java對象和json資料轉換實現方式1-使用json-lib實現

標籤：java對象轉換json   json轉換對象   

測試代碼：

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);    }    /**      * 從一個JSON數組得到一個java對象數組，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;      }}

輸出如下：

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-nnn1-201-nnn1-20

相關java實體類：

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;}