此代码是 oschina 到手柄形状像 http://www.oschina.net/p/tomcat 这种URL 

此类已经废弃，改用  

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[1].[代码] URLMappingServlet.java  

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package my.view;   import java.io.*; import java.util.*;   import javax.servlet.*; import javax.servlet.http.*;   import org.apache.commons.lang.StringUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory;   /**   * 用于URL地址的转换   * http://www.oschina.net/news/list/1/3 -> {base}/news/list.vm? p1=1&p2=3   * @author liudong   */ public final class URLMappingServlet extends HttpServlet {        private final static Log log = LogFactory.getLog(URLMappingServlet. class );             public final static String CURRENT_URI = "current_uri" ; //{index}      public final static String REQUEST_URI = "request_uri" ; //{/index}            private final static String DEFAULT_INDEX_PAGE = "index.vm" ;      private final static String PAGE_EXTENSION = ".vm" ;      private final static char URL_SEPERATOR = '/' ;        private String default_base;      private HashMap<String, String> other_base = new HashMap<String, String>();            private String rootDomain = "oschina.net" ;            @Override      @SuppressWarnings ( "unchecked" )      public void init() throws ServletException {          Enumeration<String> names = getInitParameterNames();          while (names.hasMoreElements()){              String name = names.nextElement();              String v = getInitParameter(name);              if ( "default" .equalsIgnoreCase(name)){                  default_base = v;                  continue ;              }              for (String n : StringUtils.split(name, ',' )){                  other_base.put(n, v);              }          }      }        private String _GetTemplateBase(HttpServletRequest req) {          String base = null ;          String prefix = req.getServerName().toLowerCase();          base = other_base.get(prefix);          if (base != null )              return base;          int idx = prefix.indexOf(rootDomain);          if (idx > 0 ){              prefix = prefix.substring( 0 , idx - 1 );              base = other_base.get(prefix);          }          return (base== null )?default_base:base;      }            /**       * 运行页面映射过程       * @param req       * @param res       * @throws ServletException       * @throws IOException       */      protected void perform(HttpServletRequest req, HttpServletResponse res)              throws ServletException, IOException {            StringBuilder show_page = new StringBuilder(_GetTemplateBase(req));          String prefix = req.getServletPath().substring( 1 );          String spath = req.getRequestURI();          req.setAttribute(REQUEST_URI, spath);          req.setAttribute(CURRENT_URI, prefix);          //解析URL地址          String[] s_result = spath.substring( 1 ).split(String.valueOf(URL_SEPERATOR));          if (s_result.length== 1 ){              show_page.append(prefix);              show_page.append(URL_SEPERATOR);              show_page.append(DEFAULT_INDEX_PAGE);          }          else {              show_page.append(prefix);              show_page.append(URL_SEPERATOR);              // Ex: http://www.oschina.net/admin/login/ld              StringBuilder testPath = new StringBuilder(show_page);              testPath.append(s_result[ 1 ]);              testPath.append(PAGE_EXTENSION);              boolean isVM = _IsVmExist(testPath.toString());              int param_idx = 1 ;              if (isVM){                  show_page.append(s_result[ 1 ]);                  show_page.append(PAGE_EXTENSION);                  param_idx = 2 ;              }              else {                  show_page.append(DEFAULT_INDEX_PAGE);              }              for ( int i=param_idx;i<s_result.length;i++){                  if (i==param_idx)                      show_page.append( '?' );                  else                      show_page.append( '&' );                  show_page.append( 'p' );                  show_page.append((i-param_idx+ 1 ));                  show_page.append( '=' );                  show_page.append(s_result[i]);              }              testPath.setLength( 0 );              testPath = null ;          }          if (log.isDebugEnabled())              log.debug( "request_uri=" +spath+ ",servlet_path=" +                              req.getServletPath()+ ",vm=" +show_page);          //运行真实的页面          RequestDispatcher rd = getServletContext().getRequestDispatcher(show_page.toString());          rd.forward(req, res);                  }        private final static List<String> vm_cache = new Vector<String>();            /**       * 推断某个页面是否存在。假设存在则缓存此结果       * @param path       * @return       */      private boolean _IsVmExist(String path){          if (vm_cache.contains(path))              return true ;          File testFile = new File(getServletContext().getRealPath(path));          boolean isVM = testFile.exists() && testFile.isFile();          if (isVM)              vm_cache.add(path);          return isVM;      }            @Override      protected void doGet(HttpServletRequest req, HttpServletResponse resp)              throws ServletException, IOException {          perform(req, resp);      }        @Override      protected void doPost(HttpServletRequest req, HttpServletResponse resp)              throws ServletException, IOException {          perform(req, resp);      }   }

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