新增了 流下载方法

basic-util/src/main/java/ink/wgink/util/request/RequestUtil.java

@@ -88,4 +88,25 @@ public class RequestUtil {
         }
     }
 
+    /**
+     * 下载
+     *
+     * @param response
+     * @param inputStream
+     * @param outFileName
+     * @throws IOException
+     */
+    public static void download(HttpServletResponse response, InputStream inputStream, String outFileName) throws IOException {
+        try (OutputStream outputStream = response.getOutputStream()) {
+            response.setHeader("content-type", "application/octet-stream");
+            response.setContentType("application/octet-stream");
+            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(outFileName, "UTF-8"));
+            byte[] buf = new byte[1024];
+            for (int readLength; (readLength = inputStream.read(buf)) > 0; ) {
+                outputStream.write(buf, 0, readLength);
+            }
+            outputStream.flush();
+        }
+    }
+
 }