java - java中的资源没有被释放

Question

所以，我有一个读取文件数据的函数，在本例中是图像大小。但完成后似乎无法正确释放文件。之后我无法移动这些文件。如果我不调用这个函数，一切都会正常，但如果我这样做，我总是会得到“文件正在使用..等等等等”

private void setMoveType() {
    ImageInputStream in = null;
    try {
        in = ImageIO.createImageInputStream(new FileInputStream(file.toString()));
        try {
            final Iterator<ImageReader> readers = ImageIO.getImageReaders(in);
            if(readers.hasNext()) {
                ImageReader reader = readers.next();
                try {
                    reader.setInput(in);
                    try {
                        moveType = Helper.getMoveType(new Dimension(reader.getWidth(0), reader.getHeight(0)));
                    } catch (IOException e) {
                        System.err.println("IOException: " + e.getMessage());
                        return;
                    }
                } catch(Exception e) {
                    System.err.println("ReaderException: " + e.getMessage());
                } finally {
                    reader.dispose();
                }
            }
        } catch(Exception e) {
            System.err.println("MoveTypeSetException: " + e.getMessage());
        }
    } catch (IOException e) {
        System.err.print("IOException: failure while creating image input stream");
        System.err.println(" -> createImageInputStream Error for file: " + file.getFileName());
        return;
    } finally {
        if(in != null) {
            try {
                in.close();
            } catch (IOException e) {
                System.err.println("IOException: " + e.getMessage());
                return;
            }
        }
    }
}

编辑:ImageInputStream 未正确关闭

EDIT2:FileInputStream 未关闭

Answer 1

该流也应该关闭:

new FileInputStream(file.toString())