Sax Parser - XMLファイルを指定されたサイズに分割できません

Question

XMLを読み込み、SAX Parserを使用して複数のファイルに分割する方法がいくつか難しいです。我々は、生成されたXML以下の入力に持っていることを考えてみましょう：

<?xml version="1.0" encoding="utf-8"?> 
<record-table> 
    <record> 
    <record_id>12345</record_id> 
    <record_rows> 
     <record_row>str1234</record_row> 
    </record_rows> 
    </record> 
    <footer> 
    <record_count>12345</record_count> 
    <record_row_count>12345</record_row_count> 
    </footer> 
</record-table> 

それはきれいで甘い作るために、私は「TODO」リスト作っ：この瞬間のよう

XML splitting: 
* Splits file generated by XML generation functionality in multiple files of configurable size. 
* Asks the user XML file location. 
* Asks the user maximum single file size in bytes. 
* Each split file must conform to schema. 
* Elements record_count and record_row_count should contain actual numbers for each file. 
* Files should be split as close to specified limit as possible. 

を、私は読むために複数の試みを作っプログラムは実行されますが、何も実行されません。

ドラフトコード：

public static void splitXML(File fileToSplit, int splitFileSize) { 
    try { 
     SAXParserFactory factory = SAXParserFactory.newInstance(); 
     SAXParser parser = factory.newSAXParser(); 
     XMLReader reader = parser.getXMLReader(); 

     reader.parse(new InputSource(new FileInputStream(fileToSplit))); 
     reader.setContentHandler(new DefaultHandler() { 

      public static final String DIRECTORY = "target/results"; 

      private int fileSize = 0; 

      private File fileLocation; 

      // counts number of files created 
      private int fileCount = 0; 

      // counts characters to decide where to split file 
      private long charCount = 0; 
      // data line buffer (is reset when the file is split) 
      private StringBuilder recordRowDataLines = new StringBuilder(); 

      // temporary variables used for the parser events 
      private String currentElement = null; 
      private String currentRecordId = null; 
      private String currentRecordRowData = null; 

      public final long TAG_CHAR_SIZE = 5; 

      @Override 
      public void startDocument() throws SAXException { 
       File directory = new File(DIRECTORY); 
       if(!directory.exists()) 
        directory.mkdir(); 
      } 

      @Override 
      public void startElement(String uri, String localName, String qName, Attributes attributes) throws SAXException { 
       currentElement = qName; 
      } 

      @Override 
      public void endElement(String uri, String localName, String qName) throws SAXException { 
       if(qName.equals("record_rows")) { 
        try { 
         savePatch(); 
        } catch (IOException e) { 
         throw new SAXException(e); 
        } 
       } 
       if (qName.equals("record_row")) { // one record finished - save in buffer & calculate size so far 
        charCount += tagSize("record_row"); 
        recordRowDataLines.append("<record_row>") 
          .append(currentRecordRowData) 
          .append("</record_row>"); 
        if (charCount >= fileSize) { // if max size was reached, save what was read so far in a new file 
         try { 
          savePatch(); 
         } catch (IOException ex) { 
          throw new SAXException(ex); 
         } 
        } 
       } 
       currentElement = null; 
      } 

      @Override 
      public void characters(char[] ch, int start, int length) throws SAXException { 
       System.out.println(new String(ch, start, length)); 
       if (currentElement == null) { 
        return; 
       } 
       if (currentElement.equals("record_id")) { 
        currentRecordId = new String(ch, start, length); 
       } 
       if (currentElement.equals("record_row")) { 
        currentRecordRowData = new String(ch, start, length); 
        charCount += currentRecordRowData.length(); // storing size so far 
       } 
      } 

      public long tagSize(String tagName) { 
       return TAG_CHAR_SIZE + tagName.length() * 2; // size of text + tags 
      } 

      public void savePatch() throws IOException { 
       ++fileCount; 
       StringBuilder stringBuilder = new StringBuilder(); 
       stringBuilder.append("<record part='") 
         .append(fileCount) 
         .append("'><record_id>") 
         .append(currentRecordId) 
         .append("</record_id>") 
         .append("<record_rows>") 
         .append(recordRowDataLines) 
         .append("</record_rows></record>"); 
       File fragment = new File(DIRECTORY, "data_part_" + fileCount + ".xml"); 
       System.out.println("File " + fragment.getAbsolutePath() + "has been saved!"); 

       try(FileWriter out = new FileWriter(fragment)){ 
        out.write(stringBuilder.toString()); 
       } catch (Exception e) { 
        e.printStackTrace(); 
       } 

       //flush current information that was saved. 
       recordRowDataLines = new StringBuilder(); 
       charCount = 0; 
      } 
     }); 

    } catch (ParserConfigurationException | SAXException | IOException e) { 
     e.printStackTrace(); 
    } 
} 

メインクラスをどのように見えるか：

public class Main { 

    public static void main(String[] args) { 
     System.out.println("Welcome!"); 

     <omitted> 
     File f = CommonUtils.requestFilePath(); 
     int fileSize = CommonUtils.requestUserValueInt("Enter file split size : "); 
     XMLSplitter.splitXML(f, fileSize); 
    } 
} 

は、私はカント何を、見ることができます。助けてください。

Answer 1

構文解析の前にsetContentHandlerを呼び出す必要があります。