方法签名
func os.ReadFile(name string) ([]byte, error)
func os.Open(name string) (*File, error)
func io.ReadAll(r Reader) ([]byte, error)
// Deprecated os.ReadFile
func ioutil.ReadFile(filename string) ([]byte, error)
// Deprecated io.ReadAll
func ioutil.ReadAll(r io.Reader) ([]byte, error)
示例1
package main
import (
"fmt"
"os"
)
func main() {
content, err := os.ReadFile("demo.txt")
if err == nil {
// 将[]byte 转为 string后输出
fmt.Println(string(content))
}
}
示例2
package main
import (
"fmt"
"io"
"os"
)
func main() {
file, err := os.Open("demo.txt")
if err == nil {
defer file.Close()
content, err := io.ReadAll(file)
if err == nil {
fmt.Println(string(content))
}
}
}