Velocity的工作过程

Velocity的工作过程主要分为五个阶段

Velocity初始化

创建上下文(Context)

添加数据到上下文中

选择模版

将上下文中的数据与模版融合（merge）

具体实现过程参考一下代码（详细参考APACHE网站）

import java.io.StringWriter;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.Template;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.exception.ParseErrorException;
import org.apache.velocity.exception.MethodInvocationException;

Velocity.init();

VelocityContext context = new VelocityContext();

context.put( "name", new String("Velocity") );

Template template = null;

try
{
template = Velocity.getTemplate("mytemplate.vm");
}
catch( ResourceNotFoundException rnfe )
{
// couldn't find the template
}
catch( ParseErrorException pee )
{
// syntax error: problem parsing the template
}
catch( MethodInvocationException mie )
{
// something invoked in the template
// threw an exception
}
catch( Exception e )
{}

StringWriter sw = new StringWriter();

template.merge( context, sw );