mybatis xml statement reader for making html form

NewParser.java

package testDate;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;

public class NewParser extends JFrame implements ActionListener{

	private static final long serialVersionUID = 1L;
	private static final String PROPERTY = "property=\"";
	private static final String sharp = "#";
	
	JTextArea jta = new JTextArea();
	JTextArea jta2 = new JTextArea();
	
	public NewParser() {
		
		JPanel jpanel = new JPanel();
		jpanel.setLayout(new GridLayout(2, 1));
		
		JButton btn = new JButton("입력!");
		btn.addActionListener(this);

		jpanel.add(jta);
		jpanel.add(jta2);
		
		add(jpanel, BorderLayout.CENTER);
		add(btn, BorderLayout.SOUTH);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true);
		setBounds(200, 200, 1200, 700);
		setTitle("NewParser");
	}

	public static void main(String[] args){
		new NewParser();
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		Set<String> variableList = new HashSet<>();
		String origianlText = jta.getText();
		variableList.addAll(checkContentsAddItems(origianlText, sharp, sharp));
		variableList.addAll(checkContentsAddItems(origianlText, PROPERTY, "\""));
		
		jta2.setText(makeHtmlForm(variableList));
	}
	
	public Set<String> checkContentsAddItems(String contents, String firstCriteria, String lastCriteria ){
		int firstLocation=0, lastLocation=0;
		Set<String> items = new HashSet<>();
		String item=null;
		
		while(true){
			try{
				if(!contents.contains(firstCriteria))
					break;
				
				firstLocation = contents.indexOf(firstCriteria)+firstCriteria.length();
				lastLocation = contents.indexOf(lastCriteria, firstLocation);
				item = contents.substring(firstLocation, lastLocation);
				
				items.add(item);
				contents = contents.substring(lastLocation+1);
			}catch(StringIndexOutOfBoundsException err){
				System.out.println("반복 루프 종료"); break;
			}
		}
		return items;
	}
	
	public String makeHtmlForm(Set<String> items){
		StringBuilder builder = new StringBuilder();
		builder.append("<hr>\n<h4>제목</h4> \n <form action=\"\" method=\"get\"> \n");
		for (String item : items) {
			builder.append("\t("+item+") <input type=\"text\" name=\""+item+ "\" value=\"\" /> \n");
		}
		builder.append("<input type=\"submit\" value=\"확인\"> \n");
		builder.append("</form>");
		return builder.toString();
	}
}