1 Test Web applications with HttpUnit
（太简单，有些技巧总结）http://www.javaworld.com/javaworld/jw-04-2004/jw-0419-httpunit.html?page=1
2 offical tutorial
http://www.httpunit.org/doc/tutorial/task1.html
3 Build a Java Web App Using HttpUnit and the Test-driven Methodology
suggested by offical junit
http://www.devx.com/Java/Article/17908
http://www.devx.com/Java/Article/17991?trk=DXRSS_JAVA