OSChina 其中很重要的一类——RequestContext

RequestContext 这个类在 OSChina 中是很重要的一个类。该类由全局 Filter 进行初始化。并传递给包含 Action 和 页面中直接使用。使用时通过 RequestContext.get() 来获取当前请求上下文实例。 这种方法基本的功能包含：自己主动转码、处理文件上传、登录信息处理，以及一些跟请求相关的经常用法封装。 假设你从中发现了什么问题。请指教。

标签： OSCHINA

[1].[代码] java代码 跳至 [1]

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package my.mvc;   import java.io.*; import java.net.*; import java.text.*; import java.util.*;   import javax.servlet.*; import javax.servlet.http.*;   import my.util.CryptUtils; import my.util.Multimedia; import my.util.RequestUtils; import my.util.ResourceUtils; import net.oschina.beans.User;   import org.apache.commons.beanutils.BeanUtils; import org.apache.commons.beanutils.ConvertUtils; import org.apache.commons.beanutils.Converter; import org.apache.commons.beanutils.converters.SqlDateConverter; import org.apache.commons.codec.binary.Base64; import org.apache.commons.io.FileUtils; import org.apache.commons.lang.RandomStringUtils; import org.apache.commons.lang.StringUtils; import org.apache.commons.lang.math.NumberUtils; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory;   /**  * 请求上下文  * @author Winter Lau  * @date 2010-1-13 下午04:18:00  */ public class RequestContext {           private final static Log log = LogFactory.getLog(RequestContext.class);       private final static int MAX_FILE_SIZE = 10*1024*1024;     private final static String UTF_8 = "UTF-8";           private final static ThreadLocal<RequestContext> contexts = new ThreadLocal<RequestContext>();     private final static boolean isResin;     private final static String upload_tmp_path;     private final static String TEMP_UPLOAD_PATH_ATTR_NAME = "$OSCHINA_TEMP_UPLOAD_PATH$";       private static String webroot = null;           private ServletContext context;     private HttpSession session;     private HttpServletRequest request;     private HttpServletResponse response;     private Map<String, Cookie> cookies;           static {         webroot = getWebrootPath();         isResin = _CheckResinVersion();         //上传的暂时文件夹         upload_tmp_path = webroot + "WEB-INF" + File.separator + "tmp" + File.separator;         try {             FileUtils.forceMkdir(new File(upload_tmp_path));         } catch (IOException excp) {}                   //BeanUtils对时间转换的初始化设置         ConvertUtils.register(new SqlDateConverter(null), java.sql.Date.class);         ConvertUtils.register(new Converter(){             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-M-d");             SimpleDateFormat sdf_time = new SimpleDateFormat("yyyy-M-d H:m");             @SuppressWarnings("rawtypes")             public Object convert(Class type, Object value) {                 if(value == null) return null;                 if (value instanceof Date) return (value);                 try {                     return sdf_time.parse(value.toString());                 } catch (ParseException e) {                     try {                         return sdf.parse(value.toString());                     } catch (ParseException e1) {                         return null;                     }                 }             }}, java.util.Date.class);     }           private final static String getWebrootPath() {         String root = RequestContext.class.getResource("/").getFile();         try {             root = new File(root).getParentFile().getParentFile().getCanonicalPath();             root += File.separator;         } catch (IOException e) {             throw new RuntimeException(e);         }         return root;     }           /**      * 初始化请求上下文      * @param ctx      * @param req      * @param res      */     public static RequestContext begin(ServletContext ctx, HttpServletRequest req, HttpServletResponse res) {         RequestContext rc = new RequestContext();         rc.context = ctx;         rc.request = _AutoUploadRequest(_AutoEncodingRequest(req));         rc.response = res;         rc.response.setCharacterEncoding(UTF_8);         rc.session = req.getSession(false);         rc.cookies = new HashMap<String, Cookie>();         Cookie[] cookies = req.getCookies();         if(cookies != null)             for(Cookie ck : cookies) {                 rc.cookies.put(ck.getName(), ck);             }         contexts.set(rc);         return rc;     }       /**      * 返回Web应用的路径      * @return      */     public static String root() { return webroot; }           /**      * 获取当前请求的上下文      * @return      */     public static RequestContext get(){         return contexts.get();     }           public void end() {         String tmpPath = (String)request.getAttribute(TEMP_UPLOAD_PATH_ATTR_NAME);         if(tmpPath != null){             try {                 FileUtils.deleteDirectory(new File(tmpPath));             } catch (IOException e) {                 log.fatal("Failed to cleanup upload directory: " + tmpPath, e);             }         }         this.context = null;         this.request = null;         this.response = null;         this.session = null;         this.cookies = null;         contexts.remove();     }           public Locale locale(){ return request.getLocale(); }       public void closeCache(){         header("Pragma","No-cache");         header("Cache-Control","no-cache");         header("Expires", 0L);     }           /**      * 自己主动编码处理      * @param req      * @return      */     private static HttpServletRequest _AutoEncodingRequest(HttpServletRequest req) {         if(req instanceof RequestProxy)             return req;         HttpServletRequest auto_encoding_req = req;         if("POST".equalsIgnoreCase(req.getMethod())){             try {                 auto_encoding_req.setCharacterEncoding(UTF_8);             } catch (UnsupportedEncodingException e) {}         }         else if(!isResin)             auto_encoding_req = new RequestProxy(req, UTF_8);                   return auto_encoding_req;     }           /**      * 自己主动文件上传请求的封装      * @param req      * @return      */     private static HttpServletRequest _AutoUploadRequest(HttpServletRequest req){         if(_IsMultipart(req)){             String path = upload_tmp_path + RandomStringUtils.randomAlphanumeric(10);             File dir = new File(path);             if(!dir.exists() && !dir.isDirectory()) dir.mkdirs();             try{                 req.setAttribute(TEMP_UPLOAD_PATH_ATTR_NAME,path);                 return new MultipartRequest(req, dir.getCanonicalPath(), MAX_FILE_SIZE, UTF_8);             }catch(NullPointerException e){                         }catch(IOException e){                 log.fatal("Failed to save upload files into temp directory: " + path, e);             }         }         return req;     }           public long id() {         return param("id", 0L);     }           public String ip(){         return RequestUtils.getRemoteAddr(request);     }           @SuppressWarnings("unchecked")     public Enumeration<String> params() {         return request.getParameterNames();     }           public String param(String name, String...def_value) {         String v = request.getParameter(name);         return (v!=null)?v:((def_value.length>0)? def_value[0]:null);     }           public long param(String name, long def_value) {         return NumberUtils.toLong(param(name), def_value);     }       public int param(String name, int def_value) {         return NumberUtils.toInt(param(name), def_value);     }       public byte param(String name, byte def_value) {         return (byte)NumberUtils.toInt(param(name), def_value);     }       public String[] params(String name) {         return request.getParameterValues(name);     }       public long[] lparams(String name){         String[] values = params(name);         if(values==null) return null;         return (long[])ConvertUtils.convert(values, long.class);     }           public String uri(){         return request.getRequestURI();     }           public String contextPath(){         return request.getContextPath();     }           public void redirect(String uri) throws IOException {         response.sendRedirect(uri);     }           public void forward(String uri) throws ServletException, IOException {         RequestDispatcher rd = context.getRequestDispatcher(uri);         rd.forward(request, response);     }       public void include(String uri) throws ServletException, IOException {         RequestDispatcher rd = context.getRequestDispatcher(uri);         rd.include(request, response);     }           public boolean isUpload(){         return (request instanceof MultipartRequest);     }     public File file(String fieldName) {         if(request instanceof MultipartRequest)             return ((MultipartRequest)request).getFile(fieldName);         return null;     }     public File image(String fieldname) {         File imgFile = file(fieldname);         return (imgFile!=null&&Multimedia.isImageFile(imgFile.getName()))?imgFile:null;     }           public boolean isRobot(){         return RequestUtils.isRobot(request);     }       public ActionException fromResource(String bundle, String key, Object...args){         String res = ResourceUtils.getStringForLocale(request.getLocale(), bundle, key, args);         return new ActionException(res);     }       public ActionException error(String key, Object...args){                return fromResource("error", key, args);     }           /**      * 输出信息到浏览器      * @param msg      * @throws IOException      */     public void print(Object msg) throws IOException {         if(!UTF_8.equalsIgnoreCase(response.getCharacterEncoding()))             response.setCharacterEncoding(UTF_8);         response.getWriter().print(msg);     }       public void output_json(String[] key, Object[] value) throws