34、商品服务--品牌管理--OSS获取服务端签名

1、阿里云参考代码位置如下


2、我们单独创建一个模块，来编写有关第三方服务的代码
2.1） 注册中心和配置中心的相关配置
2.2）oss的配置编写

2.3）controller编写

package com.gulimall.thirdparty.controller;

import com.aliyun.oss.OSS;
import com.aliyun.oss.common.utils.BinaryUtil;
import com.aliyun.oss.model.MatchMode;
import com.aliyun.oss.model.PolicyConditions;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.Map;

@RestController
public class OssController {
    @Autowired
    OSS ossClient;

    @Value("{spring.cloud.alicloud.access-key}")
    String accessId;
    @Value("{spring.cloud.alicloud.oss.endpoint}")
    String endpoint;

    @RequestMapping("/oss/policy")
    public Map<String, String> getSignature(){
        // 填写Bucket名称，例如examplebucket。
        String bucket = "dqh-gulimall";
        // 填写Host地址，格式为https://bucketname.endpoint。
        String host = "https://" + bucket + "." + endpoint;

        String date = new SimpleDateFormat("yyyy-MM-dd").format(new Date());

        // 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。
        String dir = date + "/";

        Map<String, String> respMap = null;

        try {
            long expireTime = 30;
            long expireEndTime = System.currentTimeMillis() + expireTime * 1000;
            Date expiration = new Date(expireEndTime);
            PolicyConditions policyConds = new PolicyConditions();
            policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
            policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

            String postPolicy = ossClient.generatePostPolicy(expiration, policyConds);
            byte[] binaryData = postPolicy.getBytes("utf-8");
            String encodedPolicy = BinaryUtil.toBase64String(binaryData);
            String postSignature = ossClient.calculatePostSignature(postPolicy);

            respMap = new LinkedHashMap<String, String>();
            respMap.put("accessId", accessId);
            respMap.put("policy", encodedPolicy);
            respMap.put("signature", postSignature);
            respMap.put("dir", dir);
            respMap.put("host", host);
            respMap.put("expire", String.valueOf(expireEndTime / 1000));
        } catch (Exception e) {
            System.out.println(e.getMessage());
        }

        return respMap;
    }
}

2.4）由于要进行跨域，所以我们把请求发送到网关，由网关转发到相关服务