📄 viewcart.java
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package v;
import java.io.IOException;
import java.io.PrintWriter;
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 entity.Book;
import entity.ShoppingCart;
public class ViewCart extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
HttpSession session = request.getSession(false);
String pageInfo ="../login.html";
if(null==session){
response.sendRedirect(pageInfo);
}else{
String str = (String) session.getAttribute("login");
if ("success".equals(str)) {
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.println("<a href=\"../servlet/BookList\">返回</a><br>");
this.displayShoppingCart(session, out);
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
// session.invalidate();
} else {
pageInfo = "../login.html";
response.sendRedirect(pageInfo);
}
}
}
private void displayShoppingCart( HttpSession session, PrintWriter out) {
ShoppingCart cart = (ShoppingCart)session.getAttribute("cart");
if(null==cart){
out.println("购物车中无内容");
}else {
Book[] books = cart.showAllBooks();
if(null!=books){
out.println("bookId bookName<br>");
for (Book book : books) {
out.println(book.getId()
+ " "
+ book.getName() + "<br>");
}
}
out.println("<a href=\"../servlet/InsertDB\">确认购买</a>");
}
}
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