close input stream from commont util

Author: Yang Guo

platform-api/src/main/java/com/flow/platform/api/util/CommonUtil.java

@@ -17,15 +17,13 @@
 package com.flow.platform.api.util;
 
 import com.flow.platform.api.config.AppConfig;
-import java.io.IOException;
 import java.io.InputStream;
 import java.math.BigInteger;
 import java.time.LocalDateTime;
 import java.time.format.DateTimeFormatter;
 import java.util.UUID;
 import org.apache.commons.io.IOUtils;
 import org.springframework.web.multipart.MultipartFile;
-import org.springframework.web.multipart.commons.CommonsMultipartFile;
 
 /**
  * @author yh@firim
@@ -52,8 +50,7 @@ public synchronized static BigInteger randomId() {
      * @return
      */
     public static String commonsMultipartFileToString(MultipartFile file) {
-        try {
-            InputStream is = file.getInputStream();
+        try (InputStream is = file.getInputStream()) {
             return IOUtils.toString(is, AppConfig.DEFAULT_CHARSET.name());
         } catch (Throwable throwable) {
             return null;