【java】java原生序列化和Kryo序列化性能实例对比分析

1.美图

2.概述

最近几年，各种新的高效序列化方式层出不穷，不断刷新序列化性能的上限，最典型的包括：
专门针对Java语言的：Kryo，FST等等
跨语言的：Protostuff，ProtoBuf，Thrift，Avro，MsgPack等等
这些序列化方式的性能多数都显著优于hessian2（甚至包括尚未成熟的dubbo序列化）。有鉴于此，我们为dubbo引入Kryo和FST这 两种高效Java序列化实现，来逐步取代hessian2。其中，Kryo是一种非常成熟的序列化实现，已经在Twitter、Groupon、 Yahoo以及多个著名开源项目（如Hive、Storm）中广泛的使用。而FST是一种较新的序列化实现，目前还缺乏足够多的成熟使用案例，但它还是非 常有前途的，下面我们比较下，java原生序列化Kryo序列化性能比较
1、实体类 Simple.java

package bhz.entity;
import java.io.Serializable;
import java.util.Map;
public class Simple implements Serializable
{ 
   private static final long serialVersionUID = -4914434736682797743L; 
   private String name; 
   private int age; 
   private Map<String,Integer> map; 
   public Simple(){ 
   } 
   public Simple(String name,int age,Map<String,Integer> map){ 
     this.name = name; 
     this.age = age; 
     this.map = map; 
   } 
   public String getName() { 
    return name; 
   } 
   public void setName(String name) { 
    this.name = name; 
   } 
   public int getAge() { 
    return age; 
   } 
   public void setAge(int age) { 
    this.age = age; 
   } 
   public Map<String, Integer> getMap() { 
    return map; 
   } 
   public void setMap(Map<String, Integer> map) { 
    this.map = map; 
   } 
} 

2、java原生序列化 OriginalSerializable.java

package bhz.test;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.HashMap;
import java.util.Map;
import bhz.entity.Simple;
public class OriginalSerializable { 
  public static void main(String[] args) throws IOException, ClassNotFoundException { 
    long start = System.currentTimeMillis(); 
    setSerializableObject(); 
    System.out.println("java原生序列化时间:" + (System.currentTimeMillis() - start) + " ms" );  
    start = System.currentTimeMillis(); 
    getSerializableObject(); 
    System.out.println("java原生反序列化时间:" + (System.currentTimeMillis() - start) + " ms"); 
  } 
  public static void setSerializableObject() throws IOException{ 
    FileOutputStream fo = new FileOutputStream("D:/file2.bin"); 
    ObjectOutputStream so = new ObjectOutputStream(fo); 
    for (int i = 0; i < 100000; i++) { 
      Map<String,Integer> map = new HashMap<String, Integer>(2); 
      map.put("zhang0", i); 
      map.put("zhang1", i); 
      so.writeObject(new Simple("zhang"+i,(i+1),map)); 
    } 
    so.flush(); 
    so.close(); 
  } 
  public static void getSerializableObject(){ 
     FileInputStream fi; 
    try { 
      fi = new FileInputStream("D:/file2.bin"); 
      ObjectInputStream si = new ObjectInputStream(fi); 
      Simple simple =null; 
      while((simple=(Simple)si.readObject()) != null){ 
        //System.out.println(simple.getAge() + " " + simple.getName()); 
      } 
      fi.close(); 
      si.close(); 
    } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
    } catch (IOException e) { 
      //e.printStackTrace(); 
    } catch (ClassNotFoundException e) { 
      e.printStackTrace(); 
    } 
  } 
} 

3、kyro序列化 KyroSerializable.java

package bhz.test;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.objenesis.strategy.StdInstantiatorStrategy;
import bhz.entity.Simple;
import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.KryoException;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;
public class KyroSerializable { 
  public static void main(String[] args) throws IOException { 
    long start = System.currentTimeMillis(); 
    setSerializableObject(); 
    System.out.println("Kryo 序列化时间:" + (System.currentTimeMillis() - start) + " ms" ); 
    start = System.currentTimeMillis(); 
    getSerializableObject(); 
    System.out.println("Kryo 反序列化时间:" + (System.currentTimeMillis() - start) + " ms"); 
  } 
  public static void setSerializableObject() throws FileNotFoundException{ 
    Kryo kryo = new Kryo(); 
    kryo.setReferences(false); 
    kryo.setRegistrationRequired(false); 
    kryo.setInstantiatorStrategy(new StdInstantiatorStrategy()); 
    kryo.register(Simple.class); 
    Output output = new Output(new FileOutputStream("D:/file1.bin")); 
    for (int i = 0; i < 100000; i++) { 
      Map<String,Integer> map = new HashMap<String, Integer>(2); 
      map.put("zhang0", i); 
      map.put("zhang1", i); 
      kryo.writeObject(output, new Simple("zhang"+i,(i+1),map)); 
    } 
    output.flush(); 
    output.close(); 
  } 
  public static void getSerializableObject(){ 
    Kryo kryo = new Kryo(); 
    kryo.setReferences(false); 
    kryo.setRegistrationRequired(false); 
    kryo.setInstantiatorStrategy(new StdInstantiatorStrategy()); 
    Input input; 
    try { 
      input = new Input(new FileInputStream("D:/file1.bin")); 
      Simple simple =null; 
      while((simple=kryo.readObject(input, Simple.class)) != null){ 
        //System.out.println(simple.getAge() + " " + simple.getName() + " " + simple.getMap().toString()); 
      } 
      input.close(); 
    } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
    } catch(KryoException e){ 
    } 
  } 
}

4、测试结果对比

java原生序列化时间:8281 ms
java原生反序列化时间:5899 ms

和

Kryo 序列化时间:630 ms
Kryo 反序列化时间:15 ms

经过对比，可以发现kryo是java原生序列化性能十几倍

https://www.jb51.net/article/125245.htm