Mercurial > dive4elements > river
view flys-client/src/main/java/de/intevation/flys/client/server/ProxyServlet.java @ 4421:0b0f415203f0
Add new Filter class to change caching
Add new Filter class to avoid caching of GWT nocache files in browsers and http
proxies. The new Filter class NoCacheFilter sets http headers to stop the
proxies and browesers from storing the nocache files.
author | Björn Ricks <bjoern.ricks@intevation.de> |
---|---|
date | Tue, 06 Nov 2012 13:32:06 +0100 |
parents | 92239b53823f |
children |
line wrap: on
line source
package de.intevation.flys.client.server; import java.io.InputStream; import java.io.IOException; import java.io.OutputStream; import java.util.Enumeration; import javax.servlet.ServletConfig; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.apache.http.Header; import org.apache.http.HttpEntity; import org.apache.http.HttpResponse; import org.apache.http.StatusLine; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.DefaultHttpClient; import org.apache.log4j.Logger; import de.intevation.flys.client.server.auth.User; /** * Implements a Proxy for HTTP Requests */ public class ProxyServlet extends HttpServlet { private static Logger logger = Logger.getLogger(ProxyServlet.class); private String remoteurl; @Override public void init(ServletConfig config) { this.remoteurl = config.getInitParameter("remoteurl"); } @Override public void doPost(HttpServletRequest req, HttpServletResponse resp) { } @Override public void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException { HttpClient httpclient = new DefaultHttpClient(); String requesturi = req.getRequestURI(); String query = req.getQueryString(); HttpGet httpget = new HttpGet(this.remoteurl + "?" + query); boolean debug = logger.isDebugEnabled(); for (Enumeration e = req.getHeaderNames(); e.hasMoreElements();) { String name = (String)e.nextElement(); for (Enumeration f = req.getHeaders(name); f.hasMoreElements();) { String value = (String)f.nextElement(); if (debug) { logger.debug( "Adding request header " + name + " : " + value); } httpget.addHeader(name, value); } } HttpResponse response = httpclient.execute(httpget); StatusLine statusline = response.getStatusLine(); if (debug) { logger.debug("Response statuscode " + statusline.getStatusCode()); } resp.setStatus(statusline.getStatusCode()); Header[] headers = response.getAllHeaders(); for(Header header : headers) { if (debug) { logger.debug( "Adding response header " + header.getName() + " : " + header.getValue()); } resp.setHeader(header.getName(), header.getValue()); } HttpEntity entity = response.getEntity(); if (entity != null) { InputStream instream = entity.getContent(); byte [] buf = new byte[4096]; try { OutputStream outstream = resp.getOutputStream(); try { int read; while ((read = instream.read(buf)) >= 0) { outstream.write(buf, 0, read); } outstream.flush(); } finally { outstream.close(); } } finally { instream.close(); } } } private User getUser(HttpServletRequest req) { HttpSession session = req.getSession(); return (User)session.getAttribute("user"); } }