練習代碼如下：

import com.esotericsoftware.kryo.Kryo; import com.esotericsoftware.kryo.io.Input; import com.esotericsoftware.kryo.io.Output; import com.esotericsoftware.kryo.serializers.JavaSerializer;import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream;public class KryoDemo {public static void main(String[] args) {// 創建對象Person obj = new Person(123, "Sam");System.out.println(obj);// 序列化Kryo kryo = new Kryo();ByteArrayOutputStream os = new ByteArrayOutputStream();Output output = new Output(os);kryo.writeObject(output, obj);byte[] bytes = os.toByteArray();// 反序列化Input input = new Input(new ByteArrayInputStream(bytes));Person p = kryo.readObject(input, Person.class);System.out.println(p);}}

運行報錯：
Exception in thread “main” java.lang.IllegalArgumentException: Class is not registered: org.example.Person
Note: To register this class use: kryo.register(org.example.Person.class);
?at com.esotericsoftware.kryo.Kryo.getRegistration(Kryo.java:512)
?at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:560)
?at org.example.KryoDemo.main(KryoDemo.java:21)

其實是因為缺了下面的語句：

kryo.register(Person.class, new JavaSerializer());

完整代碼：

import com.esotericsoftware.kryo.Kryo; import com.esotericsoftware.kryo.io.Input; import com.esotericsoftware.kryo.io.Output; import com.esotericsoftware.kryo.serializers.JavaSerializer;import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream;public class KryoDemo {public static void main(String[] args) {// 創建對象Person obj = new Person(123, "Sam");System.out.println(obj);// 注冊實體類Kryo kryo = new Kryo();kryo.register(Person.class, new JavaSerializer());// 序列化ByteArrayOutputStream os = new ByteArrayOutputStream();Output output = new Output(os);kryo.writeObject(output, obj);byte[] bytes = os.toByteArray();// 反序列化Input input = new Input(new ByteArrayInputStream(bytes));Person p = kryo.readObject(input, Person.class);System.out.println(p);}}

同樣地，Spark用到Kryo的時候也要注冊！此處不加贅述！

總結

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