YAML(YAML 不是标记语言)是一种人类可读的数据序列化语言。它通常用于配置文件，但也用于数据存储或传输。YAML 本身支持三种基本数据类型：标量(例如字符串、整数和浮点数)、列表和映射(字典/哈希)。我们使用 yaml.v3 包来解析yaml文件
go get gopkg.in/yaml.v3
解析yaml
func Unmarshal(in []byte, out interface{}) (err error)
我们使用 Unmarshal来解析yaml yaml文件内容如下：
– name: wanger
age: 24
address: beijing
hobby:
– literature
– social
– name: 冬哥
age: 30
address: chengdu
hobby:
– basketball
– guitar
– name: 华子
age: 27
address: shenzhen
hobby:
– 王者荣耀
– name: 乔克
age: 29
address: chongqing
hobby:
– 阅读
– 王者荣耀
– name: 夏老师
age: 27
address: chengdu
hobby:
– 吃吃喝喝
– name: 姜总
age: 25
address: shanghai
hobby:
– talkshow
– name: 郑哥
age: 30
address: beijing
hobby:
– 阅读
– 复读机
读取test.yaml
package main
import (
"fmt"
"gopkg.in/yaml.v2"
"io/ioutil"
"gopkg.in/yaml.v3"
"log"
)
type Users struct {
Name string `yaml:"name"`
Age int8 `yaml:"age"`
Address string `yaml:"address"`
Hobby []string `yaml:"hobby"`
}
func main() {
file, err := ioutil.ReadFile("test.yaml")
if err != nil {
log.Fatal(err)
}
var data [7]Users
err2 := yaml.Unmarshal(file, &data)
if err2 != nil {
log.Fatal(err2)
}
for _, v := range data {
fmt.Println(v)
}
}
输出内容如下
{wanger 24 beijing [literature social]}
{冬哥 30 chengdu [basketball guitar]}
{华子 27 shenzhen [王者荣耀]}
{乔克 29 chongqing [阅读 王者荣耀]}
{夏老师 27 chengdu [吃吃喝喝]}
{姜总 25 shanghai [钓鱼 音乐 美食 酒talkshow]}
{郑哥 30 beijing [阅读 复读机]}
生成yaml
func Marshal(in interface{}) (out []byte, err error)
我们使用 Marshal来生成yaml，生成一个关于我们团队信息的yaml文件吧 可以通过定义结构体yaml标签来自定义输出的yaml文件的键名
package main
import (
"fmt"
"gopkg.in/yaml.v3"
)
type Users struct {
Name string `yaml:"name"`
Age int8 `yaml:"age"`
Address string `yaml:"address"`
Hobby []string `yaml:"hobby"`
}
func main() {
wanger := Users{
Name: "wanger",
Age: 24,
Address: "beijing",
Hobby: []string{"literature", "social"},
}
dongdong := Users{
Name: "冬哥",
Age: 30,
Address: "chengdu",
Hobby: []string{"basketball", "guitar"},
}
xialaoshi := Users{
Name: "夏老师",
Age: 29,
Address: "chengdu",
Hobby: []string{"吃吃喝喝"},
}
huazai := Users{
Name: "华子",
Age: 28,
Address: "shenzhen",
Hobby: []string{"王者荣耀"},
}
qiaoke := Users{
Name: "乔克",
Age: 30,
Address: "chongqing",
Hobby: []string{"阅读", "王者荣耀"},
}
jiangzong := Users{
Name: "姜总",
Age: 25,
Address: "shanghai",
Hobby: []string{"钓鱼","音乐","美食","酒"},
}
zhengge := Users{
Name: "郑哥",
Age: 30,
Address: "beijing",
Hobby: []string{"阅读", "复读机"},
}
userlist:=[7]Users{wanger,dongdong,huazai,qiaoke,xialaoshi,jiangzong,zhengge}
yamlData, err := yaml.Marshal(&userlist)
if err != nil {
fmt.Printf("Error while Marshaling. %v", err)
}
fmt.Println(string(yamlData))
fileName := "test.yaml"
err = ioutil.WriteFile(fileName, yamlData, 0644)
if err != nil {
panic("Unable to write data into the file")
}
}
生成的yaml信息如下
– name: wanger
age: 24
address: beijing
hobby:
– literature
– social
– name: 冬哥
age: 30
address: chengdu
hobby:
– basketball
– guitar
– name: 华子
age: 27
address: shenzhen
hobby:
– 王者荣耀
– name: 乔克
age: 29
address: chongqing
hobby:
– 阅读
– 王者荣耀
– name: 夏老师
age: 27
address: chengdu
hobby:
– 吃吃喝喝
– name: 姜总
age: 25
address: shanghai
hobby:
– 钓鱼
– 音乐
– 美食
– 酒
– name: 郑哥
