시스템 종료 후 File 삭제

1. 파일 삭제

 - 시스템이 종료될 때 파일 삭제하고 싶음

2. Thread를 생성해서 처리함.

 - jdk1.8 미만

Runtime.getRuntime().addShutdownHook(new Thread() {

   @Override
   public void run() {
      
      new File("").delete(); //File Delete Code
   }
});

 - jdk 1.8 이상

Runtime.getRuntime().addShutdownHook(new Thread(() -> {
      new File("").delete(); //File Delete Code
}));

3. Apache Commons-io를 사용

 - 코드 샘플

try {
   FileUtils.forceDeleteOnExit(new File("fileName"));
} catch (IOException e) {
   e.printStackTrace();
}

 - 메소드

/**
 * Schedules a file to be deleted when JVM exits.
 * If file is directory delete it and all sub-directories.
 *
 * @param file file or directory to delete, must not be {@code null}
 * @throws NullPointerException if the file is {@code null}
 * @throws IOException          in case deletion is unsuccessful
 */
public static void forceDeleteOnExit(final File file) throws IOException {
    if (file.isDirectory()) {
        deleteDirectoryOnExit(file);
    } else {
        file.deleteOnExit();
    }
}