📄 delorentershopcarservlet.java

📁 手工完成
💻 JAVA
字号:
package Servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.HashMap;

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 Bean.DBConn;

public class DelOrEnterShopCarServlet extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public DelOrEnterShopCarServlet() {
		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 {

		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	/**
	 * 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 {

		//---------------------Start MyCode-----------------------------------------------
		HttpSession session = request.getSession();
		
		String strDelete = request.getParameter("SubmitDelete");
		String strShopCar = request.getParameter("SubmitShopCar");
		
		String strbookID = request.getParameter("bookID");
		String strusername = request.getParameter("");
			strusername = (String)request.getParameter("username");System.out.println("------------------------");
			System.out.println(strusername);
			
		String count = request.getParameter("count");System.out.println("count is " + count);
		if(strDelete != null)
		{	
			Connection conn=new DBConn().getConn();
			String SQLString = "delete from savebook where bookID = '" + strbookID + "'and username = '" + strusername + "'";
			
				try {
					java.sql.Statement Stmt = conn.createStatement(); //语句对象 

					Stmt.executeUpdate(SQLString);
					
					Stmt.close (); 
					conn.close();
					conn.close();
				} catch (SQLException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				
				request.getRequestDispatcher("/ShowSaveBook.jsp").forward(request, response);
			
		}
		if(strShopCar != null)
		{
			//---------------这是有添加到购物车中-----------------

			HashMap ShopCar = (HashMap)session.getAttribute("ShopCar");
			
			if(ShopCar == null)
			{	
				ShopCar = new HashMap();
			}
			String testCount = (String)ShopCar.get(strbookID);
			if(testCount == null)  //购物车中没有这种货物时
			{
				ShopCar.put(strbookID,count);//将购买的货物放入购物车
			}
			else   //购物车中有这种货物时，只需向testCount上加上Count即可
			{
				int newCount = Integer.parseInt(count) + Integer.parseInt(testCount);
				count = String.valueOf(newCount);
				ShopCar.put(strbookID,count);   //将改后的Count存入ShopCar中
			}System.out.println("count shi " + count);
			session.setAttribute("ShopCar",ShopCar);//将ShopCar存放如session中
			request.getRequestDispatcher("/BookShopCar.jsp").forward(request,response);
//			response.sendRedirect("/BookShopCar.jsp");
		}
		
//-----------------------------End MyCode-------------------------------------------------------------

	}

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

}
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -