addword.java

使用OSGi框架开发的分布式电子辞典

/*
 * @(#)AddWord.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.DuplicateWordException;
import cn.edu.ynu.sei.dict.core.exception.NotFoundWordException;
import cn.edu.ynu.sei.dict.core.service.IDictEditService;
import cn.edu.ynu.sei.dict.core.service.IDictQueryService;
import cn.edu.ynu.sei.dict.core.service.User;
import cn.edu.ynu.sei.dict.core.service.Word;
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 add new word.
 * @author zy
 * @version 1.0.0.0, Mar 13, 2008
 */
public class AddWord extends HttpServlet {

    private IDictQueryService wordReader;
    private IDictEditService wordWriter;
    private IUserManager userManager;

    /**
     * default constructor.
     */
    public AddWord() {
    }

    /**
     * constructor with argument.
     * @param qs
     *         the interface for reading word.
     * @param ds
     *         the interface for writering word.
     * @param um
     *         the interface for user management.
     */
    public AddWord(IDictQueryService qs, IDictEditService ds, IUserManager um) {
        this.wordReader = qs;
        this.wordWriter = ds;
        this.userManager = um;
    }

    /** 
     * 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();
        if (session.getAttribute("user") == null) {
            out.write("您还没有登录，请先登录!");
        } else {
            User user = (User)session.getAttribute("user");
            String self = request.getParameter("word");
            String def = request.getParameter("def");
            def = new String(def.getBytes("iso-8859-1"),"utf-8");
            Word vocabulary = new Word();
            vocabulary.defComeFrom = user.name;
            vocabulary.self = self;
            vocabulary.definition = def;
            try {
                wordWriter.addVocabulary(vocabulary);
                out.write("添加成功!");
            } catch (DuplicateWordException ex) {
                out.write(ex.getMessage());
            }
        }
    }

    // <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>
}