使用Java將兩個XML文件合併到一個XML文件中

Question

我一直堅持如何組合兩個不同的XML文件（它具有相同的結構）。當我對它做一些研究時，人們會說必須使用像DOM或StAX這樣的XML解析器。但不能與常規的IOStream一起使用？我目前正在嘗試使用IOStream的幫助，但這不能解決我的目的，它更復雜。

例如，我試過的是;

   public class GUI { 

      public static void main(String[] args) throws Exception { 

      // Creates file to write to 
      Writer output = null; 
      output = new BufferedWriter(new FileWriter("C:\\merged.xml")); 
      String newline = System.getProperty("line.separator"); 

      output.write(""); 

      // Read in xml file 1 
      FileInputStream in = new FileInputStream("C:\\1.xml"); 
      BufferedReader br = new BufferedReader(new InputStreamReader(in)); 
      String strLine; 

      while ((strLine = br.readLine()) != null) { 

      if (strLine.contains("<MemoryDump>")){ 
      strLine = strLine.replace("<MemoryDump>", "xmlns:xsi"); 
      } 
      if (strLine.contains("</MemoryDump>")){ 
      strLine = strLine.replace("</MemoryDump>", "xmlns:xsd"); 
      } 

      output.write(newline); 
      output.write(strLine); 

      System.out.println(strLine); 
      } 

      // Read in xml file 2 
      FileInputStream in = new FileInputStream("C:\\2.xml"); 
      BufferedReader br1 = new BufferedReader(new InputStreamReader(in)); 
      String strLine1; 

      while ((strLine1 = br1.readLine()) != null) { 

      if (strLine1.contains("<MemoryDump>")){ 
      strLine1 = strLine1.replace("<MemoryDump>", ""); 
      } 
      if (strLine1.contains("</MemoryDump>")){ 
      strLine1 = strLine1.replace("</MemoryDump>", ""); 
      } 

      output.write(newline); 
      output.write(strLine1); 

我請求您請讓我知道如何通過添加其他內容來合併兩個XML文件。如果你可以提供一些示例鏈接，那將是非常棒的！！

謝謝您提前..！ System.out.println（strLine1）; }

}

Answer 1

不完全相信你希望做什麼。合併是否意味着：

a。您想要合併2個DOM的內容，並創建一個對象模型（一個有效的模型），並附加節點

b。你想合併這兩個文件一個接一個，而不關心實際內容

如果它是一個，使用XML解析器。當然，你可以手動編寫這些東西，並嘗試將流處理成dom對象，但是你會重寫很多這些解析器的用途。爲什麼要重寫那些已經存在的東西。

如果是b，只是做一個愚蠢的副本。複製第一個文件（再次使用實用程序，例如apache常用的FileUtil允許您複製文件。除非必要，否則不要寫入），打開一個IO流到複製的文件，然後讀取和寫入第二個文件。

Answer 2

作爲一般規則，絕對不要在詞法級別對XML進行任何處理：始終使用XML解析器。 （如果（a）您是一位XML專家，那麼您可以打破此規則，因此您知道可能出錯的地方，以及（b）您知道結果始終不必是正確的。）

其次，進行這種處理最簡單的方法是使用爲該作業設計的語言，如XSLT或XQuery。使用Java使它非常花費工作。

如果您對要合併的文件類型更具體，以及希望輸出結果如何，我們可以給出更準確的答案。

Answer 3

package com.cts.sterling.order; 

//package com.academy.ecommerce.sterling.userexits; 
import java.io.File; 
import javax.xml.parsers.DocumentBuilder; 
import javax.xml.parsers.DocumentBuilderFactory; 
import org.w3c.dom.Document; 
import org.w3c.dom.Element; 
import org.w3c.dom.NodeList; 
import com.cts.sterling.custom.accelerators.util.XMLUtil; 


public class MergeXml { 

    public static Document mergeXml(Document doc1, Document doc2) 

      throws Exception { 

     // Getting the attributes of OrderLine from document2 and document1 
     NodeList objOrderLineList2 = doc2.getElementsByTagName("OrderLine"); 
     NodeList objOrderLineList1 = doc1.getElementsByTagName("OrderLine"); 

