1 package main
2
3 import (
4 "fmt"
5 "log"
6 "os"
7 )
8
9 func HandleErr(err error) {
10 if err != nil {
11 log.Fatal(err)
12 }
13 }
14
15 func main() {
16 /*
17 写入数据：
18 */
19
20 fileName := "D:\\Go\\web2\\aa.txt"
21 file, err := os.OpenFile(fileName, os.O_CREATE|os.O_WRONLY|os.O_APPEND, os.ModePerm)
22 HandleErr(err)
23 defer file.Close()
24
25 // 写入数据
26 bs := []byte{97, 98, 99, 100} //a,b,c,d
27 n, err := file.Write(bs[:2]) // n,err := file.Write(bs)
28 fmt.Println(n) // 2
29 HandleErr(err)
30 file.WriteString("\n")
31
32 // 直接写入字符串
33 n, err = file.WriteString("HelloWorld")
34 fmt.Println(n) // 10
35 HandleErr(err)
36
37 file.WriteString("\n")
38 n, err = file.Write([]byte("today"))
39 fmt.Println(n) // 5
40 HandleErr(err)
41
42 }
