split xml

before:

<?xml version="1.0" encoding="UTF-8"?>
<DOC>

    <AUTHOR>
        <FIRSTNAME>Firstname</FIRSTNAME> 
        <LASTNAME>Lastname</LASTNAME>
    </AUTHOR>
    <AUTHOR>
        <FIRSTNAME>Firstname1</FIRSTNAME> 
        <LASTNAME>Lastname1</LASTNAME>
    </AUTHOR>
    <PARAGRAPH>
        <LINE N="1">First line.</LINE> 
        <LINE N="2">Second line.</LINE> 
    </PARAGRAPH>

    <PARAGRAPH>
        <LINE N="3">Third line.</LINE> 
        <LINE N="4">Fourth line.</LINE>        
    </PARAGRAPH>
</DOC>

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;

public class SplitXML {

	/**
	 * @param args
	 * @throws IOException
	 */
	public static void main(String[] args) throws IOException {
		// TODO Auto-generated method stub
		List<String> data = FileUtils.readLines(new File("d:\\test.xml"));
		List<String> authorList = new ArrayList<String>();
		List<String> paragraphList = new ArrayList<String>();
		String authorS = "<AUTHOR";
		String authorE = "</AUTHOR>";
		String paragraphS = "<PARAGRAPH";
		String paragraphE = "</PARAGRAPH>";
		boolean isauthorS = false;
		boolean isparagraphS = false;
		
		boolean isauthorE = false;
		boolean isparagraphE = false;
		for (String line : data) {
			boolean ishit = false;
		System.out.println(line);

			if (line.contains(authorS)) {
				isauthorS = true;
				
			} else if (line.contains(authorE)) {
				isauthorE = true;
			} else if (line.contains(paragraphS)) {
				isparagraphS = true;
			} else if (line.contains(paragraphE)) {
				isparagraphE = true;
			}
			if(isauthorS||isauthorE){
				authorList.add(line);
				if(isauthorE){
					isauthorS =false;
					isauthorE =false;
					ishit= true;
				}
			}else if(isparagraphS||isparagraphE){
				paragraphList.add(line);
				if(isparagraphE){
					isparagraphE =false;
					isparagraphS =false;
					ishit= true;
				}
			}
			if(!isauthorS&&!isparagraphS&&!isauthorE&&!isparagraphE&&!ishit){
					authorList.add(line);
					paragraphList.add(line);
				
			}
		}
		FileUtils.writeLines(new File("d:/paragraphList.txt"), paragraphList);
		FileUtils.writeLines(new File("d:/authorList.txt"), authorList);
	}

}

after

<?xml version="1.0" encoding="UTF-8"?>
<DOC>

    <PARAGRAPH>
        <LINE N="1">First line.</LINE> 
        <LINE N="2">Second line.</LINE> 
    </PARAGRAPH>

    <PARAGRAPH>
        <LINE N="3">Third line.</LINE> 
        <LINE N="4">Fourth line.</LINE>        
    </PARAGRAPH>
</DOC>


<?xml version="1.0" encoding="UTF-8"?>
<DOC>

    <AUTHOR>
        <FIRSTNAME>Firstname</FIRSTNAME> 
        <LASTNAME>Lastname</LASTNAME>
    </AUTHOR>
    <AUTHOR>
        <FIRSTNAME>Firstname1</FIRSTNAME> 
        <LASTNAME>Lastname1</LASTNAME>
    </AUTHOR>

</DOC>