📄 addcart.java

📁 实现在线的增删改查和一些基本的功能！这是一个简单的网页！

💻 JAVA

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package action;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.Map;

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 model.BookInformation;
import model.MycartBean;
import Dao.BookInformationD;

public class AddCart extends HttpServlet {

	
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=gbk");
		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>");
		String Bookid=request.getParameter("bookid");
		BookInformationD bookdao=new BookInformationD();
		int nbookid=Integer.parseInt(Bookid);
		BookInformation bookmation=bookdao.getBookId(Integer.parseInt(Bookid));
		HttpSession session = request.getSession();
		Map cart = (Map)session.getAttribute("cart");
		if(cart == null){
			cart = new HashMap();
			session.setAttribute("cart", cart);
		}
		
		MycartBean item = (MycartBean)cart.get(new Integer(nbookid));
		if(!cart.containsKey(new Integer(nbookid))){
			cart.put(new Integer(nbookid), new MycartBean(bookmation,1));
		}else{
			item.setQuantity(item.getQuantity() + 1);
		}
		
		out.print("    This is ");
		out.print(this.getClass());
		out.println("添加成功<br>");
		out.println("<a href='welcome.jsp'>继续添加</a><br>");
		out.println("<a href='ShowMyCart.jsp'>查看购物车</a>");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	
	public void doPost(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 POST method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
	}

	

}

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