文件分片上传（模拟网盘效果）
- 文章说明
- 简单模拟拖拽文件夹和选择文件的进度条效果
- 效果展示
- 结合后端实现文件上传
- 效果展示
- 加上分片的效果
- 效果展示
- 加上MD5的校验，实现秒传和分片的效果
- 后续开发说明
- 源码下载
文章说明
文章主要为了学习文件上传，以及分片上传的一些简单操作；更多的学习一些前端相关的文件操作的知识，包括拖拽文件函数和打开文件函数
参考资料1：window.showOpenFilePicker方法的使用
简单模拟拖拽文件夹和选择文件的进度条效果
代码如下（仿照element的样式书写，进度条也是仿照element的样式写的）
App.vue（目前还没有结合后台上传逻辑，然后也只是简单的写了一个界面效果）
<template><link rel="stylesheet" href="/style/css/iconfont.css"><div class="drop-area" @drop="getDropItems" @click="showFilePicker"><div><i class="iconfont icon-upload"/><div class="tip-text">Drop file here or<em>click to upload</em></div></div></div><div class="file-list"><div v-for="(item, index) in data.fileList" :key="index" class="single-file"><MyProgress :percentage="item.percentage" :content="item.name"/></div></div>
</template><script>
import {onBeforeMount, reactive} from "vue";
import MyProgress from "@/MyProgress.vue";
import {message} from "@/util";export default {name: "App",components: {MyProgress},setup() {const data = reactive({fileList: [],isUploading: false,});onBeforeMount(() => {onload = function () {document.addEventListener("drop", function (e) {//拖离e.preventDefault();});document.addEventListener("dragleave", function (e) {//拖后放e.preventDefault();});document.addEventListener("dragenter", function (e) {//拖进e.preventDefault();});document.addEventListener("dragover", function (e) {//拖来拖去e.preventDefault();});};});function getFileFromEntryRecursively(entry) {if (entry.isFile) {data.fileList.push({name: entry.fullPath.substring(entry.fullPath.lastIndexOf("/") + 1, entry.fullPath.length),percentage: 0});} else {let reader = entry.createReader();reader.readEntries((entries) => {entries.forEach((entry) => {getFileFromEntryRecursively(entry);});});}}function getDropItems(event) {if (data.isUploading) {message("正在上传...", "info");return;}data.fileList = [];data.isUploading = true;const items = event.dataTransfer.items;for (let i = 0; i <= items.length - 1; i++) {const item = items[i];if (item.kind === "file") {const reader = new FileReader();reader.readAsArrayBuffer(item.getAsFile());console.log(reader)const entry = item.webkitGetAsEntry();getFileFromEntryRecursively(entry);}}const timer = setInterval(() => {upload();closeTimer(timer);}, 100);}function upload() {for (let i = 0; i < data.fileList.length; i++) {data.fileList[i].percentage += 1;}}function closeTimer(timer) {let isOver = true;for (let i = 0; i < data.fileList.length; i++) {if (data.fileList[i].percentage !== 100) {isOver = false;break;}}if (isOver) {clearInterval(timer);data.isUploading = false;}}const pickerOpts = {excludeAcceptAllOption: false,multiple: true,};async function showFilePicker() {if (data.isUploading) {message("正在上传...", "info");return;}let fileHandle;try {fileHandle = await window.showOpenFilePicker(pickerOpts);data.fileList = [];data.isUploading = true;} catch (e) {if (e.name === 'AbortError' && e.message === 'The user aborted a request.') {message("用户没有选择文件", "info");return;} else {throw e;}}for (let i = 0; i < fileHandle.length; i++) {data.fileList.push({name: fileHandle[i].name,percentage: 0});const arrayBuffer = (await fileHandle[i].getFile()).arrayBuffer();console.log(arrayBuffer)let formData = new FormData();formData.append("file", arrayBuffer);console.log(formData)}const timer = setInterval(() => {upload();closeTimer(timer);}, 100);}return {data,getDropItems,showFilePicker,};},
};
</script><style>
* {padding: 0;margin: 0;box-sizing: border-box;
}.drop-area {margin: 100px auto 0;width: 800px;height: 180px;border: 1px dashed #dcdfe6;display: flex;align-items: center;justify-content: center;
}.drop-area:hover {border-color: #409eff;cursor: pointer;
}.icon-upload::before {display: flex;justify-content: center;font-size: 40px;margin: 10px 0;
}.tip-text {color: #606266;font-size: 14px;text-align: center;
}.tip-text em {color: #409eff;font-style: normal;
}.file-list {margin: 0 auto;width: 800px;