     // Creating Element for OrderLine 
     Element eleOrderline2 = (Element) objOrderLineList2.item(0); 
     Element eleOrderline1 = (Element) objOrderLineList1.item(0); 

     // Declaring attributes as String array 
     String[] Line1={"LineType","LevelOfService"}; 

     // Copying attributes from document2 to document1 
     XMLUtil.copyAttributes(eleOrderline2, eleOrderline1, Line1); 

     // Getting the attributes of Extn from document2 and document1 
     NodeList objExtn2 = doc2.getElementsByTagName("Extn"); 
     NodeList objExtn1 =doc1.getElementsByTagName("Extn"); 

     // Creating Element for Extn 
     Element eleExtn2 = (Element) objExtn2.item(0); 
     Element eleExtn1 = (Element) objExtn1.item(0); 

     // Declaring attributes as String array 
     String[] Line2={"ExtnMediaCode","ExtnLastName","ExtnGroupID"}; 

     // Copying attributes from document2 to document1 
     XMLUtil.copyAttributes(eleExtn2, eleExtn1, Line2); 

     // Getting the attributes of WSIAddnlOrderLineData from document2 and document1 
     NodeList objAddln2 = doc2.getElementsByTagName("WSIAddnlOrderLineData"); 
     NodeList objAddln1 =doc1.getElementsByTagName("WSIAddnlOrderLineData"); 

     // Creating Element for WSIAddnlOrderLineData 
     Element eleAddln2 = (Element) objAddln2.item(0); 
     Element eleAddln1 = (Element) objAddln1.item(0); 

     // Declaring attributes as String array 
     String[] Line3 ={"ExtnShipMode" , "ExtnDeliverTogether","ExtnComponentReplacementIndicator","ExtnGiftCardRequiredIndicator","ExtnReplOriginalItemID", 
       "ExtnSpecialHandlingIndicator","ExtnSpecialHandlingReasonCode","ExtnCardType","ExtnCardClass","ExtnEcomSuborderNo","ExtnEcomOrderLineNo", 
       "ExtnPFSFlag","ExtnSVCCarrierServiceCode","ExtnSVCSCAC","ExtnSVCUpgradeFlag","ExtnSVCSKUType","ExtnSVCTo","ExtnSVCFrom"}; 

     // Copying attributes from document2 to document1 
     XMLUtil.copyAttributes(eleAddln2, eleAddln1, Line3); 

     // Getting the attributes of Instruction from document2 and document1 
     NodeList objInst2 = doc2.getElementsByTagName("Instruction"); 
     NodeList objInst1 =doc1.getElementsByTagName("Instruction"); 

     // Creating Element for Instruction 
     Element eleInst2 = (Element) objInst2.item(0); 
     Element eleInst1 = (Element) objInst1.item(0); 

     // Declaring attributes as String array 
     String[] Line4 ={"InstructionText","InstructionType","SequenceNo","InstructionURL","InstructionUsage"}; 

     // Copying attributes from document2 to document1 
     XMLUtil.copyAttributes(eleInst2, eleInst1, Line4); 

     //Printing output document 
     System.out.println(XMLUtil.getString(doc1)); 
     return doc1; 

    } 
    //Main method 
    public static void main(String[] args) { 
     try{ 

      File file1 = new File("D:/Handson/merge1.xml"); 
      DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); 
      DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); 
      Document doc1 = dBuilder.parse(file1); 
      File file2 = new File("D:/Handson/merge2.xml"); 
      Document doc2 = dBuilder.parse(file2); 

      //calling the method 
      mergeXml(doc1,doc2); 
     } 
     catch (Exception e) { 
      e.printStackTrace(); 
     } 

    } 
}