153 lines
2.8 KiB
Markdown
153 lines
2.8 KiB
Markdown
# Go 文件操作
|
||
|
||
os.File 封装了所有文件相关的操作，File 是一个结构体，有很多方法。
|
||
|
||
## 1.os 包
|
||
|
||
### 1.1.创建文件
|
||
|
||
```go
|
||
func Create(name string) (file *File, err error)
|
||
func NewFile(fd uintptr, name string) *File
|
||
```
|
||
|
||
Create 方法示例如下：
|
||
|
||
```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.打开文件
|
||
|
||
```go
|
||
func Open(name string) (*File, error)
|
||
func OpenFile(name string, flag int, perm FileMode) (*File, error)
|
||
```
|
||
|
||
perm 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.
|
||
)
|
||
```
|
||
|
||
### 1.3.获取文件状态
|
||
|
||
```go
|
||
func (f *File) Stat() (fi FileInfo, err error)
|
||
```
|
||
|
||
### 1.4.读取文件
|
||
|
||
```go
|
||
func (f *File) Read(b []byte) (n int, err error)
|
||
```
|
||
|
||
### 1.5.写入文件
|
||
|
||
```go
|
||
func (f *File) Write(b []byte) (n int, err error)
|
||
```
|
||
|
||
### 1.6.设置读写位置
|
||
|
||
```go
|
||
/**
|
||
* @param whence
|
||
* os.SEEK_SET: seek relative to the origin of the file
|
||
* os.SEEK_CUR: seek relative to the current offset
|
||
* os.SEEK_END: seek relative to the end
|
||
*/
|
||
func (f *File) Seek(offset int64, whence int) (ret int64, err error)
|
||
```
|
||
|
||
## 2.ioutil 包
|
||
|
||
### 2.1.读取
|
||
|
||
示例如下：
|
||
|
||
```go
|
||
package main
|
||
|
||
import(
|
||
"io/ioutil"
|
||
"fmt"
|
||
)
|
||
|
||
func main(){
|
||
b,err := ioutil.ReadFile("C:/example.txt")
|
||
|
||
if err != nil{
|
||
fmt.Println(err)
|
||
}
|
||
|
||
fmt.Println(b)
|
||
fmt.Println(string(b))
|
||
}
|
||
```
|
||
|
||
### 2.2.写入
|
||
|
||
示例如下：
|
||
|
||
```go
|
||
package main
|
||
|
||
import(
|
||
"io/ioutil"
|
||
"fmt"
|
||
)
|
||
|
||
func main(){
|
||
str := []byte("Hello,Go!")
|
||
err := ioutil.WriteFile("C:/example.txt", str, 0644)
|
||
if err != nil{
|
||
panic(err)
|
||
}else{
|
||
fmt.Println("WriteFile Success!")
|
||
}
|
||
}
|
||
```
|
||
|
||
## 3.bufio 包
|
||
|
||
### 3.1.读文件
|
||
|
||
```go
|
||
func NewReader(rd io.Reader) *Reader
|
||
func (b *Reader) Read(p []byte) (n int, err error)
|
||
func (b *Reader) ReadLine() (line []byte, isPrefix bool, err error)
|
||
```
|
||
|
||
### 3.2.写文件
|
||
|
||
```go
|
||
func NewWriter(w io.Writer) *Writer
|
||
func (b *Writer) Write(p []byte) (nn int, err error)
|
||
```
|