NIO-buffer

代码：

package nio.buffer;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;

/** 
* @author songyan
* @date 2020年4月21日 
* @desc: 
*/
public class Test1 {

    public static void main(String[] args) {
        FileChannel fc = null;
        try {
            FileInputStream fis = new FileInputStream("F://test.txt");
            fc = fis.getChannel();
            
            ByteBuffer buffer = ByteBuffer.allocate(10);
            printInfo("init",buffer);
            
            fc.read(buffer);
            printInfo("read",buffer);
            
            buffer.flip();
            printInfo("flip",buffer);
            
            while(buffer.remaining()>0){
                byte b = buffer.get();
                printInfo("get",buffer);
            }
            
            buffer.clear();
            printInfo("clear",buffer);
            
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                fc.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    
    private static void printInfo(String status,ByteBuffer buffer) {
        System.out.println(status+":");
        System.out.println("capacity:"+buffer.capacity()+";position:"+buffer.position()+";limit:"+buffer.limit());
    }
}