我需要证明用户输入路径
当用户不提供文件夹路径而是文件路径时。节目“倒下”。
我知道这是一个错误,但如何确保用户路径正确。
代码:
class PathAndWord {
final String path;
final String whatFind;
PathAndWord(String path, String whatFind) {
this.path = path;
this.whatFind = whatFind;
}
boolean isProperlyInitialized() {
return path != null && whatFind != null;
}
}
public void askUserPathAndWord() {
try {
tryToAskUserPathAndWord();
} catch (IOException | RuntimeException e) {
System.out.println("Wrong input!");
e.printStackTrace();
} catch (InterruptedException e) {
System.out.println("Interrupted.");
e.printStackTrace();
}
}
private void tryToAskUserPathAndWord() throws IOException, InterruptedException {
PathAndWord pathAndWord = readPathAndWord();
if (pathAndWord.isProperlyInitialized()) {
performScan(pathAndWord, "GameOver.tmp");
System.out.println("Thank you!");
} else {
System.out.println("You did not enter anything");
}
}
private PathAndWord readPathAndWord() throws IOException {
System.out.println("Please, enter a Path and Word (which you want to find):");
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
String path = readPath(bufferedReader);
String whatFind = readWord(bufferedReader);
return new PathAndWord(path, whatFind);
}
private String readPath(BufferedReader bufferedReader) throws IOException {
System.out.println("Please enter a Path:");
return bufferedReader.readLine();
}
private String readWord(BufferedReader bufferedReader) throws IOException {
System.out.println("Please enter a Word:");
return bufferedReader.readLine();
}
private void performScan(PathAndWord pathAndWord, String endOfWorkFileName) throws InterruptedException {
BlockingQueue<File> queue = new LinkedBlockingQueue<File>();
File endOfWorkFile = new File(endOfWorkFileName);
CountDownLatch latch = new CountDownLatch(2);
FolderScan folderScan = new FolderScan(pathAndWord.path, queue, latch,
endOfWorkFile);
FileScan fileScan = new FileScan(pathAndWord.whatFind, queue, latch,
endOfWorkFile);
Executor executor = Executors.newCachedThreadPool();
executor.execute(folderScan);
executor.execute(fileScan);
latch.await();
}
Qustions:
path
是否正确? path is wrong! Try again
的消息。 whatFind
是否也正确。 答案 0 :(得分:1)
private String readPath(BufferedReader bufferedReader) throws IOException {
boolean ok = false;
do {
System.out.println("Please enter a Path:");
File f = new File(bufferedReader.readLine());
if(f.exists() && f.isDirectory())
ok = true;
else
System.err.println("Doesn't exist or is not a folder.");
} while(!ok);
return f.getAbsolutePath();
}
编辑:此方法执行任务“从用户读取路径,该路径存在并且是目录”。如果用户键入无效路径(不存在或文件),则该方法会识别此情况,警告用户并再次询问他们......并一次又一次地 - 直到他们正确回答。
如果可以的话,在本地检查数据是一个很好的习惯。稍后调用该方法时,您可以确定它会返回,您期望的是什么。