borrowbookbean.java

本系统完成简单的图书管理系统

/***********************************************************************
*                          湖南大学图书管理系统
* @author Administrator                                                         
* @since 2008.06                                                  
* @version 1.0                                                           															  
* @category 借书处理bean
*************************************************************************/

package library.control;

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Vector;
import java.io.IOException;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import library.DBaccess.BorrowDB;
import library.DBaccess.BorrowedBookDB;
import library.DBaccess.SearchBookDB;

public class BorrowBookBean extends HttpServlet {

	public BorrowBookBean() {
		// TODO Auto-generated constructor stub
		super();
	}

	String username = null;
	BorrowDB bd = new BorrowDB();
	SearchBookDB sdb = new SearchBookDB();

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		req.setCharacterEncoding("gb2312");
		if (req.getParameter("name").equals("borrow")) {

			BorrowedBookDB bbd = new BorrowedBookDB();
			String username = null;

			HttpSession session = req.getSession();
			username = ((ArrayList) session.getAttribute("userInfo")).get(0)
					.toString();

			Vector v = null;
			v = bbd.getBorrowedBook(username);

			System.out.println(v.size());
			req.setAttribute("borrowBook", v);

			System.out.println("借阅图书");
			req.setAttribute("title", "借阅图书");
			req.setAttribute("URL", "//manager/view/borrowBook.jsp");
			RequestDispatcher dis = this.getServletContext()
					.getRequestDispatcher("/manager/index.jsp");
			dis.forward(req, resp);
		}
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		Vector v = null;
		Hashtable hs = null;
		req.setCharacterEncoding("gb2312");
		String isbn;
		if (req.getParameter("name").equals("borrow")) {
			isbn = req.getParameter("isbn");
			v = sdb.getBookByName("ISBN", isbn);
			hs = (Hashtable) v.get(0);
			if (hs.get("COUNT").equals(0)) {
				req.setAttribute("title", "借阅图书");
				req.setAttribute("URL", "//manager/view/borrowerror.jsp");
				RequestDispatcher dis = this.getServletContext()
						.getRequestDispatcher("//manager/index.jsp");
				dis.forward(req, resp);
			} else {

				username = req.getParameter("username");
				System.out.println("借书同学为：" + username);
				bd.BorrowBook(isbn, username);
				req.setAttribute("title", "借阅图书");
				req.setAttribute("URL", "//manager/view/borrowsuc.jsp");

				RequestDispatcher dis = this.getServletContext()
						.getRequestDispatcher("//manager/index.jsp");
				dis.forward(req, resp);
			}
		}
		super.doPost(req, resp);
	}

	@Override
	public void destroy() {
		// TODO Auto-generated method stub
		super.destroy();
	}

	@Override
	public void init() throws ServletException {
		// TODO Auto-generated method stub
		super.init();
	}

}