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Socket s = new Socket(InetAddress.getByName("stackoverflow.com"), 80);
PrintWriter pw = new PrintWriter(s.getOutputStream());
pw.println("GET / HTTP/1.1");
pw.println("Host: caiyongji.com");
pw.println("");
pw.flush();
BufferedReader br = new BufferedReader(new InputStreamReader(s.getInputStream()));
String t;
while((t = br.readLine()) != null) System.out.println(t);
br.close();

用 Java 自帶的 HttpURLConnection 是做不到的，詳情參考：
http://bugs.java.com/bugdatab...

可以考慮自己用 Socket 發(fā)送簡(jiǎn)單的 HTTP 請(qǐng)求，或者用第三方庫(kù)。以 Apache HttpClient 為例：

HttpClient client = new DefaultHttpClient(); 
client.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_0);