import java.io.*;
public class Iojava {
    public static void main(String[] args) throws Exception {
    File f=new File("D:"+File.separator+"text.txt");
    InputStream In=null;
    In=new FileInputStream(f);
    byte[] b=new byte[1024];
    int temp=0;
    int len=0;
    while((temp=In.read())!=-1)
    {
        System.out.print("temp 的值为："+temp);
        len++;
        System.out.println("   len的值为"+len);
        
    }
    In.close();
    }}