nio client

import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.util.Iterator;

public class Client {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Client client = new Client();
client.start();
}

public void start() {
Selector selector = null;
System.out.println("start ... ");
try {
SocketChannel channel = SocketChannel.open();
channel.connect(new InetSocketAddress("", 80));
channel.configureBlocking(false);

selector = Selector.open();
channel.register(selector, SelectionKey.OP_WRITE);

} catch (Exception e) {
e.printStackTrace();
}

Charset charset = Charset.forName("UTF-8");
CharsetDecoder decoder = charset.newDecoder();
CharsetEncoder encoder = charset.newEncoder();
CharBuffer charBuffer = CharBuffer.allocate(1024);
ByteBuffer buffer = ByteBuffer.allocate(1024 * 5);
StringBuffer result = new StringBuffer();


while(true) {
try {
int index = selector.select();
System.out.println(index);
if(index > 0) {
Iterator it = selector.selectedKeys().iterator();
//System.out.println(it);
while(it.hasNext()) {
SelectionKey key = (SelectionKey) it.next();
it.remove();

if(key.isReadable()) {
key.cancel();
System.out.println("read");

SocketChannel channel = (SocketChannel) key.channel();
//channel.socket().setSoTimeout(1000);
while(channel.read(buffer) != -1) {
buffer.flip();
decoder.decode(buffer, charBuffer, false);
charBuffer.flip();
System.out.println(charBuffer.toString());
result.append(charBuffer);
buffer.clear();
charBuffer.clear();
}

//System.out.println(result);
channel.finishConnect();
channel.close();
System.out.println("end.");
} else if(key.isWritable()) {

System.out.println("write");
SocketChannel channel = (SocketChannel) key.channel();

channel.write(encoder.encode(CharBuffer.wrap("GET / HTTP/1.0\r\n")));
channel.write(encoder.encode(CharBuffer.wrap("accept: www/source; text/html; image/gif; image/jpeg; */*\r\n")));
channel.write(encoder.encode(CharBuffer.wrap("User_Agent: myAgent\r\n")));
channel.write(encoder.encode(CharBuffer.wrap("\r\n")));
//strs[0] = "GET / HTTP/1.0";
//strs[1] = "accept: www/source; text/html; image/gif; image/jpeg; */*";
//strs[2] = "User_Agent: myAgent";

channel.configureBlocking(false);
channel.register(selector, SelectionKey.OP_READ);
//key.cancel();
}
}
}
} catch(Exception e) {
e.printStackTrace();
}
}
}
}