Velocity 11th Application Example---NULL processing

If it is not processed, it will be output as-is
$title

It's not what we expect.

We want to output an empty string and should do this: $!title

2Create a Context objectvelocitycontextcontext = new Velocitycontext ();//3 Addyou data object to this CONTEXTCONTEXT.P UT ("title", null);//4Choose a templatetemplatetemplate = Velocity.gettemplate ("NULL.VM");//5Merge the template and you D ATA to produce the OUTPUTSTRINGWRITERSW = new StringWriter (); Bufferedwriterbufferwriter = new BufferedWriter (SW); Template.merge (Context,bufferwriter); Bufferwriter.flush (); System.out.println (Sw.tostring ()); Null.vm$title=====$!title

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