測试代码：

package com.yanek.util.json;

import java.util.ArrayList;

import java.util.List;

import net.sf.json.JSONArray;

import net.sf.json.JSONObject;

public class JSONLibUtil {

	/**

	 * @param args

	 */

	public static void main(String[] args) {

		Hotel h1=new Hotel();

		h1.setId(1);

		h1.setName("name1");

		Hotel h2=new Hotel();

		h2.setId(2);

		h2.setName("name2");

		RoomTypeVO t1=new RoomTypeVO();

		t1.setPrice("20");

		t1.setTypeid(1);

		t1.setTypename("nnn1");

		List<RoomTypeVO> RoomTypeVOs=new ArrayList<RoomTypeVO>();

		RoomTypeVOs.add(t1);

		RoomTypeVOs.add(t1);

		h1.setRoomTypeVOs(RoomTypeVOs);

		Hotel hotel=new Hotel();

		System.out.println("json1:::"+bean2Json(h1));

		String s=bean2Json(h1);

		hotel=json2Bean(s,Hotel.class);

		System.out.println("json2:::"+bean2Json(hotel));

		System.out.println("json3:::"+beanlist2Json(RoomTypeVOs));

		String s2=beanlist2Json(RoomTypeVOs);

		Object[] list=getDTOArray(s2,RoomTypeVO.class);

		for(Object v:list)

		{

			RoomTypeVO rt=(RoomTypeVO)v;

			System.out.println(rt.getTypeid()+"-"+rt.getTypename()+"-"+rt.getPrice());

		}

	}

	public static String bean2Json(Object obj){

        JSONObject jsonObject=JSONObject.fromObject(obj);

        return jsonObject.toString();

    }

	public static String beanlist2Json(Object obj){

		JSONArray jsonObject=JSONArray.fromObject(obj);

        return jsonObject.toString();

    }

    @SuppressWarnings("unchecked")

    public static <T> T json2Bean(String jsonStr,Class<T> objClass){

        return (T)JSONObject.toBean(JSONObject.fromObject(jsonStr), objClass);

    }

    @SuppressWarnings("unchecked")

    public static <T> T jsonarray2Bean(String jsonStr,Class<T> objClass){

        return (T)JSONObject.toBean(JSONObject.fromObject(jsonStr), objClass);

    }

    /**

     * 从一个JSON数组得到一个java对象数组，形如：

     * [{"id" : idValue, "name" : nameValue}, {"id" : idValue, "name" : nameValue}, ...]

     * @param object

     * @param clazz

     * @return

     */

     public static Object[] getDTOArray(String jsonString, Class clazz){  

          JSONArray array = JSONArray.fromObject(jsonString);

         Object[] obj = new Object[array.size()];

              for(int i = 0; i < array.size(); i++){

                   JSONObject jsonObject = array.getJSONObject(i);

                  obj[i] = JSONObject.toBean(jsonObject, clazz);

              }

              return obj;

    }

}

输出例如以下：

json1:::{"id":1,"name":"name1","roomTypeVOs":[{"price":"20","typeid":1,"typename":"nnn1"},{"price":"20","typeid":1,"typename":"nnn1"}]}

json2:::{"id":1,"name":"name1","roomTypeVOs":[{"price":"20","typeid":1,"typename":"nnn1"},{"price":"20","typeid":1,"typename":"nnn1"}]}

json3:::[{"price":"20","typeid":1,"typename":"nnn1"},{"price":"20","typeid":1,"typename":"nnn1"}]

1-nnn1-20

1-nnn1-20

相关java实体类：

package com.yanek.util.json;

public class RoomTypeVO {

	public int getTypeid() {

		return typeid;

	}

	public void setTypeid(int typeid) {

		this.typeid = typeid;

	}

	public String getTypename() {

		return typename;

	}

	public void setTypename(String typename) {

		this.typename = typename;

	}

	public String getPrice() {

		return price;

	}

	public void setPrice(String price) {

		this.price = price;

	}

	private int typeid;

	private String typename;

	private String price;

}

package com.yanek.util.json;

import java.util.List;

public class Hotel {

	public List<RoomTypeVO> getRoomTypeVOs() {

		return RoomTypeVOs;

	}

	public void setRoomTypeVOs(List<RoomTypeVO> roomTypeVOs) {

		RoomTypeVOs = roomTypeVOs;

	}

	private List<RoomTypeVO> RoomTypeVOs;

	public int getId() {

		return id;

	}

	public void setId(int id) {

		this.id = id;

	}

	public String getName() {

		return name;

	}

	public void setName(String name) {

		this.name = name;

	}

	private int id;

	private String name;

}