selectservlet.java

通过jsp,servlet,javaBean,三成架构实现的好友通讯录系统

package com.servelet;

import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;

import com.Dao.bookDao;
import com.entity.UserBean;


public class SelectServlet extends HttpServlet {
    private static final String CONTENT_TYPE = "text/html; charset=GBK";

    //Initialize global variables
    public void init() throws ServletException {
    }

    //Process the HTTP Get request
    public void doGet(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        response.setContentType(CONTENT_TYPE);
        ArrayList list=findBooks(request);
        request.setAttribute("books",list);
        request.getRequestDispatcher("displayBook.jsp").forward(request, response);
            }
        public ArrayList findBooks(HttpServletRequest request)
       {
            HttpSession session=request.getSession();
            UserBean user=(UserBean)session.getAttribute("user");
            int relation=Integer.parseInt(request.getParameter("relation"));
            ArrayList list=null;
            bookDao bookdao=new bookDao();
            if(relation==0)
            {
                    list=bookdao.findBookByUserId(user.getUserId());
            }else
            {
                    list=bookdao.findBookRelationById(user.getUserId(),relation);
            }
            return list;

       }

    //Process the HTTP Post request
    public void doPost(HttpServletRequest request, HttpServletResponse response) throws
            ServletException, IOException {
        doGet(request, response);
    }

    //Clean up resources
    public void destroy() {
    }
}