【Java】反射实现Json对象转化为指定类型对象

public class Main {
    public static void main(String[] args){
        JSONObject jo = new JSONObject();
        jo.put("a",1);
        //jo.put("b","hello");
        try {
            Ob ob = (Ob)JsonUtil.jsonToObject(new Ob(),jo);
            System.out.println(ob.getA());
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}
class JsonUtil{
    public static Object jsonToObject(Object object,JSONObject jsonObject) throws NoSuchFieldException, IllegalAccessException {
        Class ca = object.getClass();
        Iterator<String> iterator = jsonObject.keys();
        String key;
        while (iterator.hasNext()){
            key = iterator.next();
            Field field = ca.getDeclaredField(key);
            field.setAccessible(true);
            if(field.getName().equals(key)){
                field.set(object,jsonObject.get(key));
            }
        }
        return object;
    }
}

class Ob{
    private int a;
    private String b;

    public int getA() {
        return a;
    }

    public void setA(int a) {
        this.a = a;
    }

    public String getB() {
        return b;
    }

    public void setB(String b) {
        this.b = b;
    }

}