在Go中写入文件与读取文件的模式类似。首先我们来看一些读取文件的例子。写入文件需要检查大多数调用错误。
所有的示例代码，都放在
F:\worksp\golang目录下。安装Go编程环境请参考：http://www.yiibai.com/go/go_environment.html
writing-files.go的完整代码如下所示 -
package main
import (
"bufio"
"fmt"
"io/ioutil"
"os"
)
func check(e error) {
if e != nil {
panic(e)
}
}
func main() {
// To start, here's how to dump a string (or just
// bytes) into a file.
d1 := []byte("hello\ngo\n")
err := ioutil.WriteFile("dat1.txt", d1, 0644)
check(err)
// For more granular writes, open a file for writing.
f, err := os.Create("dat2.txt")
check(err)
// It's idiomatic to defer a `Close` immediately
// after opening a file.
defer f.Close()
// You can `Write` byte slices as you'd expect.
d2 := []byte{115, 111, 109, 101, 10}
n2, err := f.Write(d2)
check(err)
fmt.Printf("wrote %d bytes\n", n2)
// A `WriteString` is also available.
n3, err := f.WriteString("writes\n")
fmt.Printf("wrote %d bytes\n", n3)
// Issue a `Sync` to flush writes to stable storage.
f.Sync()
// `bufio` provides buffered writers in addition
// to the buffered readers we saw earlier.
w := bufio.NewWriter(f)
n4, err := w.WriteString("buffered\n")
fmt.Printf("wrote %d bytes\n", n4)
// Use `Flush` to ensure all buffered operations have
// been applied to the underlying writer.
w.Flush()
}
执行上面代码，将得到以下输出结果 -
F:\worksp\golang>go run writing-files.go
wrote 5 bytes
wrote 7 bytes
wrote 9 bytes
