怎么使用java.nio.*类来实现将网站的响应内容返回？？？马上给分！！

Question

给你个示例，改一下就可以，用的nio的非阻塞模式import java.io.*;
import java.net.*;
import java.nio.*;
import java.nio.channels.*;
import java.nio.charset.*;
import java.util.*;
public class NonBlockingReadURL {
  static Selector selector;  public static void main(String args[]) {
    String host = args[0];
    SocketChannel channel = null;    try {      // Setup
      InetSocketAddress socketAddress = 
        new InetSocketAddress(host, 80);
      Charset charset = 
        Charset.forName("ISO-8859-1");
      CharsetDecoder decoder = 
        charset.newDecoder();
      CharsetEncoder encoder = 
        charset.newEncoder();      // Allocate buffers
      ByteBuffer buffer = 
        ByteBuffer.allocateDirect(1024);
      CharBuffer charBuffer = 
        CharBuffer.allocate(1024);      // Connect
      channel = SocketChannel.open();
      channel.configureBlocking(false);
      channel.connect(socketAddress);      // Open Selector
      selector = Selector.open();      // Register interest in when connection
      channel.register(selector, 
        SelectionKey.OP_CONNECT | 
          SelectionKey.OP_READ);      // Wait for something of interest to happen
      while (selector.select(500) > 0) {
        // Get set of ready objects
        Set readyKeys = selector.selectedKeys();
        Iterator readyItor = readyKeys.iterator();        // Walk through set
        while (readyItor.hasNext()) {          // Get key from set
          SelectionKey key = 
            (SelectionKey)readyItor.next();          // Remove current entry
          readyItor.remove();          // Get channel
          SocketChannel keyChannel = 
            (SocketChannel)key.channel();          if (key.isConnectable()) {            // Finish connection
            if (keyChannel.isConnectionPending()) {
              keyChannel.finishConnect();
            }            // Send request
            String request = 
                 "GET / \r\n\r\n";
            keyChannel.write(encoder.encode(
              CharBuffer.wrap(request)));          } else if (key.isReadable()) {            // Read what's ready in response
            keyChannel.read(buffer);
            buffer.flip();            // Decode buffer
            decoder.decode(buffer, 
              charBuffer, false);            // Display
            charBuffer.flip();
            System.out.print(charBuffer);            // Clear for next pass
            buffer.clear();
            charBuffer.clear();          } else {
            System.err.println("Ooops");
          }
        }
      }
    } catch (UnknownHostException e) {
      System.err.println(e);
    } catch (IOException e) {
      System.err.println(e);
    } finally {
      if (channel != null) {
        try {
          channel.close();
        } catch (IOException ignored) {
        }
      }
    }
    System.out.println();
  }
}