1、无法跨语言

2、性能差

import java.io.Serializable;
import java.nio.ByteBuffer;
public class UserInfo implements Serializable {
    private static final long serialVersionUID = 1L;

    private Long id;

    private String name;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public byte[] codeC() {
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        byte[] value = this.name.getBytes();
        buffer.putInt(value.length);
        buffer.put(value);
        buffer.putLong(this.id);
        buffer.flip();
        byte[] result = new byte[buffer.remaining()];
        buffer.get(result);
        return result;
    }

    public byte[] codeC(ByteBuffer buffer) {
        buffer.clear();
        byte[] value = this.name.getBytes();
        buffer.putInt(value.length);
        buffer.put(value);
        buffer.putLong(this.id);
        buffer.flip();
        byte[] result = new byte[buffer.remaining()];
        buffer.get(result);
        return result;
    }

}

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;
import java.nio.ByteBuffer;

public class MainTest {

    public static void main(String[] args) throws Exception {
        UserInfo info = new UserInfo();
        info.setId(1L);
        info.setName("Tom");

        int loop = 100_0000;
        ByteArrayOutputStream bout = null;
        ObjectOutputStream out = null;
        long start = System.currentTimeMillis();
        for (int i = 0; i < loop; i  ) {
            bout = new ByteArrayOutputStream();
            out = new ObjectOutputStream(bout);
            out.flush();
            out.close();
            byte[] b = bout.toByteArray();
            bout.close();
        }
        System.out.println("jdk serializable time : "   (System.currentTimeMillis() - start)   " ms");

        System.out.println("------------------------------");

        start = System.currentTimeMillis();
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        for (int i = 0; i < loop; i  ) {
            byte[] bytes = info.codeC(buffer);
        }
        System.out.println("ByteBuffer time : "   (System.currentTimeMillis() - start)   " ms");
    }
}

3、序列后的码流太大

import java.io.ByteArrayOutputStream;
import java.io.ObjectOutputStream;

public class MainTest {

    public static void main(String[] args) throws Exception {
        UserInfo info = new UserInfo();
        info.setId(1L);
        info.setName("Tom");
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream out = new ObjectOutputStream(bout);
        out.writeObject(info);
        out.flush();
        out.close();
        byte[] b = bout.toByteArray();
        System.out.println("jdk serializable: "   b.length);
        bout.close();
        System.out.println("ByteBuffer : "   info.codeC().length);
    }
}

Protobuf

Thrift

Jackson

Gson

FastJson

 
  END
 


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