增加 Go 文件操作.

Signed-off-by: rick.chan <chenyang@autoai.com>
This commit is contained in:
rick.chan 2020-10-13 14:08:29 +08:00
parent b9322b4e66
commit c4de5dbd88
1 changed files with 54 additions and 0 deletions

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# Go 文件操作
## 1.文本文件
### 1.1.创建
```go
f,err := os.Create(fileName)
defer f.Close()
if err !=nil {
fmt.Println(err.Error())
} else {
_,err=f.Write([]byte("要写入的文本内容"))
checkErr(err)
}
```
### 1.2.读取
```go
f, err := os.OpenFile(fileName, os.O_RDONLY,0600)
defer f.Close()
if err !=nil {
fmt.Println(err.Error())
} else {
contentByte,err=ioutil.ReadAll(f)
checkErr(err)
fmt.Println(string(contentByte))
}
```
打开模式如下:
```go
//打开方式
const (
//只读模式
O_RDONLY int = syscall.O_RDONLY // open the file read-only.
//只写模式
O_WRONLY int = syscall.O_WRONLY // open the file write-only.
//可读可写
O_RDWR int = syscall.O_RDWR // open the file read-write.
//追加内容
O_APPEND int = syscall.O_APPEND // append data to the file when writing.
//创建文件,如果文件不存在
O_CREATE int = syscall.O_CREAT // create a new file if none exists.
//与创建文件一同使用,文件必须存在
O_EXCL int = syscall.O_EXCL // used with O_CREATE, file must not exist
//打开一个同步的文件流
O_SYNC int = syscall.O_SYNC // open for synchronous I/O.
//如果可能,打开时缩短文件
O_TRUNC int = syscall.O_TRUNC // if possible, truncate file when opened.
)
```