【Kryo】简单地使用Kryo

公司用Kryo，先接触下，简单记录下。

引入包

    <dependencies>
		<dependency>
			<groupId>com.esotericsoftware</groupId>
			<artifactId>kryo</artifactId>
			<version>3.0.3</version>
		</dependency>

		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
		</dependency>
	</dependencies>

简单的使用

实体对象：

import java.io.Serializable;

public class User implements Serializable {

    private Integer id;
	private String name;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	@Override
	public String toString() {
		return "User [id=" + id + ", name=" + name + "]";
	}

}

使用kryo序列化和反序列化：

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

import org.junit.Test;

import com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;

public class HowToUse {

    @Test
	public void output() throws FileNotFoundException {
		User user = new User();
		user.setId(100);
		user.setName("Nick Huang");

		try (Output output = new Output(new FileOutputStream("d:/binary/user.bin"))) {
			Kryo kryo = new Kryo();
			kryo.writeObject(output, user);
		}
	}

	@Test
	public void input() throws FileNotFoundException {
		try (Input input = new Input(new FileInputStream("d:/binary/user.bin"))) {
			Kryo kryo = new Kryo();
			User user = kryo.readObject(input, User.class);
			System.out.println(user);
		}
	}

}

简单地和JDK自带序列化和反序列化对比

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 com.esotericsoftware.kryo.Kryo;
import com.esotericsoftware.kryo.io.Input;
import com.esotericsoftware.kryo.io.Output;

public class Compare {

	public static void main(String[] args) throws Exception {
		outputByKryo();
		inputByKryo();
		outputByJdk();
		inputByJdk();
	}

	public static void outputByKryo() throws FileNotFoundException {
		long startTime = System.currentTimeMillis();
		for (int i = 10000; i < 20000; i++) {
			User user = new User();
			user.setId(i);
			user.setName("Nick Huang");

			try (Output output = new Output(new FileOutputStream("d:/binary/user" + i + ".bin"))) {
				Kryo kryo = new Kryo();
				kryo.writeObject(output, user);
			}
		}
		System.out.println("outputByKryo cost : " + (System.currentTimeMillis() - startTime));
	}

	public static void inputByKryo() throws FileNotFoundException {
		long startTime = System.currentTimeMillis();
		for (int i = 10000; i < 20000; i++) {
			try (Input input = new Input(new FileInputStream("d:/binary/user" + i + ".bin"))) {
				Kryo kryo = new Kryo();
				User user = kryo.readObject(input, User.class);
			}
		}
		System.out.println("inputByKryo cost : " + (System.currentTimeMillis() - startTime));
	}

	public static void outputByJdk() throws IOException {
		long startTime = System.currentTimeMillis();
		for (int i = 20000; i < 30000; i++) {
			User user = new User();
			user.setId(i);
			user.setName("Nick Huang");

			try (ObjectOutputStream output = new ObjectOutputStream(new FileOutputStream("d:/binary/user" + i + ".bin"))) {
				output.writeObject(user);
			}
		}
		System.out.println("outputByJdk cost : " + (System.currentTimeMillis() - startTime));
	}

	public static void inputByJdk() throws IOException, ClassNotFoundException {
		long startTime = System.currentTimeMillis();
		for (int i = 20000; i < 30000; i++) {
			try (ObjectInputStream input = new ObjectInputStream(new FileInputStream("d:/binary/user" + i + ".bin"))) {
				User user = (User)input.readObject();
			}
		}
		System.out.println("inputByJdk cost : " + (System.currentTimeMillis() - startTime));
	}

}

日志：

outputByKryo cost : 5856
inputByKryo cost : 516
outputByJdk cost : 7494
inputByJdk cost : 1142