如何在java中的另一個xml文檔中插入xml節點作爲第一個孩子？例如：

Question

。根=

<root> 
    <param value="abc"> 
    <param value="bc"> 
</root> 

NodeToInsert可能是

<insert><parameterDesc>afds</parameterDesc></insert> 

輸出應該是：

<root> 
    <insert><parameterDesc>afds</parameterDesc></insert> 
    <param value="abc"> 
    <param value="bc"> 
</root> 

Answer 1

如果事實證明，我只是做了你的功課，你我會真的很惱火。

package com.akonizo.examples; 

import java.io.ByteArrayInputStream; 
import java.io.StringWriter; 

import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.transform.OutputKeys; 
import javax.xml.transform.Transformer; 
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; 
import org.w3c.dom.Node; 
import org.w3c.dom.Text; 

public class XmlInsertExample { 

    /** 
    * @param args 
    */ 
    public static void main(String[] args) { 
     String initial = "<root><param value=\"abc\"/><param value=\"bc\"/></root>"; 

     try { 
      // Parse the initial document 
      ByteArrayInputStream is = new ByteArrayInputStream(initial.getBytes()); 
      DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); 
      DocumentBuilder db = dbf.newDocumentBuilder(); 
      Document doc = db.parse(is); 

      // Create the new xml fragment 
      Text a = doc.createTextNode("afds"); 
      Node p = doc.createElement("parameterDesc"); 
      p.appendChild(a); 
      Node i = doc.createElement("insert"); 
      i.appendChild(p); 
      Element r = doc.getDocumentElement(); 
      r.insertBefore(i, r.getFirstChild()); 
      r.normalize(); 

      // Format the xml for output 
      Transformer transformer = TransformerFactory.newInstance().newTransformer(); 
      transformer.setOutputProperty(OutputKeys.INDENT, "yes"); 

      // initialize StreamResult with File object to save to file 
      StreamResult result = new StreamResult(new StringWriter()); 
      DOMSource source = new DOMSource(doc); 
      transformer.transform(source, result); 

      System.out.println(result.getWriter().toString()); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
} 

結果將是：

<?xml version="1.0" encoding="UTF-8" standalone="no"?> 
<root> 
    <insert> 
    <parameterDesc>afds</parameterDesc> 
    </insert> 
    <param value="abc"/> 
    <param value="bc"/> 
</root>