velocity 入门实例

1 java文件

package com.test;
import java.io.StringWriter; 
import java.util.*;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine; 
import org.apache.velocity.Template; 
import org.apache.velocity.VelocityContext; 

public class VelTest {
	
	public static void main(String[] args) throws Exception { 

		//初始化并取得Velocity引擎 
		VelocityEngine ve = new VelocityEngine(); 
		
		//Properties p =new Properties();
    	//p.put("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
		//ve.init(p); 
		
		
		//ve.setProperty(Velocity.RESOURCE_LOADER, "class");
		//ve.setProperty("class.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");   
		//ve.init();
		
		Properties p =new Properties();
		p.put(Velocity.FILE_RESOURCE_LOADER_PATH, "D:/workspace/velocity/src/");
		ve.init(p);
		
		//取得velocity的模版 

		Template t = ve.getTemplate("com/test/example2.vm","gbk"); 
		
		//取得velocity的上下文context 
		VelocityContext context = new VelocityContext(); 

		//把数据填入上下文 
		context.put("name", "zhaozhi3758"); 
	
		//为后面的展示，提前输入List数值 也可以解析pojo
		List temp = new ArrayList(); 
		temp.add("1"); 
		temp.add("2"); 
		context.put("list", temp); 

		Map velMap =new HashMap();
		velMap.put("key1", "极品家丁");
		velMap.put("key2", "斗破苍穹");
		context.put("map", velMap); 
		
		List lmList = new ArrayList();
		Map l1Map =new HashMap();
		l1Map.put("list1", "listValue1");
		l1Map.put("list11", "listValue11");
		lmList.add(l1Map);
		
		Map l2Map =new HashMap();
		l1Map.put("list2", "listValue2");
		l1Map.put("list22", "listValue22");
		lmList.add(l2Map);
		context.put("listmap", lmList);
		
		
		
		
		//输出流 
		StringWriter writer = new StringWriter(); 

		//转换输出 
		t.merge(context, writer); 
		System.out.println(writer.toString()); 

		}

	

}

2 模板文件

#parse("/com/test/example1.vm")
//--------------直接设值----------------
#set($condition = true)
#if ($condition)
 条件 is true!
#else
 条件 is false!
#end

//--------------context 中设值----------
 欢迎来自$name$project的工程！

//------------遍历list------------------
#foreach($name in $list )
 $name
#end

//------------遍历map------------------

#foreach($param in $map.keySet())   
  key:$param --> value: $map.get($param)
#end

//------------遍历list<map>------------------
#set ($i=0)
#foreach($lmap in $listmap)
 #foreach($inMap in $lmap.keySet())
key:$inMap --> value: $lmap.get($inMap)
 #end
   #set($i=$i+1)
#end