读取文件中的内容
假设你想获取文件中感兴趣的内容,但是,你不希望获取所有内容。假设文件的内容如下所示:
1. 网页视觉设计理论之少些质感,多些版式.
http://www.ynetx.com/theory/560-1.html
2. 设计理论:
http://www.ynetx.com/design/theory/
3.Google的新设计理念Material Design
http://www.infoq.com/cn/news/2014/07/google-material-design-android/
你只想获取http开头的行内容。实现代码如下:
line, err := reader.ReadString('\n')
// skip all line starting without line 'http'
// if equal := strings.Index(line, "http"); equal < 0 {
// fmt.Print(line)
// }
//alternatively, only print line starting with 'http'
if equal := strings.Index(line, "http"); equal >= 0 {
fmt.Print(line)
}
完整代码如下所示:
package main
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"strings"
"unicode"
)
func ReadFile(filePath string) {
file, err := os.Open(filePath)
if err != nil {
fmt.Println(err)
return
}
defer file.Close()
reader := bufio.NewReader(file)
for {
line, err := reader.ReadString('\n')
// skip all line starting without line 'http'
// if equal := strings.Index(line, "http"); equal < 0 {
// fmt.Print(line)
// }
//alternatively, only print line starting with 'http'
if equal := strings.Index(line, "http"); equal >= 0 {
fmt.Print(line)
}
if err == io.EOF {
break
}
if err != nil {
fmt.Println(err)
}
}
}
func main(){
//文件路径../util/art.txt
ReadFile("../util/art.txt")
}
输出结果:
http://www.ynetx.com/theory/560-1.html
http://www.ynetx.com/design/theory/
http://www.infoq.com/cn/news/2014/07/google-material-design-android/
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