说明：使用axios方式上传，文件不能过大，因为过多的连续Ajax请求会使后台崩溃，接口报错；
录屏.gif
第一步：使用input或者antd_upload获取文件
image.png
第二步：调接口获取文件段数，分段列表和分段尺寸；使用slice方法，分段读取文件为blob
let dataMsg = await createMultipart({
fileSize: file.size, // 传参数
filename: file.name
}).then(
(rem) => {
return rem.data;
},
(err) => {
return upFailed(file, onUpload); // 如果接口报错，使用upFailed方法处理
}
);
let urlList = dataMsg?.parts || []; // 分段列表
let DEFAULT_SIZE = dataMsg?.partSize; // 分段尺寸
for (let i = 0; i < urlList.length; i++) {
let url = urlList[i]['url'];
let fname = encodeURIComponent(file.name);
let start = i * DEFAULT_SIZE;
let stepFile;
if (i === urlList.length - 1) {
// 使用slice方法，分段读取文件为blob
stepFile = file.slice(start, -1); // 如果是最后一段，直接截取剩下的所有内容
} else {
stepFile = file.slice(start, start + DEFAULT_SIZE); // 分割文件
}
urlList[i]['stepFile'] = stepFile;
urlList[i]['fname'] = fname;
urlList[i]['uid'] = file.uid;
}
urlList已准备好
image.png
数据说明： {
fname: '使用encodeURIComponent 编码过的文件名',
partNumber: '段数序号,合并时候使用',
stepFile: '截取的文件'
uid: 'antd组件生成的文件唯一值',
url: '上传该段文件的路径'
};
第三步：循环urlList，上传每一段文件
准备工作：单个文件上传方法
const detalItem = ({ url, stepFile, fname, partNumber }) => {
return new Promise((resolve, reject) => {
fileAxios({
url,
method: 'PUT',
data: stepFile,
headers: {
'Content-Type': '',
'Content-disposition': `filename*=utf-8\'zh_cn\'${fname}`
}
})
.then((res) => {
let str = res.headers.etag.split('"').join('');
resolve({ eTag: str, partNumber });
})
.catch((err) => {
reject({ eTag: '', partNumber });
});
});
};
准备工作：并发上传，控制每次上传的接口数量，防止上传接口数量过多，浏览器崩溃。
参数说明：
poolLimit（数字类型）：表示限制的并发数；
array（数组类型）：表示任务数组；
iteratorFn（函数类型）：表示迭代函数，用于实现对每个任务项进行处理，该函数会返回一个 Promise 对象或异步函数；
onUpload: 进度条
async function asyncPool(poolLimit, array, iteratorFn, onUpload) {
const ret = []; // 存储所有的异步任务
const executing = []; // 存储正在执行的异步任务
for (const item of array) {
// 结束运行
if (endExecution.end && endExecution.uid === item?.uid) {
return;
}
--------重点开始---------------
// 调用iteratorFn函数创建异步任务
const p = Promise.resolve().then(() => iteratorFn(item, array));
ret.push(p); // 保存新的异步任务
// 当poolLimit值小于或等于总任务个数时，进行并发控制
if (poolLimit <= array.length) {
// 当任务完成后，从正在执行的任务数组中移除已完成的任务
const e = p.then(() => executing.splice(executing.indexOf(e), 1));
executing.push(e); // 保存正在执行的异步任务
if (executing.length >= poolLimit) {
await Promise.race(executing); // 等待较快的任务执行完成
}
}
--------重点结束---------------
// 进度条
onUpload &&
onUpload({
loaded: ret.length < array.length ? ret.length : ret.length - 1, // 等到接口合并完成，再返回100%
total: array.length,
uid: item['uid'],
endAction: endAction // 如果用户删除文件，调用此函数，结束文件上传
}); // 进度条
}
return Promise.all(ret); // 集合多个返回结果
}
整合方法，开始上传
let etags = [];
try {
etags = await asyncPool(5, urlList, detalItem, onUpload); // 重点
} catch {
// 上传失败
etags = [];
endExecution.end = true;
endExecution.uid = file?.uid;
file['url'] = '';
file['link'] = '';
file['attachmentID'] = '';
return upFailed(file, onUpload);
}
请求中，保证5条并发数，如果5条中有请求结束了，自动补上
image.png
创建请求，请求全部发出，结束后合并文件
image.png
文件上传完的结果，etags。
eTag是每段文件的唯一值，
partNumber： 文件顺序。后端根据这个数据表来合并文件，避免顺序乱了。
image.png
第四步： 通知后端，合并文件
let params = {
attachmentID: dataMsg?.attachmentID,
uploadID: dataMsg?.uploadID
};
if (endExecution.end && endExecution.uid === file?.uid) {
console.log('删除文件，结束上传，调用结束上传接口，后端清除已经上传的数据');
cancelMultipart(params);
file['url'] = '';
file['link'] = '';
file['attachmentID'] = '';
return { file: file, upResult: '' };
}
--------重点开始---------------
result = await completeMultipart({
...params,
