如何提高存储和加载文件的性能

Question

我用这个来存储

FileOutputStream savedList = new FileOutputStream(....);
                GZIPOutputStream gz = new GZIPOutputStream(savedList);
                ObjectOutputStream oosList = new ObjectOutputStream(
                        gz);
                oosList.writeObject(input);

                oosList.close();

这个要加载

 FileInputStream savedSerializable = new FileInputStream(....);

            GZIPInputStream gz = new GZIPInputStream(savedSerializable);
            ObjectInputStream oisList = new ObjectInputStream(
                    gz);
            savedList = (Serializable) oisList.readObject();

如何提高存储和加载速度？ BufferedInputStream 和 BufferedOutputStream 可以提高性能吗？如果是，我应该如何正确使用和配置这些（平均文件大小为 6 到 50mb）？

Answer 1

您可以使用 Kryo (https://github.com/EsotericSoftware/kryo)，它可以更快地执行序列化并减少文件大小，从而提高总加载/保存的速度。

编辑

以下代码将为您提供有关如何使用它的提示

    Kryo k = new Kryo();
    Object[] input = new Object[]{/*...*/};

    //make serialization faster using code generation
    k.setAsmEnabled(true);
    //allow you to serializae objects of classes that does not have a default constructor
    k.setInstantiatorStrategy(new StdInstantiatorStrategy());

    //you should now register all the clsses types that you intend to use with kryo
    k.register(A.class);
    k.register(B.class);
    //...
    //now you can write your objects this way:
    try (ZipOutputStream zip = new ZipOutputStream(new FileOutputStream(DATA_STORE_LOCATION));
         Output out = new UnsafeOutput(zip)) {
        k.writeObject(out, input);
    }

    //and read it this way
    try (ZipInputStream zip = new ZipInputStream(new FileInputStream(DATA_STORE_LOCATION));
            Input in = new UnsafeInput(zip)){
        Object[] store = k.readObject(in, Object[].class);
    }