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这篇文章主要介绍了又拍云 Node.js 实现文件上传、删除功能，代码简单易懂，非常不错，具有一定的参考借鉴价值,需要的朋友可以参考下
Node.js 服务端
使用 Node.js + Express.js 实现 服务端
const express = require("express");
const app = express();
const axios = require('axios');
app.set('port', process.env.PORT || 8082);
// 静态资源目录，这里放在了根目录，生产环境不允许这样
app.use(express.static(__dirname));
// 启动一个端口为 8082 的服务器
app.listen(app.get('port'), () => {
console.log("http://localhost:" + app.get('port'));
});
准备 Base64、HMAC-SHA1、MD5 实现签名认证
详见：http://docs.upyun.com/api/authorization/
const crypto = require("crypto");
// MD5
function MD5(value) {
return crypto
.createHash("md5")
.update(value)
.digest("hex");
}
// Base64
function base64(value) {
return Buffer.from(value).toString("base64");
}
// hmacsha1
function hmacsha1(secret, value) {
return crypto.createHmac('sha1', secret).update(value, 'utf-8').digest().toString('base64');
}
上传、删除接口
const date = new Date().toGMTString();
const bucketname = ""; // 空间名
const key = ""; // 操作员
const secret = ""; // 密码
const upyunUrl = 'http://v0.api.upyun.com/'
// Upload
app.get("/api/token/upload", (req, res) => {
let fileName = (Math.random() * 100000000) >>> 0;
let expiration = ((Date.now() / 1000) >>> 0) + 30 * 60; // 请求的过期时间，UNIX UTC 时间戳，单位秒。建议设为 30 分钟 http://docs.upyun.com/api/form_api/
let method = "POST";
let policy = base64(
JSON.stringify({
bucket: bucketname,
// "save-key": "/" + fileName + "{.suffix}",
"save-key": "/{filename}{.suffix}",
expiration: expiration
})
);
let authorization =
"UPYUN " +
key +
":" +
hmacsha1(MD5(secret), method + "&/" + bucketname + "&" + policy);
res.json({
msg: "OK",
code: 200,
data: {
authorization: authorization,
policy: policy
}
});
});
// Delete
app.get('/api/token/del', (req, res) => {
let item = req.query.item;
let method = "DELETE"
let authorization = "UPYUN " +
key +
":" +
hmacsha1(MD5(secret), method + '&/' + bucketname + item + '&'+ date);
axios({
url: upyunUrl + bucketname + item,
method: 'DELETE',
headers: {
'Authorization': authorization,
'Date': date
}
}).then(response => {
res.json({
msg: "OK",
code: 200,
data: {}
});
}).catch(err => {
console.log('err', err)
})
})
跨域接口调用
const cors = require('cors');
// CORS @see https://github.com/expressjs/cors
app.use(cors());
前端
前端使用 Vue.js 实现
引入 Bootstrap.css
<link rel="stylesheet" type="text/css" href="https://unpkg.com/bootstrap@4.1.3/dist/css/bootstrap.css">
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<!-- HTML -->
<div id="app">
<div class="card" style="margin: 50px auto; width: 300px;">
<div class="card-body">
<h5 class="card-title">UPYun Upload & Delete</h5>
<div class="card-text">
<div class="form-group">
<label for="file">Upload</label>
<input type="file" id="file" class="form-control-file" @change="onChange">
<div class="form-text text-muted">
<ul>
<li v-for="(item, index) in files">
{{item}} <a href="javascript:;" rel="external nofollow" @click="onDel(item, index)">Del</a>
</li>
</ul>
</div>
</div>
</div>
</div>
</div>
</div>
引入 Vue.js、Axios
<script src="https://unpkg.com/vue@2.5.17/dist/vue.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
JS
const upUrl = 'http://v0.api.upyun.com/' // +空间名，如：http://v0.api.upyun.com/yun-temp
const baseApi = 'http://localhost:8082/api/'
let uploadInput;
let app = new Vue({
el: '#app',
data: {
files: []
},
methods: {
onChange: function () {
getToken(token => {
let formData = new FormData();
formData.append("file", uploadInput.files[0])
formData.append('policy', token.policy)
formData.append("authorization", token.authorization)
axios({
method: 'POST',
url: upUrl,
data: formData
}).then(res => {
res = res || {}
if (res.status !== 200) {
console.log('error')
return
}
let data = res.data || {}
this.files.push(data.url)
alert('Success')
}).catch(err => {
console.log(err);
});
});
},
onDel: function (item, index) {
this.files.splice(index, 1)
axios.request({
url: baseApi + 'token/del',
method: 'GET',
params: {
item: encodeURI(item)
}
}).then(res => {
alert('Deleted.')
}).catch(err => {
console.log(err)
})
}
},
mounted () {
uploadInput = $('file')
}
})
// DOM 获取元素
function $ (el) {
return document.getElementById(el)
}
// 获取 token
function getToken (fn) {
let token = window.localStorage.getItem('token');
token = JSON.parse(token) || {};
let nowTime = Date.now();
if (nowTime < token.expired && token.authorization && token.policy) {
fn(token)
return
}
axios({
method: 'get',
url: baseApi + 'token/upload'
})
.then(res => {
let data = res.data || {}
data = data.data || {}
const authorization = data.authorization
const policy = data.policy
const expired = ((Date.now() / 1000) >>> 0) + 30 * 60;
token = {
authorization,
policy,
expired
}
fn(token)
window.localStorage.setItem('token', JSON.stringify(token))
});
}
项目源码
https://github.com/givebest/UPyun-upload-delete-node.js
总结
以上所述是小编给大家介绍的又拍云 Node.js 实现文件上传、删除，希望对大家有所帮助，如果大家有任何疑问欢迎给我留言，小编会及时回复大家的！ | 
发表于 2018-10-28 09:22:14
