sortbookservlet.java

该项目为网上书店

package org.myrose.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

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

import org.myrose.beans.BookInfo;
import org.myrose.dao.BookInfoDAO;

public class SortBookServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public SortBookServlet() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 * 
	 * 此方法对书进行排序操作
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=GBK");
		request.setCharacterEncoding("GBK");
		String type = request.getParameter("type");

		BookInfoDAO bookDAO = new BookInfoDAO();
		BookInfo book = new BookInfo();
		List listtype = null;
		List listbook = null;
		try {
			listtype = bookDAO.getBookTypes();
			if (type == null || type.equals("")) {
				Iterator i = listtype.iterator();
				if (i.hasNext()) {
					book = (BookInfo) i.next();
				}
			} else {
				type = new String(type.getBytes("ISO-8859-1"));
				book.setType(type);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}

		try {
			if (book != null) {
				listbook = bookDAO.getBookByType(book);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		request.setAttribute("type", type);
		request.setAttribute("listtype", listtype);
		request.setAttribute("listbook", listbook);
		request.getRequestDispatcher("booksort.jsp").forward(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 * 
	 * This method is called when a form has its tag value method equals to
	 * post.
	 * 
	 * @param request
	 *            the request send by the client to the server
	 * @param response
	 *            the response send by the server to the client
	 * @throws ServletException
	 *             if an error occurred
	 * @throws IOException
	 *             if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=GBK");
		request.setCharacterEncoding("GBK");
	}

	/**
	 * Initialization of the servlet. <br>
	 * 
	 * @throws ServletException
	 *             if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}