ファイルで見つけたマルチスレッドを整理する必要があります。
ユーザー入力 where find(path) and what find(word);
最初のスレッドは、フォルダー内の .txt ファイルを検索し、結果をキューに追加します。キューにファイルがある場合 => 2 番目のスレッドが開始され、このファイルで検索する必要があるもの (単語) が検索されます。成功した場合は、このファイルのパスと、この単語がファイル内で遭遇する回数が表示されます。
しかし、私は持っていますNoSuchElementException.
出力：
Exception in thread "pool-1-thread-2" java.util.NoSuchElementException
at java.util.AbstractQueue.remove(AbstractQueue.java:117)
at task.FileScan.run(FileScan.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:722).
コード：
import java.util.concurrent.*;
import java.util.*;
import java.io.*;
class FolderScan implements Runnable {
private String path;
private BlockingQueue<File> queue;
private CountDownLatch latch;
private File endOfWorkFile;
FolderScan(String path, BlockingQueue<File> queue, CountDownLatch latch,
File endOfWorkFile) {
this.path = path;
this.queue = queue;
this.latch = latch;
this.endOfWorkFile = endOfWorkFile;
}
public FolderScan() {
// TODO Auto-generated constructor stub
}
@Override
public void run() {
findFiles(path);
queue.add(endOfWorkFile);
latch.countDown();
}
private void findFiles(String path) {
File root = new File(path);
File[] list = root.listFiles();
for (File currentFile : list) {
if (currentFile.isDirectory()) {
findFiles(currentFile.getAbsolutePath());
} else {
if (currentFile.getName().toLowerCase().endsWith((".txt"))) {
queue.add(currentFile);
}
}
}
}
}
public class FileScan implements Runnable {
private String whatFind;
private BlockingQueue<File> queue;
private CountDownLatch latch;
private File endOfWorkFile;
public FileScan(String whatFind, BlockingQueue<File> queue,
CountDownLatch latch, File endOfWorkFile) {
this.whatFind = whatFind;
this.queue = queue;
this.latch = latch;
this.endOfWorkFile = endOfWorkFile;
}
public FileScan() {
// TODO Auto-generated constructor stub
}
Set<String> words = new HashSet<String>();
int matches = 0;
@Override
public void run() {
while (true) {
File file = queue.remove();
if (file == endOfWorkFile) {
break;
}
scan(file);
}
latch.countDown();
}
private void scan(File file) {
Scanner scanner = null;
try {
scanner = new Scanner(file);
} catch (FileNotFoundException e) {
System.out.println("FileNotFoundException.");
e.printStackTrace();
}
while (scanner.hasNext()) {
String word = scanner.next();
words.add(word);
}
if (words.contains(this.whatFind)) {
// System.out.println("File:" + ((File) words).getAbsolutePath());
matches++;
}
@SuppressWarnings("unused")
String myStr = String.format("File: %s and the number of matches "
+ "is = %d", file.getAbsolutePath(), matches);
System.out.println("myStr");
matches = 0;
}
// ask user about input
public void askUserPathAndWord() {
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(System.in));
String path;
String whatFind;
BlockingQueue<File> queue = new LinkedBlockingQueue<File>();
try {
System.out.println("Please, enter a Path and Word"
+ "(which you want to find):");
System.out.println("Please enter a Path:");
path = bufferedReader.readLine();
System.out.println("Please enter a Word:");
whatFind = bufferedReader.readLine();
if (path != null && whatFind != null) {
File endOfWorkFile = new File("GameOver.tmp");
CountDownLatch latch = new CountDownLatch(2);
FolderScan folderScan = new FolderScan(path, queue, latch,
endOfWorkFile);
FileScan fileScan = new FileScan(whatFind, queue, latch,
endOfWorkFile);
Executor executor = Executors.newCachedThreadPool();
executor.execute(folderScan);
executor.execute(fileScan);
latch.await();
System.out.println("Thank you!");
} else {
System.out.println("You did not enter anything");
}
} catch (IOException | RuntimeException e) {
System.out.println("Wrong input!");
e.printStackTrace();
} catch (InterruptedException e) {
System.out.println("Interrupted.");
e.printStackTrace();
}
}
/**
* @param args
*/
public static void main(String[] args) {
new FileScan().askUserPathAndWord();
}
}
この問題をどのように解決できますか？
ありがとう、
ナザール。