The Mall shopping Cart module implemented by JSP

These two days, in learning JSP, just find a small module to practice practiced hand:

Here is how to implement the Shopping Cart module page effect:

Figure 1. Product Display page through this page for product selection, add to the shopping cart

Figure 2: Shopping Cart page

Figure 3. Item Quantity Setup

OK, not the map first, directly on the code; First look at the document structure of the project (perfectly formed):

The entire project consists of three classes and two JSP pages, each of which is labeled with the following code:

Cart.java

Package Shopping.cart;import Java.util.arraylist;import Java.util.iterator;import Java.util.list;public class Cart { list<cartitem> items = new arraylist<cartitem> ();p ublic list<cartitem> GetItems () {return items;} public void Setitems (list<cartitem> items) {this.items = items;} public void Add (Cartitem ci) {for (iterator<cartitem> iter = Items.iterator (); Iter.hasnext ();) {Cartitem item = Iter.next (); if (Item.getproduct (). GetId () = = Ci.getproduct (). GetId ()) {Item.setcount (Item.getcount () + 1); return;}} Items.Add (CI);} Public double Gettotalprice () {Double d = 0.0;for (iterator<cartitem> it = Items.iterator (); It.hasnext ();) {Cartitem current = It.next ();d + = Current.getproduct (). GetPrice () * Current.getcount (); return D;} public void Deleteitembyid (String productId) {for (iterator<cartitem> iter = Items.iterator (); Iter.hasnext ();) {Cartitem item = Iter.next (); if (Item.getproduct (). GetId (). Equals (ProductId)) {iter.remove (); return;}}}

Cartitem.java

Package Shopping.cart;import Shopping.cart.product;public class Cartitem {private Product product;private int count; public int GetCount () {return count;} public void SetCount (int count) {This.count = count;} Public product getproduct () {return product;} public void Setproduct (product product) {this.product = product;}}

Product.java

Package Shopping.cart;import Java.io.serializable;public class Product implements Serializable {private String id;// Product Identification private string name;//product name private string description;//Product description Private double price;//price public product () {}public P Roduct (string ID, string name, string description, double price) {this.id = Id;this.name = Name;this.description = Descrip Tion;this.price = Price;} public void SetId (String id) {this.id = ID;} public void SetName (String name) {this.name = name;} public void SetDescription (String description) {this.description = description;} public void Setprice (double price) {this.price = Price;} Public String GetId () {return ID;} Public String GetName () {return name;} Public String GetDescription () {return description;} Public double GetPrice () {return price;}}

Here are the two JSP page source code:

showproducts.jsp

<%@ page language= "java" import= "java.util.*" pageencoding= "GB18030"%><%@ page import= "shopping.cart.*"% ><%string path = Request.getcontextpath (); String basepath = request.getscheme () + "://" + request.getservername () + ":" + request.getserverport () + path + "/";%&GT;&L t;! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >

buy.jsp
<%@ page language= "java" import= "java.util.*" pageencoding= "GB18030"%><%@ page import= "shopping.cart.*"% ><%cart C = (cart) session.getattribute ("cart"), if (c = = null) {c = new cart (); Session.setattribute ("cart", c);} Double totalprice = C.gettotalprice (); Request.setcharacterencoding ("GBK"); String action = request.getparameter ("action"); MAP products = (HASHMAP) session.getattribute ("products"); if (action! = null && Action.trim (). Equals ("Add")) { String id = request.getparameter ("id"); Product P = (product) products.get (ID); Cartitem ci = new Cartitem (); ci.setproduct (P); Ci.setcount (1); C.add (CI);} if (action! = null && Action.trim (). Equals ("delete")) {String id = request.getparameter ("id"); C.deleteitembyid ( ID);} if (action! = null && Action.trim (). Equals ("Update")) {for (int i=0; I<c.getitems (). Size (); i++) {Cartitem CI = c . GetItems (). get (i), int count = Integer.parseint (Request.getparameter ("P" + ci.getproduct (). GetId ())); Ci.setcount ( count);}} %> <%strinG Path = Request.getcontextpath (); String basepath = request.getscheme () + "://" +request.getservername () + ":" +request.getserverport () +path+ "/";%> <%List<CartItem> items = C.getitems ();%><! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" "Http://www.w3.org/TR/html4/loose.dtd" >

Configure the relevant files, after the publication in Tomcat, enter http://localhost:8088/shopCart/ShowProducts.jsp in the browser can enter the product display page, other operations can be completed on the page!
Note: the Tomcatport (8088) I used was changed by myself, assuming that Tomcatport's children's shoes were not changed, and the default port was 8080.