Golang : Save map/struct to JSON or XML file
Previous tutorial on converting map/slice/array to JSON or XML format is for output to web via net/http
package. This tutorial is a slight modification and save the output to JSON or XML file instead.
Here you go!
package main
import (
"encoding/json"
"encoding/xml"
"fmt"
"io"
"os"
"strconv"
)
type Person struct {
Name string `json:"name"`
Age int `json:"age"`
}
func main() {
// create and populate a map from dummy JSON data
dataStr := `{"Name":"Dummy","Age":0}`
personMap := make(map[string]interface{})
err := json.Unmarshal([]byte(dataStr), &personMap)
if err != nil {
panic(err)
}
var onePerson Person
// convert map to Person struct
onePerson.Name = fmt.Sprintf("%s", personMap["Name"])
onePerson.Age, _ = strconv.Atoi(fmt.Sprintf("%v", personMap["Age"]))
jsonData, err := json.Marshal(onePerson)
if err != nil {
panic(err)
}
// sanity check
fmt.Println(string(jsonData))
// write to JSON file
jsonFile, err := os.Create("./Person.json")
if err != nil {
panic(err)
}
defer jsonFile.Close()
jsonFile.Write(jsonData)
jsonFile.Close()
fmt.Println("JSON data written to ", jsonFile.Name())
// write to XML file
xmlFile, err := os.Create("./Person.xml")
if err != nil {
panic(err)
}
defer xmlFile.Close()
xmlWriter := io.Writer(xmlFile)
enc := xml.NewEncoder(xmlWriter)
enc.Indent(" ", " ")
if err := enc.Encode(onePerson); err != nil {
fmt.Printf("error: %v\n", err)
}
xmlFile.Close()
fmt.Println("XML data written to ", xmlFile.Name())
}
Output:
{"name":"Dummy","age":0}
JSON data written to ./Person.json
XML data written to ./Person.xml
References:
https://www.socketloop.com/tutorials/golang-create-new-xml-file
https://www.socketloop.com/tutorials/golang-xml-to-json-example
https://www.socketloop.com/tutorials/golang-covert-map-slice-array-to-json-xml-format
By Adam Ng
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