File io java.nio.file.Files.delete(路径)-使用SimpleFileVisitor递归删除目录时偶尔出现故障
正在尝试对从中获取的递归删除方法中偶尔出现的File io java.nio.file.Files.delete(路径)-使用SimpleFileVisitor递归删除目录时偶尔出现故障,file-io,java-7,nio,java-io,File Io,Java 7,Nio,Java Io,正在尝试对从中获取的递归删除方法中偶尔出现的java.nio.file.DirectoryNotEmptyException进行故障排除 代码(归功于@TrevorRobinson): 打印(每20/40次迭代一次): 22:03:34.190[http-bio-8080-exec-47]警告g.u.d.m.server.servlets.Controller$1-删除batt 22:03:34.192[http-bio-8080-exec-47]警告g.u.d.m.server.servlet
java.nio.file.DirectoryNotEmptyException
进行故障排除
代码(归功于@TrevorRobinson):
打印(每20/40次迭代一次):
22:03:34.190[http-bio-8080-exec-47]警告g.u.d.m.server.servlets.Controller$1-删除batt
22:03:34.192[http-bio-8080-exec-47]警告g.u.d.m.server.servlets.Controller$1-已删除batt
22:03:34.192[http-bio-8080-exec-47]警告g.u.d.m.server.servlets.Controller$1-删除wifi
22:03:34.193[http-bio-8080-exec-47]警告g.u.d.m.server.servlets.Controller$1-已删除wifi
22:03:34.196[http-bio-8080-exec-47]错误g.u.d.m.s.s.DataCollectionServlet-无法删除文件夹C:\yada\。仍然包含:C:\yada\dir\wifi
java.nio.file.DirectoryNotEmptyException:C:\yada\dir
在sun.nio.fs.WindowsFileSystemProvider.implDelete(WindowsFileSystemProvider.java:265)~[na:1.7.0\u 45]
在sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:103)~[na:1.7.045]
在java.nio.file.Files.delete(Files.java:1077)~[na:1.7.0_45]
在gr.uoa.di.monitoring.server.servlets.Controller$1.postVisitDirectory(Controller.java:128)~[Controller$1.class:na]
在gr.uoa.di.monitoring.server.servlets.Controller$1.postVisitDirectory(Controller.java:1)~[Controller$1.class:na]
在java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:224)~[na:1.7.045]
在java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:199)~[na:1.7.045]
在java.nio.file.FileTreeWalker.walk(FileTreeWalker.java:69)~[na:1.7.045]
在java.nio.file.Files.walkFileTree(Files.java:2600)~[na:1.7.045]
在java.nio.file.Files.walkFileTree(Files.java:2633)~[na:1.7.0\u 45]
在gr.uoa.di.monitoring.server.servlets.Controller.removecursive(Controller.java:96)~[Controller.class:na]
在gr.uoa.di.monitoring.server.servlets.DataCollectionServlet.doPost(DataCollectionServlet.java:153)~[DataCollectionServlet.class:na]
位于javax.servlet.http.HttpServlet.service(HttpServlet.java:641)[ServletAPI.jar:na]
在javax.servlet.http.HttpServlet.service(HttpServlet.java:722)[ServletAPI.jar:na]
在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)[catalina.jar:7.0.32]
在org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)[catalina.jar:7.0.32]
在org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)[catalina.jar:7.0.32]
在org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)[catalina.jar:7.0.32]
在org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)[catalina.jar:7.0.32]
在org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)[catalina.jar:7.0.32]
在org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)[catalina.jar:7.0.32]
在org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)[catalina.jar:7.0.32]
在org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)[catalina.jar:7.0.32]
在org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)[catalina.jar:7.0.32]
在org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)[tomcat coyote.jar:7.0.32]
在org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)[tomcat coyote.jar:7.0.32]
在org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)[tomcat coyote.jar:7.0.32]
位于java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)[na:1.7.0\u 45]
