current position:Home>[golang] go into go language lesson 22 JSON & file reading and writing
[golang] go into go language lesson 22 JSON & file reading and writing
2021-08-25 18:49:43 【I'm Xiaobai】
【Golang】️ Walk into Go Language ️ Lesson 22 json & File read and write
summary
Golang Is a new cross platform programming language . Today, Xiaobai will take you hand in hand into Golang The world of . ( The first 22 course )
json
json (JavaScript Object Notation) Is a lightweight data exchange format .
code
Format :
json.Marshal(v interface{})
Example :
package main
import (
"encoding/json"
"fmt"
)
func main() {
type person struct {
Name string
Job string
}
Bob := person{
"Bob",
" Excrement extractor ",
}
// code
b, error := json.Marshal(Bob)
if error != nil {
fmt.Println(error)
}
// Debug output
fmt.Println(b)
fmt.Println(string(b))
}
Output results :
[123 34 78 97 109 101 34 58 34 66 111 98 34 44 34 74 111 98 34 58 34 230 142 143 231 178 170 229 183 165 34 125]
{"Name":"Bob","Job":" Excrement extractor "}
decode
package main
import (
"encoding/json"
"fmt"
)
func main() {
type person struct {
Name string
Job string
}
// convert to json
var jsonbytes = []byte(`{"Name": "bob","Job": "dancer"}`)
fmt.Println(jsonbytes)
// Defining variables p
var p person
// decode
error := json.Unmarshal(jsonbytes, &p)
if error != nil {
fmt.Println(error)
}
// Debug output
fmt.Printf("%+v", p)
}
Output results :
[123 34 78 97 109 101 34 58 32 34 98 111 98 34 44 34 74 111 98 34 58 32 34 100 97 110 99 101 114 34 125]
{Name:bob Job:dancer}
File read and write
File reading and writing is a common operation . Go Language provides support for a variety of text operations .
File read
Format :
ReadAll(r io.Reader) ([]byte, error)
Read the entire file :
package main
import (
"fmt"
"io/ioutil"
"os"
)
func main() {
// Open file
file, err := os.Open("C:/Users/Windows/Desktop/project2/read_write/read/1.txt")
fmt.Println(file, err)
// Delay off
defer file.Close()
// Read entire file
read_bytes, err := ioutil.ReadAll(file)
// Debug output
fmt.Println(string(read_bytes))
}
Output results :
&{0xc0000da780} <nil>
A
B
C
D
Read file by byte (panic Used to throw an error ):
package main
import (
"fmt"
"io"
"os"
)
func main() {
// Open file
file, err := os.Open("C:/Users/Windows/Desktop/project2/read_write/read/1.txt")
if err != nil {
panic(err)
}
// Delay off
defer file.Close()
// establish byte Arrays are used to hold data
result := make([]byte, 0)
// Create buffer
buffer := make([]byte, 1024)
for {
// Read 1kb
n, err := file.Read(buffer)
// Error handling
if err != nil && err != io.EOF {
panic(err)
}
// Out of the loop
if 0 == n {
break
}
// append ( add ... You can append an array , Otherwise, you can only append elements )
result = append(result, buffer[:n]...)
}
// Debug output final result
fmt.Println(string(result))
}
write file
Format :
file.Write(f *File) Write(b []byte)
Return value :
- nums: Number of bytes written
- err: error
Example :
package main
import (
"fmt"
"os"
)
func main() {
// Define string , And convert it into a byte array
input := []byte("Hello World")
// Wear a file
file, err := os.Create("1.txt")
if err != nil {
panic(err)
}
// Delay off
defer file.Close()
// write file
nums, err := file.Write(input)
if err != nil {
panic(err)
}
// Number of bytes written to debug output
fmt.Println(" Number of bytes :", nums)
}
Output results :
Number of bytes : 11
copyright notice
author[I'm Xiaobai],Please bring the original link to reprint, thank you.
https://en.qdmana.com/2021/08/20210825184941016p.html
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