代码片段:反射获取Java对象中所有的属性名称和属性值

 

 

 

@Slf4j
public class Test3 {

    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException {

        Hello hello = new Hello();
        Map<String, Object> map = new HashMap<>();

        Class<? extends Hello> c = hello.getClass();
        Method[] methods = c.getMethods();
        for (Method method : methods) {
//            System.out.println(method);
            String name = method.getName();
            if (name.startsWith("get")) {
                map.put(name, method.invoke(hello));
            }
        }
        log.info(JSON.toJSONString(map.toString()));


        /*Map<String, Object> map = new HashMap<>();
        String[] fieldNames = getFiledName(hello);
        //获取属性的名字
        for (String name : fieldNames) { //遍历所有属性
            Object value = getFieldValueByName(name, hello);
            map.put(name, value);
        }*/
    }

    /* 根据属性名获取属性值
     * */
    private static Object getFieldValueByName(String fieldName, Object o) {
        try {
            String firstLetter = fieldName.substring(0, 1).toUpperCase();
            String getter = "get" + firstLetter + fieldName.substring(1);
            Method method = o.getClass().getMethod(getter);
            return method.invoke(o);
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 获取属性名数组
     */
    private static String[] getFiledName(Object o) {
        Field[] fields = o.getClass().getDeclaredFields();
        String[] fieldNames = new String[fields.length];
        for (int i = 0; i < fields.length; i++) {
            // System.out.println(fields[i].getType());
            fieldNames[i] = fields[i].getName();
        }
        return fieldNames;
    }

}