golang实现java uuid的序列化

EasyNetCN · · 350 次点击 · · 开始浏览

这是一个创建于的文章，其中的信息可能已经有所发展或是发生改变。

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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