| 1 Groovlets: Writing Servlets in Groovy |
| |
| You can write normal Java servlets in Groovy. |
| There is also a {link:GroovyServlet|http://groovy.codehaus.org/apidocs/groovy/servlet/GroovyServlet.html} which automatically compile your .groovy |
| source files, turn them into bytecode, load the Class and cache it until you |
| change the source file. |
| |
| Here's a simple example to show you the kind of thing you can do from a Groovlet. |
| Notice the use of implicit variables to access the session, output & request. |
| |
| {code:groovlet} |
| import java.util.Date |
| |
| if (session.counter == null) { |
| session.counter = 1 |
| } |
| |
| out.println(<<<EOS |
| <html> |
| <head> |
| <title>Groovy Servlet</title> |
| </head> |
| <body> |
| Hello, ${request.remoteHost}: ${session.counter}! ${new Date()} |
| <br>src |
| </body> |
| </html> |
| EOS) |
| |
| session.counter = session.counter + 1 |
| {code} |
| |
| 1.1 Setting up groovylets |
| |
| Put the following in your web.xml: |
| |
| {code:xml} |
| <servlet> |
| <servlet-name>Groovy</servlet-name> |
| <servlet-class>groovy.servlet.GroovyServlet</servlet-class> |
| </servlet> |
| |
| <servlet-mapping> |
| <servlet-name>Groovy</servlet-name> |
| <url-pattern>*.groovy</url-pattern> |
| </servlet-mapping> |
| {code} |
| |
| |
| Then all the groovy jar files into WEB-INF/lib. (You should only need to put |
| the groovy jar and the asm jar). |
| |
| Now put the .groovy files in, say, the root directory (i.e. where you would put your html files). The |
| groovy servlet takes care of compiling the .groovy files. |
| |
| |
| So for example using tomcat you could edit tomcat/conf/server.xml like so: |
| |
| {code:xml} |
| <Context path="/groovy" docBase="c:/groovy-servlet"/> |
| {code} |
| |
| Then access it with http://localhost:8080/groovy/hello.groovy |
