typeandconcemservlet.java

一套网上书店系统采用JAVABEAN+SERVLET+JSP

package cn.dang.servlet;

import ghy_db.Conn_Manager;

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

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

import cn.dang.entity.Book;
import cn.dang.entity.Concem;
import cn.dang.entity.Type;
import cn.dang.service.AllService;

public class TypeAndConcemServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public TypeAndConcemServlet() {
		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>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @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 {
		//创建服务层对象
		AllService allService=new AllService();
		try {
			//获得书籍类型的所有信息
			//调用服务层方法获得数据保存中Type类型的容器中
			List<Type> types=allService.getTypeService().getTypeInfo();
			//将数据保存到reuqest中
			request.setAttribute("types", types);
			//获得出版社所有信息
			//调用服务层方法获得数据保存中Concem类型的容器中
			List<Concem> concems=allService.getConcemService().getConcemInfoAll();
			//将数据保存到reuqest中
			request.setAttribute("concems", concems);
			//成功进行事务提交
			Conn_Manager.transaction_commit();
			//跳转到页面进行数据显示
			request.getRequestDispatcher("../manager/rightBook.jsp").forward(request, response);
		} catch (Throwable e) {
			// TODO Auto-generated catch block
			//出现异常则回滚数据
			Conn_Manager.transaction_rollback();
			e.printStackTrace();
		}
	}

	/**
	 * 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 {
		this.doGet(request, response);
	}

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

}