OSChina 的URL重写处理类源码

来源：互联网发布：以前java上的石器时代编辑：程序博客网时间：2024/05/29 13:58
此代码是 oschina 用来处理形如 http://www.oschina.net/p/tomcat 这样的URL的类
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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packagemy.view;
 
importjava.io.*;
importjava.util.*;
 
importjavax.servlet.*;
importjavax.servlet.http.*;
 
importorg.apache.commons.lang.StringUtils;
importorg.apache.commons.logging.Log;
importorg.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
 */
publicfinal class URLMappingServlet extendsHttpServlet {
 
    privatefinal static Log log = LogFactory.getLog(URLMappingServlet.class); 
     
    publicfinal static String CURRENT_URI = "current_uri";//{index}
    publicfinal static String REQUEST_URI = "request_uri";//{/index}
     
    privatefinal static String DEFAULT_INDEX_PAGE = "index.vm";
    privatefinal static String PAGE_EXTENSION = ".vm";
    privatefinal static char URL_SEPERATOR = '/';
 
    privateString default_base;
    privateHashMap<String, String> other_base = newHashMap<String, String>();
     
    privateString rootDomain = "oschina.net";
     
    @Override
    @SuppressWarnings("unchecked")
    publicvoid init() throwsServletException {
        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);
            }
        }
    }
 
    privateString _GetTemplateBase(HttpServletRequest req) {
        String base = null;
        String prefix = req.getServerName().toLowerCase();
        base = other_base.get(prefix);
        if(base != null)
            returnbase;
        intidx = prefix.indexOf(rootDomain);
        if(idx > 0){
            prefix = prefix.substring(0, idx - 1);
            base = other_base.get(prefix);
        }
        return(base==null)?default_base:base;
    }
     
    /**
     * 执行页面映射过程
     * @param req
     * @param res
     * @throws ServletException
     * @throws IOException
     */
    protectedvoid perform(HttpServletRequest req, HttpServletResponse res)
            throwsServletException, IOException {
 
        StringBuilder show_page = newStringBuilder(_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 = newStringBuilder(show_page);
            testPath.append(s_result[1]);
            testPath.append(PAGE_EXTENSION);
            booleanisVM = _IsVmExist(testPath.toString());
            intparam_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(inti=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);
        //执行真实的页面
        RequestDispatcher rd = getServletContext().getRequestDispatcher(show_page.toString());
        rd.forward(req, res);   
         
    }
 
    privatefinal static List<String> vm_cache = newVector<String>();
     
    /**
     * 判断某个页面是否存在，如果存在则缓存此结果
     * @param path
     * @return
     */
    privateboolean _IsVmExist(String path){
        if(vm_cache.contains(path))
            returntrue;
        File testFile = newFile(getServletContext().getRealPath(path));
        booleanisVM = testFile.exists() && testFile.isFile();
        if(isVM)
            vm_cache.add(path);
        returnisVM;
    }
     
    @Override
    protectedvoid doGet(HttpServletRequest req, HttpServletResponse resp)
            throwsServletException, IOException {
        perform(req, resp);
    }
 
    @Override
    protectedvoid doPost(HttpServletRequest req, HttpServletResponse resp)
            throwsServletException, IOException {
        perform(req, resp);
    }
 
}
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