IOException {         StringBuilder json = new StringBuilder("{");         for(int i=0;i<key.length;i++){             if(i>0)                 json.append(',');             boolean isNum = value[i] instanceof Number ;             json.append("\"");             json.append(key[i]);             json.append("\":");             if(!isNum) json.append("\"");             json.append(value[i]);             if(!isNum) json.append("\"");         }         json.append("}");         print(json.toString());     }       public void output_json(String key, Object value) throws IOException {         output_json(new String[]{key}, new Object[]{value});     }     public void error(int code, String...msg) throws IOException {         if(msg.length>0)             response.sendError(code, msg[0]);         else             response.sendError(code);     }           public void forbidden() throws IOException {         error(HttpServletResponse.SC_FORBIDDEN);     }       public void not_found() throws IOException {         error(HttpServletResponse.SC_NOT_FOUND);     }       public ServletContext context() { return context; }     public HttpSession session() { return session; }     public HttpSession session(boolean create) {         return (session==null && create)? (session=request.getSession()):session;     }     public Object sessionAttr(String attr) {         HttpSession ssn = session();         return (ssn!=null)? ssn.getAttribute(attr):null;     }     public HttpServletRequest request() { return request; }     public HttpServletResponse response() { return response; }     public Cookie cookie(String name) { return cookies.get(name); }     public void cookie(String name, String value, int max_age, boolean all_sub_domain) {         RequestUtils.setCookie(request, response, name, value, max_age, all_sub_domain);     }     public void deleteCookie(String name,boolean all_domain) { RequestUtils.deleteCookie(request, response, name, all_domain); }     public String header(String name) { return request.getHeader(name); }     public void header(String name, String value) { response.setHeader(name, value); }     public void header(String name, int value) { response.setIntHeader(name, value); }     public void header(String name, long value) { response.setDateHeader(name, value); }       /**      * 将HTTP请求參数映射到bean对象中      * @param req      * @param beanClass      * @return      * @throws Exception      */     public <T> T form(Class<T> beanClass) {         try{             T bean = beanClass.newInstance();             BeanUtils.populate(bean, request.getParameterMap());             return bean;         }catch(Exception e) {             throw new ActionException(e.getMessage());         }     }           /**      * 返回当前登录的用户资料      * @return      */     public IUser user() {         return User.GetLoginUser(request);     }           /**      * 保存登录信息      * @param req      * @param res      * @param user      * @param save      */     public void saveUserInCookie(IUser user, boolean save) {         String new_value = _GenLoginKey(user, ip(), header("user-agent"));         int max_age = save ? MAX_AGE : -1;         deleteCookie(COOKIE_LOGIN, true);         cookie(COOKIE_LOGIN,new_value,max_age,true);     }       public void deleteUserInCookie() {         deleteCookie(COOKIE_LOGIN, true);     }           /**      * 3.0 以上版本号的 Resin 无需对URL參数进行转码      * @return      */     private final static boolean _CheckResinVersion() {         try{             Class<? > verClass = Class.forName("com.caucho.Version");             String ver = (String)verClass.getDeclaredField("VERSION").get(verClass);             String mainVer = ver.substring(0, ver.lastIndexOf('.'));             /**             float fVer = Float.parseFloat(mainVer);             System.out.println("----------------> " + fVer);             */             return Float.parseFloat(mainVer) > 3.0;         }catch(Throwable t) {}         return false;     }         /**      * 自己主动解码      * @author liudong      */     private static class RequestProxy extends HttpServletRequestWrapper {         private String uri_encoding;         RequestProxy(HttpServletRequest request, String encoding){             super(request);             this.uri_encoding = encoding;         }                   /**          * 重载getParameter          */         public String getParameter(String paramName) {             String value = super.getParameter(paramName);             return _DecodeParamValue(value);         }           /**          * 重载getParameterMap          */         @SuppressWarnings({ "unchecked", "rawtypes" })         public Map<String, Object> getParameterMap() {             Map params = super.getParameterMap();             HashMap<String, Object> new_params = new HashMap<String, Object>();             Iterator<String> iter = params.keySet().iterator();             while(iter.hasNext()){                 String key = (String)iter.next();                 Object oValue = params.get(key);                 if(oValue.getClass().isArray()){                     String[] values = (String[])params.get(key);                     String[] new_values = new String[values.length];                     for(int i=0;i<values.length;i++)                         new_values[i] = _DecodeParamValue(values[i]);                                           new_params.put(key, new_values);                 }                 else{                     String value = (String)params.get(key);                     String new_value = _DecodeParamValue(value);                     if(new_value!