📄 userservlet.java

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/*
 * UserServlet.java
 *
 * Created on 2008��1��12��, ����2:02
 */

package ArticleSharing;

import java.io.*;
import java.net.*;
import java.sql.ResultSet;

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

/**
 *
 * @author Snow
 * @version
 */
public class UserServlet 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)) {
            // �����µ��û���Ϣ
            String user_name = request.getParameter("name");
            String password = request.getParameter("password");
            String email = request.getParameter("email");
            String sql = "insert into users(user_name, password, email) values('" + user_name 
                       + "','" + password + "','" + email + "')";
            db.excuteUpdate(sql);
            
            // ���ø��û��ĻỰ����
            HttpSession session = request.getSession();
            session.setAttribute("user_name", user_name);
            session.setAttribute("role", "user");
            
            response.sendRedirect("articlelist.jsp"); // ҳ����ת
        }
        
        if ("login".equals(command)) {
            String user_name = request.getParameter("name");
            String password  = request.getParameter("password");
            String sql = "select user_id, role from users where user_name='" + user_name 
                       + "'and password='" + password + "'";
            ResultSet rs = db.excuteQuery(sql);
            try {
                if (rs.next()) {    // �ò�ѯ������Ϣ��д�Ự����
                    int user_id = rs.getInt(1);
                    String role = rs.getString(2);
                    HttpSession session = request.getSession();
                    session.setAttribute("user_id", String.valueOf(user_id));
                    session.setAttribute("user_name", user_name);
                    session.setAttribute("role", role);
                    
                    response.sendRedirect("articlelist.jsp"); // �ɹ���½
                }
                else {
                    response.sendRedirect("index.jsp"); //���������
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        
        if ("layout".equals(command)) { // ע���¼����ת����ҳ
            request.getSession().invalidate();
            response.sendRedirect("articlelist.jsp");
        }
        /* TODO output your page here
        out.println("<html>");
        out.println("<head>");
        out.println("<title>Servlet UserServlet</title>");
        out.println("</head>");
        out.println("<body>");
        out.println("<h1>Servlet UserServlet 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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