etags
});
if (etags) {
onUpload &&
onUpload({
loaded: 100,
total: 100,
uid: file['uid'],
endAction: endAction
}); // 进度条
}
let presignedURL = result?.data?.presignedURL;
// console.log('result', result, 'presignedURL', presignedURL);
file['url'] = presignedURL;
file['link'] = presignedURL;
file['attachmentID'] = dataMsg?.attachmentID;
file['status'] = 'done';
--------重点结束---------------
return { file: file, upResult: '' };
附加功能：
1 返回进度条onUpload，原理： 当前发出去的请求数，除以总条数
2 结束请求endAction，应用场景，文件正在上传中，删除文件，结束接口调用
全部代码：
React上传组件：
import React, { Component } from 'react';
import { Upload, Progress, Tooltip, Modal } from 'antd';
const { Dragger } = Upload;
export default class List extends Component {
constructor(props) {
super(props);
this.state = {
fileList: [
// {
// uid: '-1',
// name: 'image.png',
// status: 'done',
// url:
// 'https://zos.alipayobjects.com/rmsportal/jkjgkEfvpUPVyRjUImniVslZfWPnJuuZ.png'
// }
],
visible: false,
upLoading: false
};
this.formRef = React.createRef();
this.littleRef = React.createRef();
this.departmentRef = React.createRef();
this.smalledepartmentRef = React.createRef();
}
// 进度条
handleProgress = (progressEvent) => {
const num = (progressEvent.loaded / progressEvent.total) * 100;
let percent = num >= 100 ? 100 : num.toFixed(2) * 1;
const { fileList } = this.state;
this[`${progressEvent?.uid}_up`] = progressEvent;
// if (progressEvent.loaded > 5) {
// progressEvent.endAction();
// }
this.setState({
fileList: fileList.map((p) => {
if (p?.uid === progressEvent?.uid) {
p['percent'] = percent;
}
return p;
})
});
};
// 删除文件
onRemove = (file) => {
if (!file?.status) {
// 删除正在上传的文件，结束调用
this[`${file?.uid}_up`] &&
this[`${file?.uid}_up`]?.endAction &&
this[`${file?.uid}_up`]?.endAction(file?.uid);
}
const { fileList } = this.state;
let newList = fileList.filter((p) => p.uid !== file.uid);
let loading = false;
for (let v of newList) {
if (!v?.status) {
loading = true;
break;
}
}
this.setState({
fileList: newList,
upLoading: loading
});
};
beforeUpload = (file, fileLists) => {
console.log('打印file：', file);
let repeat = [...this.state.fileList, ...fileLists];
let obj = {};
let noRepeat = repeat.reduce((pur, item) => {
if (!obj[item?.uid]) {
obj[item?.uid] = true;
pur.push(item);
}
return pur;
}, []);
this.setState({ fileList: noRepeat, upLoading: true });
commonUpload({ file, onUpload: this.handleProgress })
.then((rem) => {
const { fileList } = this.state;
var data = {};
for (var key in rem.file) {
data[key] = rem.file[key];
}
let newFilelist = fileList
.map((p) => {
if (p) {
if (p?.uid === data?.['uid']) {
p = { ...p, ...data };
}
return p;
}
})
.filter((p) => p?.status !== 'error');
if (isNotEmpty(rem.file)) {
this.setState({
fileList: newFilelist
});
}
})
.finally(() => {
const { fileList } = this.state;
// 批量上传完成，关闭loading
let flag = true;
for (let item of fileList) {
if (!item?.status) {
flag = false;
break;
}
}
flag && this.setState({ upLoading: false });
// console.log('this.state.fqwFile', JSON.parse(this.state.fqwFile));
});
// 阻止默认上传
return false;
};
render(){
<Dragger
fileList={fileList}
className="drag-uploader"
onPreview={this.handlePreview} // 点击文件链接或预览图标时的回调
onRemove={this.onRemove}
multiple={true} // 支持多个文件一起上传
// onChange={this.onfileChange}
itemRender={(originNode, file, currFileList) => (
<UploadListItem
originNode={originNode}
file={file}
currFileList={currFileList}
fileList={fileList}
/>
)}
beforeUpload={this.beforeUpload}
showUploadList={{
