Velocity 源码例子

package com.meijia.db; import java.io.FileInputStream; import java.io.IOException; import java.io.FileNotFoundException; import java.util.Properties; import java.util.Vector; import javax.servlet.ServletConfig; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.velocity.Template; import org.apache.velocity.context.Context; import org.apache.velocity.servlet.VelocityServlet; import org.apache.velocity.app.Velocity; import org.apache.velocity.exception.ResourceNotFoundException; import org.apache.velocity.exception.ParseErrorException; public class SampleServlet extends VelocityServlet { protected Properties loadConfiguration(ServletConfig config)throws IOException, FileNotFoundException{ /* * 得到属性配置文件并load它 */ String propsFile = config.getInitParameter(INIT_PROPS_KEY); Properties p = new Properties(); if (propsFile != null){ String realPath = getServletContext().getRealPath(propsFile); if (realPath != null){ propsFile = realPath; } p.load(new FileInputStream(propsFile)); } /* * 设置velocity日志文件在web应用中的位置 */ String log = p.getProperty(Velocity.RUNTIME_LOG); if (log != null){ log = getServletContext().getRealPath(log); if (log != null) { p.setProperty(Velocity.RUNTIME_LOG, log); } } /* * 设置模板文件在web应用中的位置 */ String path = p.getProperty(Velocity.FILE_RESOURCE_LOADER_PATH); if (path != null){ path = getServletContext().getRealPath(path); if (path != null){ p.setProperty(Velocity.FILE_RESOURCE_LOADER_PATH, path); } } return p; } public Template handleRequest(HttpServletRequest request,HttpServletResponse response,Context ctx){ String p1 = "Bob"; String p2 = "Harold"; Vector personList = new Vector(); personList.addElement(p1); personList.addElement(p2); /* * 将模板数据 list 放置到上下文环境 context 中去 */ ctx.put("theList", personList); /* * 获取模板对象，有三种可能产生的异常 */ Template outty = null; try{ outty = getTemplate("sample.vm"); } catch (ParseErrorException pee){ System.out.println( "SampleServlet : parse error for template " + pee); }catch (ResourceNotFoundException rnfe){ System.out.println("SampleServlet : template not found " + rnfe); }catch (Exception e){ System.out.println("Error " + e); } return outty; } }