bug fix

distributed-print-business/src/main/java/com/qmth/distributed/print/business/util/PdfUtil.java

@@ -46,27 +46,29 @@ public class PdfUtil {
         PdfReader reader = null;
         StringJoiner dirName = null;
         try {
-            document = new Document(new PdfReader(files[0]).getPageSize(1));
-            if (Objects.isNull(outputPath)) {
-                LocalDateTime nowTime = LocalDateTime.now();
-                StringJoiner stringJoiner = new StringJoiner("").add(SystemConstant.PDF_TEMP_FILES_DIR).add(File.separator);
-                dirName = new StringJoiner("")
-                        .add(UploadFileEnum.PDF.getTitle()).add(File.separator)
-                        .add(String.valueOf(nowTime.getYear())).add(File.separator)
-                        .add(String.format("%02d", nowTime.getMonthValue())).add(File.separator)
-                        .add(String.format("%02d", nowTime.getDayOfMonth()))
-                        .add(File.separator).add(SystemConstant.getUuid()).add(SystemConstant.PDF_PREFIX);
-                outputPath = stringJoiner.toString() + dirName.toString();
-            }
-            copy = new PdfSmartCopy(document, new FileOutputStream(outputPath));
-            document.open();
-            for (int i = 0; i < files.length; i++) {
-                reader = new PdfReader(files[i]);
-                int numberOfPages = reader.getNumberOfPages();
-                for (int j = 1; j <= numberOfPages; j++) {
-                    document.newPage();
-                    PdfImportedPage page = copy.getImportedPage(reader, j);
-                    copy.addPage(page);
+            if (Objects.nonNull(files) && files.length > 0) {
+                document = new Document(new PdfReader(files[0]).getPageSize(1));
+                if (Objects.isNull(outputPath)) {
+                    LocalDateTime nowTime = LocalDateTime.now();
+                    StringJoiner stringJoiner = new StringJoiner("").add(SystemConstant.PDF_TEMP_FILES_DIR).add(File.separator);
+                    dirName = new StringJoiner("")
+                            .add(UploadFileEnum.PDF.getTitle()).add(File.separator)
+                            .add(String.valueOf(nowTime.getYear())).add(File.separator)
+                            .add(String.format("%02d", nowTime.getMonthValue())).add(File.separator)
+                            .add(String.format("%02d", nowTime.getDayOfMonth()))
+                            .add(File.separator).add(SystemConstant.getUuid()).add(SystemConstant.PDF_PREFIX);
+                    outputPath = stringJoiner.toString() + dirName.toString();
+                }
+                copy = new PdfSmartCopy(document, new FileOutputStream(outputPath));
+                document.open();
+                for (int i = 0; i < files.length; i++) {
+                    reader = new PdfReader(files[i]);
+                    int numberOfPages = reader.getNumberOfPages();
+                    for (int j = 1; j <= numberOfPages; j++) {
+                        document.newPage();
+                        PdfImportedPage page = copy.getImportedPage(reader, j);
+                        copy.addPage(page);
+                    }
                 }
             }
         } catch (Exception e) {