golang实现java uuid的序列化方法_Java

golang实现java uuid的序列化方法

目前只实现了java生成的固定的uuid：85bb94b8-fd4b-4e1c-8f49-3cedd49d8f28的序列化

package main

import (
  "encoding/binary"
  "encoding/json"
  "fmt"
  "log"
  "os"
  "strings"
  "time"

  "github.com/shopify/sarama"
  "github.com/google/uuid"
)

const (
  date_time_pattern = ""
  stream_magic   = 0xaced
  stream_version  = 5
  tc_string     = 0x74
  tc_object     = 0x73
  tc_classdesc   = 0x72
  sc_serializable  = 0x02
  tc_endblockdata  = 0x78
  tc_null      = 0x70
)

func main() {
  uuidtest()
}

func uuidtest() {
  f, _ := os.create("uuid-go.out")
  defer f.close()

  f.write(shortbytes(stream_magic))
  f.write(shortbytes(stream_version))
  f.write([]byte{tc_object})
  f.write([]byte{tc_classdesc})

  classname := "java.util.uuid"
  classnamelen := len(classname)

  f.write(shortbytes(uint16(classnamelen)))
  f.write([]byte(classname))

  sid := -4856846361193249489

  f.write(longbytes(uint64(sid)))

  //flags
  f.write([]byte{2})

  //fields length
  f.write(shortbytes(2))

  //field type code
  f.write([]byte{'j'})

  f1 := "leastsigbits"
  f1len := len(f1)

  f.write(shortbytes(uint16(f1len)))
  f.write([]byte(f1))

  //filed type code
  f.write([]byte{'j'})

  f2 := "mostsigbits"
  f2len := len(f2)

  f.write(shortbytes(uint16(f2len)))
  f.write([]byte(f2))

  f.write([]byte{tc_endblockdata})
  f.write([]byte{tc_null})

  leastsigbits := -8121893460813967576

  f.write(longbytes(uint64(leastsigbits)))

  mostsigbits := -8810284723775779300

  f.write(longbytes(uint64(mostsigbits)))

}

func shortbytes(i uint16) []byte {
  bytes := make([]byte, 2)

  binary.bigendian.putuint16(bytes, i)

  return bytes
}

func longbytes(i uint64) []byte {
  bytes := make([]byte, 8)

  binary.bigendian.putuint64(bytes, i)

  return bytes
}

func bigendian() { // 大端序
  // 二进制形式：0000 0000 0000 0000 0001 0002 0003 0004
  var testint int32 = 0x01020304 // 十六进制表示
  fmt.printf("%d use big endian: \n", testint)

  var testbytes []byte = make([]byte, 4)
  binary.bigendian.putuint32(testbytes, uint32(testint)) //大端序模式
  fmt.println("int32 to bytes:", testbytes)

  convint := binary.bigendian.uint32(testbytes) //大端序模式的字节转为int32
  fmt.printf("bytes to int32: %d\n\n", convint)
}

func littleendian() { // 小端序
  //二进制形式： 0000 0000 0000 0000 0001 0002 0003 0004
  var testint int32 = 0x01020304 // 16进制
  fmt.printf("%d use little endian: \n", testint)

  var testbytes []byte = make([]byte, 4)
  binary.littleendian.putuint32(testbytes, uint32(testint)) //小端序模式
  fmt.println("int32 to bytes:", testbytes)

  convint := binary.littleendian.uint32(testbytes) //小端序模式的字节转换
  fmt.printf("bytes to int32: %d\n\n", convint)
}

func int64tobytes(i int64) []byte {
  var buf = make([]byte, 8)
  binary.bigendian.putuint64(buf, uint64(i))
  return buf
}

java读取测试

public class test {

  public static void main(string[] args) throws ioexception, classnotfoundexception {
    readuuidtest();
  }

  private static void readuuidtest() throws ioexception, classnotfoundexception {
    try (var fis = new fileinputstream("uuid-go.out"); var is = new objectinputstream(fis)) {
      var uuid = is.readobject();

      system.out.print(uuid);

    }
  }
}

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