velocity第11个应用例子---null处理



如果不做处理，会原样输出
$title

这不是我们期望的

我们希望输出空字符串，应该这样做：$!title

// 2Create a Context object

VelocityContextcontext = new VelocityContext();

// 3 Addyou data object to this context

context.put("title",null);

// 4Choose a template

Templatetemplate = Velocity.getTemplate("null.vm");

// 5Merge the template and you data to produce the output

StringWritersw = new StringWriter();

BufferedWriterbufferWriter = new BufferedWriter(sw);

template.merge(context,bufferWriter);

bufferWriter.flush();

System.out.println(sw.toString());

null.vm

$title

=====

$!title