:bug: #1500 修复企业微信素材下载报错问题：Prefix string too short

weixin-java-common/src/main/java/me/chanjar/weixin/common/util/http/apache/ApacheMediaDownloadRequestExecutor.java

@@ -63,7 +63,12 @@ public class ApacheMediaDownloadRequestExecutor extends BaseMediaDownloadRequest
         fileName = String.valueOf(System.currentTimeMillis());
       }
 
-      return FileUtils.createTmpFile(inputStream, FilenameUtils.getBaseName(fileName), FilenameUtils.getExtension(fileName),
+      String baseName = FilenameUtils.getBaseName(fileName);
+      if (StringUtils.isBlank(fileName) || baseName.length() < 3) {
+        baseName = String.valueOf(System.currentTimeMillis());
+      }
+
+      return FileUtils.createTmpFile(inputStream, baseName, FilenameUtils.getExtension(fileName),
         super.tmpDirFile);
 
     } finally {

weixin-java-common/src/main/java/me/chanjar/weixin/common/util/http/jodd/JoddHttpMediaDownloadRequestExecutor.java

@@ -60,9 +60,14 @@ public class JoddHttpMediaDownloadRequestExecutor extends BaseMediaDownloadReque
       return null;
     }
 
+    String baseName = FilenameUtils.getBaseName(fileName);
+    if (StringUtils.isBlank(fileName) || baseName.length() < 3) {
+      baseName = String.valueOf(System.currentTimeMillis());
+    }
+
     try (InputStream inputStream = new ByteArrayInputStream(response.bodyBytes())) {
       return FileUtils.createTmpFile(inputStream,
-        FilenameUtils.getBaseName(fileName),
+        baseName,
         FilenameUtils.getExtension(fileName),
         super.tmpDirFile);
     }

weixin-java-common/src/main/java/me/chanjar/weixin/common/util/http/okhttp/OkHttpMediaDownloadRequestExecutor.java

@@ -58,8 +58,13 @@ public class OkHttpMediaDownloadRequestExecutor extends BaseMediaDownloadRequest
       return null;
     }
 
+    String baseName = FilenameUtils.getBaseName(fileName);
+    if (StringUtils.isBlank(fileName) || baseName.length() < 3) {
+      baseName = String.valueOf(System.currentTimeMillis());
+    }
+
     File file = File.createTempFile(
-      FilenameUtils.getBaseName(fileName), "." + FilenameUtils.getExtension(fileName), super.tmpDirFile
+      baseName, "." + FilenameUtils.getExtension(fileName), super.tmpDirFile
     );
 
     try (BufferedSink sink = Okio.buffer(Okio.sink(file))) {