noteservlet.java

jsp+servlet网上购物,是一个实现mvc的网站

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package com.ebook.servlet;

import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.ebook.Entity.*;
import com.ebook.impl.*;
import com.ebook.Util.*;
import javax.servlet.http.HttpSession;

public class NoteServlet extends HttpServlet {

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String action = request.getParameter("action");
        if (action.equals("addnote")) {
            addNote(request, response);
        } else if (action.equals("shownote")) {
            showNote(request, response);
        }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

    public void showNote(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            int currentpage=1;
            if(request.getParameter("cpage")!=null)
            {
              currentpage=Integer.parseInt(request.getParameter("cpage"));
            }
           NoteImpl ni = new NoteImpl(new JdbcCon().getCon());
            List list = ni.getNote();
            PageHoder ph = new PageHoder(list, 5);
            List pagelist = ph.getCurrentList(currentpage);
            int allpages = ph.getPageNumber(5);
            request.setAttribute("currentpage", currentpage);
            request.setAttribute("allpages", allpages);
            request.setAttribute("list", pagelist);
            request.getRequestDispatcher("getNote.jsp").forward(request, response);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void addNote(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        try {
            request.setCharacterEncoding("UTF-8");
            HttpSession session = request.getSession();
            User user = (User) session.getAttribute("user");
            if (user == null) {
                request.setAttribute("error", "对不起你还没有登录");
                request.getRequestDispatcher("error.jsp").forward(request, response);
            }
            Note note = new Note();
            note.setUserid(user.getId());
            note.setUsername(user.getName());
            note.setContent(request.getParameter("content"));
            NoteImpl ni = new NoteImpl(new JdbcCon().getCon());
            ni.addNote(note);
          /*  ArrayList list = ni.getNote();
            request.setAttribute("list", list);
            request.getRequestDispatcher("getNote.jsp").forward(request, response);*/
            response.sendRedirect("/eBook/NoteServlet?action=shownote");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}