Update README.md

修改案例

README.md

@@ -127,6 +127,9 @@ public class Down {
     @GetMapping("/a.htm")
     public void cooperation(HttpServletRequest request, HttpServletResponse response) {
         ServletOutputStream out = response.getOutputStream();
+         response.setContentType("multipart/form-data");
+        response.setCharacterEncoding("utf-8");
+        response.setHeader("Content-disposition", "attachment;filename="+fileName+".xlsx");
         ExcelWriter writer = new ExcelWriter(out, ExcelTypeEnum.XLSX, true);
         String fileName = new String(("UserInfo " + new SimpleDateFormat("yyyy-MM-dd").format(new Date()))
                 .getBytes(), "UTF-8");
@@ -134,9 +137,7 @@ public class Down {
         sheet1.setSheetName("第一个sheet");
         writer.write0(getListString(), sheet1);
         writer.finish();
-        response.setContentType("multipart/form-data");
-        response.setCharacterEncoding("utf-8");
-        response.setHeader("Content-disposition", "attachment;filename="+fileName+".xlsx");
+      
         out.flush();
         }
     }