填空题 import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; public class FileStreamSimpleExample { public static void main(String[] args) { File inputFile = new File("input.txt"); File outputFile = new File("output.txt"); FileInputStream fis = null; FileOutputStream fos = null; try { fis = ①________; fos = new FileOutputStream(outputFile); int data; while ((data = fis.read())!=-1) { fos.write(data); } catch (②________ ) { System.out.println("文件操作出现错误"); } finally { if (fis!= null) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } if (fos!= null) { try { fos.close(); } catch (IOException e) { e.printStackTrace(); } } } } } }