视频进行分片上传后端Java代码

以下是一个基于Spring Boot框架的视频分片上传后端Java代码示例：

1. 定义文件分片上传接口

@RestController
@RequestMapping("/upload")
public class UploadController {

    // 定义文件上传路径
    private final String filePath = "D:/uploads/";

    @PostMapping("/video")
    public String uploadVideo(@RequestParam("file") MultipartFile file,
                              @RequestParam("fileName") String fileName,
                              @RequestParam("chunk") Integer chunk,
                              @RequestParam("chunks") Integer chunks) throws IOException {
        // 生成上传文件的路径和名称
        String uploadPath = filePath + fileName + "/";
        String uploadFilePath = uploadPath + chunk;
        File uploadFile = new File(uploadFilePath);

        // 判断上传文件夹是否存在，不存在则创建
        if (!uploadFile.getParentFile().exists()) {
            uploadFile.getParentFile().mkdirs();
        }

        // 将分片文件写入磁盘
        file.transferTo(uploadFile);

        // 判断是否已上传完所有分片文件
        if (chunk == chunks - 1) {
            // 合并分片文件
            mergeChunks(uploadPath, fileName, chunks);
        }

        return "success";
    }

    // 合并分片文件
    private void mergeChunks(String uploadPath, String fileName, int chunks) throws IOException {
        // 生成合并后文件的路径和名称
        String mergeFilePath = filePath + fileName;
        File mergeFile = new File(mergeFilePath);

        // 创建合并后的文件
        if (!mergeFile.exists()) {
            mergeFile.createNewFile();
        }

        // 将分片文件合并为一个文件
        try (FileOutputStream outputStream = new FileOutputStream(mergeFile, true)) {
            for (int i = 0; i < chunks; i++) {
                File chunkFile = new File(uploadPath + i);
                byte[] bytes = new byte[(int) chunkFile.length()];
                try (FileInputStream inputStream = new FileInputStream(chunkFile)) {
                    inputStream.read(bytes);
                    outputStream.write(bytes);
                }
                chunkFile.delete();
            }
        }
    }
}

2. 前端代码调用分片上传接口

function uploadVideo() {
  var file = document.getElementById("file").files[0];
  var fileName = file.name;
  var fileSize = file.size;
  var chunkSize = 1024 * 1024; // 每片文件大小（1MB）
  var chunks = Math.ceil(fileSize / chunkSize); // 分片数量

  // 逐一上传分片文件
  for (var i = 0; i < chunks; i++) {
    var start = i * chunkSize;
    var end = Math.min(fileSize, start + chunkSize);
    var blob = file.slice(start, end);
    var formData = new FormData();
    formData.append("file", blob);
    formData.append("fileName", fileName);
    formData.append("chunk", i);
    formData.append("chunks", chunks);

    // 调用后端接口上传分片文件
    $.ajax({
      url: "/upload/video",
      type: "POST",
      data: formData,
      processData: false,
      contentType: false,
      async: false,
      success: function (data) {
        console.log("上传分片" + i + "成功");
      },
      error: function (error) {
        console.log("上传分片" + i + "失败：" + error);
      },
    });
  }
}

以上代码仅供参考，具体实现方式可根据实际需求进行调整。