age: 30
address: beijing
hobby:
– 阅读
– 复读机
解析和生成json文件
我们使用encoding/json标准库包来实现json文件的解析与生成
读取和解析json文件
func Unmarshal(data []byte, v interface{}) error
我这里定义了一个user.json文件
{
"users": [
{
"name": "wanger",
"address": "beijing",
"age": 24,
"social": {
"mobile": "111111111",
"email": "wanger@163.com"
}
},
{
"name": "dongdong",
"address": "chengdu",
"age": 30,
"social": {
"mobile": "2222222222222222",
"emial": "dongdong@163.com"
}
},
{
"name": "夏老师",
"address": "chengdu",
"age": 29,
"social": {
"mobile": "2232222222222222",
"emial": "xialaoshi@163.com"
}
},
{
"name": "郑哥",
"address": "beijing",
"age": 30,
"social": {
"mobile": "12222211111",
"email": "zhengge@163.com"
}
},
{
"name": "姜总",
"address": "shanghai",
"age": 25,
"social": {
"mobile": "111122211",
"email": "jaingzong@163.com"
}
},
{
"name": "乔克",
"address": "chongqing",
"age": 30,
"social": {
"mobile": "11333331111111",
"email": "qiaoke@163.com"
}
},
{
"name": "华仔",
"address": "shenzhen",
"age": 28,
"social": {
"mobile": "113311111",
"email": "huazai@163.com"
}
}
]
}
读取user.json文件
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"strconv"
)
func main() {
jsonFile,err:=os.Open("user.json")
if err != nil {
fmt.Println(err)
}
fmt.Println("Successfully Opened users.json")
defer jsonFile.Close()
byteValue,_:=ioutil.ReadAll(jsonFile)
var users Users
json.Unmarshal(byteValue,&users)
for i :=0;i<len(users.Users);i++ {
fmt.Println("User Type: "+ users.Users[i].Address)
fmt.Println("User Age: "+strconv.Itoa(users.Users[i].Age))
fmt.Println("User Name: "+users.Users[i].Name)
fmt.Println("User Email: "+users.Users[i].Social.Email)
}
var result Users
json.Unmarshal(byteValue,&result)
}
type Users struct {
Users []User `json:"users"`
}
type User struct {
Name string `json:"name"`
Address string `json:"address"`
Age int `json:"Age"`
Social Social `json:"social"`
}
type Social struct {
Mobile string `json:"mobile"`
Email string `json:"email"`
}
输出结果如下
Successfully Opened users.json
User Type: beijing
User Age: 24
User Name: wanger
User Email: wanger@163.com
User Type: chengdu
User Age: 30
User Name: dongdong
User Email:
User Type: chengdu
User Age: 28
User Name: 夏老师
User Email:
User Type: beijing
User Age: 30
User Name: 郑哥
User Email: zhengge@163.com
User Type: shanghai
User Age: 25
User Name: 姜总
User Email: jaingzong@163.com
User Type: chongqing
User Age: 29
User Name: 乔克
User Email: qiaoke@163.com
User Type: shenzhen
User Age: 28
User Name: 华仔
User Email: huazai@163.com
当然有时候我们可能不知道要读取的json数据结构，这就没办法预定义结构体，那么我们可以使用**map[string]interface{}**类型来解析json。
var result map[string]interface{}
err = json.Unmarshal(byteValue, &result)
fmt.Printf("%+v\n", result)
输出信息如下：
map[users:[map[address:beijing age:24 name:wanger social:map[email:wanger@163.com mobile:111111]] map[address:chengdu age:30 name:dongdong social:map[emial:dongdong@163.com mobil222222222222222]] map[address:chengdu age:28 name:夏老师 social:map[emial:xialaoshi@163.cmobile:2232222222222222]] map[address:beijing age:30 name:郑哥 social:map[email:zhengge@1com mobile:12222211111]] map[address:shanghai age:25 name:姜总 social:map[email:jaingzong3.com mobile:111122211]] map[address:chongqing age:29 name:乔克 social:map[email:qiaoke@1com mobile:11333331111111]] map[address:shenzhen age:28 name:华仔 social:map[email:huazai3.com mobile:113311111]]]]
