Java原生序列化和Kryo序列化性能比较
1.背景
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（。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
2、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;
}
}3、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();
}
}
}4、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){
}
}
}5、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
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原始发表：2019-03-03，如有侵权请联系 cloudcommunity@tencent.com 删除
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