addfriend.java

使用OSGi框架开发的分布式电子辞典

/*
 * @(#)AddFriend.java.
 * 
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Library General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

package cn.edu.ynu.sei.dict.web.data;

import cn.edu.ynu.sei.dict.core.exception.AlreadyExsistException;
import cn.edu.ynu.sei.dict.core.exception.NotFoundUserException;
import cn.edu.ynu.sei.dict.core.service.User;
import cn.edu.ynu.sei.dict.plugin.user.service.IUserManager;
import java.io.*;

import java.util.logging.Level;
import java.util.logging.Logger;
import javax.servlet.*;
import javax.servlet.http.*;

/**
 * Handle adding friend.
 * @author zy
 * @version 1.0.0.0, Mar 14, 2008
 */
public class AddFriend extends HttpServlet {
    
    private IUserManager userManager;
    
    /**
     * default constructor.
     */
    public AddFriend(){
        
    }
    
    /**
     * constructor with argument.
     * @param userNanager
     *         the interface of user management.
     */
    public AddFriend(IUserManager userManager){
        this.userManager = userManager;
    }
   
    /** 
    * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
    * @param request servlet request
    * @param response servlet response
    */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        HttpSession session = request.getSession();
        User user = (User)session.getAttribute("user");
        String fname = request.getParameter("name");
        if(user.name.equals(fname)){
            out.write("2");
            return;
        }
        try {
            System.out.println(user.name);
            System.out.println(fname);
            userManager.addSubscriptions(user.name, fname);
        } catch (AlreadyExsistException ex) {
            System.out.println("0e");
            out.write("0");
            return;
        } catch (NotFoundUserException ex) {
            System.out.println("1e");
            out.write("1");
            return;
        }
        String output = "<div id='" + fname +"'>" + fname
                    + "<input type='radio' name='rlist' value='" 
                    + fname + "'/>"
                    + "<a href='#' onclick=\"deleteItem('" + fname + "')\" title='Delete Friend' style='text-decoration:none; padding-left:80px'>" +
                    "<img src='DelFriend.gif' alt='Delete Friend' width='12' height='5' border='0' /></a></div>";
        out.write(output);
    } 

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** 
    * Handles the HTTP <code>GET</code> method.
    * @param request servlet request
    * @param response servlet response
    */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    } 

    /** 
    * Handles the HTTP <code>POST</code> method.
    * @param request servlet request
    * @param response servlet response
    */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }

    /** 
    * Returns a short description of the servlet.
    */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
}