Java FileOutputStream 创建文件未解锁

Question

目前我的代码中遇到 FileOutputStream 问题，使用 FileOutputStream 在磁盘中创建文件。创建文件后，无法从其位置打开、删除或移动文件，已经收到错误消息被其他用户锁定当网络服务器停止时，它可以正常工作。我该如何解决这个问题。

private void writeToFile(InputStream uploadedInputStream,
            String uploadedFileLocation) {

            try {
                OutputStream out = new FileOutputStream(new File(
                        uploadedFileLocation));
                int read = 0;
                byte[] bytes = new byte[1024];

                out = new FileOutputStream(new File(uploadedFileLocation));
                while ((read = uploadedInputStream.read(bytes)) != -1) {
                    out.write(bytes, 0, read);
                }
                out.flush();
                out.close();

            } catch (IOException e) {

                e.printStackTrace();
            }

        }

Answer 1

您正在创建两个 FileOutputStream 实例，并将它们都分配给 out，但只关闭一个。

删除第二个 out = new FileOutputStream(new File(uploadedFileLocation));。

此外，您应该考虑使用 try-with-resources block

private void writeToFile(InputStream uploadedInputStream,
    String uploadedFileLocation) {

    try (OutputStream out = new FileOutputStream(new File(uploadedFileLocation))) {
        int read = 0;
        byte[] bytes = new byte[1024];

        while ((read = uploadedInputStream.read(bytes)) != -1) {
            out.write(bytes, 0, read);
        }

    } catch (IOException e) {

        e.printStackTrace();
    }

}

或finally block 以确保流关闭

private void writeToFile(InputStream uploadedInputStream,
    String uploadedFileLocation) {

    OutputStream out = null;
    try {
        out = new FileOutputStream(new File(uploadedFileLocation))
        int read = 0;
        byte[] bytes = new byte[1024];

        while ((read = uploadedInputStream.read(bytes)) != -1) {
            out.write(bytes, 0, read);
        }

    } catch (IOException e) {

        e.printStackTrace();
    } finally {
        if (out != null) {
            try {
                out.close();
            } catch (IOException exp) {            
            }
        }
    }

}

参见The try-with-resources Statement了解更多详情