解析csv文件时出现奇怪的输出

Question

我正在用 golang 解析来自 google api 的 csv 文件，该文件以 utf-16 编码，下面的代码尝试读取一条记录（跳过 header）并打印记录，但它给了我这样的输出，这很奇怪：

, v=/09/20 00:35:42 k=Smartfren Andromax AD681H

估计和utf-16编码有关，具体情况不详，代码如下：主包

import (
    "encoding/csv"
    "io"
    "log"
    "net/http"
    "strings"
)

var url = "http://storage.googleapis.com/play_public/supported_devices.csv"

func main() {

    resp, err := http.Get(url)
    if err != nil {
        return
    }
    defer resp.Body.Close()

    r := csv.NewReader(resp.Body)
    r.LazyQuotes = true
    r.FieldsPerRecord = -1
    // skip header
    r.Read()

    m := make(map[string]string)
    for {
        record, err := r.Read()
        if err == io.EOF {
            break
        }
        if err != nil {
            log.Println(err)
            continue
        }
        if len(record) >= 4 {
            m[strings.TrimSpace(record[3])] = strings.TrimSpace(record[1])
            for k, v := range m {
                log.Printf("k=%s, v=%s\n", k, v)
            }
            break
        }
    }
}

Answer 1

如您所料，输入数据必须从 UTF-16 编码字符流转换为 UTF-8 编码字符流。您可以使用 Go 子存储库包 golang.org/x/text/encoding/unicode:

package main

import (
    "encoding/csv"
    "io"
    "log"
    "net/http"
    "strings"

    "golang.org/x/text/encoding/unicode"
)

var url = "http://storage.googleapis.com/play_public/supported_devices.csv"

func main() {

    resp, err := http.Get(url)
    if err != nil {
        return
    }
    defer resp.Body.Close()

    dec := unicode.UTF16(unicode.LittleEndian, unicode.UseBOM).NewDecoder()
    reader := dec.Reader(resp.Body)

    r := csv.NewReader(reader)
    r.LazyQuotes = true
    r.FieldsPerRecord = -1
    // skip header
    r.Read()

    m := make(map[string]string)
    for {
        record, err := r.Read()
        if err == io.EOF {
            break
        }
        if err != nil {
            log.Println(err)
            continue
        }
        if len(record) >= 4 {
            m[strings.TrimSpace(record[3])] = strings.TrimSpace(record[1])
            for k, v := range m {
                log.Printf("k=%s, v=%s\n", k, v)
            }
            break
        }
    }
}

解析csv文件时出现奇怪的输出

weird output when parsing csv file

csv

encoding

utf-16

go