这篇文章主要介绍了微信小程序环境下如何将文件上传到OSS,具有一定借鉴价值,感兴趣的朋友可以参考下,希望大家阅读完这篇文章之后大有收获,下面让小编带着大家一起了解一下。
步骤 1: 配置 Bucket 跨域
客户端进行表单直传到 OSS 时,会从浏览器向 OSS 发送带有 Origin 的请求消息。OSS 对带有 Origin 头的请求消息会进行跨域规则(CORS)的验证。因此需要为 Bucket 设置跨域规则以支持 Post 方法。
步骤 2:配置外网域名到小程序的上传域名白名单中
通过 OSS 控制台查看外网域名。
登录微信小程序平台,配置小程序的上传域名白名单。
步骤 3:使用 Web 端直传实践方案 Demo 进行上传测试
下载应用服务器代码
修改 Demo 中 upload.js 的密钥和地址。
进行上传测试。
获取上传需要的签名(signature)和加密策略(policy)
使用微信小程序上传图片
使用 chooseImage API 进行图片选择,然后调用 uploadFile 进行文件上传
帮助文档
upload.js
accessid= '';
accesskey= '';
host = '';
g_dirname = ''
g_object_name = ''
g_object_name_type = ''
now = timestamp = Date.parse(new Date()) / 1000;
var policyText = {
"expiration": "2020-01-01T12:00:00.000Z", //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, 1048576000] // 设置上传文件的大小限制
]
};
var policyBase64 = Base64.encode(JSON.stringify(policyText))
message = policyBase64
var bytes = Crypto.HMAC(Crypto.SHA1, message, accesskey, { asBytes: true }) ;
var signature = Crypto.util.bytesToBase64(bytes);
function check_object_radio() {
var tt = document.getElementsByName('myradio');
for (var i = 0; i < tt.length ; i++ )
{
if(tt[i].checked)
{
g_object_name_type = tt[i].value;
break;
}
}
}
function get_dirname()
{
dir = document.getElementById("dirname").value;
if (dir != '' && dir.indexOf('/') != dir.length - 1)
{
dir = dir + '/'
}
//alert(dir)
g_dirname = dir
}
function random_string(len) {
len = len || 32;
var chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';
var maxPos = chars.length;
var pwd = '';
for (i = 0; i < len; i++) {
pwd += chars.charAt(Math.floor(Math.random() * maxPos));
}
return pwd;
}
function get_suffix(filename) {
pos = filename.lastIndexOf('.')
suffix = ''
if (pos != -1) {
suffix = filename.substring(pos)
}
return suffix;
}
function calculate_object_name(filename)
{
if (g_object_name_type == 'local_name')
{
g_object_name += "${filename}"
}
else if (g_object_name_type == 'random_name')
{
suffix = get_suffix(filename)
g_object_name = g_dirname + random_string(10) + suffix
}
return ''
}
function get_uploaded_object_name(filename)
{
if (g_object_name_type == 'local_name')
{
tmp_name = g_object_name
tmp_name = tmp_name.replace("${filename}", filename);
return tmp_name
}
else if(g_object_name_type == 'random_name')
{
return g_object_name
}
}
function set_upload_param(up, filename, ret)
{
g_object_name = g_dirname;
if (filename != '') {
suffix = get_suffix(filename)
calculate_object_name(filename)
}
new_multipart_params = {
'key' : g_object_name,
'policy': policyBase64,
'OSSAccessKeyId': accessid,
'success_action_status' : '200', //让服务端返回200,不然,默认会返回204
'signature': signature,
};
up.setOption({
'url': host,
'multipart_params': new_multipart_params
});
up.start();
}
var uploader = new plupload.Uploader({
runtimes : 'html5,flash,silverlight,html4',
browse_button : 'selectfiles',
//multi_selection: false,
container: document.getElementById('container'),
flash_swf_url : 'lib/plupload-2.1.2/js/Moxie.swf',
silverlight_xap_url : 'lib/plupload-2.1.2/js/Moxie.xap',
url : 'http://oss.aliyuncs.com',
init: {
PostInit: function() {
document.getElementById('ossfile').innerHTML = '';
document.getElementById('postfiles').onclick = function() {
set_upload_param(uploader, '', false);
