MessagePack Java 0.6.X 使用一個消息打包（message-packable）類

使用註解 @Message 來讓你可以序列化你自己類中對象的 public 字段。

本代碼可以在 https://github.com/cwiki-us-demo/messagepack-6-demo-java/blob/master/src/test/java/com/insight/demo/msgpack/MessagePack6Object.java 中下載到本地後進行編譯測試。

package com.insight.demo.msgpack;

import org.junit.Test;
import org.msgpack.MessagePack;
import org.msgpack.annotation.Message;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.UUID;

import static org.junit.Assert.assertEquals;

/**

• MessagePack6Objects
  *
• @author yhu
  */

public class MessagePack6Object {

final Logger logger = LoggerFactory.getLogger(MessagePack6Object.class);

/**
 * MessageData Message Object
 */
@Message // Annotation
public static class MessageData {
    // public fields are serialized.
    public String uuid;
    public String name;
    public double version;
}

/**
 * Test MessagePack6Objects
 */
@Test
public void testMessagePack6Objects() {
    logger.debug("MessagePack6Objects for Objects");

    String uuid = UUID.randomUUID().toString();

    // INIT OBJ
    MessageData src = new MessageData();
    src.uuid = uuid;
    src.name = "MessagePack6";
    src.version = 0.6;

    try {
        MessagePack msgPack = new MessagePack();

        // Serialization
        logger.debug("------ Serialization ------");
        byte[] bytes = msgPack.write(src);
        logger.debug("Bytes Array Length: [{}]", bytes.length);

        // Deserialization
        logger.debug("------ Deserialization ------");
        MessageData dst = msgPack.read(bytes, MessageData.class);
        logger.debug("Check Object for UUID: [{}]", dst.uuid);

        assertEquals(uuid, dst.uuid);

    } catch (Exception ex) {
        logger.error("MessagePack Serialization And Deserialization error", ex);
    }
}

}

如果你希望按照順序序列化多個對象的話，你可以使用  Packer 和  Unpacker 多個對象。

這是因爲 MessagePack.write(Object) 和 read(byte[]) 實際上每次都調用創建了 Packer 和 Unpacker 對象。

爲了使用 Packer 和  Unpacker 對象，請調用 createPacker(OutputStream) 和  createUnpacker(InputStream)。

本代碼可以 https://github.com/cwiki-us-demo/messagepack-6-demo-java/blob/master/src/test/java/com/insight/demo/msgpack/MessagePack6Objects.java 中查看。

package com.insight.demo.msgpack;

import org.junit.Test;
import org.msgpack.MessagePack;
import org.msgpack.annotation.Message;
import org.msgpack.packer.Packer;
import org.msgpack.unpacker.Unpacker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.UUID;

import static org.junit.Assert.assertEquals;

/**

• MessagePack6Objects
  *
• @author yhu
  */

public class MessagePack6Objects {

final Logger logger = LoggerFactory.getLogger(MessagePack6Objects.class);

/**
 * MessageData Message Objects
 */
@Message // Annotation
public static class MessageData {
    // public fields are serialized.
    public String uuid;
    public String name;
    public double version;
}

/**
 * Test MessagePack6Objects
 */
@Test
public void testMessagePack6Objects() {
    logger.debug("MessagePack6Objects for Objects");

    String uuid = UUID.randomUUID().toString();

    // INIT OBJ
    MessageData src1 = new MessageData();
    src1.uuid = uuid;
    src1.name = "MessagePack6-src1";
    src1.version = 0.6;

    MessageData src2 = new MessageData();
    src2.uuid = uuid;
    src2.name = "MessagePack6-src2";
    src2.version = 10.6;

    MessageData src3 = new MessageData();
    src3.uuid = uuid;
    src3.name = "MessagePack6-src3";
    src3.version = 1.6;

    try {
        MessagePack msgPack = new MessagePack();

        // Serialization
        logger.debug("------ Serialization ------");
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        Packer packer = msgPack.createPacker(out);
        packer.write(src1);
        packer.write(src2);
        packer.write(src3);

        byte[] bytes = out.toByteArray();
        logger.debug("Bytes Array Length: [{}]", bytes.length);

        // Deserialization
        logger.debug("------ Deserialization ------");
        ByteArrayInputStream in = new ByteArrayInputStream(bytes);
        Unpacker unpacker = msgPack.createUnpacker(in);

        MessageData dst1 = unpacker.read(MessageData.class);
        MessageData dst2 = unpacker.read(MessageData.class);
        MessageData dst3 = unpacker.read(MessageData.class);

        logger.debug("Check Object for UUID: [{}]", dst1.uuid);

        assertEquals(uuid, dst1.uuid);

    } catch (Exception ex) {
        logger.error("MessagePack Serialization And Deserialization error", ex);
    }
}

}

https://www.cwiki.us/display/Serialization/QuickStart+For+MessagePack+Java+0.6.X