文件的分片下載顧名思義就是將文件分成一片一片，每次請求只下載一片，最后將文件進行整合下載，目的是為了防止文件大的情況,出現(xiàn)系統(tǒng)崩潰

SpringBoot后端實現(xiàn)文件的分片

@GetMapping("/download")
    public void download(HttpServletRequest request, HttpServletResponse response) throws IOException {
        String fileName = "1325.MP4";
//        String fileName = "SanGeng_Security_Project.zip";
        String filePath = "/Users/tianzhuang/Desktop/work/" + fileName;
        File file = new File(filePath);
        long fileSize = file.length();

        // Set content type and headers
        response.setContentType("application/octect-stream;charset=UTF-8");
        response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");
        response.setHeader("Accept-Ranges", "bytes");

        // Check if range header is present
        String rangeHeader = request.getHeader("Range");
        if (rangeHeader == null) {
            // Download entire file
            response.setHeader("Content-Length", String.valueOf(fileSize));
            InputStream in = new FileInputStream(file);
            OutputStream out = response.getOutputStream();
            byte[] buffer = new byte[BUFFER_SIZE];
            int bytesRead = -1;
            while ((bytesRead = in.read(buffer)) != -1) {
                out.write(buffer, 0, bytesRead);
            }
            in.close();
            out.close();
        } else {
            // Download partial content
            long start = 0;
            long end = fileSize - 1;
            String[] range = rangeHeader.split("=")[1].split("-");
            if (range.length == 1) {
                start = Long.parseLong(range[0]);
                end = fileSize - 1;
            } else {
                start = Long.parseLong(range[0]);
                end = Long.parseLong(range[1]);
            }
            long contentLength = end - start + 1;
            // 返回頭里存放每次讀取的開始和結(jié)束字節(jié)
            response.setHeader("Content-Length", String.valueOf(contentLength));
            response.setHeader("Content-Range", "bytes " + start + "-" + end + "/" + fileSize);
            InputStream in = new FileInputStream(file);
            OutputStream out = response.getOutputStream();
            // 跳到第start字節(jié)
            in.skip(start);
            byte[] buffer = new byte[BUFFER_SIZE];
            int bytesRead = -1;
            long bytesWritten = 0;
            while ((bytesRead = in.read(buffer)) != -1) {
                if (bytesWritten + bytesRead > contentLength) {
                    out.write(buffer, 0, (int) (contentLength - bytesWritten));
                    break;
                } else {
                    out.write(buffer, 0, bytesRead);
                    bytesWritten += bytesRead;
                }
            }
            in.close();
            out.close();
        }
    }

Vue前端代碼實現(xiàn)

<template>
  <div>
    <button @click="downloadFile">Download File</button>
  </div>
</template>

<script>
import axios from 'axios';

export default {
  methods: {
    async downloadFile() {
      const url = 'api/download';
      const chunkSize = 1024 * 1024 * 5; // 1MB
      let start = 0;
      let end = chunkSize - 1;
      let fileSize = 0;
      let chunks = [];

      // Get file size
      const response = await axios.head(url);
      fileSize = response.headers['content-length'];
      console.warn(`1111====${fileSize}`);
      // Calculate number of chunks
      const numChunks = Math.ceil(fileSize / chunkSize);
      console.warn(`222====${numChunks}`);
      if (fileSize < chunkSize) {
        end = fileSize - 1;
      }
      // Download chunks
      for (let i = 0; i < numChunks; i++) {
        const range = `bytes=${start}-${end}`;
        console.warn(`333====${range}`);
        const config = {
          headers: {
            Range: range
          },
          responseType: 'arraybuffer'
        };
        const response = await axios.get(url, config);
        chunks.push(response.data);
        start = end + 1;
        end = Math.min(end + chunkSize, fileSize - 1);
        // console.warn(`444===${start}===${end}`)
      }

      // Combine chunks into a single file
      const blob = new Blob(chunks);
      const link = document.createElement('a');
      link.href = window.URL.createObjectURL(blob);
      link.download = '1325.MP4';
      link.click();
    },
    downloadFile2() {

    }

  }
};
</script>

下邊是效果

image.png

勿噴，希望大佬多多指教