使用Golang解析Yaml、Json、Xml文件
我是陈晓 · 330浏览 · 发布于2021-09-30
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)。
解析和生成yaml文件
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
golang
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