style:hippo4j-bootstrap CheckStyle (#931)

hippo4j-server/hippo4j-bootstrap/src/main/java/cn/hippo4j/server/ServerApplication.java

@@ -22,6 +22,9 @@ import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.transaction.annotation.EnableTransactionManagement;
 
+/**
+ * ServerApplication
+ */
 @EnableTransactionManagement
 @SpringBootApplication(scanBasePackages = "cn.hippo4j")
 @MapperScan(basePackages = {"cn.hippo4j.config.mapper", "cn.hippo4j.auth.mapper"})

hippo4j-server/hippo4j-bootstrap/src/main/java/cn/hippo4j/server/init/LocalDataSourceLoader.java

@@ -35,7 +35,8 @@ import java.io.IOException;
 import java.io.InputStreamReader;
 import java.io.Reader;
 import java.nio.charset.StandardCharsets;
-import java.sql.*;
+import java.sql.Connection;
+import java.sql.DriverManager;
 import java.util.Objects;
 
 /**