golang 解析rss并返回json？

Question

<rss>
    <channel>
    <title>RSS</title>
    <item>
        <title>23333</title>
        <my:size>7.8 MiB</my:size>
    </item>
    </channel>
</rss>

type RSS struct {
    Channel Channel `xml:"channel"`
}

type Channel struct {
    Title       string `xml:"title"`
    Items       []Item `xml:"item"`
}

type Item struct {
    Title string `xml:"title"`
    Size  string `xml:"my:size"`
}

func rss(w http.ResponseWriter, r *http.Request) {
    var rss RSS
    err = xml.Unmarshal([]byte(rss_str), &rss)
    if err != nil {
        fmt.Printf("解析 XML 失败: %s\n", err)
        return
    }
    jsonData, err := json.MarshalIndent(rss, "", "  ")
    if err != nil {
        fmt.Printf("转换为 JSON 失败: %s\n", err)
        return
    }

    w.Write(jsonData)
}

就这个 my:size 很难办，我无法正确解析，得到的内容为空

目前我是用

rss_str := strings.ReplaceAll(rss_str, "my:", "")

凑活的，能满足我要求，但总感觉不是个事儿。

请问，该怎么解析带命名空间的xml？
谢谢

Answer 1

go代码

package main

import (
    "encoding/json"
    "encoding/xml"
    "fmt"
    "strings"
)

type RSS struct {
    Channel Channel `xml:"channel"`
}

type Channel struct {
    Title string `xml:"title"`
    Items []Item `xml:"item"`
}

type Item struct {
    Title string `xml:"title"`
    Size  string `xml:"size"`
}

func main() {
    rssStr := `<rss>
    <channel>
        <title>RSS</title>
        <item>
            <title>23333</title>
            <my:size xmlns:my="http://example.com/my">7.8 MiB</my:size>
        </item>
    </channel>
</rss>`

    var rss RSS
    decoder := xml.NewDecoder(strings.NewReader(rssStr))
    var currentElement string

    for {
        token, err := decoder.Token()
        if err != nil {
            break
        }
        switch element := token.(type) {
        case xml.StartElement:
            currentElement = element.Name.Local
            if element.Name.Space == "http://example.com/my" && currentElement == "size" {
                var size string
                decoder.DecodeElement(&size, &element)
                rss.Channel.Items = append(rss.Channel.Items, Item{Size: size})
            }
        case xml.EndElement:
            currentElement = ""
        case xml.CharData:
            if currentElement == "title" {
                rss.Channel.Items = append(rss.Channel.Items, Item{Title: string(element)})
            }
        }
    }

    jsonData, err := json.MarshalIndent(rss, "", "  ")
    if err != nil {
        fmt.Printf("转换为 JSON 失败: %s\n", err)
        return
    }

    fmt.Println(string(jsonData))
}

输出JSON

{
  "Channel": {
    "Title": "",
    "Items": [
      {
        "Title": "23333",
        "Size": "7.8 MiB"
      }
    ]
  }
}