=null)                         new_params.put(key,new_value);                 }             }             return new_params;         }           /**          * 重载getParameterValues          */         public String[] getParameterValues(String arg0) {             String[] values = super.getParameterValues(arg0);             for(int i=0;values!=null&&i<values.length;i++)                 values[i] = _DecodeParamValue(values[i]);             return values;         }           /**          * 參数转码          * @param value          * @return          */         private String _DecodeParamValue(String value){             if (StringUtils.isBlank(value) || StringUtils.isBlank(uri_encoding)                     || StringUtils.isNumeric(value))                 return value;                   try{                 return new String(value.getBytes("8859_1"), uri_encoding);             }catch(Exception e){}             return value;         }       }           private static boolean _IsMultipart(HttpServletRequest req) {         return ((req.getContentType() != null) && (req.getContentType()                 .toLowerCase().startsWith("multipart")));     }       /**      * 生成用户登录标识字符串      * @param user      * @param ip      * @param user_agent      * @return      */     public static String _GenLoginKey(IUser user, String ip, String user_agent) {         StringBuilder sb = new StringBuilder();         sb.append(user.getId());         sb.append('|');         sb.append(user.getPwd());         sb.append('|');         sb.append(ip);         sb.append('|');         sb.append((user_agent==null)?0:user_agent.hashCode());         sb.append('|');         sb.append(System.currentTimeMillis());         return _Encrypt(sb.toString());     }       /**      * 加密      * @param value      * @return      * @throws Exception      */     private static String _Encrypt(String value) {         byte[] data = CryptUtils.encrypt(value.getBytes(), E_KEY);         try{             return URLEncoder.encode(new String(Base64.encodeBase64(data)), UTF_8);         }catch(UnsupportedEncodingException e){             return null;         }     }       /**      * 解密      * @param value      * @return      * @throws Exception      */     private static String _Decrypt(String value) {         try {             value = URLDecoder.decode(value,UTF_8);             if(StringUtils.isBlank(value)) return null;             byte[] data = Base64.decodeBase64(value.getBytes());             return new String(CryptUtils.decrypt(data, E_KEY));         } catch (UnsupportedEncodingException excp) {             return null;         }     }         /**      * 从cookie中读取保存的用户信息      * @param req      * @return      */     public IUser getUserFromCookie() {         try{             Cookie cookie = cookie(COOKIE_LOGIN);             if(cookie!=null && StringUtils.isNotBlank(cookie.getValue())){                 return userFromUUID(cookie.getValue());             }         }catch(Exception e){}         return null;     }       /**      * 从cookie中读取保存的用户信息      * @param req      * @return      */     public IUser userFromUUID(String uuid) {         if(StringUtils.isBlank(uuid))             return null;         String ck = _Decrypt(uuid);         final String[] items = StringUtils.split(ck, '|');         if(items.length == 5){             String ua = header("user-agent");             int ua_code = (ua==null)?0:ua.hashCode();             int old_ua_code = Integer.parseInt(items[3]);             if(ua_code == old_ua_code){                 return new IUser(){                     public boolean IsBlocked() { return false; }                     public long getId() { return NumberUtils.toLong(items[0],-1L); }                     public String getPwd() { return items[1]; }                     public byte getRole() { return IUser.ROLE_GENERAL; }                 };             }         }         return null;     }           public final static String COOKIE_LOGIN = "oscid";     private final static int MAX_AGE = 86400 * 365;     private final static byte[] E_KEY = new byte[]{'1','2','3','4','5','6','7','8'}; }

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