用Go的xml软件包编组DIDL-Lite

本文介绍了用Go的xml软件包编组DIDL-Lite的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述 以下是一个 DIDL-Lite XML文档示例 UPnP AV ContentDirectory v2服务模板： <？xml version =1.0encoding =UTF-8？ > < DIDL-Lite xmlns：dc =http://purl.org/dc/elements/1.1/ xmlns =urn：schemas-upnp-org：metadata- 1-0 / DIDL-Lite / xmlns：upnp =urn：schemas-upnp-org：metadata-1-0 / upnp / xmlns：xsi =http：// www。 w3.org/2001/XMLSchema-instance xsi：schemaLocation = urn：schemas-upnp-org：metadata-1-0 / DIDL-Lite / http：// www .upnp.org / schemas / av / didl-lite-v2-20060531.xsd urn：schemas-upnp-org：metadata-1-0 / upnp / http：//www.upnp。组织/模式/ AV / UPnP的v2-20061231.xsd> < item id =18parentID =13restricted =0> ... < / item> < / DIDL-Lite> 如何使用编组 http://golang.org/pkg/encoding/xml/rel =nofollow> Go的xml包？更具体地说： 定义名称空间前缀的方式，比如 xmlns：dc 和 xmlns：upnp ？ 如何在元素上配置多个名称空间？是为属性设置的名称空间，例如 schemaLocation 属性中的 xsi 前缀 作为一个基地，我有这样的事情： type DIDLLite struct { XMLName xml.Name`xml：urn：schemas-upnp-org：metadata-1-0 / DIDL-Lite / DIDL-Lite` // ???命名空间前缀dc，upnp，xsi Objects [] Object } I还发现了此可能存在的相关错误。解决方案 您给的例子是。我假设你的意思是要问，如何定义用xml.Marshal编组的Go数据类型到这里？ package $ b $ .name DC string`xml：xmlns：dc，attr` UPNP string`xml：xmlns：upnp，attr` XSI string`xml：xmlns：xsi， attr` XLOC string`xml：xsi：schemaLocation，attr` Objects [] Object`xml：item`} type Object struct { ID字符串`xml：id，attr`父字符串`xml：parentID，attr`受限字符串`xml：restricted，attr` func main（）{d：= DIDLLite { XMLName：xml.Name {空格：urn：schemas-upnp-org：metadata- 1-0 / DIDL-Lite /，本地：DIDL-Lite，}， DC：http://purl.org/dc/elements/1.1/ ， UPNP：urn：schemas-upnp -org：metadata-1-0 / upnp /， XSI：http://www.w3.org/2001/XMLSchema-instance， XLOC：` urn： schema-upnp-org：metadata-1-0 / DIDL-Lite / http://www.upnp.org/schemas/av/didl-lite-v2-20060531.xsd urn：模式-upnp-org：metadata-1-0 / upnp / http：// www.upnp.org/ schemas / av / upnp-v2-20061231.xsd`，对象：[] Object { {ID：18，Parent：13，Restricted：0}}，} b，err：= xml.MarshalIndent（d，，）如果err！= nil { fmt.Println（err） return } fmt.Println（string（b））} $ b $ ; DIDL-Lite xmlns =urn：schemas-upnp-org：metadata-1-0 / DIDL-Lite /xmlns：dc =http://purl.org/dc/elements/1.1/xmlns：upnp = urn：schemas-upnp-org：metadata-1-0 / upnp /xmlns：xsi =http://www.w3.org/2001/XMLSchema-instancexsi：schemaLocation = urn： schemas-upnp-org：metadata-1-0 / DIDL-Lite / http://www.upnp.org/schema s / av / didl-lite-v2-20060531.xsd urn：schemas-upnp-org：metadata-1-0 / upnp / http://www.upnp.org/schemas/av /upnp-v2-20061231.xsd\"> < item id =18parentID =13restricted =0>< / item> < / DIDL-Lite> 可以很漂亮地打印以符合上述示例。 xml.MarshallIndent还有点原始。 Here's a sample DIDL-Lite XML document from the UPnP AV ContentDirectory v2 Service Template:<?xml version="1.0" encoding="UTF-8"?><DIDL-Lite xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/" xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/ http://www.upnp.org/schemas/av/didl-lite-v2-20060531.xsd urn:schemas-upnp-org:metadata-1-0/upnp/ http://www.upnp.org/schemas/av/upnp-v2-20061231.xsd"> <item id="18" parentID="13" restricted="0"> ... </item></DIDL-Lite>How would one go about marshalling to this with Go's xml package? More specifically:How are namespace prefixes defined, such as xmlns:dc and xmlns:upnp?How are multiple name spaces configured on an element?How is the namespace set for attributes, such as the xsi prefix on the schemaLocation attribute?As a base, I have something like this:type DIDLLite struct { XMLName xml.Name `xml:"urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/ DIDL-Lite"` // ??? namespace prefixes dc, upnp, xsi Objects []Object}I've also found this possibly related bug. 解决方案 The example you gave is marshalled. I assume you mean to ask, "how would one define Go data types that marshal with xml.Marshal into this?"package mainimport ( "encoding/xml" "fmt")type DIDLLite struct { XMLName xml.Name DC string `xml:"xmlns:dc,attr"` UPNP string `xml:"xmlns:upnp,attr"` XSI string `xml:"xmlns:xsi,attr"` XLOC string `xml:"xsi:schemaLocation,attr"` Objects []Object `xml:"item"`}type Object struct { ID string `xml:"id,attr"` Parent string `xml:"parentID,attr"` Restricted string `xml:"restricted,attr"`}func main() { d := DIDLLite{ XMLName: xml.Name{ Space: "urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/", Local: "DIDL-Lite", }, DC: "http://purl.org/dc/elements/1.1/", UPNP: "urn:schemas-upnp-org:metadata-1-0/upnp/", XSI: "http://www.w3.org/2001/XMLSchema-instance", XLOC: ` urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/ http://www.upnp.org/schemas/av/didl-lite-v2-20060531.xsd urn:schemas-upnp-org:metadata-1-0/upnp/ http://www.upnp.org/schemas/av/upnp-v2-20061231.xsd`, Objects: []Object{{ID: "18", Parent: "13", Restricted: "0"}}, } b, err := xml.MarshalIndent(d, "", " ") if err != nil { fmt.Println(err) return } fmt.Println(string(b))}Output:<DIDL-Lite xmlns="urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:upnp="urn:schemas-upnp-org:metadata-1-0/upnp/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation=" urn:schemas-upnp-org:metadata-1-0/DIDL-Lite/ http://www.upnp.org/schemas/av/didl-lite-v2-20060531.xsd urn:schemas-upnp-org:metadata-1-0/upnp/ http://www.upnp.org/schemas/av/upnp-v2-20061231.xsd"> <item id="18" parentID="13" restricted="0"></item></DIDL-Lite>which can be pretty printed to match your example above. xml.MarshallIndent is a little primitive yet. 这篇关于用Go的xml软件包编组DIDL-Lite的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！