struts2_Action的三种实现方式

package com.ahd.action;

public class HelloAction{
    public String execute() throws Exception {
        return "SUCCESS";
    }
}

package com.ahd.action;

import com.opensymphony.xwork2.ActionSupport;

public class HelloAction extends ActionSupport{
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        return "SUCCESS";
    }
}

package com.ahd.action;

import com.opensymphony.xwork2.Action;

public class HelloAction implements Action{
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        return Action.SUCCESS;
    }
}