問題描述

Spring Boot API 定義 GET 請求 API ， 返回視訊流。前端通過 <video> 標籤載入並播放視訊，效果是必須等整個視訊資源全部載入到瀏覽器才能播放，而且 <video> 標籤預設的進度條無法控制視訊的播放。最終希望的效果是視訊流邊載入邊播放，且播放器的控制正常使用。

解決方法

Spring Framework 檔案請求處理

import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.resource.ResourceHttpRequestHandler;

import javax.servlet.http.HttpServletRequest;
import java.nio.file.Path;

@Component
public class NonStaticResourceHttpRequestHandler extends ResourceHttpRequestHandler {

  public final static String ATTR_FILE = "NON-STATIC-FILE";

  @Override
  protected Resource getResource(HttpServletRequest request) {
    final Path filePath = (Path) request.getAttribute(ATTR_FILE);
    return new FileSystemResource(filePath);
  }

}

Controller 層

@RestController
@AllArgsConstructor
public class FileRestController {

  private final NonStaticResourceHttpRequestHandler nonStaticResourceHttpRequestHandler;

  /**
   * 預覽視訊檔案,支援 byte-range 請求
   */
  @GetMapping("/video")
  public void videoPreview(HttpServletRequest request,HttpServletResponse response) throws Exception {
    String path = request.getParameter("path");
    Path filePath = Paths.get(path);
    if (Files.exists(filePath)) {
      String mimeType = Files.probeContentType(filePath);
      if (!StringUtils.isEmpty(mimeType)) {
        response.setContentType(mimeType);
      }
      request.setAttribute(NonStaticResourceHttpRequestHandler.ATTR_FILE,filePath);
      nonStaticResourceHttpRequestHandler.handleRequest(request,response);
    } else {
      response.setStatus(HttpServletResponse.SC_NOT_FOUND);
      response.setCharacterEncoding(StandardCharsets.UTF_8.toString());
    }
  }

}

相關資料

How do I return a video with Spring MVC so that it can be navigated using the html5 tag?

https://stackoverflow.com/questions/3303029/http-range-header

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