velocity入门篇

velocity需要在lib下面导入4个文件包，如下面jpg图片所示:

velocity-1.7.zip的文件包在下面也给了下载地址

 

 

 

 

 

------------HelloVelocity .java--------------------

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Date;
import java.util.Hashtable;
import java.util.List;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.VelocityEngine;

public class HelloVelocity {

 public static void main(String[] args) throws Exception {
 
  //初始化并取得Velocity引擎  
  VelocityEngine ve = new VelocityEngine(); 
  ve.init();
  //取得velocity的模版 
  Template t = ve.getTemplate("src/hellovelocity.vm");  //在src路劲下面放着的时间
  //取得velocity的上下文context  
  VelocityContext context = new VelocityContext();  
  //把数据填入上下文  
  context.put("name","Liang"); 
  context.put("bing","lujiebing");
  context.put("date", (new Date()).toString());
  
  
  //为后面的展示，提前输入List数值 
  List temp = new ArrayList(); 
  temp.add("1"); 
  temp.add("2"); 
  context.put("list", temp);
  
  //hashtable
  Hashtable table=new Hashtable();
  table.put("a", 1);
  table.put("b", 1);
  table.put("c", 1);
  context.put("table", table);
  
  //javabean
  context.put("person",new PersonBean("xuli","1234"));
  
  
  
  //输出流  
  StringWriter writer = new StringWriter();  
  //转换输出  
  t.merge(context, writer);
  System.out.println(writer.toString());
 }
}

 

 

---------helloVelocity.vm---------------------

 

Welcome $name to Javayou.com!

today is $date.
#set($bing = "lujie")
welcome $bing to see you!

 

#foreach( $product in $list )
 <$velocityCount>  $product
#end

#foreach( $key in $table.keySet() )
$key  value: $table.get($key)
#end

 

 Address: $person.name