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Networking (java.net.*)

This category is meant for anyone programming TCP/UDP/IP applications in Java. It contains several subcategories TCP, UDP, and Applications/Protocols with for each of them a number of related sites and frequently asked questions. If you answer any of the questions in this category, please provide lots of code examples!

Related Categories

Remote Method Invocation (java.rmi.*), JSSE (Java Secure Socket Extension)

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Questions & Answers
= answered, = unanswered

General:

  How do I get the IP address of a host?
  How do I get the hostname of an IP address?
  How do I get the IP of the localhost?
  How do I download a remote file to a local file?
  How do I connect to the net through a proxy server?
  How do I check for errors when connecting to a URL?
  Are my HTTP requests cached?
  How do I timeout on a network connection?
  How do I send email through SMTP with Java?
  How do I read email through POP3 with Java?
  How do I encode and decode a URL?
  How do I get the contents of a URL?
  How do I read an image from a URL?
  How do I make a chat client and server?
  How do I execute a CGI script from within my program?
  What does the setSoLinger option do?
  What does the setTcpNoDelay option do?
  How do I launch the default browser?
  How do I bring up the dial-up networking connection window?
  How do I check the last-modified date of a URL file?
  How do I get the file size of a URL file?
  How do I get a page when HTTP authentification is required?
  What are the possible HTTP response codes?
  How do I ping a host?
  How do I get the date from a server?
  How do I download a secure page (HTTPS) with Java?
  How do I determine whether an IP address is a multicast address?
  How do I set a timeout for read when I'm using the class HttpURLConnection?
  Where do I get a list of network properties that can be tweaked?
  How do I get a list of network interfaces installed on my machine?
  How do I obtain the MAC address?


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