public String intercept(ActionInvocation invocation) throws Exception {-优快云博客

本文介绍了一个自定义的Struts2拦截器MyIntercepter的实现方式，该拦截器主要用于判断用户是否登录。通过ActionInvocation获取上下文信息并进行会话检查，未登录时返回input，已登录则继续执行。

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package app.aop;

import java.util.Map;

import org.apache.struts2.ServletActionContext;

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

@SuppressWarnings("serial")
public class MyIntercepter implements Interceptor {

public void init() {
System.out.println("MyIntercepter 调用了init()方法");
}

public String intercept(ActionInvocation invocation) throws Exception {
System.out.println("MyIntercepter 调用了intercept()方法");
System.out.println("interceptor方法，每次拦截就执行一次");

System.out.println("invocation.getAction()===="+invocation.getAction());
System.out.println("invocation..getProxy().getAction()===="+invocation.getProxy().getAction());
System.out.println("invocation..getProxy().getActionName()===="+invocation.getProxy().getActionName());
System.out.println("invocation.getProxy().getMethod()===="+invocation.getProxy().getMethod());

System.out.println("invocation.getProxy().getNamespace()===="+invocation.getProxy().getNamespace());

System.out.println("invocation.getResult()===="+invocation.getResult());

System.out.println("invocation.getProxy().getMethod()===="+invocation.getProxy().getMethod());

//处理判断是否登录
Map<String,Object> session=ServletActionContext.getContext().getSession();

Object object= session.get("user");

if(object==null){
//未登录
return "input";
}else{
//已登录
String retutunValue=invocation.invoke();

System.out.println("retutunValue==="+retutunValue);

return invocation.invoke();
}
}
public void destroy() {
System.out.println("MyIntercepter 调用了destroy()方法");
}

}