Java Dom集合元素错误

我正在使用Dom创建xml文件，但我无法编写标记 属性如下

<m:FC_TargetPath="SyndicationUpdated" m:FC_KeepInContent="false" rt:filterable="false">

例外是

---

要设置命名空间中的属性，您需要使用

setAttributeNS

而不是

setAttribute

，并将相应的命名空间URI传递给它。

下面的示例程序：

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class Dom
{
   public static void main( String[] args ) throws Throwable
   {
      DocumentBuilderFactory dbf  = DocumentBuilderFactory.newInstance();
      dbf.setNamespaceAware( true );

      DocumentBuilder db = dbf.newDocumentBuilder();
      Document doc = db.newDocument();

      Element root = doc.createElement( "root" );
      root.setAttribute( "xmlns:m" , "http://www.lfinance.fr/blog-rachat-credits" );
      root.setAttribute( "xmlns:rt", "http://www.lfinance.fr/forum-rachat-credits" );
      doc.appendChild( root );

      Element elt = doc.createElement( "simple" );
      elt.setAttribute( "m:FC_TargetPath"   , "false" );
      elt.setAttribute( "m:FC_KeepInContent", "false" );
      elt.setAttribute( "rt:filterable"     , "false" );

      root.appendChild( doc.createTextNode( "\n\t" ));
      root.appendChild( elt );
      root.appendChild( doc.createTextNode( "\n" ));
      TransformerFactory.newInstance().newTransformer().transform(
         new DOMSource( doc ),
         new StreamResult( System.out ));
   }
}

输出：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root
    xmlns:m="http://www.lfinance.fr/blog-rachat-credits"
    xmlns:rt="http://www.lfinance.fr/forum-rachat-credits">
    <simple
        m:FC_KeepInContent="false"
        m:FC_TargetPath="false"
        rt:filterable="false" />
</root>

“我出错了”我们无法确定它是什么。请确保在xml文档中为m和rt声明了名称空间？你得到的错误是什么？反问：你至少试过在互联网上寻找错误吗？

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class Dom
{
   public static void main( String[] args ) throws Throwable
   {
      DocumentBuilderFactory dbf  = DocumentBuilderFactory.newInstance();
      dbf.setNamespaceAware( true );

      DocumentBuilder db = dbf.newDocumentBuilder();
      Document doc = db.newDocument();

      Element root = doc.createElement( "root" );
      root.setAttribute( "xmlns:m" , "http://www.lfinance.fr/blog-rachat-credits" );
      root.setAttribute( "xmlns:rt", "http://www.lfinance.fr/forum-rachat-credits" );
      doc.appendChild( root );

      Element elt = doc.createElement( "simple" );
      elt.setAttribute( "m:FC_TargetPath"   , "false" );
      elt.setAttribute( "m:FC_KeepInContent", "false" );
      elt.setAttribute( "rt:filterable"     , "false" );

      root.appendChild( doc.createTextNode( "\n\t" ));
      root.appendChild( elt );
      root.appendChild( doc.createTextNode( "\n" ));
      TransformerFactory.newInstance().newTransformer().transform(
         new DOMSource( doc ),
         new StreamResult( System.out ));
   }
}

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<root
    xmlns:m="http://www.lfinance.fr/blog-rachat-credits"
    xmlns:rt="http://www.lfinance.fr/forum-rachat-credits">
    <simple
        m:FC_KeepInContent="false"
        m:FC_TargetPath="false"
        rt:filterable="false" />
</root>