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POHow to use a servlet filter in Java to change an incoming servlet request url?
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  1. POHow to use a servlet filter in Java to change an incoming servlet request url?
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    copied!<p>How can I use a servlet filter to change an incoming servlet request url from</p> <p><code>http://nm-java.appspot.com/Check_License/Dir_My_App/Dir_ABC/My_Obj_123</code></p> <p>to</p> <p><code>http://nm-java.appspot.com/Check_License?Contact_Id=My_Obj_123</code></p> <p>?</p> <hr> <p><strong>Update</strong>: according to BalusC's steps below, I came up with the following code:</p> <pre><code>public class UrlRewriteFilter implements Filter { @Override public void init(FilterConfig config) throws ServletException { // } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws ServletException, IOException { HttpServletRequest request = (HttpServletRequest) req; String requestURI = request.getRequestURI(); if (requestURI.startsWith("/Check_License/Dir_My_App/")) { String toReplace = requestURI.substring(requestURI.indexOf("/Dir_My_App"), requestURI.lastIndexOf("/") + 1); String newURI = requestURI.replace(toReplace, "?Contact_Id="); req.getRequestDispatcher(newURI).forward(req, res); } else { chain.doFilter(req, res); } } @Override public void destroy() { // } } </code></pre> <p>The relevant entry in <code>web.xml</code> look like this:</p> <pre class="lang-xml prettyprint-override"><code>&lt;filter&gt; &lt;filter-name&gt;urlRewriteFilter&lt;/filter-name&gt; &lt;filter-class&gt;com.example.UrlRewriteFilter&lt;/filter-class&gt; &lt;/filter&gt; &lt;filter-mapping&gt; &lt;filter-name&gt;urlRewriteFilter&lt;/filter-name&gt; &lt;url-pattern&gt;/*&lt;/url-pattern&gt; &lt;/filter-mapping&gt; </code></pre> <p>I tried both server-side and client-side redirect with the expected results. It worked, thanks BalusC!</p>
 

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