}.single-file {margin: 10px 0;
}
</style>
MyProgress.vue
<template><link rel="stylesheet" href="/style/css/iconfont.css"><div class="progress-container"><div class="bar"><div class="percentage" :style="{'width': props.percentage + '%'}"><span class="text-inside">{{ props.content + " " + props.percentage + "%" }}</span></div></div><div class="tip-content"><span v-show="props.percentage !== 100">{{ props.percentage + "%" }}</span><i class="iconfont icon-over" v-show="props.percentage === 100"/></div></div>
</template><script>
export default {props: ["percentage", "content"],setup(props) {return {props}}
}
</script><style scoped>
.progress-container {display: flex;height: 30px;cursor: pointer;border: 1px dashed #dcdfe6;padding: 0 10px;
}.bar {color: white;font-weight: 500;line-height: 30px;font-size: 14px;flex: 1;
}.percentage {border-radius: 30px;background-color: #67c23a;white-space: nowrap;word-break: break-all;overflow: hidden;transition: width 0.2s linear;
}.text-inside {padding-right: 10px;padding-left: 15px;float: right;
}.tip-content {padding: 0 10px;font-size: 16px;line-height: 30px;width: 40px;
}.icon-over::before {font-size: 24px;color: #67c23a;
}
</style>
效果展示
简单演示了选择文件和拖拽文件、拖拽文件夹的效果
结合后端实现文件上传
后端采用SpringBoot简单写了一个接收文件的小demo
package com.boot.controller;import com.boot.entity.Result;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;/*** <p>* 前端控制器* </p>** @author bbyh* @since 2023-12-27*/
@Slf4j
@RestController
@RequestMapping("/fragment-info")
public class FragmentInfoController {@PostMapping("/upload")public Result upload(@RequestBody MultipartFile file) {log.info(file.getOriginalFilename());return Result.success("文件上传成功", null);}
}
此时前端需要一些变化，将拖拽的文件列表和选择的文件列表都放入列表中，这里主要考察前端相关的文件操作；我找了一些资料，后面抓到了它的实现效果
util.js（主要就是一个 ajax 的post请求，携带一个onUploadProgress属性）
import {ElMessage} from "element-plus";
import axios from "axios";const baseUrl = "http://127.0.0.1:8080"export function message(msg, type) {ElMessage({message: msg,type: type,center: true,showClose: true,})
}export const postFileRequest = (url, data, onUploadProgress) => {return axios({method: 'post',url: baseUrl + url,data: data,onUploadProgress: onUploadProgress,})
}
App.vue（主要的逻辑都写在这里了，这里的异步和Promise，真的给我上了一课，我对这些概念的理解层次还差了不少）
而且我在尝试的时候，还通过提问GPT发现了：for循环中使用了await，这会导致循环在遇到第一个await时立即退出；真是还没学到家
<template><link rel="stylesheet" href="/style/css/iconfont.css"><div class="drop-area" @drop="getDropItems" @click="showFilePicker"><div><i class="iconfont icon-upload"/><div class="tip-text">Drop file here or<em>click to upload</em></div></div></div><div class="file-list"><div v-for="(item, index) in data.fileList" :key="index" class="single-file"><MyProgress :percentage="item.percentage" :content="item.name"/></div></div>
</template><script>
import {onBeforeMount, reactive} from "vue";
import MyProgress from "@/MyProgress.vue";
import {message, postFileRequest} from "@/util";export default {name: "App",components: {MyProgress},setup() {const data = reactive({fileList: [],isUploading: false,});onBeforeMount(() => {onload = function () {document.addEventListener("drop", function (e) {//拖离e.preventDefault();});document.addEventListener("dragleave", function (e) {//拖后放e.preventDefault();});document.addEventListener("dragenter", function (e) {//拖进e.preventDefault();});document.addEventListener("dragover", function (e) {//拖来拖去e.preventDefault();});};});function getFileFromEntryRecursively(entry) {return new Promise((resolve) => {if (entry.isFile) {entry.file((file) => {data.fileList.push({name: entry.fullPath.substring(entry.fullPath.lastIndexOf("/") + 1, entry.fullPath.length),percentage: 0,file: file});resolve();});} else {let reader = entry.createReader();reader.readEntries((entries) => {Promise.all(entries.map(entry => getFileFromEntryRecursively(entry))).then(() => {resolve();});});}});}async function getDropItems(event) {if (data.isUploading) {message("正在上传...", "info");return;}data.fileList = [];data.isUploading = true;const items = event.dataTransfer.items;const promises = [];for (const item of items) {if (item.kind === "file") {const entry = item.webkitGetAsEntry();promises.push(getFileFromEntryRecursively(entry));}}await Promise.all(promises);upload();}function upload() {for (let i = 0; i < data.fileList.length; i++) {const onUploadProgress = (progressEvent) => {data.fileList[i].percentage = parseInt(Number(((progressEvent.loaded / progressEvent.total) * 100)).toFixed(0));};const formData = new FormData();formData.append("file", data.fileList[i].file);postFileRequest("/fragment-info/upload", formData, onUploadProgress).then((res) => {if (res.data.code === "200") {message(res.data.msg, "success");} else if (res.data.code === "500") {message(res.data.msg, "error");}});}}const pickerOpts = {excludeAcceptAllOption: false,multiple: true,};async function showFilePicker() {if (data.isUploading) {message("正在上传...", "info");return;}let fileHandle;try {fileHandle = await window.showOpenFilePicker(pickerOpts);data.fileList = [];data.isUploading = true;} catch (e) {if (e.name === 'AbortError' && e.message === 'The user aborted a request.') {message("用户没有选择文件", "info");return;} else {throw e;}}for (let i = 0; i < fileHandle.length; i++) {const file = await fileHandle[i].getFile();data.fileList.push({name: fileHandle[i].name,percentage: 0,file: file});}upload();}return {data,getDropItems,showFilePicker,};},
};
</script><style>
* {padding: 0;margin: 0;box-sizing: border-box;
}.drop-area {margin: 100px auto 0;width: 800px;height: 180px;border: 1px dashed #dcdfe6;display: flex;align-items: center;justify-content: center;
}.drop-area:hover {border-color: #409eff;cursor: pointer;
}.icon-upload::before {display: flex;justify-content: center;font-size: 40px;margin: 10px 0;
}.tip-text {color: #606266;font-size: 14px;text-align: center;
}.tip-text em {color: #409eff;font-style: normal;
}.file-list {margin: 0 auto;width: 800px;
}.single-file {margin: 10px 0;
}
</style>
进度条还是和上面的一样
效果展示
这次是自动的进度条展示，和之前模拟的差不多（为了方便演示，我在后端设置了最大上传大小，改为了100MB，后续的分片上传，我选择将每个分片设置为2MB，当然大小可以自己调整）
在application.properties里面增加一个配置（设置单个文件最大100MB，总请求最大200MB）
spring.servlet.multipart.enabled=true
spring.servlet.multipart.max-file-size=100MB
spring.servlet.multipart.max-request-size=200MB
加上分片的效果
后端代码没有变化，主要还是前端App.vue里面的逻辑添加了一些，处理分片相关的逻辑
<template><link rel="stylesheet" href="/style/css/iconfont.css"><div class="drop-area" @drop="getDropItems" @click="showFilePicker"><div><i class="iconfont icon-upload"/><div class="tip-text">Drop file here or<em>click to upload</em></div></div></div><div class="file-list"><div v-for="(item, index) in data.fileList" :key="index" class="single-file" @click="showFragmentInfo(item)"><MyProgress :percentage="item.percentage" :content="item.name"/></div></div><el-dialog v-model="data.fragmentDialogVisible" title="分片详情查看" width="80%"><div v-for="(item, index) in data.showFragmentList" :key="index" class="single-file"><MyProgress :percentage="item.percentage" :content="item.name"/></div><template #footer><span class="dialog-footer"><el-button @click="data.fragmentDialogVisible = false">关闭</el-button></span></template></el-dialog>
</template><script>
import {onBeforeMount, reactive} from "vue";
import MyProgress from "@/MyProgress.vue";
