diff --git a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/common/util/ServiceTestUtil.java b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/common/util/ServiceTestUtil.java
index c65a244..fa568ff 100644
--- a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/common/util/ServiceTestUtil.java
+++ b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/common/util/ServiceTestUtil.java
@@ -24,10 +24,13 @@
 import org.apache.dubbo.metadata.definition.model.ServiceDefinition;
 import org.apache.dubbo.metadata.definition.model.TypeDefinition;
 
-import java.util.*;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-import java.util.stream.Collectors;
 
 public class ServiceTestUtil {
     private static Pattern COLLECTION_PATTERN = Pattern.compile("^java\\.util\\..*(Set|List|Queue|Collection|Deque)(<.*>)*$");
diff --git a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/controller/ServiceTestController.java b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/controller/ServiceTestController.java
index 8279212..a07299d 100644
--- a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/controller/ServiceTestController.java
+++ b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/controller/ServiceTestController.java
@@ -11,8 +11,12 @@
 import org.apache.dubbo.metadata.definition.model.FullServiceDefinition;
 import org.apache.dubbo.metadata.definition.model.MethodDefinition;
 import org.apache.dubbo.metadata.identifier.MetadataIdentifier;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.web.bind.annotation.*;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
 
 import java.util.List;
 import java.util.Map;
diff --git a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/model/domain/MethodMetadata.java b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/model/domain/MethodMetadata.java
index 1889e7b..6a59c26 100644
--- a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/model/domain/MethodMetadata.java
+++ b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/model/domain/MethodMetadata.java
@@ -18,7 +18,6 @@
 package org.apache.dubbo.admin.model.domain;
 
 import java.util.List;
-import java.util.Map;
 
 public class MethodMetadata {
     private String signature;
diff --git a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/registry/metadata/impl/ZookeeperMetaDataCollector.java b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/registry/metadata/impl/ZookeeperMetaDataCollector.java
index af334e3..48c3cf3 100644
--- a/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/registry/metadata/impl/ZookeeperMetaDataCollector.java
+++ b/dubbo-admin-backend/src/main/java/org/apache/dubbo/admin/registry/metadata/impl/ZookeeperMetaDataCollector.java
@@ -27,8 +27,6 @@
 import org.apache.dubbo.common.logger.LoggerFactory;
 import org.apache.dubbo.metadata.identifier.MetadataIdentifier;
 
-import javax.annotation.PostConstruct;
-
 public class ZookeeperMetaDataCollector implements MetaDataCollector {
 
     private static final Logger logger = LoggerFactory.getLogger(ZookeeperMetaDataCollector.class);
diff --git a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/common/util/UrlUtilsTest.java b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/common/util/UrlUtilsTest.java
index 5250c17..6d74e9a 100644
--- a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/common/util/UrlUtilsTest.java
+++ b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/common/util/UrlUtilsTest.java
@@ -16,7 +16,6 @@
  */
 package org.apache.dubbo.admin.common.util;
 
-import org.apache.dubbo.admin.common.util.UrlUtils;
 import org.junit.Assert;
 import org.junit.Test;
 
diff --git a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/config/ConfigCenterTest.java b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/config/ConfigCenterTest.java
index cb81fa7..4ce1be8 100644
--- a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/config/ConfigCenterTest.java
+++ b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/config/ConfigCenterTest.java
@@ -34,7 +34,10 @@
 
 import java.io.IOException;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.fail;
 
 
 @RunWith(SpringJUnit4ClassRunner.class)
diff --git a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ConditionRoutesControllerTest.java b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ConditionRoutesControllerTest.java
index 27f2962..ad7a340 100644
--- a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ConditionRoutesControllerTest.java
+++ b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ConditionRoutesControllerTest.java
@@ -17,11 +17,6 @@
 
 package org.apache.dubbo.admin.controller;
 
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import java.util.UUID;
-import java.util.stream.Collectors;
 import org.apache.dubbo.admin.AbstractSpringIntegrationTest;
 import org.apache.dubbo.admin.common.util.YamlParser;
 import org.apache.dubbo.admin.model.dto.ConditionRouteDTO;
@@ -35,6 +30,13 @@
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
 import static org.hamcrest.Matchers.containsInAnyOrder;
 import static org.hamcrest.Matchers.containsString;
 import static org.hamcrest.Matchers.hasSize;
diff --git a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ManagementControllerTest.java b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ManagementControllerTest.java
index f4114ba..fc061e1 100644
--- a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ManagementControllerTest.java
+++ b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ManagementControllerTest.java
@@ -17,7 +17,6 @@
 
 package org.apache.dubbo.admin.controller;
 
-import java.util.UUID;
 import org.apache.dubbo.admin.AbstractSpringIntegrationTest;
 import org.apache.dubbo.admin.common.util.Constants;
 import org.apache.dubbo.admin.model.dto.ConfigDTO;
@@ -32,6 +31,7 @@
 
 import java.util.ArrayList;
 import java.util.List;
+import java.util.UUID;
 import java.util.stream.Collectors;
 
 import static org.hamcrest.Matchers.hasSize;
diff --git a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ServiceControllerTest.java b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ServiceControllerTest.java
index 1d9be1a..3972c92 100644
--- a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ServiceControllerTest.java
+++ b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/controller/ServiceControllerTest.java
@@ -17,8 +17,6 @@
 
 package org.apache.dubbo.admin.controller;
 
-import java.util.Set;
-import java.util.concurrent.TimeUnit;
 import org.apache.dubbo.admin.AbstractSpringIntegrationTest;
 import org.apache.dubbo.admin.common.util.Constants;
 import org.apache.dubbo.admin.model.dto.ServiceDTO;
@@ -32,6 +30,10 @@
 import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+
+import java.util.Set;
+import java.util.concurrent.TimeUnit;
+
 import static org.hamcrest.Matchers.hasSize;
 import static org.hamcrest.Matchers.is;
 import static org.junit.Assert.assertThat;
diff --git a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/registry/config/impl/ZookeeperConfigurationTest.java b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/registry/config/impl/ZookeeperConfigurationTest.java
index 7c2c90f..7f15836 100644
--- a/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/registry/config/impl/ZookeeperConfigurationTest.java
+++ b/dubbo-admin-backend/src/test/java/org/apache/dubbo/admin/registry/config/impl/ZookeeperConfigurationTest.java
@@ -17,11 +17,10 @@
 
 package org.apache.dubbo.admin.registry.config.impl;
 
+import org.apache.curator.test.TestingServer;
 import org.apache.dubbo.admin.common.util.Constants;
 import org.apache.dubbo.common.URL;
 import org.apache.dubbo.common.utils.NetUtils;
-
-import org.apache.curator.test.TestingServer;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;