Java获取对象占用内存大小

    public int getSize(Serializable ser) throws IOException {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ObjectOutputStream oos = new ObjectOutputStream(baos);
        oos.writeObject(ser);
        oos.close();
        return baos.size();
    }

或使用

ObjectSizeCalculator.getObjectSize(dto);

可能会报错：

Could not initialize class jdk.nashorn.internal.ir.debug.ObjectSizeCalculator$CurrentLayout