import {EACH_FILE, message, postFileRequest} from "@/util";export default {name: "App",components: {MyProgress},setup() {const data = reactive({fileList: [],isUploading: false,fragmentDialogVisible: false,showFragmentList: []});onBeforeMount(() => {onload = function () {document.addEventListener("drop", function (e) {//拖离e.preventDefault();});document.addEventListener("dragleave", function (e) {//拖后放e.preventDefault();});document.addEventListener("dragenter", function (e) {//拖进e.preventDefault();});document.addEventListener("dragover", function (e) {//拖来拖去e.preventDefault();});};});function getFileFromEntryRecursively(entry) {return new Promise((resolve) => {if (entry.isFile) {entry.file((file) => {data.fileList.push({name: entry.fullPath.substring(entry.fullPath.lastIndexOf("/") + 1, entry.fullPath.length),percentage: 0,file: file,totalSize: file.size,totalCompleteSize: 0});resolve();});} else {let reader = entry.createReader();reader.readEntries((entries) => {Promise.all(entries.map(entry => getFileFromEntryRecursively(entry))).then(() => {resolve();});});}});}async function getDropItems(event) {if (data.isUploading) {message("正在上传...", "info");return;}data.fileList = [];data.isUploading = true;const items = event.dataTransfer.items;const promises = [];for (const item of items) {if (item.kind === "file") {const entry = item.webkitGetAsEntry();promises.push(getFileFromEntryRecursively(entry));}}await Promise.all(promises);upload();}function upload() {for (let i = 0; i < data.fileList.length; i++) {const fragmentCount = Math.floor(data.fileList[i].file.size / EACH_FILE) + 1;const fragmentList = [];for (let j = 0; j < fragmentCount; j++) {fragmentList.push({id: j,fragmentFile: data.fileList[i].file.slice(j * EACH_FILE, (j + 1) * EACH_FILE),completeSize: 0,name: data.fileList[i].name + "分片" + (j + 1),percentage: 0,});}data.fileList[i].fragmentList = fragmentList;for (let j = 0; j < data.fileList[i].fragmentList.length; j++) {const onUploadProgress = (progressEvent) => {data.fileList[i].fragmentList[j].completeSize = progressEvent.loaded;data.fileList[i].fragmentList[j].percentage = parseInt(Number(((progressEvent.loaded / progressEvent.total) * 100)).toFixed(0));updateTotalPercentage(i);};const formData = new FormData();formData.append("file", data.fileList[i].fragmentList[j].fragmentFile, data.fileList[i].fragmentList[j].name);postFileRequest("/fragment-info/upload", formData, onUploadProgress).then((res) => {if (res.data.code === "200") {message(res.data.msg, "success");} else if (res.data.code === "500") {message(res.data.msg, "error");}});}}}function updateTotalPercentage(i) {let totalCompleteSize = 0;for (let j = 0; j < data.fileList[i].fragmentList.length; j++) {totalCompleteSize += data.fileList[i].fragmentList[j].completeSize;}data.fileList[i].totalCompleteSize = totalCompleteSize;data.fileList[i].percentage = parseInt(Number(data.fileList[i].totalCompleteSize / data.fileList[i].totalSize * 100).toFixed(0));}const pickerOpts = {excludeAcceptAllOption: false,multiple: true,};async function showFilePicker() {if (data.isUploading) {message("正在上传...", "info");return;}let fileHandle;try {fileHandle = await window.showOpenFilePicker(pickerOpts);data.fileList = [];data.isUploading = true;} catch (e) {if (e.name === 'AbortError' && e.message === 'The user aborted a request.') {message("用户没有选择文件", "info");return;} else {throw e;}}for (let i = 0; i < fileHandle.length; i++) {const file = await fileHandle[i].getFile();data.fileList.push({name: fileHandle[i].name,percentage: 0,file: file,totalSize: file.size,totalCompleteSize: 0});}upload();}function showFragmentInfo(item) {data.showFragmentList = item.fragmentList;data.fragmentDialogVisible = true;}return {data,getDropItems,showFilePicker,showFragmentInfo,};},
};
</script><style>
* {padding: 0;margin: 0;box-sizing: border-box;
}.drop-area {margin: 100px auto 0;width: 800px;height: 180px;border: 1px dashed #dcdfe6;display: flex;align-items: center;justify-content: center;
}.drop-area:hover {border-color: #409eff;cursor: pointer;
}.icon-upload::before {display: flex;justify-content: center;font-size: 40px;margin: 10px 0;
}.tip-text {color: #606266;font-size: 14px;text-align: center;
}.tip-text em {color: #409eff;font-style: normal;
}.file-list {margin: 0 auto;width: 800px;
}.single-file {margin: 10px 0;
}
</style>
效果展示
分片大小目前设置为2MB
加上MD5的校验，实现秒传和分片的效果
在这部分，我是真的被JavaScript的这个Promise和async、await给整麻了；感觉自己还差的不少
