为什么从浏览器下载的文件损坏了？

Question

I started creating a HTTP server application in java. when i tried to download a file from browser, the file size is incresed by 1 byte. and the file is not openning.

content-length: 12345 original size: 12345 downloaded size: 12346

                        ResHead resHead = new ResHead(StatusCode.OK);

                        String responseHeader = resHead
                                                .addContentTypeFromFile(file.getName())
                                                .addContentLength(file.length())
                                                .getResponseHeader();

                        os.write(responseHeader.getBytes());


                        FileInputStream fileInputStream = new FileInputStream(file);

                        BufferedInputStream in = 
                            new BufferedInputStream(fileInputStream);

                            OutputStream out = new BufferedOutputStream(os); // for writing

                        System.out.println(file.length());
                        byte[] buffer = new byte[1024 * 50];
                        int len = 0;
                        while ((len = in.read(buffer)) >= 0) {
                                out.write(buffer, 0, len);
                        }
                        fileInputStream.close();
                        os.flush();

Answer 1

I solved this problem by replacing "\n\r" to "\r\n" . Thank you.