Nio最简单的Chanel应用

        String infile = "e:\\copy_i.txt"; 
        String outfile = "e:\\copy_o.txt"; 

　　  FileInputStream fin = new FileInputStream(infile); 
        FileOutputStream fout = new FileOutputStream(outfile);  
         
        FileChannel fcin = fin.getChannel(); 
        FileChannel fcout = fout.getChannel();     

        ByteBuffer buffer = ByteBuffer.allocate(1024);  
        while (true) {  
              
            buffer.clear();          

            int r = fcin.read(buffer);   (从in流中读入到缓存区中)
              
            if (r == -1) { 
                break; 
            }  
            

　　　　buffer.flip();  (flip方法把limit值=position值，position值=0,用来反向写出)
            fcout.write(buffer);  (从缓存区中写出到out流中)
        }  
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            InetSocketAddress socketAddress = new InetSocketAddress("www.baidu.com", 80);   
            SocketChannel channel = SocketChannel.open(socketAddress);  
            channel.write(charset.encode("GET " + "/ HTTP/1.1" + "\r\n\r\n"));    
            ByteBuffer buffer = ByteBuffer.allocate(1024);  
            while (channel.read(buffer) != -1) { 
                buffer.flip();   
                System.out.println(Charset.forName("GBK").decode(buffer));  
                buffer.clear();// 清空缓冲

　　　　}   
                

　　　　channel.close();