messageservice.java

来自「基于j2ee的物流软件」· Java 代码 · 共 55 行

package com.wuliu.doservlet;

import java.util.List;

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

import com.wuliu.dao.MessageInfoDAO;
import com.wuliu.entity.MessageInfo;

public class MessageService implements Service {

	public String doService(HttpServletRequest request,
			HttpServletResponse response) {
		String path = null;
		String action = request.getParameter("action");
		MessageInfoDAO mid = new MessageInfoDAO();
		if(action == null){
			final int pageSize = 10;
			int num = 0;
			int maxNum = mid.getpageNum(pageSize);
			
			if(request.getParameter("num") != null){
				num = Integer.parseInt(request.getParameter("num"));
			}
			String leaf = request.getParameter("leaf");
			if(leaf != null && leaf.equals("previous")){
				num = num - 1;
				if(num < 0){
					num = 0;
					request.setAttribute("prompt", "此页已经是第一页!");
				}
			}else if(leaf != null && leaf.equals("next")){
				num = num + 1;
				if(num >= maxNum){
					num = maxNum - 1;
					request.setAttribute("prompt", "此页已经是最后一页!");
				}
			}else if(leaf != null && leaf.equals("last")){
				num = maxNum - 1;
			}else if(leaf != null && leaf.equals("page")){
				num = num - 1;
			}
			request.setAttribute("pagesize", pageSize);
			request.setAttribute("num", num);
			request.setAttribute("maxnum", maxNum);
			
			List<MessageInfo> list = mid.selectMessagePage(pageSize, num);
			request.setAttribute("list", list);
			path = "admin/message/message.jsp";
		}
		return path;
	}
}