function checkoutUserlist(){ // js 解析json陣列
			var statuslist = [{"isAvailabe":"1","name":"pacoson"},{"isAvailabe":"0","name":"tangtang"},{"isAvailabe":"0","name":"zhangsan"},{"isAvailabe":"0","name":"lisi"},{"isAvailabe":"0","name":"wangwu"}];						
			for(var i=0; i<statuslist.length; i++) {
				alert(statuslist[i].name);
			}
			
			/* for(var i=0; i<data[0].length; i++) {						
				appendAIntoDiv("second_userlist", data[0][i], data[1][i]);
			} */
		} 
 

// java ArrayList 轉 json 陣列
	public void checkoutUserlist(HttpSession session) {
		List<String> namelist = repository.checkoutUserlist();
		statuslist = new ArrayList<>(namelist.size());
		String from = (String) session.getAttribute("curuser");
		
		for (String to : namelist) {
			String isAvailabe = String.valueOf(isUserAvaible(from,to));
			UserStatus status = new UserStatus(isAvailabe, to);
			statuslist.add(status);
		}
		
		ObjectMapper mapper = new ObjectMapper();
		try {
			String json_result = mapper.writeValueAsString(statuslist);
			session.setAttribute("statuslist", json_result);		
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		}
		System.out.println("statuslist.size = " + statuslist.size());
	}