showPreviewIcon: false,
downloadIcon: true
}}
>
{fileList.length >= 15 ? null : UploadButton}
</Dragger>
}
进度条uploadListItem.jsx文件
/*
* @desc 文件上传，自定义上传列表项, 带进度条
* @author fqw
*/
import React, { Component } from 'react';
import { Progress, Tooltip } from 'antd';
import Cns from 'classnames';
import './index.scss';
const UploadListItem = ({ originNode, file, current, fileList }) => {
const errorNode = <Tooltip title={file['response']}>{originNode.props.children}</Tooltip>;
let have = file.percent < 100;
return (
<div
className={Cns('ant-upload-draggable-list-item', have && 'progressIng')}
style={{ cursor: 'move' }}
key={file.percent}
>
{file.status === 'error' ? errorNode : originNode}
{have && <Progress style={{ width: '100px' }} percent={file.percent} />}
</div>
);
};
export default UploadListItem;
fileAxios.js文件
import { message } from 'antd';
import axios from 'axios';
import { cancelMultipart } from './common';
import {
getUserPresignedurl,
submitFileMsg,
createMultipart,
completeMultipart
} from 'services/common';
// 结束运行
let endExecution = {
end: false,
uid: ''
};
let endAction = (uid) => {
endExecution.end = true;
endExecution.uid = uid;
};
let upFailed = (file, onUpload) => {
endExecution.end = true;
endExecution.uid = file?.uid;
file['status'] = 'error';
file['response'] = '上传失败，请重试';
message.warning({
content: `文件 ${file.name} 上传失败，请重试`,
duration: 5
});
onUpload &&
onUpload({
loaded: 1, // 结束进度条，不显示
total: 1,
uid: file['uid'],
endAction: endAction
}); // 进度条
return { file, upResult: false };
};
// 普通上传
const uploadFile = async (file, onUpload) => {
// 获取上传接口的路径
let urlRest = await getUserPresignedurl({ filename: file.name, fileSize: file.size }).then(
(rem) => {
if (rem.status === 200) {
// file['uid'] = rem.data['attachmentID'];
file = Object.assign(file, rem.data);
return rem.data;
}
}
);
// 获取文件类型
let fileType = file.name.split('.').slice(-1)[0];
let typesObj = {
jpg: 'image/jpeg',
jpe: 'image/jpeg',
jpeg: 'image/jpeg',
png: 'image/png',
gif: 'image/gif',
bmp: 'application/x-bmp',
wbmp: 'image/vnd.wap.wbmp',
ico: 'image/x-icon',
pdf: 'application/pdf',
ppt: 'application/x-ppt',
doc: 'application/msword',
xls: 'application/vnd.ms-excel'
};
let url = urlRest.presignedURL;
const fileAxios = axios.create();
let fname = encodeURIComponent(file.name);
let upBool = false;
upBool = await fileAxios({
url,
method: 'PUT',
data: file,
headers: {
'Content-Type': typesObj[fileType] || '',
'Content-disposition': `filename*=utf-8\'zh_cn\'${fname}`
},
onUploadProgress: (arg) => {
arg.uid = file.uid;
onUpload(arg);
}
})
.then((res) => {
return res.status === 200;
})
.catch((err) => {
return false;
});
// 上传失败，结束运行
if (!upBool) {
return upFailed(file, onUpload);
}
// 获取文件下载或预览链接
let upResult = await submitFileMsg({
filename: file.name,
fileSize: file.size,
attachmentID: urlRest.attachmentID
}).then(
(rem) => {
file['url'] = rem.data['link'];
file['status'] = 'done';
file['attachmentID'] = urlRest.attachmentID;
file = Object.assign(file, rem.data);
return true;
},
(err) => {
return false;
}
);
let copy = JSON.parse(JSON.stringify(file));
copy['name'] = file.name;
return { file: copy, upResult };
};
// poolLimit（数字类型）：表示限制的并发数；
// array（数组类型）：表示任务数组；
// iteratorFn（函数类型）：表示迭代函数，用于实现对每个任务项进行处理，该函数会返回一个 Promise 对象或异步函数
// onUpload: 进度条
async function asyncPool(poolLimit, array, iteratorFn, onUpload) {
const ret = []; // 存储所有的异步任务
const executing = []; // 存储正在执行的异步任务
