多用于读取硬盘中数据：
Scanner mScanner=new Scanner(new FileInputStream(new File(“C:\AutoSubmit.java”)));
mScanner.nextLine();//读取的数据

//逐行扫描文件，并逐行输出  
public static void main(String[] args) throws FileNotFoundException {   
    InputStream in = new FileInputStream(new File("C:\\AutoSubmit.java"));   
    Scanner s = new Scanner(in);   
    while(s.hasNextLine()){   
            System.out.println(s.nextLine());   
    }   
}