feat: add Spotless plugin configuration for code formatting in Maven

Author: SYaoJun

.pre-commit-config.yaml

@@ -0,0 +1,9 @@
+repos:
+  - repo: local
+    hooks:
+      - id: maven-spotless-check
+        name: Spotless check (Maven)
+        entry: bash -c 'mvn -DspotlessFiles=\"$@\" spotless:check' --
+        language: system
+        pass_filenames: true
+        files: "\\.java$"

pom.xml

@@ -264,6 +264,43 @@
                 <artifactId>versions-maven-plugin</artifactId>
                 <version>2.8.1</version>
             </plugin>
+            <!-- spotless -->
+            <plugin>
+                <groupId>com.diffplug.spotless</groupId>
+                <artifactId>spotless-maven-plugin</artifactId>
+                <version>2.43.0</version>
+                <configuration>
+                    <java>
+                        <includes>
+                            <include>src/main/java/**/*.java</include>
+                            <include>src/test/java/**/*.java</include>
+                        </includes>
+                        <excludes>
+                            <exclude>**/generated/**/*</exclude>
+                            <exclude>**/proto/**/*</exclude>
+                        </excludes>
+                        <googleJavaFormat>
+                            <version>1.17.0</version>
+                            <style>GOOGLE</style>
+                            <reflowLongStrings>true</reflowLongStrings>
+                            <formatJavadoc>true</formatJavadoc>
+                        </googleJavaFormat>
+                        <importOrder>
+                            <order>java,javax,org,com,</order>
+                        </importOrder>
+                        <removeUnusedImports/>
+                        <formatAnnotations/>
+                    </java>
+                </configuration>
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                        <phase>validate</phase>
+                    </execution>
+                </executions>
+            </plugin>
 
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>