预览时不返回pdf数据

src/main/java/com/uas/report/controller/PrintController.java

@@ -167,8 +167,8 @@ public class PrintController {
 		Map<String, Object> result = printService.preview(userName, reportName, whereCondition, otherParameters,
 				pageIndex);
 		byte[] data = null;
-		if (result != null && result.get("data") != null) {
-			data = (byte[]) result.get("data");
+		if (result != null && result.containsKey("data")) {
+			data = (byte[]) result.remove("data");
 		}
 		String message = "";
 		if (data == null) {