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/**
* @Description:使用多种方式将数据写入文件
*/
package main
import (
"os"
"io"
"fmt"
"io/ioutil"
"bufio"
)
func main() {
name := "testwritefile.txt"
content := "Hello, sss.github.io!\n"
WriteWithIoutil(name,content)
contents := "Hello, sss\n"
//清空一次文件并写入两行contents
WriteWithFileWrite(name,contents)
WriteWithIo(name,content)
//使用bufio包需要将数据先读到buffer中，然后在flash到磁盘中
WriteWithBufio(name,contents)
}
//使用ioutil.WriteFile方式写入文件,是将[]byte内容写入文件,如果content字符串中没有换行符的话，默认就不会有换行符
func WriteWithIoutil(name,content string) {
data := []byte(content)
if ioutil.WriteFile(name,data,0644) == nil {
fmt.Println("写入文件成功:",content)
}
}
//使用os.OpenFile()相关函数打开文件对象，并使用文件对象的相关方法进行文件写入操作
//清空一次文件
func WriteWithFileWrite(name,content string){
fileObj,err := os.OpenFile(name,os.O_RDWR|os.O_CREATE|os.O_TRUNC,0644)
if err != nil {
fmt.Println("Failed to open the file",err.Error())
os.Exit(2)
}
defer fileObj.Close()
if _,err := fileObj.WriteString(content);err == nil {
fmt.Println("Successful writing to the file with os.OpenFile and *File.WriteString method.",content)
}
contents := []byte(content)
if _,err := fileObj.Write(contents);err == nil {
fmt.Println("Successful writing to thr file with os.OpenFile and *File.Write method.",content)
}
}
//使用io.WriteString()函数进行数据的写入
func WriteWithIo(name,content string) {
fileObj,err := os.OpenFile(name,os.O_RDWR|os.O_CREATE|os.O_APPEND,0644)
if err != nil {
fmt.Println("Failed to open the file",err.Error())
os.Exit(2)
}
if _,err := io.WriteString(fileObj,content);err == nil {
fmt.Println("Successful appending to the file with os.OpenFile and io.WriteString.",content)
}
}
//使用bufio包中Writer对象的相关方法进行数据的写入
func WriteWithBufio(name,content string) {
if fileObj,err := os.OpenFile(name,os.O_RDWR|os.O_CREATE|os.O_APPEND,0644);err == nil {
defer fileObj.Close()
writeObj := bufio.NewWriterSize(fileObj,4096)
//
if _,err := writeObj.WriteString(content);err == nil {
fmt.Println("Successful appending buffer and flush to file with bufio's Writer obj WriteString method",content)
}
//使用Write方法,需要使用Writer对象的Flush方法将buffer中的数据刷到磁盘
buf := []byte(content)
if _,err := writeObj.Write(buf);err == nil {
fmt.Println("Successful appending to the buffer with os.OpenFile and bufio's Writer obj Write method.",content)
if err := writeObj.Flush(); err != nil {panic(err)}
fmt.Println("Successful flush the buffer data to file ",content)
}
}
}
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