Truy xuất tập tin trong Java, hiển thị nội dung và đếm số từ?

package bai_4;

import java.awt.EventQueue;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;

import java.awt.Font;

import javax.swing.JTextField;
import javax.swing.JTextArea;

import java.awt.Color;

import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class B4_1_DemSoTu {

	private JFrame frmmST;
	private JTextField txtSoTu;
	private JTextField txtTenTapTin;

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			
			public void run() {
				try {
					B4_1_DemSoTu window = new B4_1_DemSoTu();
					window.frmmST.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the application.
	 */
	public B4_1_DemSoTu() {
		initialize();
	}

	/**
	 * Initialize the contents of the frame.
	 */
	private void initialize() {
		frmmST = new JFrame();
		frmmST.setTitle("u0110u1EBFm su1ED1 tu1EEB trong tu1EADp tin");
		frmmST.setBounds(100, 100, 529, 401);
		frmmST.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frmmST.getContentPane().setLayout(null);
		
		JLabel lblNewLabel = new JLabel("u0110u1EBFm su1ED1 tu1EEB trong tu1EADp tin");
		lblNewLabel.setFont(new Font("Tahoma", Font.BOLD, 12));
		lblNewLabel.setBounds(172, 33, 204, 14);
		frmmST.getContentPane().add(lblNewLabel);
		
		JLabel lblChnTpTin = new JLabel("Chu1ECDn tu1EADp tin:");
		lblChnTpTin.setBounds(37, 75, 92, 14);
		frmmST.getContentPane().add(lblChnTpTin);
		
		JButton btnChon = new JButton("...");
		btnChon.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				//code here
				
					FileInputStream fis = null;
					try {
						String path = null;
						fis = new FileInputStream(path);

						String data = "";
						byte[] buffer = new byte[fis.available()];

						fis.read(buffer);

						data = new String(buffer);

						System.out.println(data);

					} catch (FileNotFoundException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} catch (IOException e) {
						// TODO Auto-generated catch block
						e.printStackTrace();
					} finally {
						try {
							fis.close();
						} catch (IOException e) {
							// TODO Auto-generated catch block
							e.printStackTrace();
						}
					}
				
					FileOutputStream fos = null;
					try {
						String path = null;
						fos = new FileOutputStream(path);
						String data;
						fos.write(data.getBytes());
						System.out.println("Ghi file thanh cong !");

					} catch (FileNotFoundException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					} catch (IOException e1) {
						// TODO Auto-generated catch block
						e1.printStackTrace();
					} finally {
						try {
							fos.close();
						} catch (IOException e1) {
							// TODO Auto-generated catch block
							e1.printStackTrace();
						}
					}

				}
		});
		btnChon.setBounds(424, 71, 45, 23);
		frmmST.getContentPane().add(btnChon);
		
		JLabel lblNiDung = new JLabel("Nu1ED9i dung:");
		lblNiDung.setBounds(37, 100, 92, 14);
		frmmST.getContentPane().add(lblNiDung);
		
		JTextArea txtNoiDung = new JTextArea();
		txtNoiDung.setEditable(false);
		txtNoiDung.setBackground(Color.WHITE);
		txtNoiDung.setRows(5);
		txtNoiDung.setBounds(122, 105, 347, 137);
		frmmST.getContentPane().add(txtNoiDung);
		
		JLabel lblST = new JLabel("Su1ED1 tu1EEB:");
		lblST.setBounds(37, 270, 92, 14);
		frmmST.getContentPane().add(lblST);
		
		txtSoTu = new JTextField();
		txtSoTu.setEditable(false);
		txtSoTu.setBounds(122, 267, 347, 20);
		frmmST.getContentPane().add(txtSoTu);
		txtSoTu.setColumns(10);
		
		JButton btnDoc = new JButton("u0110u1ECDc tu1EADp tin");
		btnDoc.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				//code here
					private String docNoiDungFile(File file) throwsIOException{
					FileReader fr = newFileReader(file);
					char[] cbuf = newchar[(int)file.length()];
					fr.read(cbuf);
					String noiDung = String.valueOf(cbuf);
					fr.close();
					return noiDung;
				}
			}
		});
		btnDoc.setBounds(119, 313, 103, 23);
		frmmST.getContentPane().add(btnDoc);
		
		JButton btnDemsoTu = new JButton("u0110u1EBFm su1ED1 tu1EEB");
		btnDemsoTu.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				// code here
				private int demSoTu(String text){
					String[] ls = text.split("[\s\.\,\:\;\/\|\\]+");
					if(ls != null){
						return ls.length;
					}
				return 0;
			}
		});
		btnDemsoTu.setBounds(266, 313, 110, 23);
		frmmST.getContentPane().add(btnDemsoTu);
		
		txtTenTapTin = new JTextField();
		txtTenTapTin.setBounds(122, 72, 294, 20);
		frmmST.getContentPane().add(txtTenTapTin);
		txtTenTapTin.setColumns(10);
		
	} }

Mọi người giúp em với ạ, bài tập là chọn tập tin, hiển thị nội dung và đếm số từ . em làm mãi mà nó vẫn sai ạ . có ai khai sáng cho em ko ?