Hession2 序列化Byte--反序列化為Integer 預設

Hession2 序列化Byte--反序列化為Integer 預設（arbitrary object）情況。自定義型別反序列化則不會改變Byte型別

            /**
             * test Byte
             */
            ByteArrayOutputStream outputStream = new ByteArrayOutputStream(1024);
            Hessian2ObjectOutput h2o = new Hessian2ObjectOutput(outputStream);
            h2o.writeObject(new Byte("9"));//Byte 型別
            h2o.flushBuffer();
            outputStream.flush();
            byte[] testByte = outputStream.toByteArray();
            System.out.println(testByte + "---hession2+byte---" + testByte.length);
            ByteBufInputStream in = new ByteBufInputStream(Unpooled.buffer().writeBytes(testByte));
            Hessian2ObjectInput ino = new Hessian2ObjectInput(in);
            //Hessian2ObjectInput ino = new Hessian2ObjectInput(new ByteArrayInputStream(testByte));
            Object byteobj = ino.readObject();
            System.out.println(byteobj.getClass());// Integer 型別
            System.out.println(byteobj);

驗證結果

[B@1189dd52---hession2+byte---1
class java.lang.Integer
9

原因：

/**
   * Reads an arbitrary object from the input stream when the type
   * is unknown.
   */
  public Object readObject()
    throws IOException
  {
    int tag = _offset < _length ? (_buffer[_offset++] & 0xff) : read();

    switch (tag) {
    case 'N':
      return null;
      
    case 'T':
      return Boolean.valueOf(true);
      
    case 'F':
      return Boolean.valueOf(false);

      // direct integer
    case 0x80: case 0x81: case 0x82: case 0x83:
    case 0x84: case 0x85: case 0x86: case 0x87:
    case 0x88: case 0x89: case 0x8a: case 0x8b:
    case 0x8c: case 0x8d: case 0x8e: case 0x8f:
      
    case 0x90: case 0x91: case 0x92: case 0x93:
    case 0x94: case 0x95: case 0x96: case 0x97:
    case 0x98: case 0x99: case 0x9a: case 0x9b:
    case 0x9c: case 0x9d: case 0x9e: case 0x9f:
      
    case 0xa0: case 0xa1: case 0xa2: case 0xa3:
    case 0xa4: case 0xa5: case 0xa6: case 0xa7:
    case 0xa8: case 0xa9: case 0xaa: case 0xab:
    case 0xac: case 0xad: case 0xae: case 0xaf:
      
    case 0xb0: case 0xb1: case 0xb2: case 0xb3:
    case 0xb4: case 0xb5: case 0xb6: case 0xb7:
    case 0xb8: case 0xb9: case 0xba: case 0xbb:
    case 0xbc: case 0xbd: case 0xbe: case 0xbf:
      return Integer.valueOf(tag - BC_INT_ZERO);

      /* byte int */
    case 0xc0: case 0xc1: case 0xc2: case 0xc3:
    case 0xc4: case 0xc5: case 0xc6: case 0xc7:
    case 0xc8: case 0xc9: case 0xca: case 0xcb:
    case 0xcc: case 0xcd: case 0xce: case 0xcf:
    return Integer.valueOf(((tag - BC_INT_BYTE_ZERO) << 8) + read());
      後面省略...

自定義型別

      UnsafeByteArrayOutputStream bos = new UnsafeByteArrayOutputStream(1024);
        ObjectOutput out = new Hessian2ObjectOutput(bos);

        try {
            out.writeObject(new mmm("山東", "濱州", 1002,new Byte("45")));
            out.flushBuffer();
            bos.flush();
            byte[] data = bos.toByteArray();
            System.out.println(String.valueOf(data));

            System.out.println(mmm.class.getClassLoader());

            ByteBuf buf = Unpooled.directBuffer();
            ByteBuf byteBuf = buf.writeBytes(data);
            ByteBufInputStream stream = new ByteBufInputStream(byteBuf);

            ByteSink sink = Files.asByteSink(new File("/Users/xiayin/123.txt"), FileWriteMode.APPEND);
            ByteSink sink1 = Files.asByteSink(new File("/Users/xiayin/456.txt"), FileWriteMode.APPEND);
            sink.write(data);


            Hessian2ObjectInput objectInput = new Hessian2ObjectInput(stream);
            Object o = objectInput.readObject();
            System.out.println("hession2-----" + data.length);
            System.out.println(JacksonSupport.toJson(o));
            System.out.println(o.getClass());
            System.out.println(o.getClass().getDeclaredField("DD").getType());}//不會改變的。因為使用classLoader 載入類型別，進行反序列化。

static class mmm implements Serializable {
        private static final long serialVersionUID = 7214221008502796951L;
        private String AA;
        private String BB;
        private int CC;
        private Byte DD;

        public mmm(String AA, String BB, int CC, Byte DD) {
            this.AA = AA;
            this.BB = BB;
            this.CC = CC;
            this.DD = DD;
        }