使用Socket通道读取web页面

import Java.io.IOException;

import java.net.InetSocketAddress;

import java.net.UnknownHostException;

import java.nio.ByteBuffer;

import java.nio.CharBuffer;

import java.nio.channels.SocketChannel;

import java.nio.charset.Charset;

import java.nio.charset.CharsetDecoder;

import java.nio.charset.CharsetEncoder;

public class GetWebPageDemo {

public static void main(String args[]) throws Exception {

String resource, host, file;

int slashPos;

resource = "www.java2s.com/index.htm";

slashPos = resource.indexOf('/'); // find host/file separator

if (slashPos < 0) {

resource = resource + "/";

slashPos = resource.indexOf('/');

}

file = resource.substring(slashPos); // isolate host and file parts

host = resource.substring(0, slashPos);

System.out.println("Host to contact: '" + host + "'");

System.out.println("File to fetch : '" + file + "'");

SocketChannel channel = null;

try {

Charset charset = Charset.forName("ISO-8859-1");

CharsetDecoder decoder = charset.newDecoder();

CharsetEncoder encoder = charset.newEncoder();

ByteBuffer buffer = ByteBuffer.allocateDirect(1024);

CharBuffer charBuffer = CharBuffer.allocate(1024);

InetSocketAddress socketAddress = new InetSocketAddress(host, 80);

channel = SocketChannel.open();

channel.connect(socketAddress);

String request = "GET " + file + " \r\n\r\n";

channel.write(encoder.encode(CharBuffer.wrap(request)));

while ((channel.read(buffer)) != -1) {

buffer.flip();

decoder.decode(buffer, charBuffer, false);

charBuffer.flip();

System.out.println(charBuffer);

buffer.clear();

charBuffer.clear();

}

} 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("\nDone.");

}

}