在这部分就加上了数据库部分的逻辑，Dao层采用的是Mybatis-Plus，然后本来是打算采用16位的byte数组来存md5字符串转化后的结果，不过在实现的时候遇到了一点小问题，后面我会在尝试一下看看；主要是考虑到数据库索引的速度；不过如果采用char(32) 类型的话，加上索引，速度应该也还不错
数据库创建，就只简单的创建了两个表，后面会在Gitee上同步完整版本，添加上安全校验方面的一些内容
CREATE TABLE `file_info` (`id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',`file_name` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '文件名称',`MD5` char(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '文件的MD5值',`path` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '文件的路径',`create_time` datetime NOT NULL COMMENT '文件创建时间',`delete_state` bit(1) NOT NULL COMMENT '文件删除状态',PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 3 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;CREATE TABLE `fragment_info` (`id` int(11) NOT NULL AUTO_INCREMENT COMMENT 'ID',`fragment_name` varchar(100) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '分片文件名称',`fragment_order` int(11) NOT NULL COMMENT '分片文件序号',`md5` char(32) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '分片文件的MD5值，采用转为16字节的数字存储',`path` varchar(200) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL COMMENT '分片文件存储路径',`create_time` datetime NOT NULL COMMENT '分片文件创建时间',`delete_state` bit(1) NOT NULL COMMENT '删除状态（0表示未删除，1表示删除）',PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 58 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;
在这个数据表创建部分，实际少了两个字段，分别是文件的id，以及分片文件的id及其主文件id，这样会更方便后续的功能开发；不过目前的小demo，当前的数据表是够用的
后端代码（目前主要实现上传部分的逻辑，后端文件保存到指定目录和拼接的相关部分还没有补全）
package com.boot.controller;import cn.hutool.core.collection.ListUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.boot.entity.FileInfo;
import com.boot.entity.Result;
import com.boot.service.IFileInfoService;
import com.boot.util.FileUtil;
import com.boot.util.GetCurrentTime;
import org.springframework.web.bind.annotation.*;import javax.annotation.Resource;
import java.io.File;
import java.util.List;
import java.util.Map;/*** <p>* 前端控制器* </p>** @author bbyh* @since 2023-12-27*/
@RestController
@RequestMapping("/file-info")
public class FileInfoController {@Resourceprivate IFileInfoService fileInfoService;@PostMapping("/generateFile")public Result generateFile(@RequestBody Map<String, Object> map) {String name = (String) map.get("name");String md5 = (String) map.get("md5");List<String> fragmentMd5List = ListUtil.toList(map.get("fragmentMd5List").toString());FileInfo fileInfo = new FileInfo();fileInfo.setFileName(name);fileInfo.setMd5(md5);fileInfo.setPath(FileUtil.ROOT_PATH + md5 + File.separator + name);fileInfo.setCreateTime(GetCurrentTime.getCurrentTimeBySecond());fileInfo.setDeleteState(false);fileInfoService.save(fileInfo);return Result.success("文件：" + name + "上传成功", null);}@GetMapping("/checkMd5")public Result checkMd5(@RequestParam String md5) {QueryWrapper<FileInfo> wrapper = new QueryWrapper<>();wrapper.eq("md5", md5).eq("delete_state", "0");FileInfo fileInfo = fileInfoService.getOne(wrapper);if (fileInfo != null) {return Result.success("MD5已存在", null);} else {fileInfoService.remove(wrapper);return Result.error("MD5不存在", null);}}}
package com.boot.controller;import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.boot.entity.FragmentInfo;
import com.boot.entity.Result;
import com.boot.service.IFragmentInfoService;
import com.boot.util.GetCurrentTime;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;import javax.annotation.Resource;
import java.io.File;import static com.boot.util.FileUtil.FRAGMENT_SPLIT;
import static com.boot.util.FileUtil.ROOT_PATH;/*** <p>* 前端控制器* </p>** @author bbyh* @since 2023-12-27*/
@Slf4j
@RestController
@RequestMapping("/fragment-info")
