//計(jì)算文件的md5值
function computeMd5(file, uploadFile) {
  return new Promise((resolve, reject) => {
    //分片讀取并計(jì)算md5
    const chunkTotal = 100; //分片數(shù)
    const chunkSize = Math.ceil(file.size / chunkTotal);
    const fileReader = new FileReader();
    const md5 = new SparkMD5();
    let index = 0;
    const loadFile = (uploadFile) => {
      uploadFile.parsePercentage.value = parseInt((index / file.size) * 100);
      const slice = file.slice(index, index + chunkSize);
      fileReader.readAsBinaryString(slice);
    };
    loadFile(uploadFile);
    fileReader.onload = (e) => {
      md5.appendBinary(e.target.result);
      if (index < file.size) {
        index += chunkSize;
        loadFile(uploadFile);
      } else {
        // md5.end() 就是文件md5碼
        resolve(md5.end());
      }
    };
  });
}
//檢查文件是否存在
function checkFile(md5) {
  return request({
    url: "/check",
    method: "get",
    params: {
      md5: md5,
    },
  });
}
//文件上傳之前,el-upload自動(dòng)觸發(fā)
async function beforeUpload(file) {
  console.log("2.上傳文件之前");
  var uploadFile = {};
  uploadFile.name = file.name;
  uploadFile.size = file.size;
  uploadFile.parsePercentage = ref(0);
  uploadFile.uploadPercentage = ref(0);
  uploadFile.uploadSpeed = "0 M/s";
  uploadFile.chunkList = null;
  uploadFile.file = file;
  uploadFile.uploadingStop = false;
  uploadFileList.value.push(uploadFile);
  var md5 = await computeMd5(file, uploadFile);//async 和 await配可以實(shí)現(xiàn)等待異步函數(shù)計(jì)算完成
  uploadFile.md5 = md5;
  var res = await checkFile(md5);  //上傳服務(wù)器檢查，以確認(rèn)是否秒傳
  var data = res.data.data;
  if (!data.isUploaded) {
    uploadFile.chunkList = data.chunkList;
    uploadFile.needUpload = true;
  } else {
    uploadFile.needUpload = false;
    uploadFile.uploadPercentage.value = 100;
    console.log("文件已秒傳");
    ElMessage({
      showClose: true,
      message: "文件已秒傳",
      type: "warning",
    });
  }
}

<template>
  <div class="main">
    <!-- 文件上傳按鈕 -->
    <el-upload
      action="#"
      :http-request="upload"
      :before-upload="beforeUpload"
      :show-file-list="false"
    >
      <el-button type="primary">選擇上傳文件</el-button>
    </el-upload>
    <el-divider content-position="left">上傳列表</el-divider>
    <!-- 正在上傳的文件列表 -->
    <div class="uploading" v-for="uploadFile in uploadFileList">
      <span class="fileName">{{ uploadFile.name }}</span>
      <span class="fileSize">{{ formatSize(uploadFile.size) }}</span>
      <div class="parse">
        <span>解析進(jìn)度： </span>
        <el-progress
          :text-inside="true"
          :stroke-width="16"
          :percentage="uploadFile.parsePercentage"
        >
        </el-progress>
      </div>
      <div class="progress">
        <span>上傳進(jìn)度：</span>
        <el-progress
          :text-inside="true"
          :stroke-width="16"
          :percentage="uploadFile.uploadPercentage"
        >
        </el-progress>
        <span
          v-if="
            (uploadFile.uploadPercentage > 0) &
            (uploadFile.uploadPercentage < 100)
          "
        >
          <span class="uploadSpeed">{{ uploadFile.uploadSpeed }}</span>
          <el-button circle link @click="changeUploadingStop(uploadFile)">
            <el-icon size="20" v-if="uploadFile.uploadingStop == false"
              ><VideoPause
            /></el-icon>
            <el-icon size="20" v-else><VideoPlay /></el-icon>
          </el-button>
        </span>
      </div>
    </div>
  </div>
</template>
<script setup>
import emitter from "../utils/eventBus.js";
import { ElMessage } from "element-plus";
import SparkMD5 from "spark-md5";
import { VideoPause, VideoPlay } from "@element-plus/icons-vue";
import { ref, reactive, getCurrentInstance, nextTick } from "vue";
const { appContext } = getCurrentInstance();
const request = appContext.config.globalProperties.request;
var uploadFileList = ref([]);
//換算文件的大小單位
function formatSize(size) {
  //size的單位大小k
  var unit;
  var units = [" B", " K", " M", " G"];
  var pointLength = 2;
  while ((unit = units.shift()) && size > 1024) {
    size = size / 1024;
  }
  return (
    (unit === "B"
      ? size
      : size.toFixed(pointLength === undefined ? 2 : pointLength)) + unit
  );
}
//計(jì)算文件的md5值
function computeMd5(file, uploadFile) {
