package exer; 输入流 import java.io.File; public class FileInputStream { public static void main(String[] args) { FileInputStream fis=null; try { File file =new File("hello.txt"); fis = new FileInputStream(); byte[] b=new byte[5];//读取的数据要存入的数组 int len;//每次读入到byte字节中的长度 while((len = fis.read(b)!=-1)){ for(int i=0;i<=len;i++){ System.out.print( (char) b[i]); } } } catch (Exception e) { e.printStackTrace(); }finally{ if(fis!=null) try { fis.close(); } catch (Exception e) { e.printStackTrace(); } } } }