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11682314
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2012-07-27T06:05:58.237
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2012-07-27T06:05:58.237
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i see 3 ways: filter, basic servlet(all requests via main servlet) or "servlet-mapping" filter This example rewrite url <pre>http://example.org/<int value></pre> to <pre>http://example.org/user?id=<int value></pre> i.e <pre>http://example.org/1234 -> http://example.org/user?id=1234</pre> <ol> <li>determinate filter in web.xml</li> </ol> <blockquote> <pre><code><filter> <filter-name>Router</filter-name> <filter-class>org.example.Router</filter-class> <init-param> <param-name>param1</param-name> <param-value>valueOfparam1</param-value> </init-param> </filter> <filter-mapping> <filter-name>Router</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </code></pre> </blockquote> in init-param section you can specify route rules <ol> <li>filter class <pre><code>public class Router implements javax.servlet.Filter { private static final Pattern REWRITE_PATTERN = Pattern.compile("(^[1-9]\\d*)$"); @Override public void destroy() { } @Override public void doFilter(ServletRequest req, ServletResponse res, FilterChain fc) throws IOException, ServletException { //this method calling before controller(servlet), every request HttpServletRequest request = (HttpServletRequest) req; String url = request.getRequestURL().toString(); String number = url.substring(url.lastIndexOf("/")).replace("/", ""); Matcher m = REWRITE_PATTERN.matcher(number); if(m.find()) { RequestDispatcher dispatcher = request.getRequestDispatcher("user?id=" + m.group(1)); dispatcher.forward(req, res); } else { fc.doFilter(req, res); } } @Override public void init(FilterConfig fc) throws ServletException { //here you may read params from web.xml }} </code></pre></li> </ol> basic sevlet <pre><code>public class BasicServlet extends HttpServlet { //route rules here, and rewrite } </code></pre> servlet-mapping <pre><code><servlet-mapping> <servlet-name>UserServlet</servlet-name> <uri-mapping>/user/*</uri-mapping> </servlet-mapping> <servlet-mapping> <servlet-name>PostServlet</servlet-name> <uri-mapping>/post/*</uri-mapping> </servlet-mapping> </code></pre> <ul> <li>filter - more flexible and not require serious modify working code</li> <li>basic servlet - flexible, require change you code</li> <li>servlet mapping - simply, not flexible(for specific route rules)</li> </ul>
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