java学习笔记 (5) —— Struts2 监听器配置

1、创建MyListener.java 实现 PreResultLisener 接口

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

public class MyListener implements PreResultListener {

    public void beforeResult(ActionInvocation invocation, String resultCode) {
        System.out.println("result : "+resultCode);
    }

}

2、在拦截器中引入监听器

package com.test.interceptor;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;
import com.test.Listener.MyListener;

public class MyInterceptorMet extends MethodFilterInterceptor {

    private static final long serialVersionUID = 8722841247439200544L;

    @Override
    protected String doIntercept(ActionInvocation invocation) throws Exception {
        invocation.addPreResultListener(new MyListener());
        System.out.println("my interceptor method");
　　　　　// 执行 Action 
        String result = invocation.invoke();
        return result;
    }
}

3、执行顺序

validateDM is invoked —— 先进检验方法
my interceptor method —— 实例化监听器，并没有输出内容
DesignMethod is invoked —— 依然会执行Action方法
result : success —— 如果提交成功返回 success ,否则 返回input