return false;
};
},
FilesAdded: function(up, files) {
plupload.each(files, function(file) {
document.getElementById('ossfile').innerHTML += '<div id="' + file.id + '">' + file.name + ' (' + plupload.formatSize(file.size) + ')<b></b>'
+'<div class="progress"><div class="progress-bar" ></div></div>'
+'</div>';
});
},
BeforeUpload: function(up, file) {
check_object_radio();
get_dirname();
set_upload_param(up, file.name, true);
},
UploadProgress: function(up, file) {
var d = document.getElementById(file.id);
d.getElementsByTagName('b')[0].innerHTML = '<span>' + file.percent + "%</span>";
var prog = d.getElementsByTagName('div')[0];
var progBar = prog.getElementsByTagName('div')[0]
progBar.style.width= 2*file.percent+'px';
progBar.setAttribute('aria-valuenow', file.percent);
},
FileUploaded: function(up, file, info) {
if (info.status == 200)
{
document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = 'upload to oss success, object name:' + get_uploaded_object_name(file.name);
}
else
{
document.getElementById(file.id).getElementsByTagName('b')[0].innerHTML = info.response;
}
},
Error: function(up, err) {
document.getElementById('console').appendChild(document.createTextNode("\nError xml:" + err.response));
}
}
});
uploader.init();
index.html
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<title>OSS web直传</title>
<link rel="stylesheet" type="text/css" href="style.css"/>
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">
</head>
<body>
<h3>OSS web直传---直接在JS签名</h3>
<ol>
<li>基于plupload封装 </li>
<li>支持html5,flash,silverlight,html4 等协议上传</li>
<li>可以运行在PC浏览器,手机浏览器,微信</li>
<li>可以选择多文件上传</li>
<li>显示上传进度条</li>
<li>可以控制上传文件的大小</li>
<li>最关键的是,让你10分钟之内就能移植到你的系统,实现以上牛逼的功能!</li>
<li>注意一点,bucket必须设置了Cors(Post打勾),不然没有办法上传</li>
<li>注意一点,把upload.js 里面的host/accessid/accesskey改成您上传所需要的信息即可</li>
<li>此方法是直接在前端签名,有accessid/accesskey泄漏的风险, 线上生产请使用后端签名例子<a href="https://help.aliyun.com/document_detail/oss/practice/pc_web_upload/js_php_upload.html">点击查看详细文档</a></li>
</ol>
<br>
<form name=theform>
<input type="radio" name="myradio" value="local_name" checked=true/> 上传文件名字保持本地文件名字
<input type="radio" name="myradio" value="random_name" /> 上传文件名字是随机文件名
<br/>
上传到指定目录:<input type="text" id='dirname' placeholder="如果不填,默认是上传到根目录" size=50>
</form>
<h5>您所选择的文件列表:</h5>
<div id="ossfile">你的浏览器不支持flash,Silverlight或者HTML5!</div>
<br/>
<div id="container">
<a id="selectfiles" href="javascript:void(0);" class='btn'>选择文件</a>
<a id="postfiles" href="javascript:void(0);" class='btn'>开始上传</a>
</div>
<pre id="console"></pre>
<p> </p>
</body>
<script type="text/javascript" src="lib/crypto1/crypto/crypto.js"></script>
<script type="text/javascript" src="lib/crypto1/hmac/hmac.js"></script>
<script type="text/javascript" src="lib/crypto1/sha1/sha1.js"></script>
<script type="text/javascript" src="lib/base64.js"></script>
<script type="text/javascript" src="lib/plupload-2.1.2/js/plupload.full.min.js"></script>
<script type="text/javascript" src="upload.js"></script>
</html>
实现点击按钮选择图片后显示图片并且可以预览该图片
跳转的按钮在子组件
this.$navigate({url:"content"})
this.$parent.$navigate({url:"content"})
wepy.navigateTo({
url: '/pages/content'
})
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