應用程序中非view层访问Velocity應用

在发送郵件时使用在业务层访问

package com.unutrip.template.util;

import java.io.StringWriter;
import java.io.Writer;
import java.util.Map;
import java.util.Properties;

import org.apache.log4j.Logger;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.exception.VelocityException;

/**
 * Velocity 模板 使用的工具类
 *
 * @author longgangbai
 *
 */
public class VelocityUtils {
 private static final Logger logger = Logger.getLogger(VelocityUtils.class);

 private static VelocityEngine velocityEngine = new VelocityEngine();
 static {
  Properties p = new Properties();
  p.setProperty("file.resource.loader.path", VelocityUtils.class
    .getResource("/velocity/").getFile());
  System.out.println("path"
    + VelocityUtils.class.getResource("/velocity/").getFile());
  try {
   velocityEngine.init(p);
   /*
    * velocityEngine.setProperty("input.encoding", "UTF-8");
    * velocityEngine.setProperty("out.stream", "UTF-8");
    * velocityEngine.setProperty("resource.loader", "class");
    * velocityEngine .setProperty("class.resource.loader.class",
    * "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
    */

  } catch (Exception e) {
   logger.error("loader velocity is error!");
   e.printStackTrace();
  }

 }

 public VelocityUtils() {
 }

 /**
  *
  * @param templateLocation
  * @param model
  * @param writer
  * @throws VelocityException
  */
 public static void mergeTemplate(String templateLocation, Map model,
   Writer writer) throws VelocityException {
  try {
   VelocityContext velocityContext = new VelocityContext(model);
   velocityEngine.mergeTemplate(templateLocation, velocityContext,
     writer);
  } catch (Exception ex) {
   logger
     .error(
       "Why does VelocityEngine throw a generic checked exception, after all?",
       ex);
   throw new VelocityException(ex.toString());
  }
 }

 /**
  *
  * @param velocityEngine
  *            模板引擎
  * @param templateLocation
  *            模板的名稱
  * @param encoding
  *            設置的編碼格式
  * @param model
  *            模板對應的模型的對象
  * @param writer
  *            輸出對象
  * @throws VelocityException
  *             拋出异常的信息
  */
 private static void mergeTemplate(VelocityEngine velocityEngine,
   String templateLocation, String encoding, Map model, Writer writer)
   throws VelocityException {
  try {
   VelocityContext velocityContext = new VelocityContext(model);
   velocityEngine.mergeTemplate(templateLocation, encoding,
     velocityContext, writer);
  } catch (Exception ex) {
   logger
     .error(
       "Why does VelocityEngine throw a generic checked exception, after all?",
       ex);
   throw new VelocityException(ex.toString());
  }
 }

 /**
  * 常用的提供模板內容的字符串信息（常用的方法的）
  *
  * @param templateLocation
  * @param model
  * @return
  * @throws VelocityException
  */
 public static String mergeTemplateIntoString(String templateLocation,
   Map model) throws VelocityException {
  StringWriter result = new StringWriter();
  mergeTemplate(velocityEngine, templateLocation, "UTF-8", model, result);
  return result.toString();
 }

 /**
  *
  * @param velocityEngine
  * @param templateLocation
  * @param encoding
  * @param model
  * @return
  * @throws VelocityException
  */
 public static String mergeTemplateIntoString(VelocityEngine velocityEngine,
   String templateLocation, String encoding, Map model)
   throws VelocityException {
  StringWriter result = new StringWriter();
  mergeTemplate(velocityEngine, templateLocation, encoding, model, result);
  return result.toString();
 }
}

 

测试代码:

package com.unutrip.template.model;

import java.util.Date;

/**
 * 测试的一个定点的對象
 *
 * @author longgangbai
 *
 */
public class Order {
 // 客户
 public String customerName;
 // 订单编号
 public String orderNo;
 // 酒店的名稱
 public String hotelName;
 // 房型编号
 public String roomName;
 // 入住時間
 public Date checkindate;

 public String getOrderNo() {
  return orderNo;
 }

 public void setOrderNo(String orderNo) {
  this.orderNo = orderNo;
 }

 public String getHotelName() {
  return hotelName;
 }

 public void setHotelName(String hotelName) {
  this.hotelName = hotelName;
 }

 public String getRoomName() {
  return roomName;
 }

 public void setRoomName(String roomName) {
  this.roomName = roomName;
 }

 public Date getCheckindate() {
  return checkindate;
 }

 public void setCheckindate(Date checkindate) {
  this.checkindate = checkindate;
 }

 public String getCustomerName() {
  return customerName;
 }

 public void setCustomerName(String customerName) {
  this.customerName = customerName;
 }

}

测试类:

package com.unutrip.template.test;

import java.util.ArrayList;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.lang.time.DateUtils;

import com.unutrip.template.model.Order;
import com.unutrip.template.util.VelocityUtils;

public class VelocityTest {
 public static void main(String[] args) throws Exception {
  String veloctiytmp = "email.vm";
  Map model = new HashMap();

  // 一般的對象
  Order order = new Order();
  order.setCustomerName("wuxc");
  order.setHotelName("汉庭酒家");
  order.setOrderNo("00009");
  order.setRoomName("4567");
  order.setCheckindate(new Date());
  model.put("order", order);

  // 集合對象
  List<Order> orders = new ArrayList<Order>();
  for (int i = 1; i < 6; i++) {
   Order order0 = new Order();
   order0.setCheckindate(DateUtils.add(new Date(),
     Calendar.DAY_OF_MONTH, i));
   order0.setCustomerName("customerName--" + i);
   order0.setHotelName("如家大酒店");
   order0.setOrderNo("001");
   order0.setRoomName("200" + i);
   orders.add(order0);
  }
  model.put("members", orders);

  // 存放Map
  Map membersMap = new HashMap();
  membersMap.put("key", order);
  model.put("membersMap", membersMap);
  System.out.println("From Veclotity ="
    + VelocityUtils.mergeTemplateIntoString(veloctiytmp, model));

 }
}

veclocity的模板文件如下:

编译一个集合和一个Map對象應用

 

<html>
  <body>
     List:
     #foreach($member in $members)
       <li>$member.customerName - $member.orderNo $member.hotelName $member.checkindate??string('yyyy-MM-dd ') </li>
     #end 
    
     <br>
     Map:
     #foreach($member in $membersMap.entrySet())
       <li>$member.key - $member.value.customerName  $member.value.hotelName  $member.value.roomName</li>
     #end
  </body>
</html>

 

Velocity的一个问题:关于時間数字类型必须使用Java代码格式化显示.