Spring圖片、文件資源斷點續傳，視頻流播放

import org.apache.commons.io.FilenameUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.support.ResourceRegion;
import org.springframework.http.HttpRange;
import org.springframework.util.StreamUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.List;

public final class RangeResourceUtil {

    private RangeResourceUtil() {

    }

    public static void writeRangeResource(HttpServletRequest request, HttpServletResponse response, File file) throws IOException {
        String range = request.getHeader("Range");
        if (StringUtils.isNotEmpty(range)) {
            //斷點續傳
            ResourceRegion region = getResourceRegion(file, range);
            long start = region.getPosition();
            long end = start + region.getCount() - 1;
            Long resourceLength = region.getResource().contentLength();
            end = Math.min(end, resourceLength - 1);
            long rangeLength = end - start + 1;

            response.setStatus(206);
            response.addHeader("Accept-Ranges", "bytes");
            response.addHeader("Content-Range", String.format("bytes %s-%s/%s", start, end, resourceLength));
            response.setContentLengthLong(rangeLength);
            try (OutputStream outputStream = response.getOutputStream()) {
                try (InputStream inputStream = new BufferedInputStream(new FileInputStream(file))) {
                    StreamUtils.copyRange(inputStream, outputStream, start, end);
                }
            }
        } else {
            response.setStatus(200);
            response.addHeader("Accept-Ranges", "bytes");
            response.setContentLengthLong(file.length());
            try (OutputStream outputStream = response.getOutputStream()) {
                try (InputStream inputStream = new BufferedInputStream(new FileInputStream(file))) {
                    StreamUtils.copy(inputStream, outputStream);
                }
            }
        }
    }

    private static ResourceRegion getResourceRegion(File file, String range) {
        List<HttpRange> httpRanges = HttpRange.parseRanges(range);
        if (httpRanges.isEmpty()) {
            ResourceRegion region = new ResourceRegion(new FileSystemResource(file), 0, file.length());
            return region;
        }
        ResourceRegion region = httpRanges.get(0).toResourceRegion(new FileSystemResource(file));
        return region;
    }
}