content: package com.xxl.job.core.util;
  
  import com.google.gson.Gson;
  import com.google.gson.GsonBuilder;
  import com.google.gson.reflect.TypeToken;
  
  import java.lang.reflect.ParameterizedType;
  import java.lang.reflect.Type;
  import java.util.List;
  
  /**
   * @author xuxueli 2020-04-11 20:56:31
   */
  public class GsonTool {
  
      private static Gson gson = null;
      static {
              gson= new GsonBuilder().setDateFormat("yyyy-MM-dd HH:mm:ss").create();
      }
  
      /**
       * Object 转成 json
       *
       * @param src
       * @return String
       */
      public static String toJson(Object src) {
          return gson.toJson(src);
      }
  
      /**
       * json 转成 特定的cls的Object
       *
       * @param json
       * @param classOfT
       * @return
       */
      public static <T> T fromJson(String json, Class<T> classOfT) {
          return gson.fromJson(json, classOfT);
      }
  
      /**
       * json 转成 特定的 rawClass<classOfT> 的Object
       *
       * @param json
       * @param classOfT
       * @param argClassOfT
       * @return
       */
      public static <T> T fromJson(String json, Class<T> classOfT, Class argClassOfT) {
          Type type = new ParameterizedType4ReturnT(classOfT, new Class[]{argClassOfT});
          return gson.fromJson(json, type);
      }
      public static class ParameterizedType4ReturnT implements ParameterizedType {
          private final Class raw;
          private final Type[] args;
          public ParameterizedType4ReturnT(Class raw, Type[] args) {
              this.raw = raw;
              this.args = args != null ? args : new Type[0];
          }
          @Override
          public Type[] getActualTypeArguments() {
              return args;
          }
          @Override
          public Type getRawType() {
              return raw;
          }
          @Override
          public Type getOwnerType() {return null;}
      }
  
      /**
       * json 转成 特定的cls的list
       *
       * @param json
       * @param classOfT
       * @return
       */
      public static <T> List<T> fromJsonList(String json, Class<T> classOfT) {
          return gson.fromJson(
                  json,
                  new TypeToken<List<T>>() {
                  }.getType()
          );
      }
  
  }
  