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 [1]

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155

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);      }   }

版权声明：本文博客原创文章，博客，未经同意，不得转载。

转载于:https://www.cnblogs.com/blfshiye/p/4736982.html