JavaScript 前端实现文件上传 MD5 校验完整指南

import SparkMD5 from 'spark-md5';

import React, { Component } from 'react';
import SparkMD5 from 'spark-md5';
import { message, Button } from 'antd';
class Demo extends Component {
	constructor(props) {
        super(props);
        this.state = {
            loading: false,
            file: '',
            fileName: '',
        };
    }
	uploadFile = (e) => {
        const file = e.target.files[0];
        if (!file) {
            return;
        }
        let fileType = file.name.substring(file.name.lastIndexOf('.') + 1).toLowerCase();
        if (fileType !== 'xls' && fileType !== 'xlsx' && fileType !== 'xlsm') {
            message.error('模板文件格式错误，请重新上传');
            return false;
        }
        if(file.size > 80*1024*1024) {
            message.error('模板文件格式错误，请重新上传');
            return false;
        }
        this.setState({
            file: file,
            fileName: file.name,
        });
        this.md5Count(file);
    };
	//生成MD5
    md5Count (file) {
        let fileReader = new FileReader(),
            blobSlice =
                File.prototype.mozSlice ||
                File.prototype.webkitSlice ||
                File.prototype.slice,
            chunkSize = 2097152,
            // read in chunks of 2MB
            chunks = Math.ceil(file.size / chunkSize),
            currentChunk = 0,
            spark = new SparkMD5(),
            that = this;
        fileReader.onload = function (e) {
            spark.appendBinary(e.target.result);
            // append binary string
            currentChunk++;
            if (currentChunk < chunks) {
                loadNext();
            } else {
                let md = spark.end();
                that.setState({
                    fileMd5: md,
                    rcFile: file
                });
            }
        };
        function loadNext () {
            let start = currentChunk * chunkSize,
                end = start + chunkSize >= file.size ? file.size : start + chunkSize;
            fileReader.readAsBinaryString(blobSlice.call(file, start, end));
        }
        loadNext();
    }
	handleOk = () => {
        const { fileName, fileMd5, rcFile } = this.state;
        // this.setState({loading: true});
        let formData = new FormData();
        formData.append('fileName', fileName);
        formData.append('fileMd5', fileMd5);
        formData.append('rcFile', rcFile);
        let result = await httpClient.get(apis.uploadFile, {formData});
        ...略
    }
	
	render() {
		return(
			<div>
				<div className='c-upload'>
					<span className='red-star'>*</span>
					<a className='upload-file'>上传模板</a>
					<input
						type='file'
						className='upload-input'
						accept='.xls,.xlsx,.xlsm'
						onChange={this.uploadFile}
					/>
				</div>
				<Button type='primary' onClick={this.handleOk}>上传</Button>
			</div>
		)
	}
}
export default Demo;

npm install js-md5 -s

import md5 from 'js-md5' //引入
 
Vue.prototype.$md5 = md5;//添加

//可以将md5的参数拼到连接中,涉及到账号密码的信息可以通过该方法进行加密
//方法一，这个方法是将md5方法绑定在vue原型上的方法
let md5Params=this.$md5("xxxxxxxx");
//方法二，这个方法是将直接通过md5方法进行加密
let md5Params=md5("XXXXXX");