Java中的List转换成JSON报错（二）

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at net.sf.json.AbstractJSON.<clinit>(AbstractJSON.java:53)
at com.you.model.ListToJSON.main(ListToJSON.java:29)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 2 more

/**
* 将List转换成JSON
*/
package com.you.model;

import java.util.ArrayList;
import java.util.List;

import net.sf.json.JSONArray;

/**
* @author YouHaiDong
*
*/
public class ListToJSON
{

/**
* @param args
*/
public static void main(String[] args)
{
List<String> list = new ArrayList<String>();
list.add("春天");
list.add("夏天");
list.add("秋天");
list.add("冬天");

JSONArray jsonArray = JSONArray.fromObject(list);

System.out.println("List转换成JSON：" + jsonArray.toString());
}

}