在java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)[na:1.7.0_45]
在java.lang.Thread.run(Thread.java:744)[na:1.7.0_45]
请注意,wifi
被报告为已删除-更奇怪的是,有时我会收到:
无法删除文件夹C:\yada。仍然包含:C:\yada\dir
java.nio.file.DirectoryNotEmptyException:C:\yada\dir
我倾向于得出这样的结论:有时候删除会花费太长的时间——换句话说,问题是java.nio.file.Files.delete(Path)
不会阻塞(因此C:\yada\dir在它的时间到来时仍然包含文件,有时在我统计它时会被删除)。那么我该如何解决这个问题呢
也:抛出是否需要java.nio.file.Files.delete(路径)
?国家:
在某些操作系统上,当文件被此Java虚拟机或其他程序打开并使用时,可能无法删除该文件
在这种情况下,似乎不需要抛出异常。抛出是否需要
java.nio.file.Files.delete(路径)
。当发生此异常时,捕获它并引发您自己的指定文件的异常
try {
Files.delete(file);
} catch (DirectoryNotEmptyException e) {
throw new MySpecificException(file.getFileName());
}
class MySpecificException extends Exception {
public MySpecificException() { }
public MySpecificException(string filename) {
super(filename);
}
}
可以使用e.getMessage()获取文件名代码>
我假设Files.delete()
遇到无法删除的文件时,会继续删除目录中的文件。如果是这种情况,我的方法仍然有效:只需返回目录中所有文件的列表,而不是目录的文件名。它应该只包含不能删除的文件,而您仍然拥有您的解决方案。以上我的评论的扩展
当Java在做某事时遇到问题时,它会抛出一个错误。与所有其他类型一样,异常可以从继承。API将指定每个方法抛出哪些选中的异常。java.io
和java中的方法。
try {
removeRecursive(Paths.get(unzipDirPath));
} catch (IOException e) {
String msg = "Failed to delete folder " + unzipDirPath;
if (e instanceof java.nio.file.DirectoryNotEmptyException) {
msg += ". Still contains : ";
final File[] listFiles = Paths.get(unzipDirPath).toFile().listFiles();
if (listFiles != null) for (File file : listFiles) {
msg += file.getAbsolutePath() + "\n";
}
}
log.error(msg, e);
}
try {
Files.delete(file);
} catch (DirectoryNotEmptyException e) {
throw new MySpecificException(file.getFileName());
}
class MySpecificException extends Exception {
public MySpecificException() { }
public MySpecificException(string filename) {
super(filename);
}
}
@Override
public FileVisitResult visitFileFailed(Path file, IOException exc) throws IOException {
//You don't need to try to delete the file again since this method was called
//because the deletion failed. Instead...
if (exc instanceof NoSuchFileException) {
System.out.println("Could not find the file: " + file);
} else if (exc instanceof DirectoryNotEmptyException) {
System.out.println("The directory [+ " file + "] was not empty.");
} else {
System.out.println("Could not delete file [" + file
+ "]. There was a problem communicating with the file system");
}
return FileVisitResult.CONTINUE;
}
Files.list(Path)
private boolean isDeleted(Path dir) throws IOException {
boolean deleted = false;
try {
Files.delete(dir);
deleted = true;
} catch (DirectoryNotEmptyException e) {
// happens sometimes if Windows is too slow to remove children of a directory
deleted = false;
}
return deleted;
}
public FileVisitResult postVisitDirectory(Path dir, IOException e) throws IOException {
if (e == null) {
int maxTries = 5;
int count = 0;
boolean deleted = false;
do {
if ((deleted = this.isDeleted(dir))) {
break;
} else {
// wait a bit and try again
count++;
try {
Thread.sleep(1);
} catch (InterruptedException e1) {
Thread.currentThread().interrupt();
break;
}
}
} while (count < maxTries);
// gone?
if (!deleted) {
throw new DirectoryNotEmptyException(dir.toString());
}
// go ahead
return FileVisitResult.CONTINUE;
}
throw e;
}
/**
* @param dir The directory to list.
* @return A list of files and directories in dir.
* @throws IOException If encountered.
*/
public static List<Path> getList(Path dir) throws IOException {
try (Stream<Path> s = Files.list(dir)) {
return s.collect(Collectors.toList());
}
}