该源码为JSP的开发案例集锦

				package ch4;
				import java.util.Vector;
				import java.util.Enumeration;
				public class Buy {
				    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() {
						if (submit.equals("add"))
						    addItem(item);
						else if (submit.equals("remove")) 
						    removeItem(item);	
						// reset at the end of the request
						reset();
				    }
				    private void reset() {
						submit = null;
						item = null;
				    }
				}