OSChina 的URL类的源代码重写过程

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 http://www.oschina.net/code/snippet_12_2832

标签：
OSCHINA

[1].[代码] URLMappingServlet.java 跳至 

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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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