golang 将[]byte转成16进制的实现
将[]byte转成16进制
import"crypto/md5"
import"fmt"
sign:=md5.Sum([]byte("datestring"))
signStr:=fmt.Sprintf("%x",sign)//将[]byte转成16进制
补充：golang[]byte存储存储的16进制转10进制
项目中有用[]byte存储16进制需要转到10进制，如果用系统自带的函数处理，需要先将[]byte通过hex.EncodeToString转为string，再用strconv.ParseInt转到10进制，过程中由于两次转换导致内存分配过多（每秒执行近100w次），GC出现错误导致进程挂掉。
自己写了一个函数来转，主要是避免出现内存泄漏：
varb2m_mapmap[byte]uint64=map[byte]uint64{
0x00:0,
0x01:1,
0x02:2,
0x03:3,
0x04:4,
0x05:5,
0x06:6,
0x07:7,
0x08:8,
0x09:9,
0x0A:10,
0x0B:11,
0x0C:12,
0x0D:13,
0x0E:14,
0x0F:15,
0x10:16,
0x11:17,
0x12:18,
0x13:19,
0x14:20,
0x15:21,
0x16:22,
0x17:23,
0x18:24,
0x19:25,
0x1A:26,
0x1B:27,
0x1C:28,
0x1D:29,
0x1E:30,
0x1F:31,
0x20:32,
0x21:33,
0x22:34,
0x23:35,
0x24:36,
0x25:37,
0x26:38,
0x27:39,
0x28:40,
0x29:41,
0x2A:42,
0x2B:43,
0x2C:44,
0x2D:45,
0x2E:46,
0x2F:47,
0x30:48,
0x31:49,
0x32:50,
0x33:51,
0x34:52,
0x35:53,
0x36:54,
0x37:55,
0x38:56,
0x39:57,
0x3A:58,
0x3B:59,
0x3C:60,
0x3D:61,
0x3E:62,
0x3F:63,
0x40:64,
0x41:65,
0x42:66,
0x43:67,
0x44:68,
0x45:69,
0x46:70,
0x47:71,
0x48:72,
0x49:73,
0x4A:74,
0x4B:75,
0x4C:76,
0x4D:77,
0x4E:78,
0x4F:79,
0x50:80,
0x51:81,
0x52:82,
0x53:83,
0x54:84,
0x55:85,
0x56:86,
0x57:87,
0x58:88,
0x59:89,
0x5A:90,
0x5B:91,
0x5C:92,
0x5D:93,
0x5E:94,
0x5F:95,
0x60:96,
0x61:97,
0x62:98,
0x63:99,
0x64:100,
0x65:101,
0x66:102,
0x67:103,
0x68:104,
0x69:105,
0x6A:106,
0x6B:107,
0x6C:108,
0x6D:109,
0x6E:110,
0x6F:111,
0x70:112,
0x71:113,
0x72:114,
0x73:115,
0x74:116,
0x75:117,
0x76:118,
0x77:119,
0x78:120,
0x79:121,
0x7A:122,
0x7B:123,
0x7C:124,
0x7D:125,
0x7E:126,
0x7F:127,
0x80:128,
0x81:129,
0x82:130,
0x83:131,
0x84:132,
0x85:133,
0x86:134,
0x87:135,
0x88:136,
0x89:137,
0x8A:138,
0x8B:139,
0x8C:140,
0x8D:141,
0x8E:142,
0x8F:143,
0x90:144,
0x91:145,
0x92:146,
0x93:147,
0x94:148,
0x95:149,
0x96:150,
0x97:151,
0x98:152,
0x99:153,
0x9A:154,
0x9B:155,
0x9C:156,
0x9D:157,
0x9E:158,
0x9F:159,
0xA0:160,
0xA1:161,
0xA2:162,
0xA3:163,
0xA4:164,
0xA5:165,
0xA6:166,
0xA7:167,
0xA8:168,
0xA9:169,
0xAA:170,
0xAB:171,
0xAC:172,
0xAD:173,
0xAE:174,
0xAF:175,
0xB0:176,
0xB1:177,
0xB2:178,
0xB3:179,
0xB4:180,
0xB5:181,
0xB6:182,
0xB7:183,
0xB8:184,
0xB9:185,
0xBA:186,
0xBB:187,
0xBC:188,
0xBD:189,
0xBE:190,
0xBF:191,
0xC0:192,
0xC1:193,
0xC2:194,
0xC3:195,
0xC4:196,
0xC5:197,
0xC6:198,
0xC7:199,
0xC8:200,
0xC9:201,
0xCA:202,
0xCB:203,
0xCC:204,
0xCD:205,
0xCE:206,
0xCF:207,
0xD0:208,
0xD1:209,
0xD2:210,
0xD3:211,
0xD4:212,
0xD5:213,
0xD6:214,
0xD7:215,
0xD8:216,
0xD9:217,
0xDA:218,
0xDB:219,
0xDC:220,
0xDD:221,
0xDE:222,
0xDF:223,
0xE0:224,
0xE1:225,
0xE2:226,
0xE3:227,
0xE4:228,
0xE5:229,
0xE6:230,
0xE7:231,
0xE8:232,
0xE9:233,
0xEA:234,
0xEB:235,
0xEC:236,
0xED:237,
0xEE:238,
0xEF:239,
0xF0:240,
0xF1:241,
0xF2:242,
0xF3:243,
0xF4:244,
0xF5:245,
0xF6:246,
0xF7:247,
0xF8:248,
0xF9:249,
0xFA:250,
0xFB:251,
0xFC:252,
0xFD:253,
0xFE:254,
0xFF:255,
}
funchex2int(hexB*[]byte)uint64{
varretIntuint64
hexLen:=len(*hexB)
fork,v:=range*hexB{
retInt+=b2m_map[v]*exponent(16,uint64(2*(hexLen-k-1)))
}
returnretInt
}
funcexponent(a,nuint64)uint64{
result:=uint64(1)
fori:=n;i>0;i>>=1{
ifi&1!=0{
result*=a
}
a*=a
}
returnresult
}
经过测试，性能和自带的方法接近，略有提升。
goos:windows goarch:amd64 pkg:benchmark Benchmark_General-4 10000000 144ns/op Benchmark_Better-4 10000000 128ns/op PASS ok benchmark 3.086s
以上为个人经验，希望能给大家一个参考，也希望大家多多支持毛票票。如有错误或未考虑完全的地方，望不吝赐教。