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    <p>The GZIP filter that I use to compress resources in my webapps:</p> <pre class="lang-java prettyprint-override"><code>public class CompressionFilter implements Filter { public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest httpRequest = (HttpServletRequest) request; HttpServletResponse httpResponse = (HttpServletResponse) response; String acceptEncoding = httpRequest.getHeader(HttpHeaders.ACCEPT_ENCODING); if (acceptEncoding != null) { if (acceptEncoding.indexOf("gzip") &gt;= 0) { GZIPHttpServletResponseWrapper gzipResponse = new GZIPHttpServletResponseWrapper(httpResponse); chain.doFilter(request, gzipResponse); gzipResponse.finish(); return; } } chain.doFilter(request, response); } public void init(FilterConfig filterConfig) throws ServletException { } } public class GZIPHttpServletResponseWrapper extends HttpServletResponseWrapper { private ServletResponseGZIPOutputStream gzipStream; private ServletOutputStream outputStream; private PrintWriter printWriter; public GZIPHttpServletResponseWrapper(HttpServletResponse response) throws IOException { super(response); response.addHeader(HttpHeaders.CONTENT_ENCODING, "gzip"); } public void finish() throws IOException { if (printWriter != null) { printWriter.close(); } if (outputStream != null) { outputStream.close(); } if (gzipStream != null) { gzipStream.close(); } } @Override public void flushBuffer() throws IOException { if (printWriter != null) { printWriter.flush(); } if (outputStream != null) { outputStream.flush(); } super.flushBuffer(); } @Override public ServletOutputStream getOutputStream() throws IOException { if (printWriter != null) { throw new IllegalStateException("printWriter already defined"); } if (outputStream == null) { initGzip(); outputStream = gzipStream; } return outputStream; } @Override public PrintWriter getWriter() throws IOException { if (outputStream != null) { throw new IllegalStateException("printWriter already defined"); } if (printWriter == null) { initGzip(); printWriter = new PrintWriter(new OutputStreamWriter(gzipStream, getResponse().getCharacterEncoding())); } return printWriter; } @Override public void setContentLength(int len) { } private void initGzip() throws IOException { gzipStream = new ServletResponseGZIPOutputStream(getResponse().getOutputStream()); } } public class ServletResponseGZIPOutputStream extends ServletOutputStream { GZIPOutputStream gzipStream; final AtomicBoolean open = new AtomicBoolean(true); OutputStream output; public ServletResponseGZIPOutputStream(OutputStream output) throws IOException { this.output = output; gzipStream = new GZIPOutputStream(output); } @Override public void close() throws IOException { if (open.compareAndSet(true, false)) { gzipStream.close(); } } @Override public void flush() throws IOException { gzipStream.flush(); } @Override public void write(byte[] b) throws IOException { write(b, 0, b.length); } @Override public void write(byte[] b, int off, int len) throws IOException { if (!open.get()) { throw new IOException("Stream closed!"); } gzipStream.write(b, off, len); } @Override public void write(int b) throws IOException { if (!open.get()) { throw new IOException("Stream closed!"); } gzipStream.write(b); } } </code></pre> <p>You also need to define the mapping in your web.xml:</p> <pre class="lang-xml prettyprint-override"><code>&lt;filter&gt; &lt;filter-name&gt;CompressionFilter&lt;/filter-name&gt; &lt;filter-class&gt;com.my.company.CompressionFilter&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;CompressionFilter&lt;/filter-name&gt; &lt;url-pattern&gt;*.js&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;CompressionFilter&lt;/filter-name&gt; &lt;url-pattern&gt;*.css&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;CompressionFilter&lt;/filter-name&gt; &lt;url-pattern&gt;*.html&lt;/url-pattern&gt; &lt;/filter-mapping&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;CompressionFilter&lt;/filter-name&gt; &lt;url-pattern&gt;*.jsp&lt;/url-pattern&gt; &lt;/filter-mapping&gt; </code></pre>
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    1. POWhich compression (is GZIP the most popular) servlet filter would you suggest?
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    1. USGerman Attanasio
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    1. COThe formatting of this code is not perfect, but it actually works for me, without any dependency. Thanks a bunch!
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      1. USelectrotype
    2. COThank you for providing full implementations for all the classes, I prefer this small solution to importing a whole new dependency (which comes with a bunch of dependencies of its own). Question, why do map to js/css/html/jsp specifically, what types of streams would you not want to compress?
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    3. COImages, executable files or any other file type that will not take advantages of compression.
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      1. USGerman Attanasio
 

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