bookmodifyinterceptor.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.MethodFilterInterceptor;

/**
 * BookModifyInterceptor extends MethodFilterInterceptor
 * when stranger opration Book value Object ,he must be administrator
 * if he isn't,the page redirect to the slogin.jsp
 */

@SuppressWarnings("serial")
public class BookModifyInterceptor extends MethodFilterInterceptor {

	@SuppressWarnings("unchecked")
	@Override
	protected String doIntercept(ActionInvocation invocation) throws Exception {

		Map session = ActionContext.getContext().getSession();

		if (session.get("admin") == null) {			
			return "adminlogin";
		} else {
			return invocation.invoke();
		}

	}

}