修改

src/main/java/org/rcisoft/core/util/CheckFileHeaderUtil.java

@@ -20,13 +20,14 @@ public class CheckFileHeaderUtil {
         return stringBuilder.toString();
     }
 
-    public String test(String url){
+    public String toCheck(String url){
         String result = "";
         try{
             FileInputStream is = new FileInputStream(url);
             byte[] b = new byte[3];
             is.read(b, 0, b.length);
             result = this.checkType(bytesToHexString(b).toUpperCase());
+            is.close();
         }catch (Exception e){
             log.debug(e.getMessage());
         }