HttpServletResponse 返回图片

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@GetMapping("/image/foo.jpg")
public void enrollRegPhoto(HttpServletResponse response) {
InputStream in = null;
OutputStream out = null;
try {
response.setContentType("image/png"); // 如果是 jpg 则为 image/jpeg,svg 为 image/svg+xml 等
in = new FileInputStream("/imageDir/foo.jpg");
out = response.getOutputStream();
IOUtils.copy(in, out);
} catch (Exception ex) {
logger.warn(ex.getMessage());
} finally {
IOUtils.closeQuietly(in);
IOUtils.closeQuietly(out);
}
}