92 lines
3.3 KiB
Java
92 lines
3.3 KiB
Java
import java.net.*;
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import java.io.*;
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import javax.net.ssl.*;
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/* java SSLSocketClient taken from
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* https://docs.oracle.com/javase/10/security/sample-code-illustrating-secure-socket-connection-client-and-server.htm
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* License: Unknown, not GPLv2
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*/
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/*
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* This example demonstrates how to use a SSLSocket as client to
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* send a HTTP request and get response from an HTTPS server.
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* It assumes that the client is not behind a firewall.
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* The handshake doesn't include any ALPN protocols. See
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* https://docs.oracle.com/javase/8/docs/technotes/guides/security/jsse/alpn.html
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* for more documentation.
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*/
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public class SSLSocketClient {
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public static void main(String[] args) throws Exception {
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String host=args[0];
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if ( args == null || args.length == 0 || host.trim().isEmpty() ) {
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System.out.println("You need to supply a valid hostname");
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} else {
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try {
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SSLSocketFactory factory =
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(SSLSocketFactory)SSLSocketFactory.getDefault();
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SSLSocket socket =
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(SSLSocket)factory.createSocket(host, 443);
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/*
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* send http request
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*
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* Before any application data is sent or received, the
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* SSL socket will do SSL handshaking first to set up
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* the security attributes.
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*
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* SSL handshaking can be initiated by either flushing data
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* down the pipe, or by starting the handshaking by hand.
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*
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* Handshaking is started manually in this example because
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* PrintWriter catches all IOExceptions (including
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* SSLExceptions), sets an internal error flag, and then
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* returns without rethrowing the exception.
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*
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* Unfortunately, this means any error messages are lost,
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* which caused lots of confusion for others using this
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* code. The only way to tell there was an error is to call
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* PrintWriter.checkError().
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*/
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socket.startHandshake();
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PrintWriter out = new PrintWriter(
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new BufferedWriter(
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new OutputStreamWriter(
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socket.getOutputStream())));
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out.println("GET / HTTP/1.1");
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out.println("Host: " + host);
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out.println("Connection: close");
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out.println();
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out.flush();
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/*
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* Make sure there were no surprises
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*/
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if (out.checkError())
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System.out.println(
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"SSLSocketClient: java.io.PrintWriter error");
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/* read response */
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BufferedReader in = new BufferedReader(
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new InputStreamReader(
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socket.getInputStream()));
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String inputLine;
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while ((inputLine = in.readLine()) != null)
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System.out.println(inputLine);
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in.close();
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out.close();
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socket.close();
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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}
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