nio read the file, the output file

Io one kind of flow:

package com.cxy.ssp.Automic;

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.util.concurrent.CyclicBarrier;
import java.util.concurrent.atomic.AtomicReferenceFieldUpdater;
import java.util.concurrent.atomic.AtomicStampedReference;
//通过nio实现文件io
public class Demo3 {
    public static void main(String[] args) throws Exception{
        //1 创建输出流
        FileOutputStream fileOutputStream = new FileOutputStream("bas.txt");

　　　　// Construction channel 
        FileChannel Channel = fileOutputStream.getChannel (); 
　　　　　// Create buffer 
        the ByteBuffer Buffer = ByteBuffer.allocate ( 1024 ); 
　　　　　// 
        String STR = " Hello World " ; 
　　　　// the data into the buffer 
        buffer.put ( str.getBytes ()); 

        the try { 
　　　　// tag buffer needs to be emptied, then operation 
            buffer.flip (); 
　　　　　　// write the contents of the channel 
            channel.write (buffer); 
        } the catch (IOException E) { 
            E .printStackTrace (); 
        } 
        fileOutputStream.close (); 
    }

}

com.cxy.ssp.Automic Package; 

Import a java.io.FileInputStream; 
Import java.nio.ByteBuffer,; 
Import the java.nio.channels.FileChannel; 

public  class Demo4 {
     public  static  void main (String [] args) throws Exception {
         / / first build the input stream, 
        the FileInputStream FileInputStream = new new the FileInputStream ( " bas.txt " );
         // flow through the acquisition channel 
        FileChannel channel = fileInputStream.getChannel ();
         // prepare a cache area of 
        the ByteBuffer buffer = ByteBuffer.allocate ( 1024 );
         //Reading data from the channel inside. Byte data 
        channel.read (Buffer);
         // print the contents of 
        the System. OUT .println ( new new String (buffer.array ()));
        // Close 
        fileInputStream.close (); 
    } 
}

package com.cxy.ssp.Automic;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.channels.FileChannel;

public class Demo5 {
    public static void main(String[] args) throws Exception {
        FileInputStream fileInputStream = new FileInputStream("bas.txt");
        FileOutputStream fileOutputStream = new FileOutputStream("b.txt");

        FileChannel channel = fileInputStream.getChannel();
        FileChannel channel1 = fileOutputStream.getChannel();

        channel1.transferFrom(channel,0,channel.size());

        channel1.close();
        channel.close();


    }
}

 

 

Ideas: first constructed input or output stream, and then output or input flow setup channel, channle

Create a buffer, operates operation, the channel buffer zone

 

The above code Summary:

1 input and output is in terms with your computer, computer output to the accident, is the output, the computer is input

2 output stream of data bytes needed to put inside the buffer,

3 input streams: the data need not be put inside the buffer, then only the channel from which data can be read