Java 托利党，可以阅读。 */ 静态公共列表getFileListing（最终文件aStartingDir）引发FileNotFoundException{ validateDirectory（aStartingDir）； 列表结果=getFileListing

托利党，可以阅读。 */ 静态公共列表getFileListing（最终文件aStartingDir）引发FileNotFoundException{ validateDirectory（aStartingDir）； 列表结果=getFileListingNoSort（aStartingDir）； 集合。排序（结果）； 返回结果； } //私人的// 静态私有列表getFileListingNoSort（最终文件aStartingDir）引发FileNotFoundException{ 列表结果=新建ArrayList（）； File[]filesAndDirs=aStartingDir.listFiles（）； List filesDirs=Arrays.asList（filesAndDirs）； for（文件：filesDirs）{ if（file.isDirectory（））{ 结果.添加（文件）； } 如果（！file.isFile（））{ //必须是一个目录 //递归调用！ List deeperList=getFileListingNoSort（文件）； 结果：addAll（deeperList）； } } 返回结果； } /** *目录是有效的，如果它存在，不代表文件，并且可以 *阅读。 */ 静态私有void validateDirectory（最终文件addirectory）引发FileNotFoundException{ if（aDirectory==null）{ 抛出新的IllegalArgumentException（“目录不应为null”）； } 如果（！aDirectory.exists（））{ 抛出新的FileNotFoundException（“目录不存在：“+A目录”）； } 如果（！aDirectory.isDirectory（））{ 抛出新的IllegalArgumentException（“不是目录：“+a目录”）； } 如果（！aDirectory.canRead（））{ 抛出新的IllegalArgumentException（“无法读取目录：“+A目录”）； } } }

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1+表示答案，10+表示通读整个问题。如答案中所述，代码发生了更改，更改的内容很少；）把它原样加回去，是我的错；）回答得好。我想补充一点，一般来说，我更喜欢使用File对象（如果有）而不是文件的字符串名。是的，问题是在扫描文件时应该增加它。您执行的类似操作：

totalFileScannedCount+=result.size（）

应该移到这里：

如果（file.isFile（））{

Scanner Scanner=new Scanner（new FileReader（file））；那么，增量将发生在考虑文件的情况下。

public class abc {

    /**
     * @param args
     * @throws FileNotFoundException
     */
    private static int totalLineCount = 0;
    private static int totalFileScannedCount = 0;

    public static void main(String[] args) throws FileNotFoundException {

        JFileChooser chooser = new JFileChooser();
        chooser.setCurrentDirectory(new java.io.File("C:" + File.separator));
        chooser.setDialogTitle("FILES ALONG WITH LINE NUMBERS");
        chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        chooser.setAcceptAllFileFilterUsed(false);
        if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
            Map<String, Integer> result = new HashMap<String, Integer>();
            File directory = new File(chooser.getSelectedFile().getAbsolutePath());

            List<File> files = getFileListing(directory);

            //print out all file names, in the the order of File.compareTo()
            for (File file : files) {
                System.out.println("Directory: "+file);
                result = getFileLineCount(file);
                totalFileScannedCount +=  result.size();
            }


            System.out.println("*****************************************");
            System.out.println("FILE NAME FOLLOWED BY LOC");
            System.out.println("*****************************************");

            for (Map.Entry<String, Integer> entry : result.entrySet()) {
                System.out.println(entry.getKey() + " ==> " + entry.getValue());
            }
            System.out.println("*****************************************");
            System.out.println("SUM OF FILES SCANNED ==>" + "\t" + totalFileScannedCount);
            System.out.println("SUM OF ALL THE LINES ==>" + "\t" + totalLineCount);

        }

    }

    public static Map<String, Integer> getFileLineCount(File directory) throws FileNotFoundException {
        Map<String, Integer> result = new HashMap<String, Integer>();

        File[] files = directory.listFiles(new FilenameFilter() {

            @Override
            public boolean accept(File directory, String name) {
                if (name.endsWith(".java")) {
                    return true;
                } else {
                    return false;
                }
            }
        });
        for (File file : files) {
            if (file.isFile()) {
                Scanner scanner = new Scanner(new FileReader(file));
                int lineCount = 0;
                try {
                    for (lineCount = 0; scanner.nextLine() != null; lineCount++);
                } catch (NoSuchElementException e) {
                    result.put(file.getName(), lineCount);
                    totalLineCount += lineCount;
                }
            }
        }

        return result;
    }

    /**
     * Recursively walk a directory tree and return a List of all
     * Files found; the List is sorted using File.compareTo().
     *
     * @param aStartingDir is a valid directory, which can be read.
     */
    static public List<File> getFileListing(
            File aStartingDir) throws FileNotFoundException {
        validateDirectory(aStartingDir);
        List<File> result = getFileListingNoSort(aStartingDir);
        Collections.sort(result);
        return result;
    }

    // PRIVATE //
    static private List<File> getFileListingNoSort(
            File aStartingDir) throws FileNotFoundException {
        List<File> result = new ArrayList<File>();
        File[] filesAndDirs = aStartingDir.listFiles();
        List<File> filesDirs = Arrays.asList(filesAndDirs);
        for (File file : filesDirs) {
            if(file.isDirectory()) {
                result.add(file); 
            }
            if (!file.isFile()) {
                //must be a directory
                //recursive call!
                List<File> deeperList = getFileListingNoSort(file);
                result.addAll(deeperList);
            }
        }
        return result;
    }

    /**
     * Directory is valid if it exists, does not represent a file, and can be read.
     */
    static private void validateDirectory(
            File aDirectory) throws FileNotFoundException {
        if (aDirectory == null) {
            throw new IllegalArgumentException("Directory should not be null.");
        }
        if (!aDirectory.exists()) {
            throw new FileNotFoundException("Directory does not exist: " + aDirectory);
        }
        if (!aDirectory.isDirectory()) {
            throw new IllegalArgumentException("Is not a directory: " + aDirectory);
        }
        if (!aDirectory.canRead()) {
            throw new IllegalArgumentException("Directory cannot be read: " + aDirectory);
        }
    }
}

com.abc package having files --->abc.java
com.def package having files --->abc.java
com.tyu package having files --->FileBrowse.java , FileCountLine.java

the outcome shown in console is... 


