题目： 简单做一个B/S结构的商业应用——购物车。JSP页面在附件中。
import javax.servlet.http.*; import javax.servlet.*; import java.util.*; public class DummyCart { Vector v = new Vector(); String submit = null; String item = null; private void addItem(String name) { v.addElement(name); } private void removeItem(String name) { v.removeElement(name); } public void setItem(String name) { item = name; } public void setSubmit(String s) { submit = s; } public String[] getItems() { String[] s = new String[v.size()]; v.copyInto(s); return s; } public void processRequest(HttpServletRequest request) { //判断submit的值 submit = (String)request.getParameter("submit"); // System.out.println(submit); item = (String)request.getParameter("item"); if(submit.equals("null")) addItem(item); if(submit.equals("add")) addItem(item); else if(submit.equals("remove")) removeItem(item); // 重置submit的值 reset(); } private void reset() { submit = null; item = null; } }
