📄 shoppingcar.java
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import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.lang.*;
public class ShoppingCar extends HttpServlet {
public void doPost(HttpServletRequest req,HttpServletResponse res) throws ServletException ,IOException{
HttpSession session =req.getSession(true);
Integer BookCount=(Integer)session.getValue("BookCount");
if(BookCount==null)
BookCount=new Integer(0);
PrintWriter out=res.getWriter();
res.setContentType("text/html");
String[] Selected;
Selected=req.getParameterValues("book");
if(Selected !=null){
for(int i=0;i<Selected.length;i++){
BookCount=new Integer(BookCount.intValue()+1);
//购买的条目
session.putValue("book"+(BookCount.intValue()-1),Selected[i]);
}
}
//总条目
session.putValue("BookCount",BookCount);
//String thisBook[]=new String();
out.println("<html><head><title>Book list</title></head>");
out.println("<body><h3>Book List:</h3><hr>");
for(int i=0;i<BookCount.intValue();i++){
out.println((String)session.getValue("book"+i));
out.println("<hr>");
}
out.println("<br>If You want to buy again,please click <a href=Shopping.html>here</a> again");
out.println("</body></html>");
}
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