messageaction.java

java学习的必要的资料,servlet的说明很好

package com.estore.struts.action;

import java.util.Collection;
import java.util.HashSet;
import java.util.Set;

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

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.MappingDispatchAction;

import com.estore.struts.Globals;
import com.estore.struts.entity.Message;
import com.estore.struts.service.MessageService;
import com.estore.struts.utils.ServiceFactory;

public class MessageAction extends MappingDispatchAction{
	private static MessageService messageService;
	static {
		messageService = (MessageService) ServiceFactory.getInstance()
				.getService(Globals.MESSAGE_SERVICE);
	}
	
	public ActionForward addMessage(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response) {
		ActionForward forward = mapping.findForward("error");

		String tile =  request.getParameter("tile");
		String content = request.getParameter("content");
		
		Message message=new Message();
		message.setTile(tile);
		message.setContent(content);
		try {
			messageService.addMessage(message);
	
			Collection messages = messageService.findAll();
			request.getSession().setAttribute("messages", messages);
	
			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
		}
		
		return forward;
       }
	
	public ActionForward messageList(ActionMapping mapping,
			ActionForm form, HttpServletRequest request,
			HttpServletResponse response) {
		ActionForward forward = mapping.findForward("error");

		try {
			Collection messages = messageService.findAll();

			HttpSession session = request.getSession();
			session.setAttribute("messages", messages);

			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
		}

		return forward;
	}
	
	public ActionForward deleteMessage(ActionMapping mapping,
			ActionForm form, HttpServletRequest request,
			HttpServletResponse response) {
		ActionForward forward = mapping.findForward("error");

		try {
			Integer MessageId=Integer.valueOf(request.getParameter("messageId"));
			Message message=messageService.findMessageById(MessageId);
			
			messageService.remove(message);
			
			Collection messages = messageService.findAll();

			HttpSession session = request.getSession();
			session.setAttribute("messages", messages);

			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
		}

		return forward;
	}
	
	public ActionForward admMessageList(ActionMapping mapping,
			ActionForm form, HttpServletRequest request,
			HttpServletResponse response) {
		ActionForward forward = mapping.findForward("error");

		try {
			Collection messages = messageService.findAll();

			HttpSession session = request.getSession();
			session.setAttribute("messages", messages);

			forward = mapping.findForward("success");
		} catch (Exception e) {
			e.printStackTrace();
		}

		return forward;
	}
}