Java 如何使用 Kryo 序列化对象并再次反序列化？
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How can I use Kryo to serialize an object and deserialize it again?
提问by mcfly soft
How can I use Kryoto serialize an object and deserialize it again? I am working in Kryo 2.23.0
如何使用Kryo序列化对象并再次反序列化它？我在工作Kryo 2.23.0
采纳答案by Richard Tingle
Kryo's syntax is relatively similar to java serialisation. A kryo object is created as well as an output/input and one of kryos methods is used to perform the serialisation/deserialisation
Kryo 的语法与 java 序列化比较相似。创建 kryo 对象以及输出/输入，并且使用 kryos 方法之一来执行序列化/反序列化
kryo.writeClassAndObject(output, object); //for if the concrete class isn't known (can be null)kryo.writeObjectOrNull(output, someObject); //if the object could be nullkryo.writeObject(output, someObject); //can't be null and concrete class is known
kryo.writeClassAndObject(output, object); //for if the concrete class isn't known (can be null)kryo.writeObjectOrNull(output, someObject); //if the object could be nullkryo.writeObject(output, someObject); //can't be null and concrete class is known
Each of the writes is paired with a read
每个写入都与一个读取配对
SomeClass object = (SomeClass)kryo.readClassAndObject(input);SomeClass someObject = kryo.readObjectOrNull(input, SomeClass.class);SomeClass someObject = kryo.readObject(input, SomeClass.class);
SomeClass object = (SomeClass)kryo.readClassAndObject(input);SomeClass someObject = kryo.readObjectOrNull(input, SomeClass.class);SomeClass someObject = kryo.readObject(input, SomeClass.class);
The following is an example using writeClassAndObject that serialises a Vector3d to a file and back again.
以下是使用 writeClassAndObject 将 Vector3d 序列化到文件并再次返回的示例。
public class KryoTest {
public static void main(String[] args){
Vector3d someObject=new Vector3d(1,2,3);
//serialise object
//try-with-resources used to autoclose resources
try (Output output = new Output(new FileOutputStream("KryoTest.ser"))) {
Kryo kryo=new Kryo();
kryo.writeClassAndObject(output, someObject);
} catch (FileNotFoundException ex) {
Logger.getLogger(KryTest.class.getName()).log(Level.SEVERE, null, ex);
}
//deserialise object
Vector3d retrievedObject=null;
try (Input input = new Input( new FileInputStream("KryoTest.ser"))){
Kryo kryo=new Kryo();
retrievedObject=(Vector3d)kryo.readClassAndObject(input);
} catch (FileNotFoundException ex) {
Logger.getLogger(KryTest.class.getName()).log(Level.SEVERE, null, ex);
}
System.out.println("Retrieved from file: " + retrievedObject.toString());
}
}
All the up to date documentation has moved to github now; https://github.com/EsotericSoftware/kryo#quickstart
所有最新的文档现在都移到了 github；https://github.com/EsotericSoftware/kryo#quickstart
回答by Radim Burget
A simple version:
一个简单的版本：
Kryo kryo = new Kryo();
// #### Store to disk...
Output output = new Output(new FileOutputStream("file.bin"));
SomeClass someObject = ...
kryo.writeObject(output, someObject);
output.close();
// ### Restore from disk...
Input input = new Input(new FileInputStream("file.bin"));
SomeClass someObject = kryo.readObject(input, SomeClass.class);
input.close();