  return new Promise((resolve, reject) => {
    //分片讀取并計(jì)算md5
    const chunkTotal = 100; //分片數(shù)
    const chunkSize = Math.ceil(file.size / chunkTotal);
    const fileReader = new FileReader();
    const md5 = new SparkMD5();
    let index = 0;
    const loadFile = (uploadFile) => {
      uploadFile.parsePercentage.value = parseInt((index / file.size) * 100);
      const slice = file.slice(index, index + chunkSize);
      fileReader.readAsBinaryString(slice);
    };
    loadFile(uploadFile);
    fileReader.onload = (e) => {
      md5.appendBinary(e.target.result);
      if (index < file.size) {
        index += chunkSize;
        loadFile(uploadFile);
      } else {
        // md5.end() 就是文件md5碼
        resolve(md5.end());
      }
    };
  });
}
//檢查文件是否存在
function checkFile(md5) {
  return request({
    url: "/check",
    method: "get",
    params: {
      md5: md5,
    },
  });
}
//文件上傳之前,el-upload自動(dòng)觸發(fā)
async function beforeUpload(file) {
  console.log("2.上傳文件之前");
  var uploadFile = {};
  uploadFile.name = file.name;
  uploadFile.size = file.size;
  uploadFile.parsePercentage = ref(0);
  uploadFile.uploadPercentage = ref(0);
  uploadFile.uploadSpeed = "0 M/s";
  uploadFile.chunkList = null;
  uploadFile.file = file;
  uploadFile.uploadingStop = false;
  uploadFileList.value.push(uploadFile);
  var md5 = await computeMd5(file, uploadFile);//async 和 await配可以實(shí)現(xiàn)等待異步函數(shù)計(jì)算完成
  uploadFile.md5 = md5;
  var res = await checkFile(md5);  //上傳服務(wù)器檢查，以確認(rèn)是否秒傳
  var data = res.data.data;
  if (!data.isUploaded) {
    uploadFile.chunkList = data.chunkList;
    uploadFile.needUpload = true;
  } else {
    uploadFile.needUpload = false;
    uploadFile.uploadPercentage.value = 100;
    console.log("文件已秒傳");
    ElMessage({
      showClose: true,
      message: "文件已秒傳",
      type: "warning",
    });
  }
}
//點(diǎn)擊暫停或開始上傳
function changeUploadingStop(uploadFile) {
  uploadFile.uploadingStop = !uploadFile.uploadingStop;
  if (!uploadFile.uploadingStop) {
    uploadChunk(uploadFile.file, 1, uploadFile);
  }
}
//上傳文件,替換el-upload的action
function upload(xhrData) {
  var uploadFile = null;
  for (var i = 0; i < uploadFileList.value.length; i++) {
    if (
      (xhrData.file.name == uploadFileList.value[i].name) &
      (xhrData.file.size == uploadFileList.value[i].size)
    ) {
      uploadFile = uploadFileList.value[i];
      break;
    }
  }
  if (uploadFile.needUpload) {
    console.log("3.上傳文件");
    // 分片上傳文件
    // 確定分片的大小
    uploadChunk(xhrData.file, 1, uploadFile);
  }
}
//上傳文件分片
function uploadChunk(file, index, uploadFile) {
  var chunkSize = 1024 * 1024 * 10; //10mb
  var chunkTotal = Math.ceil(file.size / chunkSize);
  if (index <= chunkTotal) {
    // 根據(jù)是否暫停，確定是否繼續(xù)上傳
    // console.log("4.上傳分片");
    var startTime = new Date().valueOf();
    var exit = uploadFile.chunkList.includes(index);
    // console.log("是否存在",exit);
    if (!exit) {
      //    console.log("3.3上傳文件",uploadingStop);
      if (!uploadFile.uploadingStop) {
        // 分片上傳，同時(shí)計(jì)算進(jìn)度條和上傳速度
        // 已經(jīng)上傳的不在上傳、
        // 上傳完成后提示，上傳成功
        // console.log("上傳分片1",index);
        var form = new FormData();
        var start = (index - 1) * chunkSize;
        let end =
          index * chunkSize >= file.size ? file.size : index * chunkSize;
        let chunk = file.slice(start, end);
        //  downloadBlob(chunk,file)
        //  console.log("chunk",chunk);
        form.append("chunk", chunk);
        form.append("index", index);
        form.append("chunkTotal", chunkTotal);
        form.append("chunkSize", chunkSize);
        form.append("md5", uploadFile.md5);
        form.append("fileSize", file.size);
        form.append("fileName", file.name);
        // console.log("上傳分片", index);
        request({
          url: "/upload/chunk",
          method: "post",
          data: form,
        }).then((res) => {
          var endTime = new Date().valueOf();
          var timeDif = (endTime - startTime) / 1000;
          // console.log("上傳文件大小",formatSize(chunkSize));
          // console.log("耗時(shí)",timeDif);
          // console.log("then",index);
          // uploadSpeed = (chunkSize/(1024*1024))  / timeDif +" M / s"
          uploadFile.uploadSpeed = (10 / timeDif).toFixed(1) + " M/s";
