uni-app小程序开发-文件上传

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uni-app小程序开发-文件上传

前言

https://uniapp.dcloud.net.cn/api/request/network-file.html

选择图片

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uni.chooseImage({
	success: (chooseImageRes) => {
		const tempFilePaths = chooseImageRes.tempFilePaths;
	}
});

选择并上传

小程序不支持同时上传多张

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uni.chooseImage({
	success: (chooseImageRes) => {
		const tempFilePaths = chooseImageRes.tempFilePaths;
		uni.uploadFile({
			url: 'https://www.example.com/upload', //仅为示例，非真实的接口地址
			filePath: tempFilePaths[0],
      fileType:"image",
			name: 'file',
			formData: {
				'user': 'test'
			},
			success: (uploadFileRes) => {
				console.log(uploadFileRes.data);
			}
		});
	}
});

上传到阿里OSS

在 uni-app 小程序开发中，直接使用 ali-oss SDK 可能会面临一些兼容性和环境问题，建议使用 REST API 进行操作，这样可以保证在小程序环境中的兼容性。

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const host = '<host>';
const signature = '<signatureString>';
const ossAccessKeyId = '<accessKey>'; 
const policy = '<policyBase64Str>';
const securityToken = '<x-oss-security-token>';
const key = '<object name>'

uni.chooseImage({
  chooseImage: 1,
  success: res => {
    const path = res.apFilePaths[0];

  }
});

文件上传

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uni.uploadFile({
  url: host,
  fileType: 'image',
  name: 'file',
  filePath: path,
  formData: {
    key,
    policy,
    OSSAccessKeyId: ossAccessKeyId,
    signature,
    success_action_status: '200',
    // 使用STS签名时传入securityToken。
    'x-oss-security-token': securityToken 
  },
  success: (res) => {
    // 将上传成功状态码设置为200，默认状态码为204。
    if (res.statusCode === 200) {
      console.log('上传成功');
    }
  },
  fail: err => {
    console.log(err);
  }
});

完全本地方案

小程序前端生成验证的签名，前端上传到阿里OSS。

需要把上传阿里的地址添加到小程序的白名单中。

但是不建议这样做，还是建议密钥一类的放在后端处理。

加密工具类

加密

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npm install crypto-js --save

base64.js

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export const Base64 = {
  // private property
  _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

  // public method for encoding
  encode : function (input) {
    var output = "";
    var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
    var i = 0;

    input = Base64._utf8_encode(input);

    while (i < input.length) {

      chr1 = input.charCodeAt(i++);
      chr2 = input.charCodeAt(i++);
      chr3 = input.charCodeAt(i++);

      enc1 = chr1 >> 2;
      enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
      enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
      enc4 = chr3 & 63;

      if (isNaN(chr2)) {
        enc3 = enc4 = 64;
      } else if (isNaN(chr3)) {
        enc4 = 64;
      }

      output = output +
        this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
        this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

    }

    return output;
  },

  // public method for decoding
  decode : function (input) {
    var output = "";
    var chr1, chr2, chr3;
    var enc1, enc2, enc3, enc4;
    var i = 0;

    input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

    while (i < input.length) {

      enc1 = this._keyStr.indexOf(input.charAt(i++));
      enc2 = this._keyStr.indexOf(input.charAt(i++));
      enc3 = this._keyStr.indexOf(input.charAt(i++));
      enc4 = this._keyStr.indexOf(input.charAt(i++));

      chr1 = (enc1 << 2) | (enc2 >> 4);
      chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
      chr3 = ((enc3 & 3) << 6) | enc4;

      output = output + String.fromCharCode(chr1);

      if (enc3 != 64) {
        output = output + String.fromCharCode(chr2);
      }
      if (enc4 != 64) {
        output = output + String.fromCharCode(chr3);
      }

    }

    output = Base64._utf8_decode(output);

    return output;

  },

  // private method for UTF-8 encoding
  _utf8_encode : function (string) {
    string = string.replace(/\r\n/g,"\n");
    var utftext = "";

    for (var n = 0; n < string.length; n++) {

      var c = string.charCodeAt(n);

      if (c < 128) {
        utftext += String.fromCharCode(c);
      }
      else if((c > 127) && (c < 2048)) {
        utftext += String.fromCharCode((c >> 6) | 192);
        utftext += String.fromCharCode((c & 63) | 128);
      }
      else {
        utftext += String.fromCharCode((c >> 12) | 224);
        utftext += String.fromCharCode(((c >> 6) & 63) | 128);
        utftext += String.fromCharCode((c & 63) | 128);
      }

