checkuserservlet.java

实现了图书信息

/*
 * Created on 2007-4-5
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
package cn.edu.zucc;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import database.BookDB;

/**
 * @author wengwy
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class CheckUserServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        //TODO Method stub generated by Lomboz
        doPost(request,response);
    }

    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        //TODO Method stub generated by Lomboz
        String userid=request.getParameter("userid");
        String pwd=request.getParameter("pwd");
        try{
            String username=bookDB.checkuser(userid,pwd);
            request.setAttribute("userid",userid);
            request.setAttribute("username",username);
            response.sendRedirect("enter");
        }
        catch(Exception ex){
            request.getSession().setAttribute("errmsg",ex.getMessage());
            response.sendRedirect("index.jsp");
        }
    }
    /* (non-Javadoc)
     * @see javax.servlet.GenericServlet#init()
     */
    private BookDB bookDB;

    public void init() throws ServletException {
        bookDB = (BookDB) getServletContext().getAttribute("bookDB");
        if (bookDB == null)
            throw new UnavailableException("Couldn't get database.");
    }
}