go标准库学习之bufio

使用Scanner扫描文件

package main

import (
	"fmt"
	"bufio"
	"os"
)

func main() {
	file, err := os.Open("./data.txt")	//打开文件
	if err != nil {
		fmt.Println(err)
		return
	}
	defer file.Close()					//关闭文件

	scanner := bufio.NewScanner(file)	//生成文件scanner

	for scanner.Scan() {				//逐行扫描
		fmt.Println(scanner.Text())		//返回行的文本
	}

	if err := scanner.Err(); err != nil {
		fmt.Fprintln(os.Stderr, "reading standard input:", err)
	}

}

使用scanner统计单词数量

package main

import (
	"fmt"
	"bufio"
	"os"
	"strings"
)

func main() {
	const input = "Now is the winter of our discontent,\nMade glorious summer by this sun of York.\n"
	scanner := bufio.NewScanner(strings.NewReader(input))

	scanner.Split(bufio.ScanWords)          //分割

	count := 0

	for scanner.Scan() {
		count++
		fmt.Println(scanner.Text())
	}

	if err := scanner.Err(); err != nil {
		fmt.Fprintln(os.Stderr, "reading input:", err)
	}

	fmt.Printf("%d \n", count)
}