快学Scala 第十五课 （二进制读取文件，写文件，访问目录，序列化）

二进制读取文件：

val file = new File("F:\\scalaWorkspace\\ScalaLearning\\files\\test.txt") val in = new FileInputStream(file) val bytes = new Array[Byte](file.length().toInt) in.read(bytes) in.close()

写文件：

val out = new PrintWriter("F:\\scalaWorkspace\\ScalaLearning\\files\\test2.txt") for (i <- 1 to 100) out.println(i) out.close()

访问目录：

def subdirs(dir: File): Iterator[File] = { val children = dir.listFiles.filter(_.isDirectory()) children.toIterator ++ children.toIterator.flatMap(subdirs _) } val dir = new File("F:\\scalaWorkspace\\ScalaLearning") for(el <- subdirs(dir)){ println(el.getAbsolutePath) }

运行结果：

F:\scalaWorkspace\ScalaLearning\.settingsF:\scalaWorkspace\ScalaLearning\binF:\scalaWorkspace\ScalaLearning\filesF:\scalaWorkspace\ScalaLearning\src

序列化：

@SerialVersionUID(18L) class Animal extends Serializable { val id: Int = 1 val name1: String = "Animal" }

 

转载于:https://www.cnblogs.com/AK47Sonic/p/7375992.html

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