public class FragmentInfoController {@Resourceprivate IFragmentInfoService fragmentInfoService;@PostMapping("/upload")public Result upload(@RequestBody MultipartFile file, @RequestParam String md5) {String originalFilename = file.getOriginalFilename();assert originalFilename != null;int lastIndexOf = originalFilename.lastIndexOf(FRAGMENT_SPLIT);FragmentInfo fragmentInfo = new FragmentInfo();fragmentInfo.setFragmentName(originalFilename);fragmentInfo.setFragmentOrder(Integer.parseInt(originalFilename.substring(lastIndexOf + FRAGMENT_SPLIT.length())));fragmentInfo.setPath(ROOT_PATH + md5 + File.separator + originalFilename);fragmentInfo.setMd5(md5);fragmentInfo.setCreateTime(GetCurrentTime.getCurrentTimeBySecond());fragmentInfo.setDeleteState(false);fragmentInfoService.save(fragmentInfo);return Result.success("分片文件：" + originalFilename + "上传成功", null);}@GetMapping("/checkMd5")public Result checkMd5(@RequestParam String md5) {QueryWrapper<FragmentInfo> wrapper = new QueryWrapper<>();wrapper.eq("md5", md5).eq("delete_state", "0");FragmentInfo fragmentInfo = fragmentInfoService.getOne(wrapper);if (fragmentInfo != null) {return Result.success("MD5已存在", null);} else {fragmentInfoService.remove(wrapper);return Result.error("MD5不存在", null);}}}
App.vue，这里的异步的一些内容，我是感觉真的麻了，后面需要再调一调，我感觉里面肯定存在着bug，不过我目前还没测试出来；还遇到了progressEvent对象的loaded大小和文件原本的大小不一致的问题，难搞啊，后面我巧妙的转换了一下，解决了这个bug
<template><link rel="stylesheet" href="/style/css/iconfont.css"><div class="drop-area" @drop="getDropItems" @click="showFilePicker"><div><i class="iconfont icon-upload"/><div class="tip-text">Drop file here or<em>click to upload</em></div></div></div><div class="file-list"><div v-for="(item, index) in data.fileList" :key="index" class="single-file" @click="showFragmentInfo(item)"><MyProgress :percentage="item.percentage" :content="item.name" :transition="item.transition"/></div></div><el-dialog v-model="data.fragmentDialogVisible" title="分片详情查看" width="80%"><div v-for="(item, index) in data.showFragmentList" :key="index" class="single-file"><MyProgress :percentage="item.percentage" :content="item.name"/></div><template #footer><span class="dialog-footer"><el-button @click="data.fragmentDialogVisible = false">关闭</el-button></span></template></el-dialog>
</template><script>
import {onBeforeMount, reactive} from "vue";
import MyProgress from "@/MyProgress.vue";
import {calculateMD5, EACH_FILE, getRequest, message, postFileRequest, postRequest} from "@/util";export default {name: "App",components: {MyProgress},setup() {const data = reactive({fileList: [],isUploading: false,fragmentDialogVisible: false,showFragmentList: []});onBeforeMount(() => {onload = function () {document.addEventListener("drop", function (e) {//拖离e.preventDefault();});document.addEventListener("dragleave", function (e) {//拖后放e.preventDefault();});document.addEventListener("dragenter", function (e) {//拖进e.preventDefault();});document.addEventListener("dragover", function (e) {//拖来拖去e.preventDefault();});};});function getFileFromEntryRecursively(entry) {return new Promise((resolve) => {if (entry.isFile) {entry.file((file) => {data.fileList.push({name: entry.fullPath.substring(entry.fullPath.lastIndexOf("/") + 1, entry.fullPath.length),percentage: 0,file: file,totalSize: file.size,totalCompleteSize: 0,isUpload: false});resolve();});} else {let reader = entry.createReader();reader.readEntries((entries) => {Promise.all(entries.map(entry => getFileFromEntryRecursively(entry))).then(() => {resolve();});});}});}async function getDropItems(event) {if (data.isUploading) {message("正在上传...", "info");return;}data.fileList = [];data.isUploading = true;const items = event.dataTransfer.items;const promises = [];for (const item of items) {if (item.kind === "file") {const entry = item.webkitGetAsEntry();promises.push(getFileFromEntryRecursively(entry));}}await Promise.all(promises);await upload();}async function upload() {const checkMd5Tip = message("正在校验文件的md5,请稍候", "info");await checkMd5(checkMd5Tip);sliceFile();const checkFragmentMd5Tip = message("正在校验分片文件的md5,请稍候", "info");await checkFragmentMd5(checkFragmentMd5Tip);for (let i = 0; i < data.fileList.length; i++) {if (data.fileList[i].isUpload) {continue;}for (let j = 0; j < data.fileList[i].fragmentList.length; j++) {if (data.fileList[i].fragmentList[j].percentage !