Created
June 9, 2025 07:06
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Java xml file parser
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| import javax.xml.stream.*; | |
| import javax.xml.stream.events.XMLEvent; | |
| import java.io.*; | |
| public class SplitXmlByMessage { | |
| public static void main(String[] args) throws Exception { | |
| String inputFile = "input.xml"; // Path to your XML file | |
| String outputDir = "output_messages"; // Directory to save message files | |
| // Create output directory if it doesn't exist | |
| new File(outputDir).mkdirs(); | |
| // Read the file, remove XML declarations, and wrap with a root element | |
| StringBuilder sb = new StringBuilder(); | |
| sb.append("<root>\n"); | |
| try (BufferedReader br = new BufferedReader(new FileReader(inputFile))) { | |
| String line; | |
| while ((line = br.readLine()) != null) { | |
| // Skip XML declaration lines | |
| if (!line.trim().startsWith("<?xml")) { | |
| sb.append(line).append("\n"); | |
| } | |
| } | |
| } | |
| sb.append("</root>"); | |
| // Parse the wrapped XML | |
| XMLInputFactory factory = XMLInputFactory.newInstance(); | |
| XMLEventReader reader = factory.createXMLEventReader(new StringReader(sb.toString())); | |
| int messageCount = 0; | |
| boolean insideMessage = false; | |
| StringWriter messageWriter = null; | |
| XMLOutputFactory outputFactory = XMLOutputFactory.newInstance(); | |
| XMLEventWriter xmlEventWriter = null; | |
| while (reader.hasNext()) { | |
| XMLEvent event = reader.nextEvent(); | |
| if (event.isStartElement() && event.asStartElement().getName().getLocalPart().equals("message")) { | |
| insideMessage = true; | |
| messageWriter = new StringWriter(); | |
| xmlEventWriter = outputFactory.createXMLEventWriter(messageWriter); | |
| xmlEventWriter.add(event); // Write the start <message> tag | |
| } else if (insideMessage) { | |
| xmlEventWriter.add(event); | |
| if (event.isEndElement() && event.asEndElement().getName().getLocalPart().equals("message")) { | |
| // End of <message> | |
| insideMessage = false; | |
| xmlEventWriter.close(); | |
| messageCount++; | |
| // Write to file | |
| String outputFileName = outputDir + "/message_" + messageCount + ".xml"; | |
| try (FileWriter fw = new FileWriter(outputFileName)) { | |
| fw.write(messageWriter.toString()); | |
| } | |
| } | |
| } | |
| } | |
| reader.close(); | |
| System.out.println("Done! " + messageCount + " message files created in " + outputDir); | |
| } | |
| } |
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