Java获取泛型对象属性/私有对象属性

1.泛型对象,非私有属性,有ReadMethod

实现思路反射,获取Object实际class与bean属性,调用readMethod读取属性

public Map<String, Object> transBean2Map(Object obj) {
        if (obj == null) {
            return Collections.emptyMap();
        }
        Map<String, Object> map = new HashMap<>(10);
        try {
            java.beans.BeanInfo beanInfo = java.beans.Introspector.getBeanInfo(obj.getClass());
            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();

            for (java.beans.PropertyDescriptor property : propertyDescriptors) {
                String key = property.getName();
                // 过滤class属性
                if ("allFields".equals(key)) {
                    // 得到property对应的getter方法
                    Method getter = property.getReadMethod();

                    LOG.debug("getter {}", getter);
                    Object value = getter.invoke(obj);
                    LOG.debug("key: {},value: {}", key, value);
                    map.put(key, value);

                    Map<Object, Object> allValues = (Map<Object, Object>) value;
                    allValues.forEach((key1, value1) -> {
                        String fieldKey = ((com.google.protobuf.Descriptors.FieldDescriptor) key1).getName();
                        map.put(fieldKey, value1);
                    });
                }
            }
        } catch (Exception e) {
            LOG.error("transBean2Map Error ", e);
        }

        return map;
    }

2. 私有属性

            Class<?> clusterType = clusterDescriptor.getClass();
            Field clusterField = clusterType.getDeclaredField("yarnPb");
            clusterField.setAccessible(true);
            ApplicationReportPBImpl yarnPb = (ApplicationReportPBImpl) clusterField.get(clusterDescriptor);