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]
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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? *
@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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