java - 下载图像时 FileOutputStream 崩溃并出现 "open failed: EISDIR (Is a directory)"错误

Question

我正在尝试从互联网上下载一个 iamge，这是代码:

try {
                String imgURL = c.imgURL;
                String imgPATH = c.imgPATH;
                URL url = new URL(imgURL);
                URLConnection conexion = url.openConnection();
                conexion.connect();
                int lenghtOfFile = conexion.getContentLength();
                try {
                    File f = new File(imgPATH);
                    f.mkdirs();

                    BufferedInputStream input = new BufferedInputStream(url.openStream());
                    BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream(imgPATH), 8192); // CRASH HERE

                    byte data[] = new byte[8192];
                    long total = 0;
                    int count = 0;
                    int updateUILimiter = 0;
                    while ((count = input.read(data)) != -1) {
                        total += count;

                        if (updateUILimiter == 20)
                            // publishProgress((int) (total * 100 / lenghtOfFile));
                            updateUILimiter = 0;
                        else
                            updateUILimiter++;

                        output.write(data, 0, count);

                        if (isCancelled()) {
                            output.flush();
                            output.close();
                            input.close();
                            return null;
                        }

                    }
                    output.flush();
                    output.close();
                    input.close();
                } catch (Exception e) {
                    c.imgPATH = "";
                    return null;
                }


            } catch (Exception e) {
                c.imgPATH = "";
                return null;
            }

这里是错误信息:

/mnt/sdcard/tmp/3.png: open failed: EISDIR (Is a directory)

这是为什么？

“/mnt/sdcard/tmp/”存在。

Answer 1

3.png 是一个目录，因为你通过调用 f.mkdirs(); 来实现它。尝试 f.getParentFile().mkdirs() 代替。来自 documentation :

Creates the directory named by this abstract pathname, including any necessary but nonexistent parent directories. Note that if this operation fails it may have succeeded in creating some of the necessary parent directories.

(强调我的)。换句话说，包含在 File 实例 f 中的整个路径被视为目录名称，直到并包括最后一部分(3.png 在示例输出中)。