我希望有人可以提供帮助,我是scala的新手,并且在将输出写入文本文件时遇到一些问题。
我有一个数据表,并且编写了一些代码来一次一行地读取它,做我想做的事情,现在我需要它来将该行写到一个文本文件中。
因此,例如,我有下表的数据类型
名称,日期,goX,goY,stopX,stopY
1,12/01/01,1166,2299,3300,4477
我的代码采用goX和goY的第一个字符并创建一个新数字,在这种情况下为1.2,对stopX和stopY进行相同操作,因此在本例中为3.4
我想在文本文件中得到的基本上是以下内容:
走停
1.2、3.4
并且我希望它经过数百行,直到文本文件中包含一长串的开关为止。
我当前的代码如下,这几乎肯定不是最优雅的解决方案,但这是我有史以来第一个scala / java代码:
import scala.io.Source
object FT2 extends App {
for(line<-Source.fromFile("C://Users//Data.csv").getLines){
var array = line.split(",")
val gox = (array(2));
val xStringGo = gox.toString
val goX =xStringGo.dropRight(1|2)
val goy = (array(3));
val yStringGo = goy.toString
val goY = yStringGo.dropRight(1|2)
val goXY = goX+"."+goY
val stopx = (array(4));
val xStringStop = stopx.toString
val stopX =xStringStop.dropRight(1|2)
val stopy = (array(3));
val yStringStop = stopy.toString
val stopY = yStringStop.dropRight(1|2)
val stopXY = stopX+"."+stopY
val GoStop = List(goXY,stopXY)
//This is where I want to print GoStop to a text file
}
任何帮助深表感谢!
应该这样做:
import java.io._
val data = List("everything", "you", "want", "to", "write", "to", "the", "file")
val file = "whatever.txt"
val writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)))
for (x <- data) {
writer.write(x + "\n") // however you want to format it
}
writer.close()
但是,您可以通过创建一个自动为您关闭内容的方法来使它更好一点:
def using[T <: Closeable, R](resource: T)(block: T => R): R = {
try { block(resource) }
finally { resource.close() }
}
using(new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)))) {
writer =>
for (x <- data) {
writer.write(x + "\n") // however you want to format it
}
}
所以:
using(new BufferedWriter(new OutputStreamWriter(new FileOutputStream("output.txt")))) {
writer =>
for(line <- io.Source.fromFile("input.txt").getLines) {
writer.write(line + "\n") // however you want to format it
}
}
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我来说两句