【fix sonar】 MapMessageConverter.java文件

jero-boot/jero-boot-starter/jero-boot-starter-rabbitmq/src/main/java/com/jero/boot/starter/rabbitmq/core/MapMessageConverter.java

@@ -7,8 +7,6 @@ import org.springframework.amqp.support.converter.MessageConverter;
 
 import java.io.ByteArrayInputStream;
 import java.io.ObjectInputStream;
-import java.util.HashMap;
-import java.util.Map;
 
 public class MapMessageConverter implements MessageConverter {
     @Override
@@ -27,8 +25,7 @@ public class MapMessageConverter implements MessageConverter {
                 ByteArrayInputStream byteInt = new ByteArrayInputStream(message.getBody());
                 objInt = new ObjectInputStream(byteInt);
                 //byte[]转map
-                Map map = (HashMap) objInt.readObject();
-                return map;
+                return objInt.readObject();
             } catch (Exception e) {
                 e.printStackTrace();
             }