java对象和json数据转换实现方式2-使用gson实现

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测试代码：

package com.yanek.util.json;import java.util.ArrayList;import java.util.List;import com.google.gson.Gson;import com.google.gson.GsonBuilder;import com.google.gson.JsonElement;import com.google.gson.JsonParser;public class GsonUtil {/** * @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:::"+bean2Json(RoomTypeVOs));String s2=bean2Json(RoomTypeVOs);List<RoomTypeVO> RoomTypeVOs2=new ArrayList<RoomTypeVO>();RoomTypeVOs2=json2Bean(s2,List.class);System.out.println("json4:::"+bean2Json(RoomTypeVOs2));}    private static Gson gson = new GsonBuilder().create();        public static String bean2Json(Object obj){        return gson.toJson(obj);    }        public static <T> T json2Bean(String jsonStr,Class<T> objClass){        return gson.fromJson(jsonStr, objClass);    }        public static String jsonFormatter(String uglyJsonStr){        Gson gson = new GsonBuilder().setPrettyPrinting().create();        JsonParser jp = new JsonParser();        JsonElement je = jp.parse(uglyJsonStr);        String prettyJsonString = gson.toJson(je);        return prettyJsonString;    }}

输出如下：

json1:::{"RoomTypeVOs":[{"typeid":1,"typename":"nnn1","price":"20"},{"typeid":1,"typename":"nnn1","price":"20"}],"id":1,"name":"name1"}json2:::{"RoomTypeVOs":[{"typeid":1,"typename":"nnn1","price":"20"},{"typeid":1,"typename":"nnn1","price":"20"}],"id":1,"name":"name1"}json3:::[{"typeid":1,"typename":"nnn1","price":"20"},{"typeid":1,"typename":"nnn1","price":"20"}]json4:::[{"typeid":1.0,"typename":"nnn1","price":"20"},{"typeid":1.0,"typename":"nnn1","price":"20"}]

相关实体类：

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;}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;}

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