如果我們想得到當前主機與遠端主機是否連線，或者我們想做一個小型瀏覽器，我們需要使用socket寫一個請求報文。廢話少說，上程式碼。

public class Main
{

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		// TODO Auto-generated method stub
		Socket socket = null;
		OutputStream outputStream = null;
		InputStream inputStream = null;
		BufferedReader bufferedReader = null;
		try
		{
			socket = new Socket("www.baidu.com", 80);
			//post請求，請求實體放伺服器需要的客戶端資料，首部行後面需要一個空行，所以最後\r\n
			String postString = "POST / HTTP/1.0" + "\r\n"
					+ "Host:www.baidu.com:80" + "\r\n\r\n";
			//get請求，請求實體為空
			String getString = "GET / HTTP/1.0" + "\r\n"
					+ "Host:www.baidu.com:80" + "\r\n\r\n";
			//head請求，只返回報文頭部，不返回請求物件
			String headString="HEAD / HTTP/1.0" + "\r\n"
					+ "Host:www.baidu.com:80" + "\r\n\r\n";
			System.out.println("請求報文：\r\n" + getString);
			outputStream = socket.getOutputStream();
			outputStream.write(getString.getBytes());
			outputStream.flush();

			inputStream = socket.getInputStream();
			bufferedReader = new BufferedReader(new InputStreamReader(
					inputStream));
			String readData = null;
			System.out.println("響應報文：\r\n");
			while ((readData = bufferedReader.readLine()) != null)
			{
				System.out.println(readData);
			}
		} catch (UnknownHostException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e)
		{
			// TODO Auto-generated catch block
			e.printStackTrace();
		} finally
		{
			try
			{
				if (outputStream != null)
					outputStream.close();
				if (bufferedReader != null)
					bufferedReader.close();
				if (inputStream != null)
					inputStream.close();
				if (socket != null)
					socket.close();
			} catch (IOException exception)
			{
				exception.printStackTrace();
			}
		}
	}