velocity模板引擎学习(4)-在standalone的java application中使用velocity及velocity-tools

通常velocity是配合spring mvc之类的框架在web中使用,但velocity本身其实对运行环境没有过多的限制,在单独的java application中也可以独立使用,下面演示了利用velocity模板引擎生成 『每日发货单』邮件内容:

一、先定义邮件内容模板:mail-template.vm

<string>用户,您好:</string>
<h2>以下是 $date.format('yyyy-MM-dd',$model.deliverDate,$convert.toLocale("en_US")) 的发货清单,请核对!</h2>
<ul>
#foreach ($item in $model.items)
<li>$velocityCount . $item.productName / $item.productNum 件</li>
#end
</ul>

这里面涉及到二个java类:Order(发货订单)及OrderItem(订单明细)

import java.util.Date;
import java.util.List; public class Order { private Date deliverDate; private List<OrderItem> items; public Date getDeliverDate() {
return deliverDate;
} public void setDeliverDate(Date deliverDate) {
this.deliverDate = deliverDate;
} public List<OrderItem> getItems() {
return items;
} public void setItems(List<OrderItem> items) {
this.items = items;
}
}

public class OrderItem {

    private String productName;
private int productNum; public String getProductName() {
return productName;
} public void setProductName(String productName) {
this.productName = productName;
} public int getProductNum() {
return productNum;
} public void setProductNum(int productNum) {
this.productNum = productNum;
}
}

二、使用示例

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;
import org.apache.velocity.runtime.RuntimeConstants;
import org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader;
import org.apache.velocity.tools.generic.ConversionTool;
import org.apache.velocity.tools.generic.DateTool;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Date; public class VelocityTest { public static void main(String[] args) { VelocityEngine ve = new VelocityEngine();
//定义vm资源加载的路径为classpath所在目录
ve.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
ve.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName()); ve.init(); //加载模板
Template t = ve.getTemplate("mail-template.vm", "utf-8");
VelocityContext ctx = new VelocityContext(); //加载velocity-tools
ctx.put("date", new DateTool());
ctx.put("convert", new ConversionTool()); //放入要绑定的对象
ctx.put("model", getOrder()); StringWriter sw = new StringWriter(); t.merge(ctx, sw); //输出
System.out.println(sw.toString());
} private static Order getOrder() { Order o = new Order();
o.setDeliverDate(new Date());
o.setItems(new ArrayList<OrderItem>()); OrderItem item1 = new OrderItem();
item1.setProductName("iphone");
item1.setProductNum(1); OrderItem item2 = new OrderItem();
item2.setProductName("mac pro");
item2.setProductNum(2); o.getItems().add(item1);
o.getItems().add(item2); return o;
}
}

运行的输出结果:

<string>用户 您好:</string>
<h2>以下是 2015-09-12 的发货清单,请核对!</h2>
<ul>
<li>1 . iphone / 1 件</li>
<li>2 . mac pro / 2 件</li>
</ul>

参考文章:

http://www.ibm.com/developerworks/cn/java/j-lo-velocity1/index.html

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