    Directory: C:\Users\vaio\Desktop\Demo\TESTRESULT\.settings
    Directory: C:\Users\vaio\Desktop\Demo\TESTRESULT\bin
    Directory: C:\Users\vaio\Desktop\Demo\TESTRESULT\src
    Directory: C:\Users\vaio\Desktop\Demo\TESTRESULT\src\com
    Directory: C:\Users\vaio\Desktop\Demo\TESTRESULT\src\com\abc
    Directory: C:\Users\vaio\Desktop\Demo\TESTRESULT\src\com\def
    Directory: C:\Users\vaio\Desktop\Demo\TESTRESULT\src\tyu
    *****************************************
    FILE NAME FOLLOWED BY LOC
    *****************************************
    FileBrowse.java ==> 95
    FileCountLine.java ==> 53
    *****************************************
    SUM OF FILES SCANNED ==> 4
    SUM OF ALL THE LINES ==> 296

public static void main(String[] args) throws FileNotFoundException {  
            //...  
            for (File file : files) {  
                System.out.println("Directory: "+file);  
                result = getFileLineCount(file);

result.put(file, lineCount);

result.put(file.getName(), lineCount);

for (Map.Entry<File, Integer> entry : result.entrySet()) {
    System.out.println(entry.getKey().getName() + " ==> " + entry.getValue());
}

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Scanner;

import javax.swing.JFileChooser;

public class abc {

    /**
     * @param args
     * @throws FileNotFoundException
     */
    private static int totalLineCount = 0;
    private static int totalFileScannedCount = 0;

    public static void main(final String[] args) throws FileNotFoundException {

        JFileChooser chooser = new JFileChooser();
        chooser.setCurrentDirectory(new java.io.File("C:" + File.separator));
        chooser.setDialogTitle("FILES ALONG WITH LINE NUMBERS");
        chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
        chooser.setAcceptAllFileFilterUsed(false);
        if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
            Map<File, Integer> result = new HashMap<File, Integer>();
            File directory = new File(chooser.getSelectedFile().getAbsolutePath());

            List<File> files = getFileListing(directory);

            // print out all file names, in the the order of File.compareTo()
            for (File file : files) {
                System.out.println("Directory: " + file);
                getFileLineCount(result, file);
            }

            System.out.println("*****************************************");
            System.out.println("FILE NAME FOLLOWED BY LOC");
            System.out.println("*****************************************");

            for (Map.Entry<File, Integer> entry : result.entrySet()) {
                System.out.println(entry.getKey().getAbsolutePath() + " ==> " + entry.getValue());
            }
            System.out.println("*****************************************");
            System.out.println("SUM OF FILES SCANNED ==>" + "\t" + totalFileScannedCount);
            System.out.println("SUM OF ALL THE LINES ==>" + "\t" + totalLineCount);
        }

    }

    public static void getFileLineCount(final Map<File, Integer> result, final File directory)
            throws FileNotFoundException {
        File[] files = directory.listFiles(new FilenameFilter() {

            public boolean accept(final File directory, final String name) {
                if (name.endsWith(".java")) {
                    return true;
                } else {
                    return false;
                }
            }
        });
        for (File file : files) {
            if (file.isFile()) {
                totalFileScannedCount++;
                Scanner scanner = new Scanner(new FileReader(file));
                int lineCount = 0;
                try {
                    for (lineCount = 0; scanner.nextLine() != null; lineCount++) {
                        ;
                    }
                } catch (NoSuchElementException e) {
                    result.put(file, lineCount);
                    totalLineCount += lineCount;
                }
            }
        }

    }

    /**
     * Recursively walk a directory tree and return a List of all Files found;
     * the List is sorted using File.compareTo().
     * 
     * @param aStartingDir
     *            is a valid directory, which can be read.
     */
    static public List<File> getFileListing(final File aStartingDir) throws FileNotFoundException {
        validateDirectory(aStartingDir);
        List<File> result = getFileListingNoSort(aStartingDir);
        Collections.sort(result);
        return result;
    }

    // PRIVATE //
    static private List<File> getFileListingNoSort(final File aStartingDir) throws FileNotFoundException {
        List<File> result = new ArrayList<File>();
        File[] filesAndDirs = aStartingDir.listFiles();
        List<File> filesDirs = Arrays.asList(filesAndDirs);
        for (File file : filesDirs) {
            if (file.isDirectory()) {
                result.add(file);
            }
            if (!file.isFile()) {
                // must be a directory
                // recursive call!
                List<File> deeperList = getFileListingNoSort(file);
                result.addAll(deeperList);
            }
        }
        return result;
    }

    /**
     * Directory is valid if it exists, does not represent a file, and can be
     * read.
     */
    static private void validateDirectory(final File aDirectory) throws FileNotFoundException {
        if (aDirectory == null) {
            throw new IllegalArgumentException("Directory should not be null.");
        }
        if (!aDirectory.exists()) {
            throw new FileNotFoundException("Directory does not exist: " + aDirectory);
        }
        if (!aDirectory.isDirectory()) {
            throw new IllegalArgumentException("Is not a directory: " + aDirectory);
        }
        if (!aDirectory.canRead()) {
            throw new IllegalArgumentException("Directory cannot be read: " + aDirectory);
        }
    }
}