Json工具类

package com.imagedt.banana.visiting.util;

import com.google.gson.*;
import com.google.gson.reflect.TypeToken;
import lombok.extern.slf4j.Slf4j;
import net.sf.json.JSON;
import org.apache.http.util.TextUtils;

import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

/**
 * User: cansheng
 * Date: 2018-09-03 15:41
 * Description: json工具类
 */
@Slf4j
public class JsonUtil {

	private static Gson gson =null;

	static{
		gson=new GsonBuilder()
				.registerTypeAdapter(Date.class, new JsonAdapter())
				.create();
	}

	/**
	 * 将对象转换成json字符串,支持: javabean,map,list,array
	 * @param obj 要转换的对象
	 * @return
	 */
	public static String toJson(Object obj){
		try {
			return gson.toJson(obj);
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException("JsonUtil将对象转换成json字符串出现异常",e);
		}
	}

	/**
	 * 将json字符串转换成对象
	 * @param clazz  要转换成的类型
	 * @param jsonString json字符串
	 * @return
	 */
	public static  T fromJson( Class clazz,String jsonString){
		try {
			return gson.fromJson(jsonString, clazz);
		} catch (Exception e) {
			e.printStackTrace();
			throw new RuntimeException("JsonUtil将json字符串转换成对象出现异常:"+jsonString,e);
		}
	}

	/**
	 * 将json字符串转换成对象
	 * @param clazz  要转换成的类型
	 * @param jsonString json字符串
	 * @return
	 */
	public static  List jsonToList( Class clazz,String jsonString){
		try {
			List lst = new ArrayList<>();
			JsonArray array = new JsonParser().parse(jsonString).getAsJsonArray();
			for (final JsonElement element : array) {
				lst.add(gson.fromJson(element, clazz));
			}
			return lst;
		} catch (Exception e) {
			throw new RuntimeException("JsonUtil将json字符串转换成对象出现异常:"+jsonString,e);
		}
	}

	static class JsonAdapter implements JsonSerializer, JsonDeserializer {

		@SuppressWarnings("unchecked")
		@Override
		public T deserialize(JsonElement json, Type type, JsonDeserializationContext context) throws JsonParseException {

			if (json != null) {
				try {
					if(type==Date.class){
						return (T) DateUtil.autoParse(json.getAsString());
					}
				} catch (JsonParseException e) {
					throw e;
				}
			}

			return null;
		}


		@Override
		public JsonElement serialize(T value, Type type,
									 JsonSerializationContext context) {

			if (value != null) {
				if(type==Date.class){
					return new JsonPrimitive(((Date)value).getTime());
				}
				return new JsonPrimitive(value.toString());
			}
			return null;
		}
	}


}