java - 即使关闭 InputStream 也无法删除文件

Question

读取文件后，我试图删除它，但出现以下错误:

java.io.IOException: Unable to delete file test.zip at org.apache.commons.io.FileUtils.forceDelete (FileUtils.java:1390) at org.apache.commons.io.FileUtils.cleanDirectory (FileUtils.java:1044) at org.apache.commons.io.FileUtils.deleteDirectory (FileUtils.java:977)

这是我的代码。我一直小心地在 finally 子句中关闭 InputStream，然后才调用删除文件的方法，但即使这样我也只能在程序停止时删除它。

 InputStream is = null;
 try {
     is = new URL(filePath).openStream(); // filePath is a string containing the path to the file like http://test.com/file.zip
     BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"));
     String line;
     StringBuilder sb = new StringBuilder();

     while ((line = reader.readLine()) != null) {
         sb.append(line.trim());
     }

     String xml = sb.toString(); // this code is working, the result of the "xml" variable is as expected
  } catch (Exception e) {
      e.printStackTrace();
  } finally {
      try {
          if (is != null) {
              is.close();
          }
      } catch (Exception e) {
          e.printStackTrace();
      }

      removeFileAndFolder(absolutePath);
  }


private void removeFileAndFolder(String absolutePath) {
    new Thread(new Runnable() {
        @Override
        public void run() {
            try {
                String folder = getFolder(absolutePath); // this method just get the path to the folder, because I want to delete the entire folder, but the error occurs when deleting the file
                FileUtils.deleteDirectory(new File(folder));

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }).start();
}

经过一些测试，我发现我可以手动删除“is = new URL (filePath) .openStream ();”行之前的文件。在它之后，甚至在“is.close ();”行之后除非我停止程序，否则我无法手动删除文件。

Answer 1

我明白了。我正在通过 url (is = new URL(filePath).openStream();) 打开文件，并试图通过绝对路径删除它。我将其更改为“is = new FileInputStream(absoluteFilePath);”并且有效!