我开发了一个应用程序，它读取java项目中java包中有多少文件，并计算这些单独文件中的代码行，例如在java项目中，如果有2个包有4个单独的文件那么读取的总文件数为4，如果这4个文件在每个文件中有10行代码，则4 * 10在整个项目中共有40行代码...下面是我的代码
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);
//totalFileScannedCount += result.size(); //saral
}
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()) {
Scanner scanner = new Scanner(new FileReader(file));
int lineCount = 0;
totalFileScannedCount ++; //saral
try {
for (lineCount = 0; scanner.nextLine() != null; ) {
while (scanner.hasNextLine()) {
String line = scanner.nextLine().trim();
if (!line.isEmpty()) {
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);
}
}
但问题是它在计算单个文件的代码行时也计算了空格行，它不应该，请告诉我在程序中需要做哪些修改，以便它不应该算白在计算单个文件的代码行时使用空格。
我想到的想法只是将读取字符串与“”进行比较，如果不等于“”（空）就像if（！readString.trim（）。equals（“”））lineCount ++ 请告知此
答案 0 :(得分：2)
建议：
hasNextLine()方法，您应该使用它。我会用它作为while循环的条件。nextLine()来获取while循环内的行。trim()。我仍然没有在最新的代码更新中看到您的尝试！ trim()也没有区别：调用它的字符串不变，但是 方法改变了返回的 ，实际上已经修剪了。 isEmpty()方法，您应该在修剪String后调用它。所以不要这样做：
try {
for (lineCount = 0; scanner.nextLine() != null; ) {
if(!readString.trim().equals("")) lineCount++; // updated one
}
} catch (NoSuchElementException e) {
result.put(file, lineCount);
totalLineCount += lineCount;
}
取而代之的是：
int lineCount = 0;
while (scanner.hasNextLine()) {
String line = scanner.nextLine().trim();
if (!line.isEmpty()) {
lineCount++;
}
}