for (const item of array) {
// 结束运行
if (endExecution.end && endExecution.uid === item?.uid) {
console.log('结束上传0');
return;
}
// 调用iteratorFn函数创建异步任务
const p = Promise.resolve().then(() => iteratorFn(item, array));
ret.push(p); // 保存新的异步任务
// 当poolLimit值小于或等于总任务个数时，进行并发控制
if (poolLimit <= array.length) {
// 当任务完成后，从正在执行的任务数组中移除已完成的任务
const e = p.then(() => executing.splice(executing.indexOf(e), 1));
executing.push(e); // 保存正在执行的异步任务
if (executing.length >= poolLimit) {
await Promise.race(executing); // 等待较快的任务执行完成
}
}
onUpload &&
onUpload({
loaded: ret.length < array.length ? ret.length : ret.length - 1, // 等到接口合并完成，再返回100%
total: array.length,
uid: item['uid'],
endAction: endAction
}); // 进度条
}
return Promise.all(ret);
}
// 分段上传
const multiPartUpload = async (file, onUpload = null) => {
// 获取段数
let dataMsg = await createMultipart({
fileSize: file.size, // 传参数
filename: file.name
}).then(
(rem) => {
return rem.data;
},
(err) => {
return upFailed(file, onUpload); // 如果接口报错，使用upFailed方法处理
}
);
let urlList = dataMsg?.parts || []; // 分段列表
let DEFAULT_SIZE = dataMsg?.partSize; // 分段尺寸
for (let i = 0; i < urlList.length; i++) {
let url = urlList[i]['url'];
let fname = encodeURIComponent(file.name);
let start = i * DEFAULT_SIZE;
let stepFile;
if (i === urlList.length - 1) {
stepFile = file.slice(start, -1); // 如果是最后一段的话，直接截取剩下的所有内容
} else {
stepFile = file.slice(start, start + DEFAULT_SIZE); // 分割文件
}
urlList[i]['stepFile'] = stepFile;
urlList[i]['fname'] = fname;
urlList[i]['uid'] = file.uid;
}
const fileAxios = axios.create();
const detalItem = ({ url, stepFile, fname, partNumber }) => {
return new Promise((resolve, reject) => {
fileAxios({
url,
method: 'PUT',
data: stepFile,
headers: {
'Content-Type': '',
'Content-disposition': `filename*=utf-8\'zh_cn\'${fname}`
}
})
.then((res) => {
let str = res.headers.etag.split('"').join('');
resolve({ eTag: str, partNumber });
})
.catch((err) => {
reject({ eTag: '', partNumber });
});
});
};
let etags = [];
try {
etags = await asyncPool(5, urlList, detalItem, onUpload);
} catch {
// 上传失败
etags = [];
endExecution.end = true;
endExecution.uid = file?.uid;
file['url'] = '';
file['link'] = '';
file['attachmentID'] = '';
return upFailed(file, onUpload);
}
let params = {
attachmentID: dataMsg?.attachmentID,
uploadID: dataMsg?.uploadID
};
if (endExecution.end && endExecution.uid === file?.uid) {
cancelMultipart(params);
file['url'] = '';
file['link'] = '';
file['attachmentID'] = '';
return { file: file, upResult: '' };
}
let result = null;
// console.log('etags', etags);
// 上传完合并文件
try {
result = await completeMultipart({
...params,
etags
});
if (etags) {
onUpload &&
onUpload({
loaded: 100,
total: 100,
uid: file['uid'],
endAction: endAction
}); // 进度条
}
let presignedURL = result?.data?.presignedURL;
// console.log('result', result, 'presignedURL', presignedURL);
file['url'] = presignedURL;
file['link'] = presignedURL;
file['attachmentID'] = dataMsg?.attachmentID;
file['status'] = 'done';
} catch {
file['url'] = '';
file['link'] = '';
file['attachmentID'] = '';
return upFailed(file, onUpload);
}
let copy = JSON.parse(JSON.stringify(file));
copy['name'] = file.name;
return { file: copy, upResult: '' };
};
export const commonUpload = ({ file, onUpload }) => {
let fileSize = 100; // 100M
if (file.size / 1024 / 1024 > fileSize) {
// 当文件大于100M采用分段上传;
return multiPartUpload(file, onUpload);
} else {
return uploadFile(file, onUpload);
}
};
网友评论