我们的网站使用Apache Velocity模板语言。我们的内容管理系统已经检查任何生成的 XML 文档的格式是否正确。我们被要求在将文件推送到实时站点之前检查文档以捕获 Velocity 语法错误。
是否有从命令行验证 Velocity 模板正确性的标准方法？
我准备读取模板路径，初始化 Velocity Engine，解析模板，并捕获本页所示的任何错误，但是如果有一个现成的工具可以获取文件和配置，并吐出任何错误，那我宁愿用那个。
更新
这就是我最终做的事情：
package velocitysample;
import java.io.IOException;
import java.io.StringWriter;
import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;
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;
public class Main
{
/** Define a static logger variable so that it references the Logger
* instance named "MyApp".
*/
private static Logger logger = Logger.getLogger(Main.class);
/**
* @param args the command line arguments
*/
public static void main(String[] args)
{
/* Set up a simple log4j configuration that logs on the console. */
BasicConfigurator.configure();
/* Check to see that a template path was passed on the command line. */
if (args.length != 1)
{
logger.fatal("You must pass the path to a template as a " +
"command line argument.");
return;
}
/* Pull the template filename from the command line argument. */
String fileName = args[0];
try
{
Velocity.setProperty("resource.loader", "file");
Velocity.setProperty("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.FileResourceLoader");
Velocity.setProperty("file.resource.loader.path", "/templates/");
Velocity.setProperty("file.resource.loader.cache", "false");
Velocity.setProperty("file.resource.loader.modificationCheckInterval", "0");
Velocity.init();
}
catch (Exception ex)
{
logger.fatal("Error initializing the Veolcity engine.", ex);
return;
}
boolean error = false;
/* Create an empty Velocity context */
VelocityContext context = new VelocityContext();
Template template = null;
try
{
template = Velocity.getTemplate(fileName);
}
catch( ResourceNotFoundException rnfe )
{
logger.error("Couldn't find the template to parse at this path: " +
fileName + ".", rnfe);
error = true;
}
catch( ParseErrorException peex )
{
logger.error("Error parsing the template located at this path: " +
fileName + ".", peex);
error = true;
}
catch( MethodInvocationException mie )
{
logger.error("Something invoked in the template (" + fileName +
") threw an Exception while parsing.", mie);
error = true;
}
catch( Exception e )
{
logger.error("An unexpected exception was thrown when attempting " +
"to parse the template: " + fileName + ".", e);
error = true;
}
if (error)
{
return;
}
StringWriter sw = new StringWriter();
try
{
template.merge(context, sw);
}
catch (ResourceNotFoundException rnfe)
{
logger.error("Couldn't find the template to merge at this path: " +
fileName + ".", rnfe);
error = true;
}
catch (ParseErrorException peex)
{
logger.error("Error parsing the template at this path during merge: " +
fileName + ".", peex);
error = true;
}
catch (MethodInvocationException mie)
{
logger.error("Something invoked in the template (" + fileName +
") threw an Exception while merging.", mie);
error = true;
}
catch (IOException ioe)
{
logger.error("Error reading the template located at this path from " +
"disk: " + fileName + ".", ioe);
error = true;
}
catch( Exception e )
{
logger.error("An unexpected exception was thrown when attempting " +
"to merge the template: " + fileName + ".", e);
error = true;
}
if (!error)
{
logger.info("No syntax errors detected.");
}
}
}