go语言csv文件的读取

暂时未整理

package mainimport (    "encoding/csv"    "fmt"    "io"    "log"    "os")func main() {    //准备读取文件    fileName := "D:\\gotest\\src\\source\\test.csv"    fs, err := os.Open(fileName)    if err != nil {        log.Fatalf("can not open the file, err is %+v", err)    }    defer fs.Close()    r := csv.NewReader(fs)    //针对大文件，一行一行的读取文件    for {        row, err := r.Read()        if err != nil && err != io.EOF {            log.Fatalf("can not read, err is %+v", err)        }        if err == io.EOF {            break        }        fmt.Println(row)    }    //针对小文件，也可以一次性读取所有的文件    //注意，r要重新赋值，因为readall是读取剩下的    fs1, _ := os.Open(fileName)    r1 := csv.NewReader(fs1)    content, err := r1.ReadAll()    if err != nil {        log.Fatalf("can not readall, err is %+v", err)    }    for _, row := range content {        fmt.Println(row)    }    //创建一个新文件    newFileName := "D:\\gotest\\src\\source\\newfile.csv"    //这样打开，每次都会清空文件内容    //nfs, err := os.Create(newFileName)    //这样可以追加写    nfs, err := os.OpenFile(newFileName, os.O_RDWR|os.O_CREATE, 0666)    if err != nil {        log.Fatalf("can not create file, err is %+v", err)    }    defer nfs.Close()    nfs.Seek(0, io.SeekEnd)    w := csv.NewWriter(nfs)    //设置属性    w.Comma = ','    w.UseCRLF = true    row := []string{"1", "2", "3", "4", "5,6"}    err = w.Write(row)    if err != nil {        log.Fatalf("can not write, err is %+v", err)    }    //这里必须刷新，才能将数据写入文件。    w.Flush()    //一次写入多行    var newContent [][]string    newContent = append(newContent, []string{"1", "2", "3", "4", "5", "6"})    newContent = append(newContent, []string{"11", "12", "13", "14", "15", "16"})    newContent = append(newContent, []string{"21", "22", "23", "24", "25", "26"})    w.WriteAll(newContent)}