我刚刚开始学习JSP（并且一般来说，我对Java还是很陌生的），并且我想将JSON-lib与它一起使用。我要制作一个类似这样的页面：

<%@ page import="net.sf.json.JSONObject"%>
<%
String json = new JSONObject().put("hello", "world").toString();
out.println(json);
%>

我下载了json-lib-2.3-jdk15.jar并将其放在与.jsp页面相同的目录中。但是我得到这个错误

org.apache.jasper.JasperException: Unable to compile class for JSP:

An error occurred at line: 6 in the generated java file
Only a type can be imported. net.sf.json.JSONObject resolves to a package

An error occurred at line: 3 in the jsp file: /getCard.jsp
JSONObject cannot be resolved to a type
1: <%@ page import="net.sf.json.JSONObject" %>
2: <%
3: String json = new JSONObject().put("hello", "world").toString();
4: out.println(json);
5: %>
6:

如何使JSONObject类可用于我的.jsp页面？