以下代碼用於上傳回調（callback）：
// Endpoint以杭州為例，其它Region請按實際情況填寫。String endpoint = "http://oss-cn-hangzhou.aliyuncs.com";// 阿里雲主帳號AccessKey擁有所有API的存取權限，風險很高。強烈建議您建立並使用RAM帳號進行API訪問或日常運維，請登入 https://ram.console.aliyun.com 建立RAM帳號。String accessKeyId = "<yourAccessKeyId>";String accessKeySecret = "<yourAccessKeySecret>";String bucketName = "<yourBucketName>";String objectName = "<yourObjectName>";// 您的回調伺服器位址，如http://oss-demo.aliyuncs.com:23450或http://127.0.0.1:9090。String callbackUrl = "<yourCallbackServerUrl>";// 建立OSSClient執行個體。OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);String content = "Hello OSS";PutObjectRequest putObjectRequest = new PutObjectRequest(bucketName, objectName,new ByteArrayInputStream(content.getBytes()));// 上傳回調參數。Callback callback = new Callback();callback.setCallbackUrl(callbackUrl);// 設定回調請求消息頭中Host的值，如oss-cn-hangzhou.aliyuncs.com。callback.setCallbackHost("oss-cn-hangzhou.aliyuncs.com");// 設定發起回調時請求body的值。callback.setCallbackBody("{\\\"mimeType\\\":${mimeType},\\\"size\\\":${size}}");// 設定發起回調請求的Content-Type。callback.setCalbackBodyType(CallbackBodyType.JSON);// 設定發起回調請求的自訂參數，由Key和Value組成，Key必須以x:開始。callback.addCallbackVar("x:var1", "value1");callback.addCallbackVar("x:var2", "value2");putObjectRequest.setCallback(callback);PutObjectResult putObjectResult = ossClient.putObject(putObjectRequest);// 讀取上傳回調返回的消息內容。byte[] buffer = new byte[1024];putObjectResult.getCallbackResponseBody().read(buffer);// 資料讀取完成後，獲取的流必須關閉，否則會造成連接泄漏，導致請求無連接可用，程式無法正常工作。putObjectResult.getCallbackResponseBody().close();// 關閉OSSClient。ossClient.shutdown();