我正在寻找每个对象从JSON objects到XML single row的转换。现在，我能够转换为XML，但这不是我想要的。有人可以帮助我吗？另外，我不需要一些字段。以下是JSON and preferred XML structure。
JSON示例
{
"paging": {
"limit": 100,
"total": 1394,
"next": "Mg=="
},
"data": [
{
"mmsi": 538006090,
"imo": 9700665,
"last_known_position": {
"timestamp": "2017-12-18T20:24:27+00:00",
"geometry": {
"type": "Point",
"coordinates": [
60.87363,
-13.02203
]
}
}
},
{
"mmsi": 527555481,
"imo": 970000,
"last_known_position": {
"timestamp": "2017-12-18T20:24:27+00:00",
"geometry": {
"type": "Point",
"coordinates": [
4.57883,
3.76899
]
}
}
}
]
}
我想要的XML
<vessel>
<row mmsi="538006090" imo="9700665" lat="60.87363" lon="-13.02203"/>
<row mmsi="527555481" imo="970000" lat="4.57883" lon="3.76899"/>
</vessel>
谢谢
答案 0 :(得分：0)
标准的JSON-to-XML转换库永远不会为您提供所需的XML;您几乎总是希望使用XSLT对XML进行转换。
另一种方法是从原始JSON手工构造您想要的XML。
这两种方法都可以使用XSLT 3.0，我将其用于说明目的，但您可以使用与其他语言相同的设计方法。
（a）如果使用XSLT 3.0进行标准的json-to-xml转换，它将为您提供如下的XML结构：
<?xml version="1.0" encoding="UTF-8"?>
<map xmlns="http://www.w3.org/2005/xpath-functions">
<map key="paging">
<number key="limit">100</number>
<number key="total">1394</number>
<string key="next">Mg==</string>
</map>
<array key="data">
<map>
<number key="mmsi">538006090</number>
<number key="imo">9700665</number>
<map key="last_known_position">
<string key="timestamp">2017-12-18T20:24:27+00:00</string>
<map key="geometry">
<string key="type">Point</string>
<array key="coordinates">
<number>60.87363</number>
<number>-13.02203</number>
</array>
</map>
</map>
</map>
<map>
<number key="mmsi">527555481</number>
<number key="imo">970000</number>
<map key="last_known_position">
<string key="timestamp">2017-12-18T20:24:27+00:00</string>
<map key="geometry">
<string key="type">Point</string>
<array key="coordinates">
<number>4.57883</number>
<number>3.76899</number>
</array>
</map>
</map>
</map>
</array>
</map>
然后您可以使用以下方法将其转换为所需的输出：
<xsl:template name="postprocess" xpath-default-namespace=""http://www.w3.org/2005/xpath-functions">
<vessel>
<xsl:for-each select=".//map[number[@key='mmsi']]">
<row mmsi="{*[@key='mmsi']}"
imo="*[@key='imo']"
lat="{.//*[@key='coordinates']/number[1]}"
lon="{.//*[@key='coordinates']/number[1]}"/>
</xsl:for-each>
</vessel>
</xsl:template>
（b）或者，也许在这种情况下更容易，您可以选择所需的JSON部分并直接构建XML：
<xsl:transform xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
exclude-result-prefixes="#all"
version="3.0">
<xsl:template name="xsl:initial-template">
<vessel>
<xsl:for-each select="json-doc('test.json')?data?*">
<xsl:variable name="coords" select="?last_known_position?geometry?coordinates"/>
<row mmsi="{xs:integer(?mmsi)}" imo="{xs:integer(?imo)}" lat="{$coords?1}" lon="{$coords?2}"/>
</xsl:for-each>
</vessel>
</xsl:template>
</xsl:transform>
答案 1 :(得分：0)
使用Cinchoo ETL - 一个开源库，您可以使用几行代码轻松完成转换
string json = @"{
""paging"": {
""limit"": 100,
""total"": 1394,
""next"": ""Mg==""
},
""data"": [
{
""mmsi"": 538006090,
""imo"": 9700665,
""last_known_position"": {
""timestamp"": ""2017-12-18T20:24:27+00:00"",
""geometry"": {
""type"": ""Point"",
""coordinates"": [
60.87363,
-13.02203
]
}
}
},
{
""mmsi"": 527555481,
""imo"": 970000,
""last_known_position"": {
""timestamp"": ""2017-12-18T20:24:27+00:00"",
""geometry"": {
""type"": ""Point"",
""coordinates"": [
4.57883,
3.76899
]
}
}
}
]
}
";
StringBuilder sb = new StringBuilder();
using (var p = ChoJSONReader.LoadText(json)
.WithJSONPath("$..data")
)
{
using (var w = new ChoXmlWriter(sb)
.Configure(c => c.RootName = "vessel")
.Configure(c => c.NodeName = "row")
)
{
w.Write(p.Select(r => new { _mmsi = r.mmsi, _imo = r.imo, _lat = r.last_known_position.geometry.coordinates[0], _lon = r.last_known_position.geometry.coordinates[1] }));
}
}
Console.WriteLine(sb.ToString());
输出：
<vessel>
<row mmsi="538006090" imo="9700665" lat="60.87363" lon="-13.02203" />
<row mmsi="527555481" imo="970000" lat="4.57883" lon="3.76899" />
</vessel>
Checkout CodeProject文章提供了一些额外的帮助。
<强>更新
要处理特殊的空值条件，可以按如下所示编写
string json = @"{
""paging"": {
""limit"": 100,
""total"": 1394,
""next"": ""Mg==""
},
""data"": [
{
""mmsi"": 538006090,
""imo"": 9700665,
""last_known_position"": {
""timestamp"": ""2017-12-18T20:24:27+00:00"",
""geometry"": {
""type"": ""Point"",
""coordinates"": [
60.87363,
-13.02203
]
}
}
},
{
""mmsi"": 527555481,
""imo"": null,
""last_known_position"": {
""timestamp"": ""2017-12-18T20:24:27+00:00"",
""geometry"": {
""type"": ""Point"",
""coordinates"": [
4.57883,
3.76899
]
}
}
}
]
}
";
StringBuilder sb = new StringBuilder();
using (var p = ChoJSONReader.LoadText(json)
.WithJSONPath("$..data")
)
{
using (var w = new ChoXmlWriter(sb)
.Configure(c => c.RootName = "vessel")
.Configure(c => c.NodeName = "row")
)
{
w.Write(p.Select(r => new { _mmsi = r.mmsi, _imo = r.imo == null ? "null" : r.imo, _lat = r.last_known_position.geometry.coordinates[0], _lon = r.last_known_position.geometry.coordinates[1] }));
}
}
Console.WriteLine(sb.ToString());
输出：
<vessel>
<row mmsi="538006090" imo="9700665" lat="60.87363" lon="-13.02203" />
<row mmsi="527555481" imo="null" lat="4.57883" lon="3.76899" />
</vessel>
免责声明：我是这个图书馆的作者。