学习笔记I/O篇之二

 

import java.io.*;

public class StreamTest
...{
    public static void main(String args[]) throws  IOException
    ...{
       /** *//**int data;
        while((data=System.in.read())!=-1)
        {
           System.out.write(data);
        }*/
        
        
        //往文件中写入数据,
       /** *//** FileOutputStream fos=new FileOutputStream("fakir.txt");
        fos.write("www.163.com".getBytes());
        fos.close();*/
        

      //从文件中读取数据,
       /** *//** FileInputStream fis=new  FileInputStream("fakir.txt");
        byte[] buf=new byte[100];
        int len=fis.read(buf);
        System.out.println(new String(buf,0,len));
        fis.close();*/
        
        
        //缓存往文件中写入数据,读取数据
        /** *//**FileOutputStream fos=new FileOutputStream("fakir.txt");
        BufferedOutputStream bos=new BufferedOutputStream(fos);
        bos.write("www.163.com".getBytes());
        //fos.flush();//在利用输出流对象继续写入数据，而又想让缓冲区的数据写入硬盘
        bos.close();*/
        
        
        //往文件中读出数据,读取数据
       /** *//** FileInputStream fis=new  FileInputStream("fakir.txt");
        BufferedInputStream bis=new BufferedInputStream(fis);
        byte[] buf=new byte[100];
        int len=bis.read(buf);
        System.out.println(new String(buf,0,len));
        bis.close();*/
        
        
        //写入基本类型的数据
        FileOutputStream fos=new FileOutputStream("fakir.txt");
        BufferedOutputStream bos=new BufferedOutputStream(fos);
        DataOutputStream dos=new DataOutputStream(bos);
        byte b=2;
        int i=124;
        char c='a';
        float f=1.2f;
        
        dos.writeByte(b);
        dos.writeInt(i);
        dos.writeChar(c);
        dos.writeFloat(f);
        
        dos.close();
        
        
        //读出基本的数据类型
        FileInputStream fis=new FileInputStream("fakir.txt");
        BufferedInputStream bis=new BufferedInputStream(fis);
        DataInputStream dis=new DataInputStream(bis);
        System.out.println(dis.readByte());
        System.out.println(dis.readInt());
        System.out.println(dis.readChar());
        System.out.println(dis.readFloat());
        bis.close();
    }
}