Servlet编写文件的最后包含二进制文件

Question

我有一个servlet让用户从服务器下载文件。原始文件是人类可读的，但下载的文件总是在文件末尾包含二进制内容。

HttpSession session = request.getSession(true);
String fileName = session.getAttribute("download").toString();
System.out.println("Download file " + fileName);
File file = new File(fileName);
FileInputStream fileIn = new FileInputStream(file);
response.setContentType("text/plain");
response.setHeader("Content-Disposition", "attachment;filename=" + file.getName());
ServletOutputStream out = response.getOutputStream();
byte[] bytes = new byte[BYTES_DOWNLOAD];
while (fileIn.read(bytes, 0, BYTES_DOWNLOAD) != -1) {
    out.write(bytes, 0, BYTES_DOWNLOAD);
}
out.flush();
out.close();

Answer 1

代码中的小bug:

byte[] bytes = new byte[BYTES_DOWNLOAD];
int count;
while ( (count = fileIn.read(bytes)) != -1) {
    out.write(bytes, 0, count);
}

Answer 2

你看到了什么二进制内容?可能是文件中的行结尾，如果有的话?