== 100) {const onUploadProgress = (progressEvent) => {data.fileList[i].fragmentList[j].percentage = parseInt(Number(((progressEvent.loaded / progressEvent.total) * 100)).toFixed(0));data.fileList[i].fragmentList[j].completeSize = progressEvent.loaded / progressEvent.total * data.fileList[i].fragmentList[j].fragmentFile.size;updateTotalPercentage(i);};const formData = new FormData();formData.append("file", data.fileList[i].fragmentList[j].fragmentFile, data.fileList[i].fragmentList[j].name);postFileRequest("/fragment-info/upload?md5=" + data.fileList[i].fragmentList[j].md5, formData, onUploadProgress).then((res) => {if (res.data.code === 500) {message(res.data.msg, "error");}});}}}}async function checkMd5(checkMd5Tip) {const promises = [];const promisesCheckMd5 = [];for (let i = 0; i < data.fileList.length; i++) {promises.push(calculateMD5(data.fileList[i].file).then(md5 => {data.fileList[i].md5 = md5;promisesCheckMd5.push(getRequest("/file-info/checkMd5?md5=" + md5).then((res) => {if (res.data.code === 200) {data.fileList[i].percentage = 100;data.fileList[i].isUpload = true;data.fileList[i].transition = "none";data.fileList[i].totalCompleteSize = data.fileList[i].file.size;message(data.fileList[i].name + "文件上传完成", "success");checkUploadOver(i);}}));}));}await Promise.all(promises);await Promise.all(promisesCheckMd5);checkMd5Tip.close();}function sliceFile() {for (let i = 0; i < data.fileList.length; i++) {if (data.fileList[i].isUpload) {continue;}const fragmentCount = Math.floor(data.fileList[i].file.size / EACH_FILE) + 1;const fragmentList = [];for (let j = 0; j < fragmentCount; j++) {fragmentList.push({id: j,fragmentFile: data.fileList[i].file.slice(j * EACH_FILE, (j + 1) * EACH_FILE),completeSize: 0,name: data.fileList[i].name + "--分片" + (j + 1),percentage: 0,});}data.fileList[i].fragmentList = fragmentList;}}async function checkFragmentMd5(checkFragmentMd5Tip) {const promises = [];const promisesCheckMd5 = [];for (let i = 0; i < data.fileList.length; i++) {if (data.fileList[i].isUpload) {continue;}for (let j = 0; j < data.fileList[i].fragmentList.length; j++) {promises.push(calculateMD5(data.fileList[i].fragmentList[j].fragmentFile).then(md5 => {data.fileList[i].fragmentList[j].md5 = md5;promisesCheckMd5.push(getRequest("/fragment-info/checkMd5?md5=" + md5).then((res) => {if (res.data.code === 200) {data.fileList[i].fragmentList[j].percentage = 100;data.fileList[i].fragmentList[j].completeSize = data.fileList[i].fragmentList[j].fragmentFile.size;}}));}));}}await Promise.all(promises);await Promise.all(promisesCheckMd5);checkFragmentMd5Tip.close();}async function updateTotalPercentage(i) {let totalCompleteSize = 0;for (let j = 0; j < data.fileList[i].fragmentList.length; j++) {totalCompleteSize += data.fileList[i].fragmentList[j].completeSize;}data.fileList[i].totalCompleteSize = totalCompleteSize;data.fileList[i].percentage = parseInt(Number(data.fileList[i].totalCompleteSize / data.fileList[i].totalSize * 100).toFixed(0));if (data.fileList[i].percentage === 100) {if (!data.fileList[i].isUpload) {data.fileList[i].isUpload = true;message(data.fileList[i].name + "文件上传完成", "success");await generateFile(i);checkUploadOver(i);}}}async function generateFile(i) {const fragmentMd5List = [];for (let j = 0; j < data.fileList[i].fragmentList.length; j++) {fragmentMd5List.push(data.fileList[i].fragmentList[j].md5);}await postRequest("/file-info/generateFile", {name: data.fileList[i].name,md5: data.fileList[i].md5,fragmentMd5List: fragmentMd5List}).then((res) => {if (res.data.code === 500) {message(res.data.msg, "error");}});}function checkUploadOver() {let isOver = true;for (let i = 0; i < data.fileList.length; i++) {if (data.fileList[i].percentage !