wspeirs

  Options options = new Options();
  
  // create the simple option without using the OptionBuilder
  options.addOption("o", "opt", false, "An option, no args");
  
  // simple help option using the builder
  options.addOption(OptionBuilder.withLongOpt("help")
                                 .create("h"));
  
  // an option with a value separator, defaults to =

wspeirs

final GnuParser parser = new GnuParser();
final Options options = configureOptions();

// parse with the parser
CommandLine cmdLine = null;
try {
    cmdLine = parser.parse(options, args);
} catch(ParseException e) {
    e.printStackTrace();
    return;

wspeirs

// check to see if they need help
// notice we only use the short-version, but it checks both!
if(cmdLine.hasOption("h")) {
    new HelpFormatter().printHelp("sop4j-cli", options);
    return;
}

// check to see if they passed in an opt
// recommended to use the long version as it's more readable
if(cmdLine.hasOption("opt")) {

wspeirs

// create the velocity engine
final VelocityEngine velocity = new VelocityEngine();

// set the logger to our Log4J root logger
velocity.setProperty("runtime.log.logsystem.log4j.logger", "root");

// use the resource loader as it's easy with Maven's path setup
velocity.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
velocity.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());

wspeirs

// create the context to set all the variables
final VelocityContext context = new VelocityContext();

// setup the context
context.put("user", new UserBean("bill"));
context.put("site", "www.sop4j.com");
context.put("articles", Arrays.asList(new ArticleBean("Welcome"),
                                      new ArticleBean("Parsing the Command Line"),
                                      new ArticleBean("Document Templating or Mail Merge")));

wspeirs

// get the template
final Template template = velocity.getTemplate("my_template.vm");
final StringWriter sw = new StringWriter();

// merge the template and context
template.merge(context, sw);

// print out the resulting document
System.out.println(sw.toString());

wspeirs

## this is a single-line comment in the template
Dear ${user.Name}- ## notice we use the formal directive here because we want the - right after the variable

This is an e-mail because you signed up for $site and we're really happy that you did.
#*
 This is how you check to see if a value is null
 This is also a multi-line comment
*#
#if( $message )
This special message won't be shown because our \$message is null

wspeirs

Dear Bill- 
This is an e-mail because you signed up for www.sop4j.com and we're really happy that you did.


Here are 3 cool articles you can read:

- Welcome
- Parsing the Command Line
- Document Templating or Mail Merge

wspeirs

    @Subscribe
    public void getIntegerEvent(Integer event) throws InterruptedException {
        TimeUnit.MILLISECONDS.sleep(sleep);
        System.out.println(System.currentTimeMillis() + ":\t" + name + " got " + event);
    }

wspeirs

  final DescriptiveStatistics descriptiveStats = new DescriptiveStatistics(); // stores values
  final SummaryStatistics summaryStats = new SummaryStatistics(); // doesn't store values
  final Frequency frequency = new Frequency();

  // add numbers into our stats
  for(int i=0; i < NUM_VALUES; ++i) {
      values[i] = rng.nextInt(MAX_VALUE);

      descriptiveStats.addValue(values[i]);
      summaryStats.addValue(values[i]);