如何将 xml 文档中的节点附加到现有 xml 文档

Question

我的 a.xml 中有锦标赛列表：

<tournaments>

    <tournament>
        <name>a</name>
    </tournament>

    <tournament>
        <name>b</name>
    </tournament>

    <tournament>
        <name>c</name>
    </tournament>

</tournaments>

然后我在 b.xml 中有一场锦标赛

<tournament>
    <name>d</name>
</tournament>

我如何将文档 b.xml 附加到 a.xml 作为另一场锦标赛？

这就是我想要的：

<tournaments>

    <tournament>
        <name>a</name>
    </tournament>

    <tournament>
        <name>b</name>
    </tournament>

    <tournament>
        <name>c</name>
    </tournament>

    <tournament>
        <name>d</name>
    </tournament>

</tournaments>

Answer 1

1. 获取 Node 从第一个 < a href="http://download.oracle.com/javase/6/docs/api/org/w3c/dom/Document.html" rel="noreferrer">文档；
2. 采用 Node （参见 Document.adopt(Node)) 从第一个 文档 到第二个 文档；
3. Appent 采用 Node 作为子节点第二个 文档 结构（请参阅节点.appendChild(Node)

更新。
代码：

DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = documentBuilderFactory.newDocumentBuilder();

Document tournament = builder.parse(new File("b.xml"));
Document tournaments = builder.parse(new File("a.xml"));

Node tournamentElement = tournament.getFirstChild();
Node ndetournament = tournaments.getDocumentElement();
Node firstDocImportedNode = tournaments.adoptNode(tournamentElement);
ndetournament.appendChild(firstDocImportedNode);

TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.transform(new DOMSource(tournaments), new StreamResult(System.out));

结果：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<tournaments>
    <tournament>
        <name>a</name>
    </tournament>

    <tournament>
        <name>b</name>
    </tournament>

    <tournament>
        <name>c</name>
    </tournament>
<tournament>
    <name>d</name>
</tournament>
</tournaments>

Answer 2

这对你有用吗？

import java.io.StringBufferInputStream;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

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

public class Tournament {

  private static final String tournamentData =
    "  <tournaments>" +
    "    <tournament>" +
    "        <name>a</name>" +
    "    </tournament>" +
    "    <tournament>" +
    "        <name>b</name>" +
    "    </tournament>" +
    "    <tournament>" +
    "        <name>c</name>" +
    "    </tournament>" +
    "</tournaments>";


  private static final String tournamentB =
    "    <tournament>" +
    "        <name>d</name>" +
    "    </tournament>";

  private static DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();

  public static void main(String[] args) {
    try {
      Document currentTournaments = getCurrentTournaments();
      Element tournament =  getNewTournament();
      Element ndetournament = (Element) currentTournaments.getElementsByTagName("tournaments").item(0);
      Node firstDocImportedNode = currentTournaments.importNode(tournament, true);
      ndetournament.appendChild(firstDocImportedNode);
    } catch (Exception e) {
      e.printStackTrace();
    }
  }

  private static Document getCurrentTournaments() throws Exception{
    DocumentBuilder builder = dbFactory.newDocumentBuilder();
    Document docTournament = builder.parse(new StringBufferInputStream(tournamentData));
    return docTournament;
  }

  private static Element getNewTournament() throws Exception{
    DocumentBuilder builder = dbFactory.newDocumentBuilder();
    Document newTournament = builder.parse(new StringBufferInputStream(tournamentData));
    Element tournament = newTournament.getDocumentElement();
    return tournament;
  }
}

您可以修改 getXXXX() 函数以适合您自己的代码