Velocity引擎翻译HTML模板的两种写法

最新推荐文章于 2021-08-10 15:18:36 发布

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本文介绍如何使用Apache Velocity模板引擎来动态生成HTML内容。通过两个示例演示了如何将数据模型与模板结合，生成完整的HTML页面。

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第一种写法新建一个HTML文件，内容为：

<html> 
<title>Hello Velocity</title> 
<body> 
Welcome  $name  to Javayou.com! 
today is  $date. 
</body>
</html>

然后通过Java代码读取HTML文件，并解析参数，输出结果

第二种写法，使用场景多为HTML页面内容存在数据库，通过SQL获取后为String格式，然后解析

Java代码如下：

import java.io.StringWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;

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

public class HelloWorld {

	public static void main(String args[]){
		/**
		 * name  to Javayou.com! 
		 *today is  $date.
		 */
		
		Map map = new HashMap();
		map.put("name", "sdmjhca");
		map.put("date", (new Date()).toString());
		new HelloWorld().replaceByVelocity(map);
		StringBuffer temp = new StringBuffer();
		temp.append("<html>\n ");
		temp.append("<title>Hello Velocity</title>\n   ");
		temp.append("<body>\n  ");
		temp.append("Welcome  $name  to Javayou.com! \n  ");
		temp.append("today is  $date.\n  ");
		temp.append("</body> \n ");
		temp.append("</html> \n ");
		new HelloWorld().replaceByVelocity(map,temp.toString());
	}
	public void replaceByVelocity(Map map){
		VelocityEngine vi = new VelocityEngine();
		vi.init();
		Template template = vi.getTemplate("heloWorld.html", "UTF-8");
		VelocityContext vc = new VelocityContext();
		Iterator iter = map.entrySet().iterator();
		while(iter.hasNext()){
			Map.Entry entry = (Entry) iter.next();
			String key = entry.getKey().toString();
			String value = entry.getValue().toString();
			vc.put(key, value);
		}
		StringWriter writer = new StringWriter();
		//System.out.println("---------"+template.getData().toString());
		template.merge(vc, writer);
		System.out.println(writer.toString());
	}
	public void replaceByVelocity(Map map,String template){
		VelocityEngine vi = new VelocityEngine();
		vi.init();
		
		VelocityContext vc = new VelocityContext();
		Iterator iter = map.entrySet().iterator();
		while(iter.hasNext()){
			Map.Entry entry = (Entry) iter.next();
			String key = entry.getKey().toString();
			String value = entry.getValue().toString();
			vc.put(key, value);
		}
		StringWriter writer = new StringWriter();
		vi.evaluate(vc, writer, "", template);
		//writer.write(s);
		//template.merge(vc, writer);
		//System.out.println(writer.toString());
	}
}