一个校验文件里面是否只有英文字符的程序

import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class VerifyIsEnglishCode
{
    private static final File FILE_PATH = new File("file");
    private List<File> fileList;
    private File logFile;
    private StringBuffer errorMessage;

    public VerifyIsEnglishCode()
    {
        fileList = Arrays.asList(FILE_PATH.listFiles());
        errorMessage = new StringBuffer();

        getFileList();
    }

    public void getFileList()
    {
        for (File file : fileList)
        {
            try
            {
                BufferedReader bufferedReader = new BufferedReader(new FileReader(file));
                String fileLineContent = "";
                int lineCount = 0;
                while ((fileLineContent = bufferedReader.readLine()) != null)
                {
                    lineCount++;
                    verifyMessage(file, fileLineContent, lineCount);
                }

            } catch (FileNotFoundException e)
            {
                e.printStackTrace();
            } catch (IOException e)
            {
                e.printStackTrace();
            }
        }
        if (errorMessage.length() > 0)
        {
            try
            {
                writeErrorMessge();
            } catch (IOException e)
            {
                e.printStackTrace();
            }
        } else
        {
            System.out.println("OK,没有发现非英文字符");
        }
    }

    private void writeErrorMessge()
            throws IOException
    {
        System.out.println(errorMessage.toString());
        SimpleDateFormat bartDateFormat = new SimpleDateFormat("yyyy_dd_MM_HH_mm_ss");
        logFile = new File("log/" + bartDateFormat.format(new Date()) + ".txt");
        logFile.createNewFile();
        FileWriter fileWriter = new FileWriter(logFile);
        fileWriter.write(errorMessage.toString());
        fileWriter.close();
    }

    private void verifyMessage(File file, String fileLineContent, int lineCount)
    {
        Pattern pattern = Pattern.compile("[^a-zA-Z0-9\\s=.,\\\"\\\\?!:~`@#$%^&*()_\\-+';<>/]");
        Matcher matcher = pattern.matcher(fileLineContent);
        if (matcher.find() && fileLineContent.trim().length() > 0)
        {
            errorMessage.append(file.getAbsolutePath()).append("\t")
                    .append(lineCount).append("\t\t")
                    .append(fileLineContent).append("\n");

        }
    }

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