SpringBoot对接阿里云OSS上传文件以及回调（有坑）|世界快资讯

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今天在对接阿里云OSS对象存储， 把这过程记录下来

阿里云的内容很多，文档是真的难找又难懂本文主要是用的PostObject API 加上 Callback参数PostObject -> https://help.aliyun.com/document_detail/31988.html?spm=a2c4g.31989.0.0Callback -> https://help.aliyun.com/document_detail/31989.html?spm=a2c4g.31988.0.0

相比应用服务器直接上传到OSS，大大减少了带宽和应用服务器的压力，缺点就是相对麻烦一点

我们用的是SpringBoot，我们导入aliyun-oss-spring-boot-starter包，因为我这个是 SpringCloud项目父项目管理了SpringCloud 和 SpringCloud Alibaba 、SpringBoot版本的，所以一开始我是没有写版本号的，结果一直爆红，导不进来，然后仔细一看，原来这是aliyun-oss-spring-boot-starter，注意这个boot-starter，我还以为是cloud系列的，然而哈哈，然后导入aliyun-spring-boot-dependencies，我在仓库里面去找版本号，然而它也只有这一个1.0.0版本

org.springframework.bootspring-boot-starter-webcom.alibaba.cloudaliyun-oss-spring-boot-startercom.alibaba.cloudaliyun-spring-boot-dependencies1.0.0pomimport      

alibaba:  cloud:    # 阿里控制台OSS子账户的信息     access-key: LTAI5tDZ51bANyHxYpwZzvpi    secret-key: zPxHPuaZMTPzTPy0WF88vI99HHLOzO    oss:      # 深圳endpoint      endpoint: oss-cn-shenzhen.aliyuncs.com      # 认证过期 单位秒      expireTime: 1200      # 储存空间名字      bucket: yues-oss

package com.yues.gulimall.thirdparty.controller;import com.aliyun.oss.OSS;import com.aliyun.oss.common.utils.BinaryUtil;import com.aliyun.oss.model.Callback;import com.aliyun.oss.model.MatchMode;import com.aliyun.oss.model.PolicyConditions;import com.fasterxml.jackson.databind.ObjectMapper;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.annotation.Value;import org.springframework.web.bind.annotation.PostMapping;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import javax.servlet.http.HttpServletRequest;import java.nio.charset.StandardCharsets;import java.text.SimpleDateFormat;import java.util.*;@RestControllerpublic class OssController {    @Autowired    private OSS ossClient;    @Value("${alibaba.cloud.oss.endpoint}")    private String endpoint;    @Value("${alibaba.cloud.access-key}")    private String accessId;    @Value("${alibaba.cloud.oss.expireTime}")    private long expireTime;    @Value("${alibaba.cloud.oss.bucket}")    private String bucket;    /**     * 回调     * @param request request     * @return Map     */    @RequestMapping("/ossCallback")    public Map ossCallback(HttpServletRequest request) {        HashMap result = new HashMap<>();        String filename = request.getParameter("filename");        Map parameterMap = request.getParameterMap();        parameterMap.forEach((item,value) -> {            System.out.println(item);            System.out.println(Arrays.toString(value));        });        filename = "https://".concat(bucket).concat(".").concat(endpoint).concat("/").concat(filename);        result.put("url", filename);        result.put("size", request.getParameter("size"));        result.put("mimeType", request.getParameter("mimeType"));        return result;    }    /**     * 签名     * @return Map     */    @PostMapping("/getOssSecret")    public Map getOssSign() {        // 填写Host地址，格式为https://bucketname.endpoint。        String host = "https://" + bucket + "."+ endpoint;        // OSS会在文件上传完成后，把文件上传信息发送给应用服务器。需要外网ip        String callbackUrl = "https://23d4-1-196-175-217.ngrok-free.app/ossCallback";        // 设置上传到OSS文件的前缀，可置空此项。置空后，文件将上传至Bucket的根目录下。        // 将日期作为上传的文件夹目录        String format = new SimpleDateFormat("yyyy-MM-dd").format(new Date());        String dir = format+"/";        Map respMap = null;        try {            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;            // 过期时间            Date expiration = new Date(expireEndTime);            // 上传回调参数。            Callback callback = new Callback();            callback.setCallbackUrl(callbackUrl);            // 设置回调请求消息头中Host的值，即您的服务器配置Host的值。需要外网ip             callback.setCallbackHost("23d4-1-196-175-217.ngrok-free.app");            // 设置发起回调时请求body的值。            callback.setCallbackBody("filename=${object}&size=${size}&mimeType=${mimeType}");            // 设置发起回调请求的Content-Type。            callback.setCalbackBodyType(Callback.CalbackBodyType.JSON);            // 设置发起回调请求的自定义参数，由Key和Value组成，Key必须以x:开始。            callback.addCallbackVar("x:var1", "value1");            callback.addCallbackVar("x:var2", "value2");            // 序列化callback            String callbackString = BinaryUtil.toBase64String(new ObjectMapper().writeValueAsString(callback).getBytes(StandardCharsets.UTF_8));            PolicyConditions policyConds = new PolicyConditions();            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);            // 添加目录权限，返回的认证信息只能在这个目录下进行操作            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);            // 生成认证 添加过期时间            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);            byte[] binaryData = postPolicy.getBytes(StandardCharsets.UTF_8);            // 转为Base64            String encodedPolicy = BinaryUtil.toBase64String(binaryData);            String postSignature = ossClient.calculatePostSignature(postPolicy);            respMap = new LinkedHashMap<>();            respMap.put("OSSAccessKeyId", accessId);            respMap.put("policy", encodedPolicy);            respMap.put("Signature", postSignature);            respMap.put("dir", dir);            respMap.put("host", host);            respMap.put("callback", callbackString);            // 过期时间的时间戳            respMap.put("expire", String.valueOf(expireEndTime / 1000));        } catch (Exception e) {            throw new RuntimeException("aliyun上传文件获取认证信息失败：" + e.getMessage());        }        return  respMap;    }}

