OSChina 的URL类的源代码重写过程

2021-10-12 01:12:47

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 

code=5#6" style="font-weight:normal; font-size:9pt; text-decoration:none">[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?

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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