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                # Go 寫入文件 Go將數據寫入文件的方法和上面介紹過的讀取文件的方法很類似。 ```go package main import ( "bufio" "fmt" "io/ioutil" "os" ) func check(e error) { if e != nil { panic(e) } } func main() { // 首先看一下如何將一個字符串寫入文件 d1 := []byte("hello\ngo\n") err := ioutil.WriteFile("/tmp/dat1", d1, 0644) check(err) // 為了實現細顆粒度的寫入,打開文件后再寫入 f, err := os.Create("/tmp/dat2") check(err) // 在打開文件后通常應該立刻使用defer來調用 // 打開文件的Close方法,以保證main函數結束 // 后,文件關閉 defer f.Close() // 你可以寫入字節切片 d2 := []byte{115, 111, 109, 101, 10} n2, err := f.Write(d2) check(err) fmt.Printf("wrote %d bytes\n", n2) // 也可以使用`WriteString`直接寫入字符串 n3, err := f.WriteString("writes\n") fmt.Printf("wrote %d bytes\n", n3) // 調用Sync方法來將緩沖區數據寫入磁盤 f.Sync() // `bufio`除了提供上面的緩沖讀取數據外,還 // 提供了緩沖寫入數據的方法 w := bufio.NewWriter(f) n4, err := w.WriteString("buffered\n") fmt.Printf("wrote %d bytes\n", n4) // 使用Flush方法確保所有緩沖區的數據寫入底層writer w.Flush() } ``` 運行結果 ``` wrote 5 bytes wrote 7 bytes wrote 9 bytes ```
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