Java NIO服务器端开发详解

public class NioTest{  public static void main(String[] args) throws IOException  {    copyFile();  }  //拷贝文件  private static void copyFile()  {    FileInputStream in=null;    FileOutputStream out=null;    try    {      in=new FileInputStream("src/main/java/data/in-data.txt");      out=new FileOutputStream("src/main/java/data/out-data.txt");      FileChannel inChannel=in.getChannel();      FileChannel outChannel=out.getChannel();      ByteBuffer buffer=ByteBuffer.allocate(1024);      int bytesRead = inChannel.read(buffer);      while (bytesRead!=-1)      {        buffer.flip();        outChannel.write(buffer);        buffer.clear();        bytesRead = inChannel.read(buffer);      }    }    catch (FileNotFoundException e)    {      // TODO Auto-generated catch block      e.printStackTrace();    } catch (IOException e)    {      // TODO Auto-generated catch block      e.printStackTrace();    }    }  //写文件  private static void writeFileNio()  {    try    {      RandomAccessFile fout = new RandomAccessFile("src/main/java/data/nio-data.txt", "rw");      FileChannel fc=fout.getChannel();      ByteBuffer buffer=ByteBuffer.allocate(1024);      buffer.put("hi123".getBytes());      buffer.flip();      try      {        fc.write(buffer);      } catch (IOException e)      {        // TODO Auto-generated catch block        e.printStackTrace();      }    }     catch (FileNotFoundException e)    {      // TODO Auto-generated catch block      e.printStackTrace();    }  }  //读文件  private static void readFileNio()  {    FileInputStream fileInputStream;    try    {      fileInputStream = new FileInputStream("src/main/java/data/nio-data.txt");      FileChannel fileChannel=fileInputStream.getChannel();//从 FileInputStream 获取通道      ByteBuffer byteBuffer=ByteBuffer.allocate(1024);//创建缓冲区      int bytesRead=fileChannel.read(byteBuffer);//将数据读到缓冲区      while(bytesRead!=-1)      {                byteBuffer.flip();        //hasRemaining():告知在当前位置和限制之间是否有元素        while (byteBuffer.hasRemaining())        {          System.out.print((char) byteBuffer.get());        }                byteBuffer.clear();        bytesRead = fileChannel.read(byteBuffer);      }    } catch (FileNotFoundException e)    {      // TODO Auto-generated catch block      e.printStackTrace();    } catch (IOException e)    {      // TODO Auto-generated catch block      e.printStackTrace();    }  }}