1、添加依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>druid</artifactId>
	<version>1.2.8</version>
</dependency>

2、基本的方法

需要美化的SQL可以直接调用如下方法：

formatMysql(String sql)

formatOdps(String sql)

formatOracle(String sql)

formatPGSql(String sql)

如果数据库类型不是以上四个，还可以
format(String sql,String dbType)

3、实际测试代码

package com.shucha.deveiface.biz.test;

import com.alibaba.druid.DbType;
import com.alibaba.druid.sql.SQLUtils;

/**
 * @author tqf
 * @Description sql语句格式化
 * @Version 1.0
 * @since 2022-07-19 11:48
 */
public class SqlFormat {
    public static void main(String[] args) {
        String mysql = "SELECT *,CASE WHEN UNIX_TIMESTAMP( expire_time ) < UNIX_TIMESTAMP( NOW( ) ) THEN 1 ELSE 0 END state FROM `expire_time_data`;";
        mysql(mysql);
        String oracle = "SELECT a.TABLE_NAME,b.COMMENTS FROM user_tables a,user_tab_comments b WHERE a.TABLE_NAME=b.TABLE_NAME ORDER BY TABLE_NAME;";
        oracleSql(oracle);
        String pgsql = "SELECT tablename FROM pg_tables WHERE tablename NOT LIKE pg% AND tablename NOT LIKE sql_% ORDER BY tablename;";
        PgSql(pgsql);
        sqlFormat(mysql,DbType.mysql);
    }

    /**
     * mysql格式化
     * @param sql
     */
    public static void mysql(String sql){
        System.out.println("Mysql格式化：" + SQLUtils.formatMySql(sql));
    }

    /**
     * oracle格式化
     * @param sql
     */
    public static void oracleSql(String sql){
        System.out.println("Oracle格式化：" + SQLUtils.formatOracle(sql));
    }

    /**
     * pgsql格式化
     * @param sql
     */
    public static void PgSql(String sql){
        System.out.println("postgreSql格式化：" + SQLUtils.format(sql, DbType.postgresql));
    }

    /**
     * sql格式
     * @param sql 格式化的语句
     * @param dbType 数据库类型
     */
    public static void sqlFormat(String sql, DbType dbType){
        System.out.println("sql格式化：" + SQLUtils.format(sql, dbType));
    }
}

格式化后如下

Mysql格式化：

SELECT *
	, CASE 
		WHEN UNIX_TIMESTAMP(expire_time) < UNIX_TIMESTAMP(NOW()) THEN 1
		ELSE 0
	END AS state
FROM `expire_time_data`;

Oracle格式化：

SELECT a.TABLE_NAME, b.COMMENTS
FROM user_tables a, user_tab_comments b
WHERE a.TABLE_NAME = b.TABLE_NAME
ORDER BY TABLE_NAME;

postgreSql格式化：

SELECT tablename
FROM pg_tables
WHERE tablename NOT LIKE pg%
	AND tablename NOT LIKE sql_%
ORDER BY tablename;