          // console.log(res.data.data);
          //  console.log("f2",uploadFile);
          uploadFile.chunkList.push(index);
          //  console.log("f3",uploadFile);
          uploadFile.uploadPercentage = parseInt(
            (uploadFile.chunkList.length / chunkTotal) * 100
          );
          // console.log("上傳進(jìn)度",uploadFile.uploadPercentage);
          if (index == chunkTotal) {
            emitter.emit("reloadFileList");
          }
          uploadChunk(file, index + 1, uploadFile);
        });
      }
    } else {
      uploadFile.uploadPercentage = parseInt(
        (uploadFile.chunkList.length / chunkTotal) * 100
      );
      uploadChunk(file, index + 1, uploadFile);
    }
    // }
  }
}
</script>
<style  scoped>
.main {
  margin-top: 40px;
  margin-bottom: 40px;
}
.uploading {
  padding-top: 27px;
}
.progress {
  /* width: 700px; */
  display: flex;
}
.uploading .parse {
  display: flex;
}
.parse .el-progress {
  /* font-size: 18px; */
  width: 590px;
}
.progress .el-progress {
  /* font-size: 18px; */
  width: 590px;
}
.uploading .fileName {
  font-size: 17px;
  margin-right: 40px;
  margin-left: 80px;
  /* width: 80px; */
}
.uploading .fileSize {
  font-size: 17px;
  /* width: 80px; */
}
.progress .uploadSpeed {
  font-size: 17px;
  margin-left: 5px;
  padding-left: 5px;
  padding-right: 10px;
}
</style>

package com.cugb.bigfileupload.controller;
import com.cugb.bigfileupload.bean.FilePO;
import com.cugb.bigfileupload.bean.Result;
import com.cugb.bigfileupload.servie.ChunkService;
import com.cugb.bigfileupload.servie.FileService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
@RestController
@CrossOrigin
public class FileController {
    Logger logger = LoggerFactory.getLogger(getClass());
    @Value("${file.path}")
    private String filePath;
    @Autowired
    private FileService fileService;
    @Autowired
    private ChunkService chunkService;
    @GetMapping("/check")
    public Result checkFile(@RequestParam("md5") String md5){
        logger.info("檢查MD5:"+md5);
        //首先檢查是否有完整的文件
        Boolean isUploaded = fileService.selectFileByMd5(md5);
        Map<String, Object> data = new HashMap<>();
        data.put("isUploaded",isUploaded);
        //如果有，就返回秒傳
        if(isUploaded){
            return new Result(201,"文件已經(jīng)秒傳",data);
        }
        //如果沒有，就查找分片信息，并返回給前端
        List<Integer> chunkList = chunkService.selectChunkListByMd5(md5);
        data.put("chunkList",chunkList);
        return  new Result(201,"",data);
    }
    @PostMapping("/upload/chunk")
    public Result uploadChunk(@RequestParam("chunk") MultipartFile chunk,
                              @RequestParam("md5") String md5,
                              @RequestParam("index") Integer index,
                              @RequestParam("chunkTotal")Integer chunkTotal,
                              @RequestParam("fileSize")Long fileSize,
                              @RequestParam("fileName")String fileName,
                              @RequestParam("chunkSize")Long chunkSize
    ){
        String[] splits = fileName.split("\\.");
        String type = splits[splits.length-1];
        String resultFileName = filePath+md5+"."+type;
        chunkService.saveChunk(chunk,md5,index,chunkSize,resultFileName);
        logger.info("上傳分片："+index +" ,"+chunkTotal+","+fileName+","+resultFileName);
        if(Objects.equals(index, chunkTotal)){
            FilePO filePO = new FilePO(fileName, md5, fileSize);
            fileService.addFile(filePO);
            chunkService.deleteChunkByMd5(md5);
            return  new Result(200,"文件上傳成功",index);
        }else{
            return new Result(201,"分片上傳成功",index);
        }
    }
    @GetMapping("/fileList")
    public Result getFileList(){
        logger.info("查詢文件列表");
        List<FilePO> fileList = fileService.selectFileList();
        return  new Result(201,"文件列表查詢成功",fileList);
    }
}

if (index == chunkTotal) {
            var resBlob = new Blob(file.blobList, {
              type: "application/octet-stream",
            });
            // console.log("resb", resBlob);
            let url = window.URL.createObjectURL(resBlob); // 將獲取的文件轉(zhuǎn)化為blob格式
            let a = document.createElement("a"); // 此處向下是打開一個(gè)儲(chǔ)存位置
            a.style.display = "none";
            a.href = url;
            // 下面兩行是自己項(xiàng)目需要的處理，總之就是得到下載的文件名（加后綴）即可
            var fileName = file.name;
            a.setAttribute("download", fileName);
            document.body.appendChild(a);
            a.click(); //點(diǎn)擊下載
            document.body.removeChild(a); // 下載完成移除元素
            window.URL.revokeObjectURL(url); // 釋放掉blob對(duì)象
          }

<template>
  <div class="main">
    <div class="fileList">
      <div class="title">
        文件列表
        <!-- <hr> -->
      </div>
      <el-table :data="fileList" border style="width: 360px">
        <el-table-column prop="name" label="文件名" width="150">
        </el-table-column>
        <el-table-column prop="size" label="文件大小" width="110">
          <template #default="scope">
            {{ formatSize(scope.row) }}
          </template>
        </el-table-column>
        <el-table-column prop="" label="操作" width="100">
          <template #default="scope">
            <el-button
              size="small"
              type="primary"
              @click="downloadFile(scope.row)"
              >下載</el-button
            >
          </template>
        </el-table-column>
      </el-table>
    </div>
    <div class="downloadList">
      <el-divider content-position="left">下載列表</el-divider>
      <div v-for="file in downloadingFileList">
        <div class="downloading">
          <span class="fileName">{{ file.name }}</span>
          <span class="fileSize">{{ formatSize(file) }}</span>
          <span class="downloadSpeed">{{ file.downloadSpeed }}</span>
          <div class="progress">
            <span>下載進(jìn)度：</span>
            <el-progress
              :text-inside="true"
              :stroke-width="16"
              :percentage="file.downloadPersentage"
            >
            </el-progress>
            <el-button circle link @click="changeDownloadStop(file)">
              <el-icon size="20" v-if="file.downloadingStop == false"
                ><VideoPause
              /></el-icon>
              <el-icon size="20" v-else><VideoPlay /></el-icon>
            </el-button>
          </div>
        </div>
      </div>
    </div>
  </div>
</template>
<script setup>
import axios from "axios";
import { ref, reactive, getCurrentInstance } from "vue";
import emitter from "../utils/eventBus.js";
import { VideoPause, VideoPlay } from "@element-plus/icons-vue";
const { appContext } = getCurrentInstance();
const request = appContext.config.globalProperties.request;
var fileList = reactive([]);
var downloadingFileList = ref([]);
//上傳文件之后，重新加載文件列表
emitter.on("reloadFileList", () => {
  load();
});
function load() {
  fileList.length = 0;
  request({
    url: "/fileList",
    method: "get",
  }).then((res) => {
    // console.log("res", res.data.data);
    fileList.push(...res.data.data);
  });
}
load();
//換算文件的大小單位
function formatSize(file) {
  //console.log("size",file.size);
  var size = file.size;
  var unit;
  var units = [" B", " K", " M", " G"];
  var pointLength = 2;
  while ((unit = units.shift()) && size > 1024) {
    size = size / 1024;
  }
  return (
    (unit === "B"
      ? size
      : size.toFixed(pointLength === undefined ? 2 : pointLength)) + unit
  );
}
//點(diǎn)擊暫停下載
function changeDownloadStop(file) {
  file.downloadingStop = !file.downloadingStop;
  if (!file.downloadingStop) {
    console.log("開始。。");
    downloadChunk(1, file);
  }
}
//點(diǎn)擊下載文件
function downloadFile(file) {
  // console.log("下載", file);
  file.downloadingStop = false;
  file.downloadSpeed = "0 M/s";
  file.downloadPersentage = 0;
  file.blobList = [];
  file.chunkList = [];
  downloadingFileList.value.push(file);
  downloadChunk(1, file);
}
//點(diǎn)擊下載文件分片
function downloadChunk(index, file) {
  var chunkSize = 1024 * 1024 * 5;
  var chunkTotal = Math.ceil(file.size / chunkSize);
  if (index <= chunkTotal) {
    // console.log("下載進(jìn)度",index);
    var exit = file.chunkList.includes(index);
    console.log("存在", exit);
    if (!exit) {
      if (!file.downloadingStop) {
        var formData = new FormData();
        formData.append("fileName", file.name);
        formData.append("md5", file.md5);
        formData.append("chunkSize", chunkSize);
        formData.append("index", index);
        formData.append("chunkTotal", chunkTotal);
        if (index * chunkSize >= file.size) {
          chunkSize = file.size - (index - 1) * chunkSize;
          formData.set("chunkSize", chunkSize);
        }
        var startTime = new Date().valueOf();
        axios({
          url: "http://localhost:9001/download",
          method: "post",
          data: formData,
          responseType: "blob",
          timeout: 50000,
        }).then((res) => {
          file.chunkList.push(index);
          var endTime = new Date().valueOf();
          var timeDif = (endTime - startTime) / 1000;
          file.downloadSpeed = (5 / timeDif).toFixed(1) + " M/s";
          //todo
          file.downloadPersentage = parseInt((index / chunkTotal) * 100);
          // var chunk = res.data.data.chunk
          // const blob = new Blob([res.data]);
          const blob = res.data;
          file.blobList.push(blob);
          // console.log("res", blobList);
          if (index == chunkTotal) {
            var resBlob = new Blob(file.blobList, {
              type: "application/octet-stream",
            });
            // console.log("resb", resBlob);
            let url = window.URL.createObjectURL(resBlob); // 將獲取的文件轉(zhuǎn)化為blob格式
            let a = document.createElement("a"); // 此處向下是打開一個(gè)儲(chǔ)存位置
            a.style.display = "none";
            a.href = url;
            // 下面兩行是自己項(xiàng)目需要的處理，總之就是得到下載的文件名（加后綴）即可
            var fileName = file.name;
            a.setAttribute("download", fileName);
            document.body.appendChild(a);
            a.click(); //點(diǎn)擊下載
            document.body.removeChild(a); // 下載完成移除元素
            window.URL.revokeObjectURL(url); // 釋放掉blob對(duì)象
          }
          downloadChunk(index + 1, file);
        });
      }
    } else {
      file.downloadPersentage = parseInt((index / chunkTotal) * 100);
      downloadChunk(index + 1, file);
    }
  }
}
</script>
<style  scoped>
.main {
  display: flex;
}
.fileList {
  width: 400px;
}
.downloadList {
  width: 450px;
}
.title {
  margin-top: 5px;
  margin-bottom: 5px;
}
.downloading {
  margin-top: 10px;
}
.downloading .fileName {
  margin-left: 76px;
  margin-right: 30px;
}
.downloading .fileSize {
  /* margin-left: 70px; */
  margin-right: 30px;
}
.downloading .progress {
  display: flex;
}
.progress .el-progress {
  /* font-size: 18px; */
  width: 310px;
}
</style>

package com.cugb.bigfileupload.controller;
import com.cugb.bigfileupload.servie.ChunkService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.Objects;
@Controller
@CrossOrigin
public class DownLoadController {
    Logger logger = LoggerFactory.getLogger(getClass());
    @Value("${file.path}")
    private String filePath;
    @Autowired
    private ChunkService chunkService;
    @PostMapping("/download")
    public void download(@RequestParam("md5") String md5,
                           @RequestParam("fileName") String fileName,
                           @RequestParam("chunkSize") Integer chunkSize,
                         @RequestParam("chunkTotal") Integer chunkTotal,
                           @RequestParam("index")Integer index,
                         HttpServletResponse response) {
        String[] splits = fileName.split("\\.");
        String type = splits[splits.length - 1];
        String resultFileName = filePath + md5 + "." + type;
        File resultFile = new File(resultFileName);
        long offset = (long) chunkSize * (index - 1);
        if(Objects.equals(index, chunkTotal)){
            offset = resultFile.length() -chunkSize;
        }
        byte[] chunk = chunkService.getChunk(index, chunkSize, resultFileName,offset);
        logger.info("下載文件分片" + resultFileName + "," + index + "," + chunkSize + "," + chunk.length+","+offset);
//        response.addHeader("Access-Control-Allow-Origin","Content-Disposition");
        response.addHeader("Content-Disposition", "attachment;filename=" + fileName);
        response.addHeader("Content-Length", "" + (chunk.length));
        response.setHeader("filename", fileName);
        response.setContentType("application/octet-stream");
        ServletOutputStream out = null;
        try {
            out = response.getOutputStream();
            out.write(chunk);
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}