golang读取文件

golang读文件

1、os.Open()

//File文件读操作
func ReadFile() string {
    file, err := os.Open("./test.txt")
    if err != nil {
        fmt.Printf("err:%v\n", err)
    }
    defer file.Close()

    var chunk []byte
    buf := make([]byte, 100)

    for {
        count, err := file.Read(buf)
        if err != nil && err != io.EOF {
            fmt.Println("read buf fail", err)
            return ""
        }

        if count == 0 {
            break
        }
        chunk = append(chunk, buf[:count]...)
    }
    return string(chunk)
}

2、ioutil.ReadFile

func ReadFile2() {
    b, _ := ioutil.ReadFile("./test.txt")
    fmt.Printf("string(b): %v\n", string(b))
}

3、ioutil.ReadAll

func ReadFile3() {
    f, _ := os.Open("./test.txt") // File实现了Reader
    defer f.Close()

    b, err := ioutil.ReadAll(f)

    if err != nil {
        fmt.Printf("err: %v\n", err)
    }

    fmt.Printf("string(b): %v\n", string(b))
}

 

标签：ioutil,文件,读取,err,fmt,golang,buf,chunk,string
来源： https://www.cnblogs.com/wushaoyu/p/16534041.html