    }

    return utftext;
  },

  // private method for UTF-8 decoding
  _utf8_decode : function (utftext) {
    var string = "";
    var i = 0;
    var c = c1 = c2 = 0;

    while ( i < utftext.length ) {

      c = utftext.charCodeAt(i);

      if (c < 128) {
        string += String.fromCharCode(c);
        i++;
      }
      else if((c > 191) && (c < 224)) {
        c2 = utftext.charCodeAt(i+1);
        string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
        i += 2;
      }
      else {
        c2 = utftext.charCodeAt(i+1);
        c3 = utftext.charCodeAt(i+2);
        string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
        i += 3;
      }

    }

    return string;
  }

}

上传工具类

上传

/static/js/alioss_upload.js

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import CryptoJS from 'crypto-js';
import {
	Base64
} from '@/static/utils/base64.js';

let config = {
	accessid: 'LTAxxxxxxxbSCf',
	accesskey: 'XwxxxxxxxZhCB',
	osshost: 'https://xxxx.oss-cn-qingdao.aliyuncs.com/'
}

export function getOSS() {
	let date = new Date()
	date = date.setHours(date.getHours() + 1)
	let extime = "" + new Date(date).toISOString()
	var policyText = {
		"expiration": extime, //设置该Policy的失效时间，超过这个失效时间之后，就没有办法通过这个policy上传文件了
		"conditions": [
			["content-length-range", 0, 1024 * 1024 * 100] // 设置上传文件的大小限制 
		]
	};
	let policyBase64 = Base64.encode(JSON.stringify(policyText))
	var signature = CryptoJS.HmacSHA1(policyBase64, config.accesskey).toString(CryptoJS.enc.Base64);
	var timetamp = new Date().getTime();
	return {
		host: config.osshost,
		accessid: config.accessid,
		policyBase64: policyBase64,
		signature: signature,
	}
}

export function uploadFileToAliOss(path, savePath) {
	let OSS = getOSS();
	console.log('开始上传')
	let self = this;
	return new Promise((resolve, reject) => {
		uni.uploadFile({
			url: OSS.host,
			filePath: path,
			fileType: 'image',
			name: 'file',
			formData: {
				'key': savePath,
				'OSSAccessKeyId': OSS.accessid,
				'success_action_status': '200',
				'policy': OSS.policyBase64,
				'signature': OSS.signature,
			},
			success: (res) => {
				console.log(res.data)
				uni.showToast({
					title: '上传成功',
					icon: 'success',
					duration: 1000
				});
				console.log(OSS.host + savePath)
				resolve('suc');
			},
			fail: (err) => {
				console.log('upload fail', err);
				uni.showModal({
					content: err.errMsg,
					showCancel: false
				});
				reject('err')
			}
		});
	})
}

生成保存位置

引用的生成UUID的库大都不支持小程序。

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function generateUUID() {
	var d = new Date().getTime(); //Timestamp
	var d2 = (performance && performance.now && (performance.now() * 1000)) || 0;
	return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
		var r = Math.random() * 16; //random number between 0 and 16
		if (d > 0) { //Use timestamp until depleted
			r = (d + r) % 16 | 0;
			d = Math.floor(d / 16);
		} else { //Use microseconds since page-load if supported
			r = (d2 + r) % 16 | 0;
			d2 = Math.floor(d2 / 16);
		}
		return (c === 'x' ? r : (r & 0x3 | 0x8)).toString(16);
	});
}

function getDateStr() {
	const now = new Date()
	const year = now.getFullYear()
	const month = now.getMonth() + 1
	const day = now.getDate()
	const formattedMonth = month.toString().padStart(2, '0')
	const formattedDay = day.toString().padStart(2, '0')
	return `${year}-${formattedMonth}-${formattedDay}`
}

export const getSavePath = (filePath) => {
	let fileName = filePath.split('/').pop()
	fileName = fileName.replace(/[^a-zA-Z0-9_.-]/g, '')
	let uuidStr = generateUUID()
	return `cxz_mp/imgs/${getDateStr()}/${uuidStr}-${fileName}`;
}