修改了生成pdf的错误提示方式

bladex-saas-project/saas-business-tradeerp/src/main/java/com/fjhx/purchase/controller/PurchaseDocumentaryController.java

@@ -27,6 +27,8 @@ import org.springframework.web.bind.annotation.*;
 
 import javax.servlet.ServletOutputStream;
 import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
 import java.util.Date;
 import java.util.List;
 import java.util.Map;
@@ -167,8 +169,11 @@ public class PurchaseDocumentaryController {
             outputStream = response.getOutputStream();
             service.pdfPreview(pdfPreviewDto, outputStream);
         } catch (Exception e) {
-            log.error("预览pdf失败", e);
-            throw new ServiceException("预览pdf失败");
+            try {
+                outputStream.write("预览pdf失败".getBytes(StandardCharsets.UTF_8));
+            } catch (IOException ex) {
+                throw new RuntimeException(ex);
+            }
         } finally {
             IoUtil.close(outputStream);
         }