package util;

 import java.lang.reflect.Field;

 import java.lang.reflect.Method;

 import java.util.List;

 import org.web3j.protocol.core.methods.response.Transaction;

 import com.alibaba.fastjson.JSONArray;

 import com.alibaba.fastjson.JSONObject;

 public class JSONUtil {

     /**

      * 获取Transaction相应的JSON对象

      * @param trans

      * @return

      */

     public static JSONObject getTransJSON(Transaction trans) {

         JSONObject data = getJSON(Transaction.class, trans);

         return data;

     }

     /**

      * 获取交易信息列表

      * @param transList

      * @return

      */

     public static JSONArray getTransListJSON(List<Transaction> transList) {

         JSONArray data = new JSONArray();

         for(Transaction trans : transList) {

             JSONObject transJson = getTransJSON(trans);

             data.add(transJson);

         }

         return data;

     }

     /**

      * 获取json对象

      * @param cls

      * @param obj

      * @return

      */

     public static JSONObject getJSON(Class<?> cls, Object obj) {

         JSONObject json = new JSONObject();

         Field[] fieldArray = cls.getDeclaredFields();

         for(Field field : fieldArray) {

             String fieldName = field.getName();

             String methodName = "get" + fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);

             try {

                 Method method = cls.getMethod(methodName);

                 Object fieldObject = method.invoke(obj, new Object[0]);

                 String fieldValue = null;

                 if(fieldObject != null) {

                     fieldValue = fieldObject.toString();

                 }

                 json.put(fieldName, fieldValue);

             } catch (Exception e) {

                 e.printStackTrace();

             }

         }

         return json;

     }

 }