bufio 包提供的缓冲读取（buffered reader）来读取数据

package main
import (
    "bufio"
    "fmt"
    "os"
)
var inputReader *bufio.Reader
func main() {
    inputReader = bufio.NewReader(os.Stdin)
    fmt.Println("please enter some input:")
    input, err := inputReader.ReadString('\n')
    if err == nil {
        fmt.Printf("The input was: %s\n", input)
    }
}
> go run main.go
please enter some input:
1111
The input was: 1111

读取文件

package main
import (
    "bufio"
    "fmt"
    "io"
    "os"
)
func main() {
    inputFile, inputError := os.Open("nginx.conf")
    if inputError != nil {
        fmt.Println("An error occurred on opening the inputfile", inputError)
        return
    }
    defer inputFile.Close()
    inputReader := bufio.NewReader(inputFile)
    for {
        inputString, readerError := inputReader.ReadString('\n')
        fmt.Printf(inputString)
        if readerError == io.EOF {
            return
        }
    }
}

写入文件

package main
import (
    "bufio"
    "fmt"
    "os"
)
func main() {
    outputFile, outputError := os.OpenFile("output.dat", os.O_WRONLY|os.O_CREATE, 0666)
    if outputError != nil {
        fmt.Printf("An error occurred with file opening or creating or creation \n")
        return
    }
    defer outputFile.Close()
    outputWriter := bufio.NewWriter(outputFile)
    outputString := "hello world!!\n"
    for i := 0; i < 10; i++ {
        outputWriter.WriteString(outputString)
    }
    outputWriter.Flush()
}