1. 小程序端

upload.wxml

<view bindtap='onChooseImage'>上传头像</view>

upload.js

Page({

onChooseImage: function () {

var that = this;

wx.chooseImage({

success(res) {

const tempFilePaths = res.tempFilePaths

that.getCloudCdnParams(tempFilePaths[0])

}

})

},

//获取签名oss鉴权信息

getCloudCdnParams: function (filePath) {

var that = this;

var dataUrl = '服务端获取签名接口';

var params = new Object();

wx.request({

url: dataUrl,

method: "post",

header: {

'content-type': 'application/x-www-form-urlencoded'

},

success: function (res) {

that.uploadFileFun(res.data, filePath)

}

})

},

// 上传图片

uploadFileFun: function (result, filePath) {

//console.log(result)

var that = this;

var aliyunFileKey = result.dir + new Date().getTime() + Math.floor(Math.random() * 150) + '.png';

console.log(aliyunFileKey)

wx.uploadFile({

url: result.host,

filePath: filePath,

name: 'file',

/**上传的参数**/

formData: {

name: filePath,

key: aliyunFileKey,

policy: result.policy,

OSSAccessKeyId: result.accessid,

success_action_status: "200",

signature: result.signature,

},

success: function (res) {

/**这边上传成功后要自己拼接文件的地址**/

console.log(result.cdnurl + aliyunFileKey)

},

fail: function (res) {

console.log(res)

}

})

},

})

2、后台只提供一个签名接口就够了，因为是客户端直接上传到阿里云oss

namespace App\Controller;
use Think\Controller;
class OssController extends Controller{
 public function getSign(){
 //此处三个参数需要修改
 $ossConfig = C('UPLOAD_SITEIMG_OSS');
 $jiaoanUpload = I('request.jiaoan_upload_maxSize','0','intval');
 if($jiaoanUpload == 1){
 $ossConfig['maxSize'] = 1024*1024*1024;
 }
 $id= $ossConfig['driverConfig']['AccessKeyId'];
 $key= $ossConfig['driverConfig']['AccessKeySecret'];
 $host = rtrim($ossConfig['driverConfig']['domain'],'/');
 $now = time();
 $expire = 600; //设置该policy超时时间是10s. 即这个policy过了这个有效时间，将不能访问
 $end = $now + $expire;
 $expiration = $this->gmt_iso8601($end);
 //自定义目录
 $dir = 'wxupload/'.date('Ymd').'/';
 //最大文件大小.用户可以自己设置
 $condition = array(0=>'content-length-range', 1=>0, 2=>$ossConfig['maxSize']);
 $conditions[] = $condition;
 //表示用户上传的数据,必须是以$dir开始, 不然上传会失败,这一步不是必须项,只是为了安全起见,防止用户通过policy上传到别人的目录
 //此处语法为官方错误，单引号包含 $key,切勿改动，错误对错误才能验证成功
 $start = array(0=>'starts-with', 1=>'$key', 2=>$dir);
 $conditions[] = $start;
 $arr = array('expiration'=>$expiration,'conditions'=>$conditions);
 $policy = json_encode($arr);
 $base64_policy = base64_encode($policy);
 $string_to_sign = $base64_policy;
 $signature = base64_encode(hash_hmac('sha1', $string_to_sign, $key, true));
 $response = array();
 $response['accessid'] = $id;
 $response['host'] = $host;
 $response['policy'] = $base64_policy;
 $response['signature'] = $signature;
 $response['expire'] = $end;
 //这个参数是设置用户上传指定的前缀
 $response['dir'] = $dir;
 //使用CDN URL，链接后可直接加@45p,进行图片缩放
 $response['cdnurl'] =rtrim(C('file_url',null,$host),'/');
 //使用OSS URL
 //$response['cdnurl'] = $host;
 echo json_encode($response);
 exit;
 }
 public function gmt_iso8601($time) {
 vendor('DateTime.DateTimea');
 $dtStr = date("c", $time);
 $mydatetime = new \DateTimea($dtStr);
 $expiration = $mydatetime->format();
 $pos = strpos($expiration, '+');
 $expiration = substr($expiration, 0, $pos);
 return $expiration."Z";
 }