learning scala write to file scala 写文件功能: scala> import java.io.PrintWriter import java.io.PrintWriter scala> val outputFile = new PrintWriter("text.txt") outputFile: java.io.PrintWriter = java.io.PrintWriter@213c812a scala> outputFile.println("hello panzidong") scala> outputFile.print(...
scala读写文件 def main(args: Array[String]): Unit ={ //1 readfor( i<- Source.fromFile("test.dat").getLines().toArray){ println(i) } // 2 read println(Source.fromFile("test.dat").mkString) //1write val out=newPrintWriter("test.dat")for(i<-1 to 100) out.println(i) out....
object DataCollector { def writeDataToFile(data: String, filename: String): Unit = { val writer = new BufferedWriter(new FileWriter(filename, true)) writer.write(s"${LocalDateTime.now}: $data\n") writer.close() } def main(args: Array[String]): Unit = { val cpuLoad = SystemMonitor....
println:会按行进行保存文件 write:直接写入,不会换行 importjava.io.{File,PrintWriter} 案例——println方法 objectreadDemo{defmain(args:Array[String]):Unit={importjava.io.{File,PrintWriter}valwrite=newPrintWriter(newFile("d://Hello.txt"))//输入文件名称for(i<-1to100){write.println(i)}write.cl...
fromFile("src/main/scala/ScalaStudy/chapter02/test.txt").foreach(print) //(2)将数据写入文件 val writer = new PrintWriter(new File("文件路径/outputtest.txt")) writer.write("hi,my name is wq") writer.close() 二、数据类型 1. 整数类型 val a1: Byte = 127 //Byte正最大区间(8位) ...
val fis = new FileInputStream(new File("C://Users//Administrator//Desktop//test.txt"))val fos = new FileOutputStream(new File("C://Users//Administrator//Desktop//test3.txt"))val buf = new Array[Byte](1024)fis.read(buf)fos.write(buf, 0, 1024)fis.close()fos.close() ...
...读取文件的基本流程如下:(1) 打开要读取的文件(2) 对文件进行读取(3) 关闭文件在向文件中写数据的时候,使用的是Write,那么读取文件中的数据,使用的是Read...Read( )函数返回的是从文件中读取的数据的长度。...,也就是先将从文件中读取的数据存储在该区域内,然后在将区域中的数据取出来,写到磁盘上。
默认当前路径是idea的当前项目路径最顶层Source.fromFile("src/main/resources/test_read.txt","utf-8").foreach(print)//2.将数据写入文件val writer = new PrintWriter(new File("src/main/resources/test_write.txt"))val content ="""hello spark|hello java|hello scala|""".stripMarginwriter.write(...
Type class instances for 'transformers', such asOptionT, present a more subtle challenge.OptionT[F, A]is a wrapper for a value of typeF[Option[A]]. It allows us to write: valot =OptionT(List(Some(1),None)) ot.map((a:Int) => a *2)// OptionT(List(Some(2), None)) ...
"akka.persistence.dispatchers.default-replay-dispatcher" # Storage location of LevelDB files. dir = "journal" # Use fsync on write fsync = on # Verify checksum on read. checksum = off # Native LevelDB (via JNI) or LevelDB Java port native = on } # Shared LevelDB journal plugin (for...