Amazon aws s3上傳文件，並設置爲公共可讀

直接上硬菜：

1.依賴

<dependency>
			<groupId>com.amazonaws</groupId>
			<artifactId>aws-java-sdk-s3</artifactId>
			<version>1.11.625</version>
		</dependency>

2.編碼

public static String uploadToS3(MultipartFile file) throws IOException {
        String perfix = "https://xxxxx.s3-us-west-1.amazonaws.com/";
        String bucketName = "txxxxx";
        if (file.isEmpty()) {
            return "上傳文件不能爲空";
        }
        ObjectMetadata metadata = new ObjectMetadata();
        metadata.setContentType(file.getContentType());
        metadata.setContentLength(file.getSize());
        String key = UUID.randomUUID().toString().replaceAll("-", "") + "." + getFileType(file.getOriginalFilename());
        String fileTypeByContentType = getFileTypeByContentType(file.getContentType());
        if ("image".equals(fileTypeByContentType)) {
            bucketName = "xxx-img";
            perfix = "https://xxx-img.s3-us-west-1.amazonaws.com/";
        } else if ("video".equals(fileTypeByContentType)) {
            bucketName = "xxx-video1";
            perfix = "https://xxx-video1.s3-us-west-1.amazonaws.com/";
        } else {
            bucketName = "xxxx-other";
            perfix = "https://xxx-other.s3-us-west-1.amazonaws.com/";
        }

        try {
            //驗證名稱爲bucketName的bucket是否存在，不存在則創建
            if (!checkBucketExists(s3Client, bucketName)) {
                s3Client.createBucket(bucketName);
            }
zhi


/*之前被誤導，一直上傳上此的文件，返回一個鏈接帶有有效期，而且最七天，各種想辦法，其實是寫法就錯誤了，
應該用下面的這種寫法withCannedAcl，設置ACL權限就好，希望大家避坑*/
            //開始上傳文件
            s3Client.putObject(new PutObjectRequest(bucketName, key, file.getInputStream(), metadata)
                    .withCannedAcl(CannedAccessControlList.PublicRead));


            String url = perfix + key;
            if (url == null) {
                throw new BizException(GlobalExceptionEnum.SERVER_ERROR.getCode(), " can't get s3 file url!");
            }
            return url.toString();
        } catch (AmazonServiceException ase) {
            ase.printStackTrace();
            log.info("====================================AWS S3 UPLOAD ERROR START======================================");
            log.info("Caught an AmazonServiceException, which means your request made it "
                    + "to Amazon S3, but was rejected with an error response for some reason.");
            log.info("Caught an AmazonServiceException, which means your request made it "
                    + "to Amazon S3, but was rejected with an error response for some reason.");
            log.info("Error Message:    " + ase.getMessage());
            log.info("HTTP Status Code: " + ase.getStatusCode());
            log.info("AWS Error Code:   " + ase.getErrorCode());
            log.info("Error Type:       " + ase.getErrorType());
            log.info("Request ID:       " + ase.getRequestId());
            log.info(ase.getMessage(), ase);
            log.info("====================================AWS S3 UPLOAD ERROR END======================================");
            throw new BizException(GlobalExceptionEnum.SERVER_ERROR.getCode(), "error occurs during upload to s3!");
        } catch (AmazonClientException ace) {
            log.info("====================================AWS S3 UPLOAD ERROR START======================================");
            log.info("Caught an AmazonClientException, which means the client encountered "
                    + "a serious internal problem while trying to communicate with S3, "
                    + "such as not being able to access the network.");
            log.info("Error Message: " + ace.getMessage());
            log.info("====================================AWS S3 UPLOAD ERROR END======================================");
            throw new BizException(GlobalExceptionEnum.SERVER_ERROR.getCode(), "error occurs during upload to s3!");
        } finally {

        }
    }

就是這麼硬