Product class:
Package Com.lab;
public class Product {
private int id; Product number
private String name; Product Name
Private String description; Product Description
private float price; Commodity price
Construction method
public Product (int ID, string name, string description, float price) {
This.id = ID;
THIS.name = name;
this.description = description;
This.price = Price;
}
Setter methods and Getter methods for each attribute
public int getId () {
return ID;
}
public void setId (int id) {
This.id = ID;
}
Public String GetName () {
return name;
}
public void SetName (String name) {
THIS.name = name;
}
Public String getdescription () {
return description;
}
public void SetDescription (String description) {
this.description = description;
}
public float GetPrice () {
return price;
}
public void Setprice (float price) {
This.price = Price;
}
}
Showshoppingitem class:
Shoppingcartservlet
Package Com.lab;
Import com.lab.Product;
Import Com.lab.ShoppingItem;
Import java.io.*;
Import java.util.ArrayList;
Import java.awt.List;
Import java.util.List;
Import java.awt.Component;
Import javax.servlet.*;
Import javax.servlet.http.*;
Import java.io.Serializable;
Import Javax.servlet.annotation.WebServlet;
@WebServlet (name = "Shoppingcartservlet", Urlpatterns = {
"/products", "/viewproductdetails",
"/addtocart", "/viewcart", "/deleteitem"})
public class Shoppingcartservlet extends HttpServlet {
Products are list objects that store all items
Private List <Product> products = new ArrayList <Product> ();
@Override
public void Init () throws Servletexception {
Products.add (New Product (1, "SLR Camera",
"Nikon's most cost-effective SLR camera", 4159.95F));
Products.add (New Product (2, "Samsung Phone",
"Samsung's newest IPhone5 product", 1199.95F));
Products.add (New Product (3, "laptop",
"Lenovo's next-generation products", 5129.95F));
Products.add (New Product (4, "Tablet PC",
"Apple's new Product", 1239.95F));
}
@Override
public void doget (HttpServletRequest request,
HttpServletResponse response) throws Servletexception,
IOException {
String uri = Request.getrequesturi ();
Determines which method to invoke based on the request URI
if (Uri.endswith ("/products")) {
Showproductlist (response);
} else if (Uri.endswith ("/viewproductdetails")) {
Showproductdetails (request, response);
} else if (Uri.endswith ("Viewcart")) {
Showcart (request, response);
} else if (Uri.endswith ("DeleteItem")) {
DeleteItem (request, response);
}
}
This method is used to display all product information
private void Showproductlist (HttpServletResponse response)
Throws IOException {
Response.setcontenttype ("text/html;charset=gb2312");
PrintWriter out = Response.getwriter ();
Out.println (""Out.println ("<ul>");
for (Product product:products) {
Out.println ("<li>" + product.getname () + "("
+ Product.getprice ()
+ ") (" + "<a href= ' viewproductdetails?id="
+ Product.getid () + "' > Details </a>)");
}
Out.println ("</ul>");
Out.println ("<a href= ' Viewcart ' > View shopping cart </a>");
Out.println ("</body>}
private void Showproductdetails (HttpServletRequest request,
HttpServletResponse response) throws IOException {
Response.setcontenttype ("text/html;charset=gb2312");
PrintWriter out = Response.getwriter ();
int productId = 0;
try {
ProductId = Integer.parseint (
Request.getparameter ("id"));
} catch (NumberFormatException e) {
}
Return commodity objects by product number
Product Product = GetProduct (productId);
if (product! = NULL) {
Out.println ("+ "<title> Product Details </title>+ "<body><p> Product Details </p>"
+ "<form method= ' post ' action= ' AddToCart ' >");
Use hidden form fields to store product number information here
Out.println ("<input type= ' hidden ' name= ' id '"
+ "value=" + productId + "'/>");
Out.println ("<table>");
Out.println ("<tr><td> Product name:</td><td>"
+ product.getname () + "</td></tr>");
OUT.PRINTLN ("<tr><td> description:</td><td>"
+ product.getdescription () + "</td></tr>");
Out.println ("<tr><td> Price:</td><td>"
+ product.getprice () + "</td></tr>");
Out.println ("<tr>" + "<tr>"
+ "<td><input name= ' quantity '/></td>"
+ "<td><input type= ' submit ' value= ' buy '/> '
+ "</td>"
+ "</tr>");
Out.println ("<tr><td colspan= ' 2 ' >"
+ "<a href= ' products ' > product List </a>"
+ "</td></tr>");
Out.println ("</table>");
Out.println ("</form></body>");
} else {
Out.println ("No product found");
}
}
Return commodity object method according to product number
Private Product getproduct (int productId) {
for (Product product:products) {
if (product.getid () = = ProductId) {
return product;
}
}
return null;
}
public void DoPost (HttpServletRequest request,
httpservletresponse Response)
Throws Servletexception, IOException {
//Add purchased items to cart
int productId = 0;
int quantity = 0;
try {
productId = Integer.parseint (
request.getparameter ("id"));
quantity = integer.parseint (Request
. GetParameter ( "Quantity"));
} catch (NumberFormatException e) {}
Product Product = GetProduct (productId);
if (Product = null && quantity >= 0) {
Create a product entry
Shoppingitem Shoppingitem = new Shoppingitem (
product, quantity);
HttpSession session = Request.getsession ();
Find the shopping Cart object in the Session object
list<shoppingitem> cart = (list<shoppingitem>) session
. getattribute ("cart");
if (cart = = null) {
If the shopping cart object is not found on the session object, create a
Cart = new arraylist<shoppingitem> ();
Store the shopping Cart object on the Session object
Session.setattribute ("cart", cart);
}
Add a product to the shopping cart object
Cart.add (Shoppingitem);
}
Showproductlist (response);
}
private void Showcart (HttpServletRequest request,
HttpServletResponse response) throws IOException {
Response.setcontenttype ("text/html;charset=gb2312");
PrintWriter out = Response.getwriter ();
Out.println ("Out.println ("<body><a href= ' products ' >" +
"Product List </a>");
HttpSession session = Request.getsession ();
list<shoppingitem> cart = (list<shoppingitem>) session
. getattribute ("cart");
if (cart! = null) {
Out.println ("<table>");
Out.println ("<tr><td style= ' width:50px ' > Quantity"
+ "</td>"
+ "<td style= ' width:80px ' > Products </td>"
+ "<td style= ' width:80px ' > Price </td>"
+ "<td style= ' width:80px ' > Subtotal </td>"
+ "<td style= ' width:80px ' > Delete </td></tr>");
Double total = 0.0;
for (Shoppingitem Shoppingitem:cart) {
Product Product = Shoppingitem.getproduct ();
int quantity = Shoppingitem.getquantity ();
if (Quantity! = 0) {
float price = Product.getprice ();
Out.println ("<tr>");
Out.println ("<td>" + quantity + "</td>");
Out.println ("<td>" + product.getname ()
+ "</td>");
Out.println ("<td>" + price + "</td>");
Calculate subtotals and implement rounding
Double subtotal = ((int) (price * quantity*100+0.5))/100.00;
Out.println ("<td>" + Subtotal + "</td>");
Out.println ("<td><a href=deleteitem?id=" +
Product.getid () + ">" + "delete </a>" + "</td>");
Total + = subtotal;
Out.println ("</tr>");
}
}
Out.println ("<tr><td colspan= ' 4 '"
+ "style= ' text-align:right ' >"
+ "Total:" + totals + "</td></tr>");
Out.println ("</table>");
}
Out.println ("</table></body>}
}
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