velocity 模板加载

一、velocity默认的加载方式(文件加载方式)

package com.velocity.test;

import java.io.StringWriter;

import java.util.Properties;

import org.apache.velocity.VelocityContext;

import org.apache.velocity.app.VelocityEngine;

/**

 * 从文件中加载模板文件,即velocity默认的模板文件加载方式

 * @author welcome

 *

 */

public class LoaderFromFile {

    

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

        //初始化参数

        Properties properties=new Properties();

        //设置velocity资源加载方式为file

        properties.setProperty("resource.loader", "file");

        //设置velocity资源加载方式为file时的处理类

        properties.setProperty("file.resource.loader.class", "org.apache.velocity.runtime.resource.loader.FileResourceLoader");

        //实例化一个VelocityEngine对象

        VelocityEngine velocityEngine=new VelocityEngine(properties);

        

        //实例化一个VelocityContext

        VelocityContext context=new VelocityContext();

        //向VelocityContext中放入键值

        context.put("username", "张三");

        context.put("password", "123456789");

        context.put("age", "20");

        context.put("address", "陕西西安"); 

        context.put("blog", "http://blogjava.net/sxyx2008");

        //实例化一个StringWriter

        StringWriter writer=new StringWriter();

        //从vm目录下加载hello.vm模板,在eclipse工程中该vm目录与src目录平级

        velocityEngine.mergeTemplate("vm/hello.vm", "gbk", context, writer);

        System.out.println(writer.toString());

    }

}

二、从类路径加载模板文件

package com.velocity.test;

import java.io.StringWriter;

import java.util.Properties;

import org.apache.velocity.VelocityContext;

import org.apache.velocity.app.VelocityEngine;

/**

 * 从class(类路径)中加载模板文件

 * @author welcome

 *

 */

public class LoaderFromClass {

    

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

        //初始化参数

        Properties properties=new Properties();

        //设置velocity资源加载方式为class

        properties.setProperty("resource.loader", "class");

        //设置velocity资源加载方式为file时的处理类

        properties.setProperty("class.resource.loader.class", "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");

        //实例化一个VelocityEngine对象

        VelocityEngine velocityEngine=new VelocityEngine(properties);

        

        //实例化一个VelocityContext

        VelocityContext context=new VelocityContext();

        //向VelocityContext中放入键值

        context.put("username", "张三");

        context.put("password", "123456789");

        context.put("age", "20");

        context.put("address", "陕西西安"); 

        context.put("blog", "http://blogjava.net/sxyx2008");

        //实例化一个StringWriter

        StringWriter writer=new StringWriter();

        

        //从src目录下加载hello.vm模板

        //假若在com.velocity.test包下有一个hello.vm文件,那么加载路径为com/velocity/test/hello.vm

        velocityEngine.mergeTemplate("com/velocity/test/hello.vm", "gbk", context, writer);

        

        //velocityEngine.mergeTemplate("hello.vm", "gbk", context, writer);

        System.out.println(writer.toString());

    }

}

三、从jar文件中加载模板文件

package com.velocity.test;

import java.io.StringWriter;

import java.util.Properties;

import org.apache.velocity.VelocityContext;

import org.apache.velocity.app.VelocityEngine;

/**

 * 从jar文件中加载模板文件

 * @author welcome

 *

 */

public class LoaderFromJar {

    

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

        //初始化参数

        Properties properties=new Properties();

        //设置velocity资源加载方式为jar

        properties.setProperty("resource.loader", "jar");

        //设置velocity资源加载方式为file时的处理类

        properties.setProperty("jar.resource.loader.class", "org.apache.velocity.runtime.resource.loader.JarResourceLoader");

        //设置jar包所在的位置

        properties.setProperty("jar.resource.loader.path", "jar:file:WebRoot/WEB-INF/lib/vm.jar");

        //实例化一个VelocityEngine对象

        VelocityEngine velocityEngine=new VelocityEngine(properties);

        

        //实例化一个VelocityContext

        VelocityContext context=new VelocityContext();

        //向VelocityContext中放入键值

        context.put("username", "张三");

        context.put("password", "123456789");

        context.put("age", "20");

        context.put("address", "陕西西安"); 

        context.put("blog", "http://blogjava.net/sxyx2008");

        //实例化一个StringWriter

        StringWriter writer=new StringWriter();

        //从/WebRoot/WEB-INF/lib/vm.jar中加载hello.vm模板  vm.jar的目录结构为vm/hello.vm

        velocityEngine.mergeTemplate("vm/hello.vm", "gbk", context, writer);

        System.out.println(writer.toString());

    }

}

温馨提示：转载至http://www.blogjava.net/sxyx2008/