client.html
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<TITLE>Creating an SSL Client Socket
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
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<A HREF="../index.html">List of Packages</A>
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<B><A HREF="../javax.net.ssl/pkg.html">javax.net.ssl</A></B><font color="#666666" SIZE="-2">
[4 examples]
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<h3>
e499.
Creating an SSL Client Socket</h3>
When an SSL client socket connects to an SSL server, it receives a
certificate of authentication from the server. The client socket then
validates the certificate against a set of certificates in its \meta{trust
store}.
<P> The default truststore is <code><java-home>/lib/security/cacerts</code>.
If the server's certificate cannot be validated with the certificates
in the truststore, the server's certificate must be added to the
truststore before the connection can be established.
<pre>
try {
int port = <font color="#0066ff"><i>443</i></font>;
String hostname = <font color="#0066ff"><i>"hostname"</i></font>;
SocketFactory socketFactory = SSLSocketFactory.getDefault();
Socket socket = socketFactory.createSocket(hostname, port);
// Create streams to securely send and receive data to the server
InputStream in = socket.getInputStream();
OutputStream out = socket.getOutputStream();
// Read from in and write to out...
// Close the socket
in.close();
out.close();
} catch(IOException e) {
}
</pre>
<P> A different truststore can be specified using the
<code>javax.net.ssl.trustStore</code> system property. (If you are trying to set
up an SSL client and server for testing purposes, you can set the
truststore to the keystore that was created in
<a href="../javax.net.ssl/Server.html" class="eglink"><font size="-1"><b>e500</b> Creating an SSL Server Socket</font></a>.)
<pre>
> java -Djavax.net.ssl.trustStore=<font color="#0066ff"><i>truststore</i></font> -Djavax.net.ssl.trustStorePassword=<font color="#0066ff"><i>123456</i></font> <font color="#0066ff"><i>MyApp</i></font>
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Related Examples
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e500. <a class="eglink" href="Server.html?l=rel">
Creating an SSL Server Socket
</a>
<br>
e501. <a class="eglink" href="GetCert.html?l=rel">
Retrieving the Certification Path of an SSL Server
</a>
<br>
e502. <a class="eglink" href="TrustAll.html?l=rel">
Disabling Certificate Validation in an HTTPS Connection
</a>
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