{    "OSSAccessKeyId": "LTAI5tDZ51bANyHxYpwZzvpi",    "policy": "eyJleHBpcmF0aW9uIjoiMjAyMy0wNy0wM1QxNzoxNzo1MS44ODBaIiwiY29uZGl0aW9ucyI6W1siY29udGVudC1sZW5ndGgtcmFuZ2UiLDAsMTA0ODU3NjAwMF0sWyJzdGFydHMtd2l0aCIsIiRrZXkiLCIyMDIzLTA3LTA0LyJdXX0=",    "Signature": "yK5oF8Cj0ncR0ceuIMtXdMW1yco=",    "dir": "2023-07-04/",    "host": "https://yues-oss.oss-cn-shenzhen.aliyuncs.com",    "callback": "eyJjYWxsYmFja1VybCI6Imh0dHBzOi8vMjNkNC0xLTE5Ni0xNzUtMjE3Lm5ncm9rLWZyZWUuYXBwL29zc0NhbGxiYWNrIiwiY2FsbGJhY2tIb3N0IjoiMjNkNC0xLTE5Ni0xNzUtMjE3Lm5ncm9rLWZyZWUuYXBwIiwiY2FsbGJhY2tCb2R5IjoiZmlsZW5hbWU9JHtvYmplY3R9JnNpemU9JHtzaXplfSZtaW1lVHlwZT0ke21pbWVUeXBlfSIsImNhbGJhY2tCb2R5VHlwZSI6IkpTT04iLCJjYWxsYmFja1ZhciI6eyJ4OnZhcjIiOiJ2YWx1ZTIiLCJ4OnZhcjEiOiJ2YWx1ZTEifX0=",    "expire": "1688404671"}

拿到第四步的JSON后，请求JSON中的host，key = dir + 文件名.后缀，然后按照下图方式请求注意：

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