java利用反射将pojo转为json对象

最近做以太坊钱包项目需要与前台进行json交互，写一个工具类，经普通javaBean转为json对象

 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;
     }

 }