为什么如此复杂，为什么要将完整图像读入内存？一个简单得多的解决方案：
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
sun.misc.BASE64Encoder enc = new sun.misc.BASE64Encoder();
enc.encode(new FileInputStream("/path/to/file.whatever"), response.getOutputStream());
}
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