关于流的关闭注意事项

private void readTheFile() throws IOException {
  Path path = Paths.get(this.fileName);
  BufferedReader reader = Files.newBufferedReader(path, this.charset);
  // ...
  reader.close();  // Noncompliant
  // ...
  Files.lines("input.txt").forEach(System.out::println); // Noncompliant: The stream needs to be closed
}

这里流的关闭有问题，看似关闭了，但是在代码的执行过程中可能会出现报错之类的情况，导致流未能关闭，所以要在finally里面关闭

private void doSomething() {
  OutputStream stream = null;
  try {
    stream = new FileOutputStream("myfile.txt");
    for (String property : propertyList) {
      // ...
    }
  } catch (Exception e) {
    // ...
  } finally {
    stream.close();
  }
}

try-with-resources也可以，但是我不会用或者说用的不熟练。