Java 产生不重复的随机数

	  int numberCount = 6;
		  Set set = new TreeSet();
		  while (set.size() < numberCount) {
		   int number = (int) (Math.random() * 33)+1;
		   if (!set.contains(number)) {
		    set.add(number);
		   }
		  }
	//	 out.println(set);
		 String result=set.toString().substring(1,set.toString().length()-1);
		// result=result.lastIndexOf(",");
		// out.println(result);
		for(int i=0;i<set.size();i++){
		//	Iterator ite=ts.iterator();
		}
		
		
		int team=Integer.parseInt(request.getParameter("team"));
	   	String[] str=(String[])request.getSession().getAttribute("fnstr");
	   	for(int i=0;i<str.length;i++){
	   		out.println(str[i]);
	   	}