scala读写文件 comparing values of types Unit and Int using `!=' will always yield true

由于scala没有对写入文件的支持,所以写文件时通常借助java进行IO操作

 //方式一(小文件)

   /* val s1 = Source.fromFile("D:\\inputword\\hello.txt","GBK");
   val buffer = s1.toList.toArray

   val des = new PrintWriter("C:\\Users\\Administrator\\Desktop\\scalatest.txt");

   des.write(buffer,0,buffer.length);
   des.flush();
   des.close();
   s1.close();
   */

   //方式二(大文件)
   val s2 = Source.fromFile("C:\\Users\\Administrator\\Desktop\\log.data", "UTF-8");

   val buffer = new Array[Char](1024);
   val des = new PrintWriter("C:\\Users\\Administrator\\Desktop\\scalatest.txt");

   val reader = s2.reader();

   var count: Int = 0;

   while ({ count = reader.read(buffer); count } != -1) {
     des.write(buffer, 0, buffer.length);
   }

   //错误(comparing values of types Unit and Int using `!=' will always yield true),在java中这么写没问题,但在scala中赋值过程本身返回的是Unit,如果你想这么用,参考上面的while循环,使用赋值语句块即可
   /*while((count = reader.read(buffer)) != -1) {

   }*/

   des.close();
   des.flush();
   s2.close();