Go- 文件读写 -1

package main
import (	"bufio"	"compress/gzip"	"fmt"	"io"	"io/ioutil"	"os"	"path/filepath")
func printDivider(str ...string) {	fmt.Println()	fmt.Println("-----------------------------------------------")	if len(str) > 0 {		fmt.Println(str)	}}
var (	firstName, lastName, s string	i                      int	f                      float32)
func main() {	/*	   读取键盘和标准输入	*/	printDivider("读取键盘和标准输入")	fmt.Println("Please input your full name: ")	//fmt.Scanln(&firstName, &lastName)	//fmt.Printf("Hi %s %s\n", firstName, lastName)
	/*	   读取字符串	   Sscan开头的函数都是从字符串读取	*/	printDivider("读取字符串")	fmt.Sscanf("3.14,100,Hello", "%f,%d,%s", &f, &i, &s)	fmt.Printf("From the string, we read %f, %d, %s\n", f, i, s)
	/*	   利用bufio包从标准输入读取数据	*/	printDivider("利用bufio包提供的缓冲读取来读取数据")	inputReader := bufio.NewReader(os.Stdin) // 创建一个读取器，并且与标准输入绑定	fmt.Println("Please enter your name: ")	input, err := inputReader.ReadString('\n') // 读取到\n结束，返回的input包含\n	if err != nil {		fmt.Println("There were errors reading, error: ", err)		fmt.Println("exiting program.")		return	}
	fmt.Printf("Your name is %s", input)	switch input {	case "Philip\r\n":		fallthrough	case "Chris\r\n":		fallthrough	case "Ivo\r\n":		fmt.Printf("Welcome %s\n", input)	default:		fmt.Printf("You are not welcome here, Goodbye\n")	}
	/*	   利用bufio包读文件	*/	printDivider("利用bufio包读文件")	inputFile, inputError := os.Open("person.go") // 默认以只读方式打开文件，inputFile类型：*os.File	if inputError != nil {		fmt.Printf("An error occurred on opening the inputfile\n" +			"Does the file exist?\n" +			"Have you got access to it?\n")		return	}	defer inputFile.Close()
	inputReader = bufio.NewReader(inputFile) // NewReader函数参数类型：*os.File	for {		inputString, readerError := inputReader.ReadString('\n') // windows和Linux的文件换行符不同，不用关心操作系统类型，直接使用\n就可以		fmt.Printf("The input was: %s", inputString)		if readerError == io.EOF {			break		}	}
	/*	   读取整个文件	*/	printDivider("读取整个文件")	inFile := "person.go"	outFile := "person_copy.go"	buf, err := ioutil.ReadFile(inFile)	if err != nil { // 若文件不存在，运行错误：File Error: open person-.go: The system cannot find the file specified.		fmt.Fprintf(os.Stderr, "File Error: %s\n", err)		//fmt.Fprintf(os.Stderr, "File Error: %s\n", err.Error())	}
	fmt.Printf("%s\n", string(buf))	err = ioutil.WriteFile(outFile, buf, 0644) // err类型是接口类型，调用接口内的函数Error()输出错误信息	if err != nil {		panic(err.Error())	}
	filename := filepath.Base("/path/to/golang/")	fmt.Println(filename) // 输出：golang
	/* 对于各种格式的文件处理，可以从go package中找到对应的包处理，找不到的时候，自己实现处理 */
	/*	   读取压缩文件	   支持压缩文件类型：gzip、flate、bzip2、lzw、zlib	*/	printDivider("读取压缩文件")	fName := "person.gz"	var r *bufio.Reader	fi, err := os.Open(fName)	if err != nil {		fmt.Fprintf(os.Stderr, "%v, Can't open %s, error: %s\n", os.Args[0], fName, err)		os.Exit(1) // 输出：C:\Users\ADMINI~1\AppData\Local\Temp\go-build2880183904\b001\exe\038_Read.exe, Can't open person.zip, error: open person.zip: The system cannot find the file specified.	}
	fz, err := gzip.NewReader(fi)	if err != nil {		r = bufio.NewReader(fi)	} else {		r = bufio.NewReader(fz)	}
	for {		line, err := r.ReadString('\n')		if err != nil {			fmt.Println("Done reading file")			break		}
		fmt.Println(line)	}
	/*	   写文件	*/	printDivider("写文件")	outputFile, outputError := os.OpenFile("output.dat", os.O_WRONLY|os.O_CREATE, 0666)	if outputError != nil {		fmt.Printf("An error occured with file opening or creation\n")		return	}	defer outputFile.Close()
	outputWrite := bufio.NewWriter(outputFile)	outputString := "Hello world\n"
	for i := 0; i < 10; i++ {		outputWrite.WriteString(outputString)	}	outputWrite.Flush()
	outputFile.WriteString(" Hello, GO\n")	fmt.Fprintf(outputFile, "Hello, Fprintf\n")
	/*	   文件拷贝	*/	printDivider("文件拷贝")	srcFile, err := os.Open("person.go")	_, err = io.Copy(outputFile, srcFile) // 追加的方式拷贝	if err != nil {		fmt.Println("io.Copy error: ", err)	}}