cart.java

此为一个网上购书系统的JSP代码,包括填加图书,定单等功能.

package cart;
import java.util.Vector;
public class Cart {
    Vector v = new Vector();
    String act = null;
    String item = null;
    private void addItem(String id) {
		v.addElement(id);
    }
    private void removeItem(String id) {
		v.removeElement(id);
    }
    public void setItem(String id) {
		item = id;
    }
    public void setAct(String s) {
		act = s;
    }
    public String[] getItems() {
		String[] s = new String[v.size()];
		v.copyInto(s);
		return s;
    }
    public void processRequest() {
		if (act.equals("add"))
		    addItem(item);
		else if (act.equals("remove")) 
		    removeItem(item);	
		// reset at the end of the request
		reset();
    }
    // reset
    private void reset() {
		act = null;
		item = null;
    }
    public void clearAll(){
    	v.removeAllElements();
    }
}