velocity示例

创建maven项目

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.java3</groupId>
    <artifactId>java3</artifactId>
    <version>1.0-SNAPSHOT</version>
    <dependencies>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>2.0.0-alpha1</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>2.0.0-alpha1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.2</version>
        </dependency>

    </dependencies>

</project>

Java类

package vm;

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

public class HelloWord {
    public static void main(String[] args){
        VelocityEngine ve = new VelocityEngine();
        ve.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
        ve.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());
        ve.init();
        // 获取模板文件
        Template t = ve.getTemplate("hellovelocity.vm");
        // 设置变量
        VelocityContext ctx = new VelocityContext();
        ctx.put("name", "Velocity");
        List list = new ArrayList();
        list.add("1");
        list.add("2");
        ctx.put("list", list);
        // 输出
        StringWriter sw = new StringWriter();
        t.merge(ctx,sw);
        System.out.println(sw.toString());
    }
}

vm

#set($greet = 'hello')
$greet $name
#foreach($i in $list)
    $i
#end

运行类即可。

velocity也可以通过手工下载，添加jar到项目里运行，

velocity最新jar包下载地址

http://velocity.apache.org/download.cgi