如何使用Java和Stax从Xml中删除元素及其子元素

我有一个大文件，其中包含这样的数据

<releases>
   <release>
   ......
      <companies>
         <company>
         </company>
      </companies>
   </release>
   <release>
   ......
</releases>

---

我想我现在有了它，Stax会逐个元素进行处理，所以我需要标记何时找到起始元素，设置一个变量以指示在到达结束元素之前应忽略所有后续数据

代码示例：

import javax.xml.stream.*;
import javax.xml.stream.events.XMLEvent;
import java.io.*;

public class FixDb
{

    public static void main(String[] args) throws Exception
    {
        File source = new File(args[0]);
        if(!source.exists())
        {
            System.out.println("File:"+source+ " does not exist");
        }

        File target = new File(source+".new");

        XMLInputFactory  inputFactory = XMLInputFactory.newInstance();
        XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
        InputStream in = new FileInputStream(source);
        XMLEventReader reader = inputFactory.createXMLEventReader(in);

        OutputStream out = new FileOutputStream(target);
        XMLEventWriter writer =  outputFactory.createXMLEventWriter(out);
        XMLEvent event;

        boolean deleteSection = false;
        while(reader.hasNext())
        {
            event = reader.nextEvent();
            if(event.getEventType() == XMLStreamConstants.START_ELEMENT && event.asStartElement().getName().toString().equalsIgnoreCase("companies"))
            {
                deleteSection=true;
                continue;
            }
            else if(event.getEventType() == XMLStreamConstants.END_ELEMENT && (event.asEndElement().getName().toString().equalsIgnoreCase("companies")))
            {
                deleteSection=false;
                continue;
            }
            else if(deleteSection)
            {
                continue;
            }
            else
            {
                writer.add(event);
            }
        }
    }
}

        XMLInputFactory  inputFactory = XMLInputFactory.newInstance();
        XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
        InputStream in = new FileInputStream(source);
        XMLEventReader reader = inputFactory.createXMLEventReader(in);

        OutputStream out = new FileOutputStream(target);
        XMLEventWriter writer =  outputFactory.createXMLEventWriter(out);
        XMLEvent event;
        while(reader.hasNext()){
            event = reader.nextEvent();
            writer.add(event);
            if(event.getEventType() == XMLStreamConstants.START_ELEMENT)
            {
                if(event.asStartElement().getName().toString().equalsIgnoreCase("companies"))
                {
                    System.out.println("Deleting:"+event);
                    continue;
                }
                else
                {
                    writer.add(event);
                }
            }
            else
            {
                writer.add(event);
            } 
        }

import javax.xml.stream.*;
import javax.xml.stream.events.XMLEvent;
import java.io.*;

public class FixDb
{

    public static void main(String[] args) throws Exception
    {
        File source = new File(args[0]);
        if(!source.exists())
        {
            System.out.println("File:"+source+ " does not exist");
        }

        File target = new File(source+".new");

        XMLInputFactory  inputFactory = XMLInputFactory.newInstance();
        XMLOutputFactory outputFactory = XMLOutputFactory.newInstance();
        InputStream in = new FileInputStream(source);
        XMLEventReader reader = inputFactory.createXMLEventReader(in);

        OutputStream out = new FileOutputStream(target);
        XMLEventWriter writer =  outputFactory.createXMLEventWriter(out);
        XMLEvent event;

        boolean deleteSection = false;
        while(reader.hasNext())
        {
            event = reader.nextEvent();
            if(event.getEventType() == XMLStreamConstants.START_ELEMENT && event.asStartElement().getName().toString().equalsIgnoreCase("companies"))
            {
                deleteSection=true;
                continue;
            }
            else if(event.getEventType() == XMLStreamConstants.END_ELEMENT && (event.asEndElement().getName().toString().equalsIgnoreCase("companies")))
            {
                deleteSection=false;
                continue;
            }
            else if(deleteSection)
            {
                continue;
            }
            else
            {
                writer.add(event);
            }
        }
    }
}