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Velocity引擎翻译HTML模板的两种写法

2017-05-15 17:57 357 查看

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());
}
}

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