如果希望把每天出错的信息写入日志文件，每天新建一个文件。

package test.scala
import java.io.{File, FileWriter}
import java.text.SimpleDateFormat
import java.util.{Calendar, Date}
import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent.Future

object LogWriter {
  private val logDirectory = new File("D:\\data\\log")
  private val dateFormat = new SimpleDateFormat("yyyy-MM-dd")
  private val lock = new Object()

  private def createLogFile(): File = {
    val currentDate = dateFormat.format(new Date())
    val logFileName = s"$currentDate.log"
    val logFile = new File(logDirectory, logFileName)

    if (!logDirectory.exists()) {
      logDirectory.mkdirs()
    }

    if (!logFile.exists()) {
      logFile.createNewFile()
    }

    logFile
  }

  def writeLog(content: String): Unit = {
    lock.synchronized {
      val logFile = createLogFile()
      val currentTime = Calendar.getInstance().getTime
      val dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
      val formattedTime = dateFormat.format(currentTime)
      //val logLine = s"$content\n"
      val logLine = s"$formattedTime: $content\n"

      val fileWriter = new FileWriter(logFile, true)
      fileWriter.write(logLine)
      fileWriter.close()
    }
  }

  def main(args: Array[String]): Unit = {
    LogWriter.writeLog("日志测试一")
    LogWriter.writeLog("日志测试二")
    LogWriter.writeLog("日志测试三")
  }
}

日志文件内容：