如何将所有日志输出写入spring boot文件

 ```properties

 # 设置日志输出到文件

 logging.file.name=logs/mylog.log

 ```

 ```properties

 # 设置日志输出到文件

 logging.config=classpath:log4j2.xml

 ```

 ```xml

 <?xml version="1.0" encoding="UTF-8"?>

 <configuration>

     <appender name="FILE" class="ch.qos.logback.core.FileAppender">

         <file>${LOG_FILE}</file>

         <encoder>

             <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>

         </encoder>

     </appender>

     <root level="info">

         <appender-ref ref="FILE" />

     </root>

 </configuration>

 ```

 ```xml

 <?xml version="1.0" encoding="UTF-8"?>

 <Configuration status="WARN">

     <Appenders>

         <File name="File" fileName="${sys:LOG_FILE}">

             <PatternLayout pattern="%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n" />

         </File>

     </Appenders>

     <Loggers>

         <Root level="info">

             <AppenderRef ref="File" />

         </Root>

     </Loggers>

 </Configuration>

 ```

   private static final Logger logger = LoggerFactory.getLogger(MyClass.class);

   public void myMethod() {

       logger.info("This is a log message.");

   }