net.anotheria.anosite.content.servlet.resource.ResourceServletUtils Maven / Gradle / Ivy
package net.anotheria.anosite.content.servlet.resource;
import net.anotheria.util.IOUtils;
import net.anotheria.util.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* Support utilities for ResourceServlet.
*
* @author h3ll
*/
final class ResourceServletUtils {
/**
* {@link Logger} instance.
*/
private static final Logger LOG = LoggerFactory.getLogger(ResourceServletUtils.class);
/**
* Header LAST_MODIFIED.
*/
private static final String LAST_MODIFIED_HEADER = "Last-Modified";
/**
* Mime types map.
*/
private static Map extensionMapping;
/**
* Extension init.
*/
static {
extensionMapping = new HashMap();
extensionMapping.put("pdf", "application/pdf");
extensionMapping.put("jpe", "image/jpeg");
extensionMapping.put("jpeg", "image/jpeg");
extensionMapping.put("jpg", "image/jpeg");
extensionMapping.put("png", "image/png");
extensionMapping.put("js", "text/javascript");
extensionMapping.put("exe", "application/octet-stream");
extensionMapping.put("gif", "image/gif");
extensionMapping.put("gz", "application/x-gzip");
extensionMapping.put("zip", "application/zip");
extensionMapping.put("doc", "application/msword");
extensionMapping.put("dot", "application/msword");
extensionMapping.put("pot", "application/vnd.ms-powerpoint");
extensionMapping.put("ppt", "application/vnd.ms-powerpoint");
extensionMapping.put("pps", "application/vnd.ms-powerpoint");
}
/**
* Splits the REST-like path of the request URI into tokens.
*
* @param request {@link javax.servlet.http.HttpServletRequest}
* @return parameter string splitted
*/
protected static String[] parsePathParameters(HttpServletRequest request) {
return request.getPathInfo().substring(1).split("/");
}
/**
* Streams some file to the response.
*
* @param response {@link javax.servlet.http.HttpServletResponse}
* @param file {@link java.io.File} to stream
* @throws java.io.IOException on IO errors
*/
protected static void streamFile(HttpServletResponse response, File file) throws IOException {
response.setContentType(guessMimeType(file.getName()));
response.setContentLength((int) file.length());
response.setHeader(LAST_MODIFIED_HEADER, new Date(file.lastModified()).toGMTString());
InputStream in = null;
try {
in = new FileInputStream(file);
org.apache.commons.io.IOUtils.copyLarge(in, response.getOutputStream());
} catch (IOException e) {
LOG.error("streamFile[response, " + file + "] failed", e);
throw e;
} finally {
IOUtils.closeIgnoringException(in);
}
}
/**
* Returns mime type - according to file extension.
*
* @param fName name of file
* @return mime type if available
*/
private static String guessMimeType(String fName) {
if (!StringUtils.isEmpty(fName)) {
String extension = fName.contains(".") && fName.lastIndexOf(".") != fName.length() - 1 ? fName.substring(fName.lastIndexOf('.') + 1) : null;
if (extension != null)
return extensionMapping.get(extension);
}
return null;
}
private ResourceServletUtils() {
throw new IllegalAccessError("Can't be instantiated");
}
}