You can read an entire file into memory using the io/ioutil package.
package main
import (
"io/ioutil"
"log"
)
func main() {
data, err := ioutil.ReadFile("example.txt")
if err != nil {
log.Fatal(err)
}
// Use 'data' as needed
}
2. Read File in Chunks
You can read a file in chunks by limiting the number of bytes to be read at a time. This approach is useful for large files to avoid loading everything into memory at once.
package main
import (
"os"
"log"
)
func main() {
file, err := os.Open("example.txt")
if err != nil {
log.Fatal(err)
}
defer file.Close()
chunkSize := 1024 // Adjust chunk size as needed
buffer := make([]byte, chunkSize)
for {
bytesRead, err := file.Read(buffer)
if err != nil {
if err.Error() == "EOF" {
break // End of file reached
}
log.Fatal(err)
}
// Use 'buffer[:bytesRead]' as needed
}
}
3. Read Line by Line
To read a file line by line, you can use the bufio package.
package main
import (
"bufio"
"os"
"log"
)
func main() {
file, err := os.Open("example.txt")
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
for scanner.Scan() {
line := scanner.Text()
// Process 'line' as needed
}
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
}
