2.16~代码质量：null引用

lxw

2023-11-03 2560a5d3d0a504a41691528dc1d8c0a6f1cdd6b7

 src/main/java/com/whyc/util/ExcelUtil.java

@@ -75,9 +75,11 @@
            //不保存缓存信息与response.reset同样效果
            response.addHeader("Pragma", "no-cache");
            response.addHeader("Cache-Control", "no-cache");
            wb.write(os);
            os.flush();
            os.close();
            if(os!=null){
                wb.write(os);
                os.flush();
                os.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }