📄 commentservlet.java

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/*
 * CommentServlet.java
 *
 * Created on 2008��1��10��, ����9:28
 */

package ArticleSharing;

import java.io.*;
import java.sql.ResultSet;
import java.text.SimpleDateFormat;
import java.util.*;

import javax.servlet.*;
import javax.servlet.http.*;

/**
 *
 * @author Snow
 * @version
 */
public class CommentServlet extends HttpServlet {
    
    /** 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();
        DBTools db = new DBTools();
        String command = request.getParameter("command");
        
        if ("insert".equals(command)) {
            String article_id = request.getParameter("article_id");
            System.out.println(article_id);
            String date = new SimpleDateFormat("yyyy-MM-dd",Locale.SIMPLIFIED_CHINESE).format(new java.util.Date());
            String comment = request.getParameter("comment");
            String author = request.getParameter("comment_author");
            comment = DBTools.changeCharset(comment, "ISO-8859-1", "utf-8");
            author = DBTools.changeCharset(author, "ISO-8859-1", "utf-8");
            
            // �����۵Ĳ���
            String sql = "insert into responses(response_content, responser_name, response_date, post_id) values('"
                       + comment + "','" + author + "','" + date + "','" + article_id + "')";
            db.excuteUpdate(sql);
            
            // �����µ��������+1
            sql = "select response_quantity from posts where post_id='" + article_id + "'";
            ResultSet rs = db.excuteQuery(sql);
            int response_quantity = 0;
            try {
                if (rs.next()) {    // ȡ��ԭ4�����۴���
                    response_quantity = rs.getInt(1) + 1;
                
                    // �����º��comment_time��ݴ�����ݿ�
                    sql = "update posts set response_quantity='" + response_quantity + "' where post_id='" + article_id + "'";
                    db.excuteUpdate(sql);
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
            
            response.sendRedirect("comments.jsp?id=" + article_id);
        }
        
        if ("delete".equals(command)) {
            String id = request.getParameter("id");
            
            // �������±��
            String article_id = null;
            String sql = "select post_id from responses where response_id='" + id + "'";
            ResultSet rs = db.excuteQuery(sql);
            try {
                if (rs.next()) {
                    article_id = rs.getString(1);
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
            
            // ɾ�������
            sql = "delete from responses where response_id='" + id + "'";
            db.excuteUpdate(sql);
            
            // �����µ��������-1
            sql = "select response_quantity from posts where post_id='" + article_id + "'";
            rs = db.excuteQuery(sql);
            int comment_time = 0;
            try {
                if (rs.next()) {    // ȡ��ԭ4�����۴���
                    comment_time = rs.getInt(1) - 1;
                
                    // �����º��comment_time��ݴ�����ݿ�
                    sql = "update posts set response_quantity='" + comment_time + "' where post_id='" + article_id + "'";
                    db.excuteUpdate(sql);
                }
            } catch(Exception e) {
                e.printStackTrace();
            }
            response.sendRedirect("managerComments.jsp");
        }
        
        /* TODO output your page here
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet CommentServlet</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Servlet CommentServlet at " + request.getContextPath () + "</h1>");
        out.println("</body>");
        out.println("</html>");
         */
        out.close();
    }
    
    // <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>
}
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