== 100) {isOver = false;break}}if (isOver) {data.isUploading = false;}}const pickerOpts = {excludeAcceptAllOption: false,multiple: true,};async function showFilePicker() {if (data.isUploading) {message("正在上传...", "info");return;}let fileHandle;try {fileHandle = await window.showOpenFilePicker(pickerOpts);data.fileList = [];data.isUploading = true;} catch (e) {if (e.name === 'AbortError' && e.message === 'The user aborted a request.') {message("用户没有选择文件", "info");return;} else {throw e;}}for (let i = 0; i < fileHandle.length; i++) {const file = await fileHandle[i].getFile();data.fileList.push({name: fileHandle[i].name,percentage: 0,file: file,totalSize: file.size,totalCompleteSize: 0,isUpload: false,});}await upload();}function showFragmentInfo(item) {data.showFragmentList = item.fragmentList;data.fragmentDialogVisible = true;}return {data,getDropItems,showFilePicker,showFragmentInfo,};},
};
</script><style>
* {padding: 0;margin: 0;box-sizing: border-box;
}.drop-area {margin: 100px auto 0;width: 800px;height: 180px;border: 1px dashed #dcdfe6;display: flex;align-items: center;justify-content: center;
}.drop-area:hover {border-color: #409eff;cursor: pointer;
}.icon-upload::before {display: flex;justify-content: center;font-size: 40px;margin: 10px 0;
}.tip-text {color: #606266;font-size: 14px;text-align: center;
}.tip-text em {color: #409eff;font-style: normal;
}.file-list {margin: 0 auto;width: 800px;
}.single-file {margin: 10px 0;
}
</style>
MyProgress.vue（由于我在测试的过程中发现，那个宽度会经常被卡住，所以我设置了transition属性，在秒传的时候就直接不过渡了）
<template><link rel="stylesheet" href="/style/css/iconfont.css"><div class="progress-container"><div class="bar"><div class="percentage" :style="{'width': props.percentage + '%', 'transition' : props.transition ? props.transition : 'width 0.2s linear'}"><span class="text-inside">{{ props.content + " " + props.percentage + "%" }}</span></div></div><div class="tip-content"><span v-show="props.percentage !== 100">{{ props.percentage + "%" }}</span><i class="iconfont icon-over" v-show="props.percentage === 100"/></div></div>
</template><script>
export default {props: ["percentage", "content", "transition"],setup(props) {return {props}}
}
</script><style scoped>
.progress-container {display: flex;height: 30px;cursor: pointer;border: 1px dashed #dcdfe6;padding: 0 10px;
}.bar {color: white;font-weight: 500;line-height: 30px;font-size: 14px;flex: 1;
}.percentage {border-radius: 30px;background-color: #67c23a;white-space: nowrap;word-break: break-all;overflow: hidden;
}.text-inside {padding-right: 10px;padding-left: 15px;float: right;
}.tip-content {padding: 0 10px;font-size: 16px;line-height: 30px;width: 40px;
}.icon-over::before {font-size: 24px;color: #67c23a;
}
</style>
util.js（生成md5字符串采用了 crypto-js 库，还是比较方便的）
import {ElMessage} from "element-plus";
import axios from "axios";
import {MD5} from 'crypto-js';const baseUrl = "http://127.0.0.1:8080"export function message(msg, type) {return ElMessage({message: msg,type: type,center: true,showClose: true,})
}export const getRequest = (url) => {return axios({method: 'get',url: baseUrl + url})
}export const postRequest = (url, data) => {return axios({method: 'post',url: baseUrl + url,data: data,})
}export const postFileRequest = (url, data, onUploadProgress) => {return axios({method: 'post',url: baseUrl + url,data: data,onUploadProgress: onUploadProgress,})
}export const calculateMD5 = (file) => {return new Promise(resolve => {const fileReader = new FileReader();fileReader.readAsBinaryString(file);fileReader.onloadend = event => {resolve(MD5(event.target.result).toString());}});
}export const EACH_FILE = 1024 * 1024 * 2;
后续开发说明
考虑到文章的篇幅，以及代码后面会多一些，我就都放到了Gitee上了，后面设计功能包括：之前写好的分片上传和秒传，下载部分也是设计成了分片下载，最后合并，不过还没有加上断点重下的功能实现；后面可以考虑结合浏览器自带的IndexDB数据库，然后实现该效果。
后面我尝试了一下，选择16字节的数组来存储32位MD5字符串转换后的结果是没问题的；然后我加上了一个简单的管理界面，来方便查看
效果预览
我简单测试了一下，还存在着不少的bug，主要有一些异常情况的处理，没有很完善；然后就是上传文件的数量限制和大小限制，没有进行很详细的设置；这方面可以再后面自主添加
源码下载
参见Gitee–在线网盘系统
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