从JSONObject中解析数据，并赋给给定的对象

public static Object parseBean(JSONObject jsonObject, Object obj) {  if (jsonObject == null || obj == null) {   return null;  }  Class
      clazz = obj.getClass();  Iterator
      it = jsonObject.keys();  Field field = null;  String key = null;  try {   while (it.hasNext()) {    key = it.next().toString();    // 获得对应的属性    field = clazz.getDeclaredField(key);    // 获得属性对应的值    Object val = jsonObject.get(key); // 暂不考虑Date类型    if (field.getType() == Integer.TYPE) {     val = Integer.parseInt(val.toString());    } else if(field.getType() == Long.TYPE||field.getType() == Long.class) {     val = Long.parseLong(val.toString());    } else if (field.getType() == Date.class) {     if (field.isAnnotationPresent(DateTimeFormat.class)) {      String pattern = field.getAnnotation(DateTimeFormat.class).pattern();      val = DateUtil.parse(val.toString(), pattern);     } else {      val = DateUtil.parseDate(val.toString());     }    }else if(field.getType() == BigDecimal.class) {     if (StringUtils.hasText(val.toString())) {      val = new BigDecimal(val.toString());     }else{      val = null;     }          }     // 赋值    field.setAccessible(true);    field.set(obj, val);   }  } catch (Exception e) {   e.printStackTrace();   return null;  }  return obj; }