📄 shoppingcart.java
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//file: ShoppingCart.javaimport java.io.*;import javax.servlet.ServletException;import javax.servlet.http.*;import java.util.Enumeration;public class ShoppingCart extends HttpServlet { // from your database String [] items = new String [] { "Chocolate Covered Crickets", "Raspberry Roaches", "Buttery Butterflies", "Chicken Flavored Chicklets(tm)" }; public void doPost( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { doGet( request, response ); } public void doGet( HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter( ); // get or create the session information HttpSession session = request.getSession( ); int [] purchases = (int [])session.getValue("purchases"); if ( purchases == null ) { purchases = new int [ items.length ]; session.putValue( "purchases", purchases ); } out.println( "<html><head><title>Shopping Cart</title>" + "</title></head><body><p>" ); if ( request.getParameter("checkout") != null ) out.println("<h1>Thanks for ordering!</h1>"); else { if ( request.getParameter("add") != null ) { addPurchases( request, purchases ); out.println( "<h1>Purchase added. Please continue</h1>"); } else { if ( request.getParameter("clear") != null ) for (int i=0; i<purchases.length; i++) purchases[i] = 0; out.println("<h1>Please Select Your Items!</h1>"); } doForm( out, purchases, request.getRequestURI( ) ); } showPurchases( out, purchases ); out.close( ); } void addPurchases( HttpServletRequest request, int [] purchases ) { for (int i=0; i<items.length; i++) { String added = (String)request.getParameter( items[i] ); if ( !added.equals("") ) purchases[i] += Integer.parseInt( added ); } } void doForm( PrintWriter out, int [] purchases, String requestURI) { out.println( "<form method=POST action="+ requestURI +">" ); for(int i=0; i< items.length; i++) out.println( "Quantity <input name=\"" + items[i] + "\" value=0 size=3> of: " + items[i] + "<br>"); out.println( "<p><input type=submit name=add value=\"Add To Cart\">" + "<input type=submit name=checkout value=\"Check Out\">" + "<input type=submit name=clear value=\"Clear Cart\">" + "</form>" ); } void showPurchases( PrintWriter out, int [] purchases ) throws IOException { out.println("<hr><h2>Your Shopping Basket</h2>"); for (int i=0; i<items.length; i++) if ( purchases[i] != 0 ) out.println( purchases[i] +" "+ items[i] +"<br>" ); }}⌨️ 快捷键说明
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