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| 缓存类路径资源装载机 |
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import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.collections.ExtendedProperties;
import org.apache.velocity.exception.ResourceNotFoundException;
import org.apache.velocity.runtime.resource.Resource;
import org.apache.velocity.runtime.resource.loader.ResourceLoader;
public class CachingClasspathResourceLoader extends ResourceLoader {
private Map urlMap = new HashMap();
public void init(ExtendedProperties configuration) {
}
public synchronized InputStream getResourceStream(String resourceName)
throws ResourceNotFoundException {
try {
URL url = getURL(resourceName);
if (url == null) {
throw new ResourceNotFoundException("Can not find resource: "
+ resourceName);
}
return url.openStream();
} catch (IOException e) {
throw new ResourceNotFoundException("Can not find resource: "
+ resourceName + " - Reason: " + e.getMessage());
}
}
public long getLastModified(Resource res) {
try {
URL url = getURL(res.getName());
long lm = url.openConnection().getLastModified();
return lm;
} catch (Exception e) {
rsvc.error(e);
return 0;
}
}
public boolean isSourceModified(Resource res) {
long lastModified = getLastModified(res);
return (lastModified != res.getLastModified());
}
private URL getURL(String rn) {
if (urlMap.containsKey(rn)) {
return (URL) urlMap.get(rn);
}
ClassLoader cl = this.getClass().getClassLoader();
URL url = cl.getResource(rn);
if (url != null) {
urlMap.put(rn, url);
}
return url;
}
}
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 velocity-CachingClasspathResourceLoader.zip( 2,193 k) |
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