.invoke();
		}*/
		 
		 if(username != null && password != null){
				System.out.println("test");
				return invocation.invoke();
		 }
		System.out.println("你还没有登录");
		ctx.put("tip", "你还没有登录");
		return Action.LOGIN; // 返回一个叫login的result结果
	}

}

 Struts.xml

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

		<interceptors>
			<interceptor name="authority" class="com.sf.test.filter.LoginInterceptor" />

			<!-- 拦截器栈 作用：可能让Struts2默认的拦截器和自定议的拦截器都能使用 -->
			<interceptor-stack name="mydefault">
				<interceptor-ref name="defaultStack" />
				<interceptor-ref name="authority" />
			</interceptor-stack>
		</interceptors>

		<!-- 配置默认的拦截器 -->
		<default-interceptor-ref name="mydefault" />

		<default-action-ref name="index" />

		<!-- 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 name="show" class="com.test.action.Login2Action"
			method="Login2">
			<result name="success">/success.jsp</result>
			<!-- 使用此拦截器-->
			<interceptor-ref name="mydefault" /> 
		</action>

package包中  配置标签是有顺序的：

 

result-types
interceptors
default-interceptor-ref
default-action-ref
default-class-ref
global-results
global-exception-mappings
action*(就是所有的action放到最后)

 

Action

public class Login2Action extends ActionSupport {

	private String username;
	private String password;

	public String Login2() {
		
		if(username.equals("a") && password.equals("b")){
			System.out.println("success:"+username);
			return "success";
		}
		return Action.ERROR;
	}

	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;
	}
}