下载文档判断文件是否存在

src/main/java/com/github/jfcloud/excel/editor/docdeal/controller/FileController.java

@@ -106,10 +106,19 @@ public class FileController {
             bucket = ossProperties.getBucketName();
         }
         log.info("==> 下载文档: name={}, bucket={}", name, bucket);
+
+        long size = ossTemplate.getSize(bucket, name);
+
         try {
+            if (size < 0) {
+                log.error("文档不存在 name={}, bucket={}", name, bucket);
+                response.getWriter().println("文档 " + name + " 不存在");
+                return;
+            }
+
             response.setContentType("application/octet-stream");
             response.setHeader("Content-Disposition", "attachment;filename*=utf8''" + URLEncodeUtil.encode(name));
-            response.setHeader("Content-Length", String.valueOf(ossTemplate.getSize(bucket, name)));
+            response.setHeader("Content-Length", String.valueOf(size));
 
             S3Object s3Object = ossTemplate.getObject(bucket, name);
             IoUtil.copy(s3Object.getObjectContent(), response.getOutputStream());
@@ -140,14 +149,13 @@ public class FileController {
 
     private Pair<Document, DocumentEditParam> docPair(String bucket, String title, String name,
                                                       String userId, String userName) {
-        String downloadUrl = String.format(DocumentConstants.OFFICE_API_DOC_FILE, serverUrl, name);
-        if (StrUtil.isNotBlank(bucket)) {
-            downloadUrl += "&bucket=" + bucket;
-        }
 
         title = StrUtil.isBlank(title) ? name : title;
         bucket = StrUtil.isBlank(bucket) ? ossProperties.getBucketName() : bucket;
 
+        String downloadUrl = String.format(DocumentConstants.OFFICE_API_DOC_FILE, serverUrl, name);
+        downloadUrl += "&bucket=" + bucket;
+
         Document document = Document.builder()
                 .key(FileNameUtil.getPrefix(name))
                 .title(title)

src/main/java/com/github/jfcloud/excel/editor/docdeal/oss/service/OssTemplate.java

@@ -103,7 +103,7 @@ public class OssTemplate implements InitializingBean {
      */
     public long getSize(String bucketName, String objectName) {
         List<S3ObjectSummary> apks = amazonS3.listObjects(bucketName, objectName).getObjectSummaries();
-        return apks.isEmpty() ? 0 : apks.get(0).getSize();
+        return apks.isEmpty() ? -1 : apks.get(0).getSize();
     }
 
     public void putObject(String bucketName, String objectName, InputStream stream) throws Exception {