Read a XML file in Go
Golang has a very powerful encoding/xml
package that comes with the standard library. All you need to do is the create the data structures to map according to XML document.
In this tutorial we will learn how to read this XML document with the xml.Unmarshal()
function
Employee.xml
<?xml version="1.0"?>
<company>
<staff>
<id>101</id>
<firstname>Derek</firstname>
<lastname>Young</lastname>
<username>derekyoung</username>
</staff>
<staff>
<id>102</id>
<firstname>John</firstname>
<lastname>Smith</lastname>
<username>johnsmith</username>
</staff>
</company>
and map to these data structs and print out the values
type Staff struct {
XMLName xml.Name `xml:"staff"`
ID int `xml:"id"`
FirstName string `xml:"firstname"`
LastName string `xml:"lastname"`
UserName string `xml:"username"`
}
type Company struct {
XMLName xml.Name `xml:"company"`
Staffs []Staff `xml:"staff"`
}
In real life, a company has many staffs. Therefore, we map Company.Staffs to Staff struct.
With the data structures defined. We are going to use the xml.Unmarshal()
function to load the XML data into the Company structure.
var c Company
xml.Unmarshal(XMLdata, &c)
Below is the full code of reading the XML file Employees.xml
package main
import (
"fmt"
"io/ioutil"
"os"
"encoding/xml"
)
type Staff struct {
XMLName xml.Name `xml:"staff"`
ID int `xml:"id"`
FirstName string `xml:"firstname"`
LastName string `xml:"lastname"`
UserName string `xml:"username"`
}
type Company struct {
XMLName xml.Name `xml:"company"`
Staffs []Staff `xml:"staff"`
}
func (s Staff) String() string {
return fmt.Sprintf("\t ID : %d - FirstName : %s - LastName : %s - UserName : %s \n", s.ID, s.FirstName , s.LastName, s.UserName)
}
func main() {
xmlFile, err := os.Open("Employees.xml")
if err != nil {
fmt.Println("Error opening file:", err)
return
}
defer xmlFile.Close()
XMLdata, _ := ioutil.ReadAll(xmlFile)
var c Company
xml.Unmarshal(XMLdata, &c)
fmt.Println(c.Staffs)
}
and the output after parsing.
go run parseEmployee.go
ID : 101 - FirstName : Derek - LastName : Young - UserName : derekyoung
ID : 102 - FirstName : John - LastName : Smith - UserName : johnsmith
Hope this tutorial is helpful enough to you. Please leave your comment below if you have any question.
See also : Golang : How to read CSV file
By Adam Ng
IF you gain some knowledge or the information here solved your programming problem. Please consider donating to the less fortunate or some charities that you like. Apart from donation, planting trees, volunteering or reducing your carbon footprint will be great too.
Advertisement
Tutorials
+7.8k Javascript : How to check a browser's Do Not Track status?
+21.9k Fix "Failed to start php5-fpm.service: Unit php5-fpm.service is masked."
+10.1k Golang : Text file editor (accept input from screen and save to file)
+8.9k Golang : automatically figure out array length(size) with three dots
+6.1k PHP : How to handle URI or URL with non-ASCII characters such as Chinese/Japanese/Korean(CJK) ?
+26.3k Golang : Get executable name behind process ID example
+30.5k Golang : Remove characters from string example
+6.1k Linux/Unix : Commands that you need to be careful about
+18.3k Golang : Logging with logrus
+29.3k Golang : How to create new XML file ?
+17.3k Golang : Get future or past hours, minutes or seconds
+19.1k Golang : Calculate entire request body length during run time