优化：引入 spotless 插件（代码等格式化插件），已对现有代码执行了格式优化（mvn spotless:apply）

pom.xml

@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="UTF-8"?>
+<!--
+Copyright (c) 2022-present Charles7c Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+-->
 <project xmlns="http://maven.apache.org/POM/4.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
@@ -22,6 +37,7 @@
     <properties>
         <!-- ### 基础环境相关 ### -->
         <java.version>1.8</java.version>
+        <spotless.version>2.28.0</spotless.version>
         <maven.compiler.source>8</maven.compiler.source>
         <maven.compiler.target>8</maven.compiler.target>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -86,6 +102,35 @@
         <!-- 设置构建的 jar 包名 -->
         <finalName>${project.name}</finalName>
         <plugins>
+            <!-- 代码等格式化插件 -->
+            <plugin>
+                <groupId>com.diffplug.spotless</groupId>
+                <artifactId>spotless-maven-plugin</artifactId>
+                <version>${spotless.version}</version>
+                <configuration>
+                    <java>
+                        <importOrder>
+                            <order>java,javax,org,com,top.charles7c,</order>
+                        </importOrder>
+                        <removeUnusedImports/>
+                        <eclipse>
+                            <file>${project.basedir}/code-style/spotless-formatter.xml</file>
+                        </eclipse>
+                        <licenseHeader>
+                            <file>${project.basedir}/code-style/license-header</file>
+                        </licenseHeader>
+                    </java>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>compile</phase>
+                        <goals>
+                            <goal>apply</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+            <!-- 单元测试配置插件 -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>