Networking Section Index | Page 17
How do I stop my HTTP URL connections from following redirects?
The HttpURLConnection class has a setFollowRedirects() method that allows you to disable this feature. By default, it is enabled. However, if you call setFollowRedirects() with an argument of fals...more
I'm using Java sockets to exchange data with a server written in C. How can I convert my integer values to Network Byte Order so the C server can read them properly?
Because different operating systems have different
integer representations, when you send integers over a socket from a
C or C++ program it is important to use the functions htons(),
htonl(), n...more
How do I create an SSL socket from a Java applet?
How do I create an SSL socket from a Java
applet?
How can my application or applet programmatically use HTTPS to talk to a servlet? Can I do it with just the Java 2 SDK?
In order to use secure sockets, you need an SSL implementation.
this is not provided in the Java 2 SDK.
If you are running an applet, the major browsers provide support
for HTTPS through the ja...more
When retrieving data over HTTP, how do I monitor server response codes? For example, if the server I am connecting to redirects (response code 3xx), how can I tell and how do I get the new host name?
The FAQ How do I download files from a URL using HTTP?
shows you how to get the data from a URL; to get the headers you need to do a few more things.
HTTP returns its response code in the first...more
Why are there no constructors for the InetAddress class?
It is often considered a bad idea to
do I/O in a constructor, and all three InetAddress factory methods
(getLocalHost, getByName,
and getAllByName)
need to perform I/O.
more
I need to build some FTP capabilities into my client. Is there open source for FTP clients in Java?
You can find some interesting stuff here:
http://remus.rutgers.edu/~jszabo/myjava/Ftp.html.
But also a much more powerful one here:
http://www.public.wit.edu/students/kojima/index.html
more
Can I run Jini on my TINI?
No, not currently (TINI OS beta 3.0).
TINI doesn't support serialization or RMI. While
RMI is not explicitly required by the Jini specification, in practice
many Jini services use RMI, and in pa...more
What is the difference between Jini and JavaSpaces?
JavaSpaces is built on top of Jini. It is, to quote "JavaSpaces Principles, Patterns, and Practice",
a "... shared, network-accessible repository for objects."
Jini provides a framework for dist...more
What is JavaSpaces?
The JavaSpaces technology is written in the Java programming language, and is a Jini technology service. It is a simple, fast, and unified mechanism for sharing, coordinating, and communicating di...more
How do I use the nonstandard sun.net.ftp.FtpClient class to FTP a file from a server?
While this class is completely unsupported and it may not be available on a user's runtime, you can use it when available. The following program demonstrates its usage. For some reason the closeSe...more
What is the range of valid ports for a ServerSocket to listen to?
You can create a server on ports 1 through 65535. Port numbers less than 256 are reserved for well-known services (like HTTP on port 80) and port numbers less than 1024 require root access on
UNIX...more
How can I get the real local host IP address in an applet?
Applet security restrictions do not let you get this in an untrusted applet via InetAddress.getLocalHost().
However, you can get this address by creating a Socket connection back to the web server...more
How do I get the real local host IP address in an application (or trusted applet)?
The InetAddress class provides the necessary support:
InetAddress localHost = InetAddress.getLocalHost();
System.out.println(localHost.getHostName());
System.out.println(localHost.getHostAddress(...more
When I connect to a URL from my applet, I get a security exception, why?
Untrusted applets are restricted to only communicate back to the host that delivered the applet. You cannot open a connection to any other URL besides the one from which the applet came.
