golang 一行一行读文件

@H_403_0@package main import ( "bufio" "fmt" "os" ) func main() { counts := make(map[string]int) files := os.Args[1:] if len(files) == 0 { countLines(os.Stdin,counts) } else { for _,arg := range files { f,err := os.Open(arg) if err != nil { fmt.Fprintf(os.Stderr,"dup2: %v\n",err) continue } countLines(f,counts) f.Close() } } for line,n := range counts { fmt.Printf("%d\t%s\n",n,line) } } func countLines(f *os.File,counts map[string]int) { input := bufio.NewScanner(f) for input.Scan() { counts[input.Text()]++ } // NOTE: ignoring potential errors from input.Err() }

go run main.go a.txt

另一种方法：

package main

import (
	"fmt"
	"io/IoUtil"
	"os"
	"strings"
)

func main() {
	counts := make(map[string]int)
	for _,filename := range os.Args[1:] {
		data,err := IoUtil.ReadFile(filename)
		if err != nil {
			fmt.Fprintf(os.Stderr,"dup3: %v\n",err)
			continue
		}
		for _,line := range strings.Split(string(data),"\n") {
			counts[line]++
		}
	}
	for line,n := range counts {
		if n > 1 {
			fmt.Printf("%d\t%s\n",line)
		}
	}
}