Java Glossary : HTTP client

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HTTP client

If you want to write an Applet or application or Java Webstart app, that automates what you would do with a browser, you need to speak HTTP client protocols. You need to be able to GET and POST. You want to be able to talk to webservers to fetch files, talk to CGI server to send and receive data or to servlet wombs to send and receive data. Sometimes you want to analyse the responses. Sometimes you just want the browser to render it. Marty Hall's book is the best place to learn how to do this.

Core Web Programming, Second Edition

0-13-089793-0

Marty Hall and Gary Cornell

1250 pages. This is a great doorstop of a book. It has a few chapters on client-server programming in Java, and a section of that is on CGI. I have looked at hundreds of Java books and found nothing that deals in depth with client side Java talking to CGI, except Marty's book. It is really very simple and he does an excellent job of explaining it. Marty has posted all the source code examples from the book for anyone to use. These contain updates and errata fixes you don't get on the CD-ROM that comes with the book.

The file IO Amanuensis will generate code for you to handle simple HTTP situations.

You can do your work via general purpose HTTP-client libraries. These are probably overkill in most cases. You would spend more time learning these packages than you would learning how to accomplish the same thing more efficiently with raw sockets, java.net.URLConnection, java.net.HttpURLConnection, javax.net.ssl.HttpsURLConnection and javax.net.ssl.HttpsURLConnection, However, if you have a complex task, check them out.

CGI ¤ HTTP

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