diff --git a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/OssService.java b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/OssService.java
index 74001eea..7451abd8 100644
--- a/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/OssService.java
+++ b/ess/ess-server/src/main/java/cn/axzo/nanopart/ess/server/ess/support/OssService.java
@@ -1,16 +1,7 @@
 
 package cn.axzo.nanopart.ess.server.ess.support;
 
-import cn.axzo.nanopart.ess.server.utils.BizAssertions;
-import cn.axzo.oss.http.api.ServerFileServiceApi;
-import cn.axzo.oss.http.model.ApiSignUrlDownloadRequest;
-import cn.axzo.oss.http.model.ApiSignUrlDownloadResponse;
-import cn.axzo.oss.http.model.ApiSignUrlUploadRequest;
-import cn.axzo.oss.http.model.ApiSignUrlUploadResponse;
-import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
-import org.apache.commons.collections4.CollectionUtils;
-import org.springframework.stereotype.Component;
+import static cn.axzo.nanopart.ess.server.utils.BizAssertions.fail;
 
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
@@ -23,7 +14,17 @@ import java.net.URLEncoder;
 import java.util.Collections;
 import java.util.List;
 
-import static cn.axzo.nanopart.ess.server.utils.BizAssertions.fail;
+import org.apache.commons.collections4.CollectionUtils;
+import org.springframework.stereotype.Component;
+
+import cn.axzo.nanopart.ess.server.utils.BizAssertions;
+import cn.axzo.oss.http.api.ServerFileServiceApi;
+import cn.axzo.oss.http.model.ApiSignUrlDownloadRequest;
+import cn.axzo.oss.http.model.ApiSignUrlDownloadResponse;
+import cn.axzo.oss.http.model.ApiSignUrlUploadRequest;
+import cn.axzo.oss.http.model.ApiSignUrlUploadResponse;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 
 /**
  * @author yanglin
@@ -91,21 +92,16 @@ public class OssService {
 		connection.setRequestProperty("Content-Type", ossResponse.getContentType());
 		connection.setRequestProperty("Content-Disposition",
 			String.format("attachment;filename=\"%s\"", URLEncoder.encode(fileName, "utf-8")));
-		try {
-			try (OutputStream os = connection.getOutputStream()) {
-				ByteArrayInputStream is = new ByteArrayInputStream(content);
-				byte[] buffer = new byte[4096];
-				int bytesRead;
-				while ((bytesRead = is.read(buffer)) != -1)
-					os.write(buffer, 0, bytesRead);
-				os.flush();
-			}
+		try (OutputStream os = connection.getOutputStream()) {
+			ByteArrayInputStream is = new ByteArrayInputStream(content);
+			byte[] buffer = new byte[4096];
+			int bytesRead;
+			while ((bytesRead = is.read(buffer)) != -1)
+				os.write(buffer, 0, bytesRead);
+			os.flush();
 			int responseCode = connection.getResponseCode();
 			log.info("上传到OSS返回码: {}", responseCode);
 		}
-		finally {
-			connection.disconnect();
-		}
 	}
 
 }