ACTION

最新推荐文章于 2022-08-28 11:34:18 发布

转载最新推荐文章于 2022-08-28 11:34:18 发布 · 350 阅读

文章标签：

#import #exception #string #action #login #class

本文介绍了一个基于Struts框架的自定义Action抽象类AdmitAction，该类实现了用户登录验证及页面转发功能。文章详细展示了AdmitAction类的结构、方法实现以及如何与Struts配置文件配合工作。

/*
* 项目名：北京五岳管理系统
* 副系统名：继承自stucts的Action抽象类

* class名：AdmitAction.java
* version ：1.0
* 日期：2005/07/06
* 著作权：Copyright beijingwuyue 2005, All rights reserved.
*/
package admit.action;

import admit.form.AdmitForm;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.util.MessageResources;

/**
* Title: AdmitAction.java
* Description: 继承自stucts的Action抽象类
* Copyright: Copyright (c) 2005
* Company: 五岳
*
* @author gongjian
* @version 1.0
*/
public abstract class AdmitAction extends Action {

//定义Log日志对象,在子类中可以直接使用
protected Log log = LogFactory.getLog(this.getClass());

//定义一个Request对象

private HttpServletRequest requestHandler;

/*
* 重写structs包的方法,用final关键字修饰之后无法在子类被重写
*
* @see org.apache.struts.action.Action#execute(org.apache.struts.action.ActionMappinaaorg.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
*/
public final ActionForward execute(
  ActionMapping mapping,
  ActionForm form,
  HttpServletRequest request,
  HttpServletResponse response) {

  requestHandler=request;
  log.debug("-= execute start=-");
  //forward
  ActionForward forward = null;

  try {

      //从ActionForm中提取数据
   AdmitForm admitForm = (AdmitForm) form;

   AdmitActionContext context = new AdmitActionContext(request);

   String result = "";

   //登陆
   if (CheckLogin(context)) {
    result = this.execute(admitForm, context);
   }
   //没有登陆
   else {
    result = "error";
   }

   //根据result在structs-config.xml文件中寻找相对应的路径和文件
   forward = mapping.findForward(result);

  } catch (Exception e) {
   log.error(e);
   forward = mapping.findForward("error");
  }

log.debug("-= execute end =-");

  return forward;
}

/**
* 抽象类,子类使用,返回确定转向的字符串
*
* @param Form ActionForm
* @param context ActionContext
* @return String 用于转向的字符串
* @throws Exception
*/
public abstract String execute(AdmitForm form, AdmitActionContext context)
  throws Exception;

/**
* 检查用户是否登陆
*
* @param context ActionContext
* @return true    用户已经登陆
*               false 用户没有登陆
*/
public boolean CheckLogin(AdmitActionContext context) {

  String login = (String)context.getSessionData("login");
  if ("1".equals(login)) {
   return true;
  } else {
   return false;
  }
}

/**
*
* @return
*/
public MessageResources getMessageResources(){
  return getResources(requestHandler);
}
}