bufferedtest.java

java应用开发详解

import java.io.*;

class BufferedTest
{
    public static void main(String[] args) 
    {
        try 
        {
            FileInputStream in = new FileInputStream(new File("test.txt"));
            
            //创建一个1k的缓冲区
            BufferedInputStream bufin = new BufferedInputStream(in, 1024);
            
            int count, half = bufin.available()/2;

            //当前位置添加一个标识
            bufin.mark(18);
            //跳跃前一半
            bufin.skip(half);        

	    System.out.println("tail half:");
            byte[] buf = new byte[1024];
            
            //count是读入缓冲区的总数，当前值应该为9
            while ((count=bufin.read(buf, 0, buf.length)) > 0)
                for (int i = 0; i<count; i++)
                    System.out.print((char)buf[i]);
                    
	    bufin.reset();
	    System.out.println();
	    System.out.println("total:");
	    int c;
            while ((c=bufin.read()) >= 0)   
                System.out.print((char)c);
                
            System.out.flush();
            
            bufin.close();
        }
        catch (IOException e) 
        {
            e.printStackTrace();
        }
    }
}