Intellij中使用Spotless 格式化代码

Spotless简介

在一些大型项目或开源项目，由于开发人员太多，导致各个代码格式不统一。会让整体项目的代码可读性变差。统一代码格式使用maven中的Spotless插件就是不错的选择。

Spotless 是一个代码格式化工具，它有以下功能：

支持的开发语言有java, kotlin, scala, sql, javascript, css, json, yaml, etc。
可以提示哪里不规范，同时也支持自动修正（批量的将所有类格式化）
支持maven|gradle plugin等插件

Spotless 有多种 Java 代码格式化方式，例如：googleJavaFormat、eclipse、prettier 等。基于定制化的考虑，可以采用 eclipse 进行 Java 代码格式化。

示例

第一步：在项目根目录创建license-header文件

/*
 * Copyright 2023 杭州云亮科技有限公司
 *
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

第二步：在项目根目录创建shardingsphere_eclipse_formatter.xml文件（可省略）

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!--
/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
-->
<profiles version="13">
    <profile kind="CodeFormatterProfile" name="'ShardingSphere Apache Current'" version="13">
        <setting id="org.eclipse.jdt.core.compiler.source" value="1.8"/>
        <setting id="org.eclipse.jdt.core.compiler.compliance" value="1.8"/>
        <setting id="org.eclipse.jdt.core.compiler.codegen.targetPlatform" value="1.8"/>
        <setting id="org.eclipse.jdt.core.formatter.indent_empty_lines" value="true"/>
        <setting id="org.eclipse.jdt.core.formatter.tabulation.size" value="4"/>
        <setting id="org.eclipse.jdt.core.formatter.lineSplit" value="200"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.line_length" value="200"/>
        <setting id="org.eclipse.jdt.core.formatter.tabulation.char" value="space"/>
        <setting id="org.eclipse.jdt.core.formatter.indentation.size" value="1"/>
        <setting id="org.eclipse.jdt.core.formatter.comment.format_javadoc_comments" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.join_wrapped_lines" value="false"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_conditional" value="insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_default" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_enum_constants" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_labeled_statement" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.insert_space_before_colon_in_case" value="do not insert"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_conditional_expression" value="80"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_assignment" value="16"/>
        <setting id="org.eclipse.jdt.core.formatter.blank_lines_after_package" value="1"/>
        <setting id="org.eclipse.jdt.core.formatter.continuation_indentation_for_array_initializer" value="2"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_resources_in_try" value="160"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_method_declaration" value="10"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_method_declaration" value="106"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_parameters_in_constructor_declaration" value="106"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_throws_clause_in_constructor_declaration" value="106"/>
        <setting id="org.eclipse.jdt.core.formatter.alignment_for_arguments_in_explicit_constructor_call.count_dependent" value="16|5|80"/>
    </profile>
</profiles>

第三步：在pom.xml的标签下添加插件：

<plugin>
    <groupId>com.diffplug.spotless</groupId>
    <artifactId>spotless-maven-plugin</artifactId>
    <version>2.36.0</version>
    <configuration>
        <java>
            <googleJavaFormat>
                <version>1.16.0</version>
                <style>AOSP</style>
                <reflowLongStrings>true</reflowLongStrings>
            </googleJavaFormat>
            <eclipse>
                <file>${project.basedir}/shardingsphere_eclipse_formatter.xml</file>
            </eclipse>
            <licenseHeader>
                <file>${project.basedir}/license-header</file>
            </licenseHeader>
        </java>
    </configuration>
    <!--将 Spotless apply 绑定到 compile 阶段，这样本地执行 mvn install 时就能自动格式化-->
    <executions>
        <execution>
            <goals>
                <goal>apply</goal>
            </goals>
            <phase>compile</phase>
        </execution>
    </executions>
</plugin>