生成json文件
func Marshal(v interface{}) ([]byte, error)
package main
import (
"encoding/json"
"fmt"
"io/ioutil"
)
func main() {
wanger:=User{Address:"beijing",Name:"wanger",Age:24,Social:Social{Email:"wanger@163.com",Mobile:"111111111111"}}
huazi:=User{Address:"shenzhen",Name:"huazai",Age:28,Social:Social{Email:"huazai@163.com",Mobile:"111122211111"}}
qiaoke:=User{Address:"chongqing",Name:"qiaoke",Age:30,Social:Social{Email:"qiaoke@163.com",Mobile:"13332211111"}}
xialaoshi:=User{Address:"chengdu",Name:"夏老师",Age:29,Social:Social{Email:"xialaoshi@163.com",Mobile:"11144445411111"}}
jiangzong:=User{Address:"shanghai",Name:"姜总",Age:25,Social:Social{Email:"jiangzong@163.com",Mobile:"111222445211111"}}
dongdong:=User{Address:"chengdu",Name:"冬哥",Age:30,Social:Social{Email:"dongdong@163.com",Mobile:"1155555211111"}}
zhengge:=User{Address:"beijing",Name:"郑哥",Age:24,Social:Social{Email:"zhengge@163.com",Mobile:"1112224566211111"}}
result:=Users{Users: []User{wanger,huazi,jiangzong,xialaoshi,qiaoke,dongdong,zhengge}}
bytearray,err:=json.Marshal(result)
if err!=nil {
fmt.Println(err)
}
fmt.Println(string(bytearray))
fileName := "user.json"
err = ioutil.WriteFile(fileName, bytearray, 0644)
if err != nil {
panic("Unable to write data into the file")
}
}
type Users struct {
Users []User `json:"users"`
}
type User struct {
Name string `json:"name"`
Address string `json:"address"`
Age int `json:"Age"`
Social Social `json:"social"`
}
type Social struct {
Mobile string `json:"mobile"`
Email string `json:"email"`
}
输出内容如下
{"users":[{"name":"wanger","address":"beijing","Age":24,"social":{"mobile":"111111111111","email":"wanger@163.com"}},{"name":"huazai","address":"shenzhen","Age":28,"social":{"mobile":"111122211111","email":"huazai@163.com"}},{"name":"姜总","address":"shanghai","Age":25,"social":{"mobile":"111222445211111","email":"jiangzong@163.com"}},{"name":"夏老师","address":"chengdu","Age":29,"social":{"mobile":"11144445411111","email":"xialaoshi@163.com"}},{"name":"qiaoke","address":"chongqing","Age":30,"social":{"mobile":"13332211111","email":"qiaoke@163.com"}},{"name":"冬哥","address":"chengdu","Age":30,"social":{"mobile":"1155555211111","email":"dongdong@163.com"}},{"name":"郑哥","address":"beijing","Age":24,"social":{"mobile":"1112224566211111","email":"zhengge@163.com"}}]}
可以看出上面输出的json并不是很美观，可以使用更易读的函数**json.MarshalIndent()**函数，MarshalIndent()可以定义输出的前缀和缩进
bytearray,err:=json.MarshalIndent(result,""," ")
if err!=nil {
fmt.Println(err)
}
fmt.Println(string(bytearray))
输出内容如下，比之前看起来好多了
{
"users": [
{
"name": "wanger",
"address": "beijing",
"Age": 24,
"social": {
"mobile": "111111111111",
"email": "wanger@163.com"
}
},
{
"name": "huazai",
"address": "shenzhen",
"Age": 28,
"social": {
"mobile": "111122211111",
"email": "huazai@163.com"
}
},
{
"name": "姜总",
"address": "shanghai",
"Age": 25,
