Go语言参数校验（go-playground / validator）——自定义校验（自定义验证规则） Golang

go-playground / validator提供了以下校验：

Tag	Description
eqcsfield	Field Equals Another Field (relative)
eqfield	Field Equals Another Field
fieldcontains	NOT DOCUMENTED IN doc.go
fieldexcludes	NOT DOCUMENTED IN doc.go
gtcsfield	Field Greater Than Another Relative Field
gtecsfield	Field Greater Than or Equal To Another Relative Field
gtefield	Field Greater Than or Equal To Another Field
gtfield	Field Greater Than Another Field
ltcsfield	Less Than Another Relative Field
ltecsfield	Less Than or Equal To Another Relative Field
ltefield	Less Than or Equal To Another Field
ltfield	Less Than Another Field
necsfield	Field Does Not Equal Another Field (relative)
nefield	Field Does Not Equal Another Field

Network:

Tag	Description
cidr	Classless Inter-Domain Routing CIDR
cidrv4	Classless Inter-Domain Routing CIDRv4
cidrv6	Classless Inter-Domain Routing CIDRv6
datauri	Data URL
fqdn	Full Qualified Domain Name (FQDN)
hostname	Hostname RFC 952
hostname_port	HostPort
hostname_rfc1123	Hostname RFC 1123
ip	Internet Protocol Address IP
ip4_addr	Internet Protocol Address IPv4
ip6_addr	Internet Protocol Address IPv6
ip_addr	Internet Protocol Address IP
ipv4	Internet Protocol Address IPv4
ipv6	Internet Protocol Address IPv6
mac	Media Access Control Address MAC
tcp4_addr	Transmission Control Protocol Address TCPv4
tcp6_addr	Transmission Control Protocol Address TCPv6
tcp_addr	Transmission Control Protocol Address TCP
udp4_addr	User Datagram Protocol Address UDPv4
udp6_addr	User Datagram Protocol Address UDPv6
udp_addr	User Datagram Protocol Address UDP
unix_addr	Unix domain socket end point Address
uri	URI String
url	URL String
url_encoded	URL Encoded
urn_rfc2141	Urn RFC 2141 String

Strings:

Tag	Description
alpha	Alpha Only
alphanum	Alphanumeric
alphanumunicode	Alphanumeric Unicode
alphaunicode	Alpha Unicode
ascii	ASCII
contains	Contains
containsany	Contains Any
containsrune	Contains Rune
lowercase	Lowercase
multibyte	Multi-Byte Characters
number	NOT DOCUMENTED IN doc.go
numeric	Numeric
printascii	Printable ASCII
startswith	Starts With
uppercase	Uppercase

Format:

Tag	Description
base64	Base64 String
base64url	Base64URL String
btc_addr	Bitcoin Address
btc_addr_bech32	Bitcoin Bech32 Address (segwit)
datetime	Datetime
email	E-mail String
eth_addr	Ethereum Address
hexadecimal	Hexadecimal String
hexcolor	Hexcolor String
hsl	HSL String
hsla	HSLA String
html	HTML Tags
html_encoded	HTML Encoded
isbn	International Standard Book Number
isbn10	International Standard Book Number 10
isbn13	International Standard Book Number 13
json	JSON
latitude	Latitude
longitude	Longitude
rgb	RGB String
rgba	RGBA String
ssn	Social Security Number SSN
uuid	Universally Unique Identifier UUID
uuid3	Universally Unique Identifier UUID v3
uuid3_rfc4122	Universally Unique Identifier UUID v3 RFC4122
uuid4	Universally Unique Identifier UUID v4
uuid4_rfc4122	Universally Unique Identifier UUID v4 RFC4122
uuid5	Universally Unique Identifier UUID v5
uuid5_rfc4122	Universally Unique Identifier UUID v5 RFC4122
uuid_rfc4122	Universally Unique Identifier UUID RFC4122

Comparisons:

Tag	Description
eq	Equals
gt	Greater than
gte	Greater than or equal
lt	Less Than
lte	Less Than or Equal
ne	Not Equal

除此之前，还可以自定义校验规则，示例代码如下：

package mainimport ( "fmt" "github.com/go-playground/validator" "github.com/satori/go.uuid" "unicode/utf8" )type UserInfo struct { Idstring `validate:"uuid"`//UUID 类型 Name string `validate:"checkName"`//自定义校验 Ageuint8`validate:"min=0,max=130"` //0<=Age<=130 }//自定义校验函数 func checkName(f validator.FieldLevel) bool { // FieldLevel contains all the information and helper functions to validate a field count := utf8.RuneCountInString(f.Field().String()) //通过utf8编码，获取字符串长度 if count >= 2 && count <= 12 { return true } return false } func main() { validate := validator.New() //自定义函数checkName与 struct tag 关联起来 err := validate.RegisterValidation("checkName", checkName) if err!=nil { fmt.Println("注册失败！") return } //UUID引用：satori/go.uuid；添加方法：go get github.com/satori/go.uuid uuid := uuid.Must(uuid.NewV1()) //通过satori/go.uuid，快速生成UUID fmt.Println("UUID:",uuid) user := UserInfo{ Id:uuid.String(), Name: "jiangzhou", Age:223, } err=validate.Struct(user) if err!=nil { for _,e:=range err.(validator.ValidationErrors){ fmt.Println("错误字段：",e.Field()) fmt.Println("错误值：",e.Value()) fmt.Println("错误tag：",e.Tag()) } return } fmt.Println("校验成功") }

运行效果：
【Go语言参数校验（go-playground / validator）——自定义校验（自定义验证规则）】