velocity中模版不用文件是否可行

Question

去看
org.apache.velocity.runtime.resource.loader.DataSourceResourceLoader
的API文档。

Answer 1

晕死了，APi文档里有DataSourceResourceLoader的详细介绍，居然jar包里没有....给个简单实现罢：package com.saro.custom.velocity;import org.apache.velocity.runtime.resource.loader.ResourceLoader;
import org.apache.velocity.runtime.resource.Resource;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.commons.collections.ExtendedProperties;import java.io.InputStream;
import java.io.ByteArrayInputStream;/**
 * User: Saro
 * Date: 2006-3-17
 * Time: 19:02:29
 */
public class StringResourceLoader extends ResourceLoader {    public void init( ExtendedProperties configuration){
    }    public synchronized InputStream getResourceStream( String templateString )
            throws ResourceNotFoundException{
        InputStream result = null;        if (templateString == null || templateString.length() == 0) {
            throw new ResourceNotFoundException ("No template string provided");
        }
        result=new ByteArrayInputStream(templateString.getBytes());
        return result;
    }    public boolean isSourceModified(Resource resource) {
        return false;
    }    public long getLastModified(Resource resource) {
        return 0;
    }
}然后，测试代码：
    public static void testVelocity() {
        try {
            //Velocity.init("WEB-INF/velocity.properties");
            Properties p=new Properties();
            p.put("input.encoding","UTF-8");
            p.put("output.encoding","UTF-8");
            p.put("resource.loader","srl");
            p.put("srl.resource.loader.class","com.saro.custom.velocity.StringResourceLoader");
            Velocity.init(p);
            VelocityContext context = new VelocityContext();            context.put("coolman", "Rodjohnson");
            BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("r.txt"),"UTF-8"));
            Template tt=Velocity.getTemplate("coolman is ${coolman}","UTF-8");
            tt.merge(context,writer);
            writer.flush();
            writer.close();
        } catch (Exception e) {
            e.printStackTrace();
        }    }