"social": {
"mobile": "111222445211111",
"email": "jiangzong@163.com"
}
},
{
"name": "夏老师",
"address": "chengdu",
"Age": 29,
"social": {
"mobile": "11144445411111",
"email": "xialaoshi@163.com"
}
},
{
"name": "qiaoke",
"address": "chongqing",
"Age": 30,
"social": {
"mobile": "13332211111",
"email": "qiaoke@163.com"
}
},
{
"name": "冬哥",
"address": "chengdu",
"Age": 30,
"social": {
"mobile": "1155555211111",
"email": "dongdong@163.com"
}
},
{
"name": "郑哥",
"address": "beijing",
"Age": 24,
"social": {
"mobile": "1112224566211111",
"email": "zhengge@163.com"
}
}
]
}
解析和生成xml文件
解析xml文件
func Unmarshal(data []byte, v interface{}) error
定义一个user.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<users>
<user address="beijing">
<name>wanger</name>
<age>24</age>
<social>
<email>wanger@163.com</email>
<mobile>1233455464</mobile>
</social>
</user>
<user address="chengdu">
<name>冬哥</name>
<age>30</age>
<social>
<email>dongge@163.com</email>
<mobile>12245555464</mobile>
</social>
</user>
<user address="chengdu">
<name>夏老师</name>
<age>29</age>
<social>
<email>xialaoshi@163.com</email>
<mobile>12335677464</mobile>
</social>
</user>
<user address="beijing">
<name>郑哥</name>
<age>30</age>
<social>
<email>zhengge@163.com</email>
<mobile>12334355464</mobile>
</social>
</user>
<user address="shanghai">
<name>姜总</name>
<age>25</age>
<social>
<email>jiangzong@163.com</email>
<mobile>123565455464</mobile>
</social>
</user>
<user address="chongqing">
<name>乔克</name>
<age>29</age>
<social>
<email>qiaoke@163.com</email>
<mobile>124676755464</mobile>
</social>
</user>
<user address="shenzhen">
<name>华仔</name>
<age>28</age>
<social>
<email>huazai@163.com</email>
<mobile>1238655464</mobile>
</social>
</user>
</users>
解析xml文件 address,attr意味着该address字段是一个XML属性而不是一个嵌套元素。如果结构体有一个名为 XMLName 的 Name 类型的字段，Unmarshal 在该字段中记录元素名称。
为了正确解析，go 语言的 xml 包要求 struct 定义中的所有字段必须是可导出的(即首字母大写)
package main
import (
"encoding/xml"
"fmt"
"io/ioutil"
"os"
)
func main() {
xmlFile,err:=os.Open("users.xml")
if err!=nil {
fmt.Println(err)
}
fmt.Println("successfully opened users.xml")
defer xmlFile.Close()
byteValue,_:=ioutil.ReadAll(xmlFile)
var users Users
xml.Unmarshal(byteValue,&users)
for i :=0;i<len(users.Users);i++ {
fmt.Println("User Address: "+users.Users[i].Address)
fmt.Println("User Name: "+users.Users[i].Name)
fmt.Println("Facebook Url: "+users.Users[i].Social.Email)
}
}
type Users struct {
XMLName xml.Name `xml:"users"`
Users []User `xml:"user"`
}
type User struct {
XMLName xml.Name `xml:"user"`
Address string `xml:"address,attr"`
Name string `xml:"name"`
Social Social `xml:"social"`
}
type Social struct {
XMLName xml.Name `xml:"social"`
Mobile string `xml:"mobile"`
Email string `xml:"email"`
}
输出结果如下：
successfully opened users.xml
User Address: beijing
User Name: wanger
Facebook Url: wanger@163.com
User Address: chengdu
User Name: 冬哥
Facebook Url: dongge@163.com
User Address: chengdu
User Name: 夏老师
Facebook Url: xialaoshi@163.com
User Address: beijing
User Name: 郑哥
Facebook Url: zhengge@163.com
User Address: shanghai
User Name: 姜总
