netty-jdk序列化和二进制序列化

netty-jdk序列化和二进制序列化

摘自<netty权威指南>

java序列化的目的主要有:

• 网络传输
• 对象持久化

现有POJO为UserDo:

public class UserDo implements Serializable {

	private int age;
	private String name;

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getName() {
		return name;
	}

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

	public byte[] codec() {
		ByteBuffer byteBuf = ByteBuffer.allocate(1024);
		byte[] val = this.name.getBytes();
		byteBuf.putInt(val.length);
		byteBuf.put(val);
		byteBuf.putInt(this.age);
		byteBuf.flip();
		val = null;
		byte[] rs = new byte[byteBuf.remaining()];
		byteBuf.get(rs);
		return rs;

	}

	public byte[] codec(ByteBuffer byteBuf ) {
		byteBuf.clear();
		byte[] val = this.name.getBytes();
		byteBuf.putInt(val.length);
		byteBuf.put(val);
		byteBuf.putInt(this.age);
		byteBuf.flip();
		val = null;
		byte[] rs = new byte[byteBuf.remaining()];
		byteBuf.get(rs);
		return rs;

	}
}

测试案例

public class UserDoSerializableTest {


	public static void main(String[] args) throws Exception{
		serializableTest();
		performanceTest();
	}


	private static void performanceTest() throws Exception{

		UserDo userDo = new UserDo();
		userDo.setAge(12);
		userDo.setName("netty");
		int loop = 1000000;
		long start = System.currentTimeMillis();
		ByteArrayOutputStream baos ;
		ObjectOutputStream oos;
		for (int i = 0; i < loop; i++) {
			baos = new ByteArrayOutputStream();
			oos = new ObjectOutputStream(baos);
			oos.writeObject(userDo);
			oos.flush();
			oos.close();
		}
		System.out.println("the jdk serializable cost time is "
                            +(System.currentTimeMillis()-start)+ " ms");

		start = System.currentTimeMillis();
		ByteBuffer byteBuffer = ByteBuffer.allocate(1024);
		for (int i = 0; i < loop; i++) {
			byte[] codec = userDo.codec(byteBuffer);
		}
		System.out.println("the byte array serializable cost time is "
                                    +(System.currentTimeMillis()-start)+ " ms");
	}

	private static void serializableTest() throws IOException {
		UserDo userDo = new UserDo();
		userDo.setAge(12);
		userDo.setName("netty");
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		ObjectOutputStream oos = new ObjectOutputStream(baos);
		oos.writeObject(userDo);
		oos.flush();
		oos.close();
		byte[] array = baos.toByteArray();
		System.out.println("jdk serializable length is : "+ array.length);
		baos.close();
		System.out.println("--------------------------------------------");
		System.out.println("byte array serializable length is : "+ userDo.codec().length);
	}
}

运行结果

--------serializable test----------
jdk serializable length is : 107
byte array serializable length is : 13

--------performance test----------
the jdk serializable cost time is 2883 ms
the byte array serializable cost time is 174 ms

从运行结果来看，jdk自带的序列化机制和性能都差强人意