后台授权app上传文件到阿里云OSS

最新推荐文章于 2025-07-20 20:28:15 发布

Man20161217

最新推荐文章于 2025-07-20 20:28:15 发布

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文章标签： OSS app

本文链接：https://blog.youkuaiyun.com/Man20161217/article/details/81196929

本文介绍如何使用阿里云OSS Java SDK配置并生成用于客户端直接上传文件的策略，包括设置访问密钥、过期时间及上传条件等。

1，pom

   <dependency>
           <groupId>com.aliyun.oss</groupId>
           <artifactId>aliyun-sdk-oss</artifactId>
           <version>2.8.0</version>
       </dependency>

2，代码

String endpoint = Global.getConfig("aliyun.oss.endpoint");
       String accessId = Global.getConfig("aliyun.oss.accessKeyId");
       String accessKey = Global.getConfig("aliyun.oss.accessKeySecret");
       String bucket = Global.getConfig("aliyun.oss.bucketName");
   String dir = "sit/feedback";
   String host = "http://" + bucket + "." + endpoint;
   OSSClient client = new OSSClient(endpoint, accessId, accessKey);
       Calendar calendar = Calendar.getInstance();
              Date date = DateUtils.nowDate();
       calendar.setTime(date);
       calendar.add(Calendar.DAY_OF_MONTH, 1);
       Date expiration = calendar.getTime();
   PolicyConditions policyConds = new PolicyConditions();
   policyConds.addConditionItem(PolicyConditions.COND_CONTENT_LENGTH_RANGE, 0, 1048576000);
   policyConds.addConditionItem(MatchMode.StartWith, PolicyConditions.COND_KEY, dir);

   String postPolicy = client.generatePostPolicy(expiration, policyConds);
   byte[] binaryData = postPolicy.getBytes("utf-8");
   String encodedPolicy = BinaryUtil.toBase64String(binaryData);
   String postSignature = client.calculatePostSignature(postPolicy);
   //json是个map，返回前端
   json.put("accessid", accessId);
   json.put("policy", encodedPolicy);
   json.put("signature", postSignature);
   json.put("dir", dir);
   json.put("host", host);
   json.put("expire", String.valueOf(expiration.getTime() / 1000));