shoppinginterceptor.java

有简单的网上书店需求及设计流程

package org.wiely.interceptor;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;


/**
 * ShoppingInterceptor implements Interceptor,
 * when the visitors use shoppingAciotn,if he is not user,the page 
 * redirect the index.jsp
 */
@SuppressWarnings("serial")
public class ShoppingInterceptor implements Interceptor {

	@Override
	public void destroy() {		

	} 

	@Override
	public void init() {		

	}

	@SuppressWarnings("unchecked")
	@Override
	public String intercept(ActionInvocation invocation) throws Exception {
		
		    Map session = ActionContext.getContext().getSession();
		    
		    if(session.get("user")==null){
		    	return "userlogin";
		    }else{
		    	return invocation.invoke();
		    }
		
	}

}