Java tutorial
/* * Copyright 1998-2012 Linux.org.ru * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package ru.org.linux.exception; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver; import ru.org.linux.site.ScriptErrorException; import ru.org.linux.site.Template; import ru.org.linux.spring.Configuration; import ru.org.linux.user.UserErrorException; import ru.org.linux.util.StringUtil; import javax.mail.Message; import javax.mail.Session; import javax.mail.Transport; import javax.mail.internet.AddressException; import javax.mail.internet.InternetAddress; import javax.mail.internet.MimeMessage; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.PrintWriter; import java.io.StringWriter; import java.util.Date; import java.util.Enumeration; import java.util.Properties; /** * ??. ? ? ?. */ @Component public class ExceptionResolver extends SimpleMappingExceptionResolver { private static final Log logger = LogFactory.getLog(ExceptionResolver.class); private static final String EMAIL_SENT = " ? . ?? ? ?."; private static final String EMAIL_NOT_SENT = " ? . ? ? ?? ."; @Autowired private Configuration configuration; enum ExceptionType { IGNORED, SCRIPT_ERROR, OTHER } /** * ? ?. * ? ?? ? . * * @param request ? web- * @param response web- * @param handler , ? * @param ex ? * @return web- */ @Override protected ModelAndView doResolveException(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) { // http://stackoverflow.com/questions/8271843/how-to-exclude-clientabortexception-from-simplemappingexceptionresolver if (ex != null && ex.getClass().getName().endsWith(".ClientAbortException") && response.isCommitted()) { return null; } ModelAndView modelAndView = super.doResolveException(request, response, handler, ex); if (modelAndView == null) { modelAndView = new ModelAndView("errors/common"); prepareModelForCommonException(modelAndView, request, ex); } modelAndView.addObject("exception", ex); response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); return modelAndView; } /** * ? web- ? . * * @param modelAndView web- * @param request ? web- * @param exception ? */ private void prepareModelForCommonException(ModelAndView modelAndView, HttpServletRequest request, Exception exception) { modelAndView.addObject("headTitle", StringUtil.escapeHtml(exception.getClass().getName())); String errorMessage = exception.getMessage() == null ? StringUtil.escapeHtml(exception.getClass().getName()) : StringUtil.escapeHtml(exception.getMessage()); modelAndView.addObject("errorMessage", errorMessage); ExceptionType exceptionType = ExceptionType.OTHER; if (exception instanceof UserErrorException) { exceptionType = ExceptionType.IGNORED; } else if (exception instanceof ScriptErrorException) { logger.debug("errors/common.jsp", exception); exceptionType = ExceptionType.SCRIPT_ERROR; } else { logger.warn("Unexcepted exception caught", exception); String infoMessage = sendEmailToAdmin(request, exception); modelAndView.addObject("infoMessage", infoMessage); } modelAndView.addObject("exceptionType", exceptionType.name()); } /** * ? E-mail ?. * * @param request ? web- * @param exception ? * @return , ? ??? ? ? */ private String sendEmailToAdmin(HttpServletRequest request, Exception exception) { InternetAddress mail; String adminEmailAddress = configuration.getAdminEmailAddress(); try { mail = new InternetAddress(adminEmailAddress, true); } catch (AddressException e) { return EMAIL_NOT_SENT + " ? e-mail ?: " + adminEmailAddress; } StringBuilder text = new StringBuilder(); if (exception.getMessage() == null) { text.append(exception.getClass().getName()); } else { text.append(exception.getMessage()); } text.append("\n\n"); Template tmpl = Template.getTemplate(request); // text.append("Main URL: ").append(tmpl.getMainUrl()).append(request.getAttribute("javax.servlet.error.request_uri")); String mainUrl = "<unknown>"; mainUrl = configuration.getMainUrl(); text.append("Main URL: ").append(mainUrl).append(request.getServletPath()); if (request.getQueryString() != null) { text.append('?').append(request.getQueryString()).append('\n'); } text.append('\n'); text.append("IP: " + request.getRemoteAddr() + '\n'); text.append(" Headers: "); Enumeration enu = request.getHeaderNames(); while (enu.hasMoreElements()) { String paramName = (String) enu.nextElement(); text.append("\n ").append(paramName).append(": ").append(request.getHeader(paramName)); } text.append("\n\n"); StringWriter exceptionStackTrace = new StringWriter(); exception.printStackTrace(new PrintWriter(exceptionStackTrace)); text.append(exceptionStackTrace.toString()); Properties props = new Properties(); props.put("mail.smtp.host", "localhost"); Session mailSession = Session.getDefaultInstance(props, null); MimeMessage emailMessage = new MimeMessage(mailSession); try { emailMessage.setFrom(new InternetAddress("no-reply@linux.org.ru")); emailMessage.addRecipient(Message.RecipientType.TO, mail); emailMessage.setSubject("Linux.org.ru: " + exception.getClass()); emailMessage.setSentDate(new Date()); emailMessage.setText(text.toString(), "UTF-8"); } catch (Exception e) { logger.error("An error occured while creating e-mail!", e); return EMAIL_NOT_SENT; } try { Transport.send(emailMessage); return EMAIL_SENT; } catch (Exception e) { return EMAIL_NOT_SENT; } } }