如何将 JSON 对象数组转换为有效的 XML？

穆拉特·科利亚兰

假设我有一个像这样的 JSON 对象数组：

const cars = [
    {
        "color": "purple",
        "type": "minivan",
        "registration": "2020-02-03",
        "capacity": 7
      },
      {
        "color": "orange",
        "type": "SUV",
        "registration": "2021-05-17",
        "capacity": 4
      },
      {
        "color": "green",
        "type": "coupe",
        "registration": "2019-11-13",
        "capacity": 2
      }

];

我想将此对象转换为有效的 XML。但是我在转换时使用开始标记作为数组索引的帮助程序包，因此生成的 XML 无效。

例如：（function json2xml来自gossner）

function json2xml(o, tab) {
    var toXml = function(v, name, ind) {
       var xml = "";
       if (v instanceof Array) {
          for (var i=0, n=v.length; i<n; i++)
             xml += ind + toXml(v[i], name, ind+"\t") + "\n";
       }
       else if (typeof(v) == "object") {
          var hasChild = false;
          xml += ind + "<" + name;
          for (var m in v) {
             if (m.charAt(0) == "@")
                xml += " " + m.substr(1) + "=\"" + v[m].toString() + "\"";
             else
                hasChild = true;
          }
          xml += hasChild ? ">" : "/>";
          if (hasChild) {
             for (var m in v) {
                if (m == "#text")
                   xml += v[m];
                else if (m == "#cdata")
                   xml += "<![CDATA[" + v[m] + "]]>";
                else if (m.charAt(0) != "@")
                   xml += toXml(v[m], m, ind+"\t");
             }
             xml += (xml.charAt(xml.length-1)=="\n"?ind:"") + "</" + name + ">";
          }
       }
       else {
          xml += ind + "<" + name + ">" + v.toString() +  "</" + name + ">";
       }
       return xml;
    }, xml="";
    for (var m in o)
       xml += toXml(o[m], m, "");
    return tab ? xml.replace(/\t/g, tab) : xml.replace(/\t|\n/g, "");
 }
 


const cars = [
{
    "color": "purple",
    "type": "minivan",
    "registration": "2020-02-03",
    "capacity": 7
  },
  {
    "color": "orange",
    "type": "SUV",
    "registration": "2021-05-17",
    "capacity": 4
  },
  {
    "color": "green",
    "type": "coupe",
    "registration": "2019-11-13",
    "capacity": 2
  }

];

console.log(json2xml(cars, ' '));

我尝试了xml2js、fast-xml-parser和jstoxml包。结果是一样的。

编辑：

预期的 XML：

<element> 
    <color>purple</color>
    <type>minivan</type>
    <registration>2020-02-03</registration>
    <capacity>7</capacity>
</element>
<element>
    <color>orange</color>
    <type>SUV</type>
    <registration>2021-05-17</registration>
    <capacity>4</capacity>
</element>
<element>
    <color>green</color>
    <type>coupe</type>
    <registration>2019-11-13</registration>
    <capacity>2</capacity>
</element>

约翰

这个怎么样？

这假设 JSON 对象数组都具有相同的键。

let xml = "";

const prefixXML = `<?xml version="1.0" encoding="UTF-8"?>\n<cars>\n`;
const suffixXML = "\n</cars>";

const keys = Object.keys(cars[0]);

cars.forEach((car) => {
  let valueXML = keys
    .map((key) => {
      return `<${key}>${car[key]}</${key}>`;
    })
    .join("\n\t");
  xml += `
    <car>
      ${valueXML}
    </car>
  `;
});

const final = prefixXML + xml + suffixXML;

console.log(final);

XML 输出是：

<?xml version="1.0" encoding="UTF-8"?>
<cars>

    <car>
        <color>purple</color>   
    <type>minivan</type>    
    <registration>2020-02-03</registration> 
    <capacity>7</capacity>  
    </car>
  
    <car>
        <color>orange</color>   
    <type>SUV</type>    
    <registration>2021-05-17</registration> 
    <capacity>4</capacity>  
    </car>
  
    <car>
        <color>green</color>    
    <type>coupe</type>  
    <registration>2019-11-13</registration> 
    <capacity>2</capacity>  
    </car>
  
</cars>

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