golang 一行一行读文件
发布时间:2020-12-16 18:15:56 所属栏目:大数据 来源:网络整理
导读:package mainimport ( "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.Fprint
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: %vn",err) continue } countLines(f,counts) f.Close() } } for line,n := range counts { fmt.Printf("%dt%sn",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: %vn",err) continue } for _,line := range strings.Split(string(data),"n") { counts[line]++ } } for line,n := range counts { if n > 1 { fmt.Printf("%dt%sn",line) } } } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |