1. 最近各种文件分享平台，很多都要注册， 对于很多需要临时分享文件下的场景，不想被这种东西烦恼，于是借鉴网上代码，进行了一些修改， 写了一个文件分享项目， 该项目只是自用，数据库都没用， 就是简单的上传，下载， 删除也没有。如果有同样需求的同学可以看一下。
项目完整地址下载： cloudfile: 大文件断点续传， 文件分享，项目案例
下载后配置下路径和下载目录，正常运行即可
package com.zzk.cloudfile.demos.web;import cn.hutool.core.io.FileUtil;
import cn.hutool.core.util.RandomUtil;
import cn.hutool.crypto.digest.DigestUtil;
import cn.hutool.json.JSONObject;
import cn.hutool.json.JSONUtil;
import com.zzk.cloudfile.demos.web.common.AjaxResult;
import com.zzk.cloudfile.demos.web.common.SliceBadException;
import com.zzk.cloudfile.demos.web.util.ExecutorUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Future;
import java.util.stream.Collectors;@Controller
public class BasicController {private final String identification = "-slice-";private final String uploadslicedir = "uploads" + File.separator + "slice" + File.separator;//分片目录private final String uploaddir = "uploads" + File.separator + "real" + File.separator;//实际文件目录
// private final String physicalPath = "D:\\cloudfile\\";private final String physicalPath = "/cloudfile/";private final String virtualPath = "http://10.123.123.125:8081/uploads/real/";// http://127.0.0.1:8080/hello?name=lisi@RequestMapping("/hello")@ResponseBodypublic String hello(@RequestParam(name = "name", defaultValue = "unknown user") String name) {return "Hello " + name;}//获取分片@GetMapping("/testing/{fileName}/{fileSliceSize}/{fileSize}")@ResponseBodypublic AjaxResult testing(@PathVariable String fileName, @PathVariable long fileSliceSize, @PathVariable long fileSize) {String dir = fileNameMd5Dir(fileName, fileSize);String absolutePath = physicalPath + uploadslicedir + dir;File file = FileUtil.mkdir(absolutePath);if (!file.exists()) {return AjaxResult.error();}List<File> filesAll = FileUtil.loopFiles(file.getAbsolutePath());if (filesAll.size() < 2) {//分片缺少 删除全部分片文件 ,从新上传FileUtil.clean(absolutePath);return AjaxResult.error();}//从小到大文件进行按照序号排序,和判断分片是否损坏List<String> collect = null;try {collect = fileSliceIsbadAndSort(file, fileSliceSize);} catch (Exception e) {if (e instanceof SliceBadException) {FileUtil.clean(absolutePath);return AjaxResult.error();}}//获取最后一个分片String fileSliceLatest = collect.get(collect.size() - 1);int code = fileId(fileSliceLatest);//服务器的分片总大小必须小于或者等于文件的总大小if ((code * fileSliceSize) <= fileSize) {JSONObject obj = JSONUtil.createObj();obj.set("code", String.valueOf(code));obj.set("fileSliceLatest", fileSliceLatest);obj.set("progressNow", collect.size());return AjaxResult.success(obj);} else {//分片异常 ,删除全部分片文件,从新上传FileUtil.clean(absolutePath);return AjaxResult.error();}}@PostMapping(value = "/uploads")@ResponseBodypublic AjaxResult uploads(HttpServletRequest request, @RequestParam("part") MultipartFile part) throws IOException {String fileSliceName = request.getParameter("fileSliceName");long fileSize = Long.parseLong(request.getParameter("fileSize")); //文件大小String dir = fileSliceMd5Dir(fileSliceName, fileSize);File file = FileUtil.mkdir(physicalPath + uploadslicedir + dir + File.separator + fileSliceName);part.transferTo(file);int i = fileId(file.getName());
// try {
// //模拟耗时操作，要不前端显示太快,正式时删除
// Thread.sleep(RandomUtil.randomInt(2000, 5000, true, true));
// } catch (InterruptedException e) {
// e.printStackTrace();
// }return AjaxResult.success(i);}// 合并分片@GetMapping(value = "/merge-file-slice/{fileSliceName}/{fileSliceSize}/{fileSize}")@ResponseBodypublic AjaxResult mergeFileSlice(@PathVariable String fileSliceName, @PathVariable long fileSliceSize, @PathVariable long fileSize) throws Exception {int l = (int) Math.ceil((double) fileSize / fileSliceSize); //有多少个分片String dir = fileSliceMd5Dir(fileSliceName, fileSize); //分片所在的目录String absolutePath = physicalPath + uploadslicedir + dir;File file = FileUtil.mkdir(absolutePath);String realFileName;String realFileNamePath;if (file.exists()) {List<String> filesAll = FileUtil.listFileNames(absolutePath);//阻塞循环判断是否还在上传 ,解决前端进行ajax异步上传的问题int beforeSize = filesAll.size();while (true) {if (filesAll.size() == l) {break;}Thread.sleep(1000);//之前分片数量和现在分片数据之差,如果大于1那么就在上传,那么继续filesAll = FileUtil.listFileNames(absolutePath);if (filesAll.size() - beforeSize >= 1) {beforeSize = filesAll.size();//继续检测continue;}//如果是之前分片和现在的分片相等的,那么在阻塞2秒后检测是否发生变化,如果还没变化那么上传全部完成,可以进行合并了//当然这不是绝对的,只能解决网络短暂的波动,因为有可能发生断网很长时间,网络恢复后文件恢复上传, 这个问题是避免不了的,所以我们在下面的代码进行数量的效验// 因为我们不可能一直等着他网好,所以如果1~3秒内没有上传新的内容,那么我们默认判定上传完毕if (beforeSize == filesAll.size()) {Thread.sleep(2000);filesAll = FileUtil.listFileNames(absolutePath);if (beforeSize == filesAll.size()) {break;}}}//分片数量效验if (filesAll.size() != l) {//分片缺少 ,删除全部分片文件,从新上传FileUtil.clean(absolutePath);return AjaxResult.error();}//获取实际的文件名称,组装路径realFileName = realFileName(fileSliceName);realFileNamePath = physicalPath + uploaddir + realFileName;//从小到大文件进行按照序号排序 ,和检查分片文件是否有问题List<String> collect = fileSliceIsbadAndSort(file, fileSliceSize);int fileSliceCount = collect.size();FileUtil.touch(realFileNamePath);List<Future<?>> futures = new ArrayList<>();for (int i = 0; i < fileSliceCount; i++) {int finalI = i;Future<?> future = ExecutorUtils.createFuture(() -> {String fileNameTemp = collect.get(finalI);long fileTempSize = new File(absolutePath + File.separator+fileNameTemp).length();byte[] bytes = new byte[(int) fileTempSize];try (RandomAccessFile r = new RandomAccessFile(absolutePath + File.separator +fileNameTemp, "r")) {r.read(bytes, 0, (int) fileTempSize);} catch (IOException e) {e.printStackTrace();}try (RandomAccessFile w = new RandomAccessFile(realFileNamePath, "rw")) {//当前文件写入的位置w.seek(finalI * fileSliceSize);w.write(bytes);} catch (IOException e) {e.printStackTrace();}return 1;});futures.add(future);}//阻塞到全部线程执行完毕后ExecutorUtils.waitComplete(futures);//删除全部分片文件FileUtil.clean(absolutePath);} else {//没有这个分片相关的的目录return AjaxResult.error();}return AjaxResult.success(virtualPath + realFileName);}//获取分片文件的目录private String fileSliceMd5Dir(String fileSliceName, long fileSize) {int i = fileSliceName.indexOf(identification);String substring = fileSliceName.substring(0, i);String dir = DigestUtil.md5Hex(substring + fileSize);return dir;}//通过文件名称获取文件目录private String fileNameMd5Dir(String fileName, long fileSize) {return DigestUtil.md5Hex(fileName + fileSize);}//获取分片的实际文件名private String realFileName(String fileSliceName) {int i = fileSliceName.indexOf(identification);String substring = fileSliceName.substring(0, i);return substring;}//获取文件序号private int fileId(String fileSliceName) {int i = fileSliceName.indexOf(identification) + identification.length();String fileId = fileSliceName.substring(i);return Integer.parseInt(fileId);}//判断是否损坏private List<String> fileSliceIsbadAndSort(File file, long fileSliceSize) throws Exception {String absolutePath = file.getAbsolutePath();List<String> filesAll = FileUtil.listFileNames(absolutePath);if (filesAll.size() < 1) {//分片缺少,删除全部分片文件 ,从新上传FileUtil.clean(absolutePath);throw new SliceBadException();}//从小到大文件进行按照序号排序List<String> collect = filesAll.stream().sorted((a, b) -> fileId(a) - fileId(b)).collect(Collectors.toList());//判断文件是否损坏,将文件排序后,进行前后序号相差大于1那么就代表少分片了for (int i = 0; i < collect.size() - 1; i++) {//检测分片的连续度if (fileId(collect.get(i)) - fileId(collect.get(i + 1)) != -1) {//分片损坏 删除全部分片文件 ,从新上传FileUtil.clean(absolutePath);throw new SliceBadException();}//检测分片的完整度if (new File(absolutePath + File.separator + collect.get(i)).length() != fileSliceSize) {//分片损坏 删除全部分片文件 ,从新上传FileUtil.clean(absolutePath);throw new SliceBadException();}}return collect;}}
//大文件分片上传,比如10G的压缩包,或者视频等,这些文件太大了 (需要后端配合进行)
class FileSliceUpload {constructor(testingUrl, uploadUrl, margeUrl, fileSelect) {this.testingUrl = testingUrl; // 检测文件上传的urlthis.uploadUrl = uploadUrl;//文件上传接口this.margeUrl = margeUrl; // 合并文件接口this.fileSelect = fileSelect;this.fileObj = null;this.totalsize = null;this.blockSize = 1024 * 1024; //每次上传多少字节1mb(最佳)this.sta = 0; //起始位置this.end = this.sta + this.blockSize; //结束位置this.count = 0; //分片个数this.barId = "bar"; //进度条idthis.progressId = "progress";//进度数值IDthis.progressNow = 0;this.progressTotal = 0;this.fileSliceName = ""; //分片文件名称this.fileName = "";this.uploadFileInterval = null; //上传文件定时器}/*** 样式可以进行修改* @param {*} progressId 需要将进度条添加到那个元素下面*/addProgress(progressSelect) {let bar = document.createElement("div")bar.setAttribute("id", this.barId);let num = document.createElement("div")num.setAttribute("id", this.progressId);num.innerText = "0%"bar.appendChild(num);document.querySelector(progressSelect).appendChild(bar)}//续传 在上传前先去服务器检测之前是否有上传过这个文件,如果还有返回上传的的分片,那么进行续传// 将当前服务器上传的最后一个分片会从新上传, 避免因为网络的原因导致分片损坏sequelFile() {if (this.fileName) {var xhr = new XMLHttpRequest();//同步var url = this.testingUrl + "/" + this.fileName + "/" + this.blockSize + "/" + this.totalsize;xhr.open('GET', encodeURI(url), false);xhr.send();if (xhr.readyState === 4 && xhr.status === 200) {let ret = JSON.parse(xhr.response)if (ret.code == 0) {let data = ret.datathis.count = data.code;this.fileSliceName = data.fileSliceName//计算起始位置和结束位置this.sta = this.blockSize * this.count//计算结束位置this.end = this.sta + this.blockSizethis.progressNow = data.progressNow} else {this.sta = 0; //从头开始this.end = this.sta + this.blockSize;this.count = 0; //分片个数this.progressNow = 0;}}}}stopUploadFile() {console.log("stop!!!")clearInterval(this.uploadFileInterval)}// 文件上传(单文件)startUploadFile() {this.resetProgress();this.fileObj = document.querySelector(this.fileSelect).files[0];this.totalsize = this.fileObj.size;this.fileName = this.fileObj.name;this.progressTotal = Math.ceil(this.totalsize / this.blockSize)console.log("文件总大小：" + this.totalsize + ", 需要分片个数： " + this.progressTotal )//查询是否存在之前上传过此文件,然后继续this.sequelFile()let ref = this; //拿到当前对象的引用,因为是在异步中使用this就是他本身而不是classthis.uploadFileInterval = setInterval(function () {if (ref.sta > ref.totalsize) {//上传完毕后结束定时器clearInterval(ref.uploadFileInterval)//发送合并请求ref.margeUploadFile()console.log("stop" + ref.sta);return;};//分片名称ref.fileSliceName = ref.fileName + "-slice-" + ref.count++//分割文件 ,var blob1 = ref.fileObj.slice(ref.sta, ref.end);console.log("start: "+ ref.sta + ", end : "+ ref.end)var fd = new FormData();fd.append('part', blob1);fd.append('fileSliceName', ref.fileSliceName);fd.append('fileSize', ref.totalsize);var xhr = new XMLHttpRequest();xhr.open('POST', ref.uploadUrl, true);xhr.send(fd); //异步发送文件,不管是否成功, 会定期检测xhr.onreadystatechange = function () {if (xhr.readyState === 4 && xhr.status === 200) {let ret = JSON.parse(xhr.response)if (ret.code == 0) {console.log(ret.data);ref.progressNow++;ref.calculateProgress();}}}//起始位置等于上次上传的结束位置ref.sta = ref.end;//结束位置等于上次上传的结束位置+每次上传的字节ref.end = ref.sta + ref.blockSize;}, 100)}margeUploadFile() {console.log("检测上传的文件完整性..........");var xhr = new XMLHttpRequest();//文件分片的名称/分片大小/总大小var url = this.margeUrl + "/" + this.fileSliceName + "/" + this.blockSize + "/" + this.totalsize;xhr.open('GET', encodeURI(url), true);xhr.send(); //发送请求xhr.onreadystatechange = function () {if (xhr.readyState === 4 && xhr.status === 200) {let ret = JSON.parse(xhr.response)if (ret.code == 0) {console.log("文件上传完毕");let address = document.getElementById("address");address.value = ret.msg;address.style.display = "block"} else {console.log("上传完毕但是文件上传过程中出现了异常", ret);}}}}calculateProgress() {let bar = document.getElementById(this.barId)let progressEl = document.getElementById(this.progressId)let percent = Math.ceil((this.progressNow / this.progressTotal) * 100)if (percent > 100) {percent = 100}bar.style.width = percent + '%';bar.style.backgroundColor = 'green';progressEl.innerHTML = percent + '%'}resetProgress(){let bar = document.getElementById(this.barId)let progressEl = document.getElementById(this.progressId)bar.style.width = 0 + '%';bar.style.backgroundColor = 'green';progressEl.innerHTML = 0 + '%'}}
