英文:
Cannot extract correct data from XML in GO
问题
type Artist struct {
Name string xml:"name"
Gender string xml:"gender"
Country string xml:"country"
}
英文:
I am retrieving some XML from the web, but I am having problem extracting the data that I need. This is the XML:
<metadata xmlns="http://musicbrainz.org/ns/mmd-2.0#" xmlns:ext="http://musicbrainz.org/ns/ext#-2.0" created="2013-04-13T16:54:01.107Z"><artist-list count="2" offset="0"><artist id="35dac7d2-0b1f-470f-9a5a-c53c8821f6d6" type="Person" ext:score="100"><name>Eric Prydz</name><sort-name>Prydz, Eric</sort-name><gender>male</gender><country>SE</country></artist></artist-list></metadata>
I want to extract the name, gender and country. This is the code:
package mainimport ("encoding/xml""fmt""io/ioutil""net/http")func main() {client := &http.Client{}req, _ := http.NewRequest("GET", "http://www.musicbrainz.org/ws/2/artist/?query=artist:Fred", nil)res, _ := client.Do(req)bs, _ := ioutil.ReadAll(res.Body)var artist Artistxml.Unmarshal(bs, &artist)fmt.Printf("%#v\n", artist)}type Artist struct {Name string `xml: "name"`Gender string `xml: "gender"`Country string `xml: "country"`}
But everytime I run this I always get this:
main.Artist{Name:"", Gender:"", Country:""}
Can someone point where the problem is ?
Thanks.
答案1
得分: 4
好的，问题是，你没有充分描述xml的数据以进行解组。你的数据看起来更像是：
struct metadata {// 你需要给它加上标签，因为Go的字段名不能包含-符号artists []Artist "artist-list"}
这样应该可以工作。基本上，Unmarshal只会查看顶级节点，而不会向下查找结构。
英文:
Okay, the problem is, you haven't adequately described the data for xml to unmarshal. Your data looks more like
struct metadata {// you need to tag it because go field names can't contain -'sartists []Artist "artist-list"}
Something like that should work. Basically, Unmarshal is only going to look at the top-level nodes, not walk down looking for a structure.
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