Facebook Url: jiangzong@163.com
User Address: chongqing
User Name: 乔克
Facebook Url: qiaoke@163.com
User Address: shenzhen
User Name: 华仔
Facebook Url: huazai@163.com
生成xml文件
func Marshal(v interface{}) ([]byte, error)
func MarshalIndent(v interface{}, prefix, indent string) ([]byte, error)
可以使用Marshal()函数和MarshalIndent()函数，之前的json和yaml包里也有用到，区别就是MarshalIndent()可以添加 前缀和缩进，看起来更美观一点，Marshal 和MarshalIndent通过编写一个或多个包含数据的 XML 元素来处理所有其他数据。
package main
import (
"encoding/xml"
"fmt"
"io/ioutil"
)
func main() {
wanger:=User{Address:"beijing",Name:"wanger",Age:24,Social:Social{Email:"wanger@163.com",Mobile:"111111111111"}}
huazi:=User{Address:"shenzhen",Name:"huazai",Age:28,Social:Social{Email:"huazai@163.com",Mobile:"111122211111"}}
qiaoke:=User{Address:"chongqing",Name:"qiaoke",Age:30,Social:Social{Email:"qiaoke@163.com",Mobile:"13332211111"}}
xialaoshi:=User{Address:"chengdu",Name:"夏老师",Age:29,Social:Social{Email:"xialaoshi@163.com",Mobile:"11144445411111"}}
jiangzong:=User{Address:"shanghai",Name:"姜总",Age:25,Social:Social{Email:"jiangzong@163.com",Mobile:"111222445211111"}}
dongdong:=User{Address:"chengdu",Name:"冬哥",Age:30,Social:Social{Email:"dongdong@163.com",Mobile:"1155555211111"}}
zhengge:=User{Address:"beijing",Name:"郑哥",Age:24,Social:Social{Email:"zhengge@163.com",Mobile:"1112224566211111"}}
v:=&Users{Users: []User{wanger,huazi,qiaoke,xialaoshi,zhengge,jiangzong,dongdong}}
result, err := xml.MarshalIndent(v, " ", " ")
if err != nil {
fmt.Printf("error: %v\n", err)
}
fmt.Println(string(result))
fileName := "users.xml"
err = ioutil.WriteFile(fileName, result, 0644)
if err != nil {
panic("Unable to write data into the file")
}
}
type Users struct {
XMLName xml.Name `xml:"users"`
Users []User `xml:"user"`
}
type User struct {
XMLName xml.Name `xml:"user"`
Age int64 `xml:"age"`
Address string `xml:"address,attr"`
Name string `xml:"name"`
Social Social `xml:"social"`
}
type Social struct {
XMLName xml.Name `xml:"social"`
Mobile string `xml:"mobile"`
Email string `xml:"email"`
}
输出信息如下
<users>
<user address="beijing">
<age>24</age>
<name>wanger</name>
<social>
<mobile>111111111111</mobile>
<email>wanger@163.com</email>
</social>
</user>
<user address="shenzhen">
<age>28</age>
<name>huazai</name>
<social>
<mobile>111122211111</mobile>
<email>huazai@163.com</email>
</social>
</user>
<user address="chongqing">
<age>30</age>
<name>qiaoke</name>
<social>
<mobile>13332211111</mobile>
<email>qiaoke@163.com</email>
</social>
</user>
<user address="chengdu">
<age>29</age>
<name>夏老师</name>
<social>
<mobile>11144445411111</mobile>
<email>xialaoshi@163.com</email>
</social>
</user>
<user address="beijing">
<age>24</age>
<name>郑哥</name>
<social>
<mobile>1112224566211111</mobile>
<email>zhengge@163.com</email>
</social>
</user>
<user address="shanghai">
<age>25</age>
<name>姜总</name>
<social>
<mobile>111222445211111</mobile>
<email>jiangzong@163.com</email>
</social>
</user>
<user address="chengdu">
<age>30</age>
<name>冬哥</name>
<social>
<mobile>1155555211111</mobile>
<email>dongdong@163.com</email>
</social>
</user>
</users>
