使用apache commons-email將錯誤日誌發送到指定郵箱

原文地址：http://ketayao.com/view/33html
web開發，有個場景，但願將錯誤日誌發送到指定郵箱，這樣能夠作到遠程監控，實時處理。下面寫一個利用apache commons email的例子，發送錯誤日誌的例子。java
 
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       /** 
     
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        *  
     
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        * @author  <a href="mailto:ketayao@gmail.com">ketayao</a> 
     
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        * @since   2013年9月7日 下午6:27:05 
     
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        */ 
     
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       public class EmailExceptionHandler extends ExceptionHandler { 
     
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           private static final Logger log = LoggerFactory.getLogger(EmailExceptionHandler.class); 
     
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           /** 
     
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            * 報告錯誤信息 
     
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            * @param req 
     
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            * @param excp 
     
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            */ 
     
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           public static void reportError(HttpServletRequest req, Throwable excp){ 
     
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               boolean is_localhost = (req!=null)?"127.0.0.1".equals(RequestUtils.getRemoteAddr(req)):false; 
     
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               Throwable t = excp; 
     
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               if(t == null) t = _getException(req); 
     
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               if(t == null) return ; 
     
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               log.error("System Exception", t); 
     
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               if(!is_localhost) 
     
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               //發送電子郵件通知 
     
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               try { 
     
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                   String email = SystemConfig.getConfig().get("blog.exception.email.to"); 
     
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                   String title = "錯誤" + t.getClass().getSimpleName(); 
     
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                   String content = getErrorHtml(req, t); 
     
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                   //發送郵件到指定郵箱 
     
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                   _sendHtmlMail(Arrays.asList(StringUtils.split(email,",")), title, content); 
     
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               } catch (Exception e) { 
     
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                   log.error("Failed to send error report.", e); 
     
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               } 
     
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           } 
     
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           /**  
     
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            * 描述 
     
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            * @param asList 
     
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            * @param title 
     
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            * @param content  
     
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            * @throws Exception 
     
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            */ 
     
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           private static void _sendHtmlMail(List<String> emailAddress, String title, 
     
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                   String content) throws Exception { 
     
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               for (String address : emailAddress) { 
     
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                   HtmlEmail email = new HtmlEmail(); 
     
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                   email.setStartTLSEnabled(true); 
     
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                   email.setHostName(SystemConfig.getConfig().get("blog.exception.email.hotname")); 
     
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                   email.setAuthentication(SystemConfig.getConfig().get("blog.exception.email.name"), 
     
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                           SystemConfig.getConfig().get("blog.exception.email.password")); 
     
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                   email.setFrom(SystemConfig.getConfig().get("blog.exception.email.name")); 
     
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                   email.addTo(address); 
     
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                   email.setSubject(title); 
     
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                   // set the html message 
     
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                   email.setHtmlMsg(content); 
     
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                   // set the alternative message 
     
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                   email.setTextMsg("Your email client does not support HTML messages"); 
     
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                   email.send(); 
     
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               } 
     
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           } 
     
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           /** 
     
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            * 格式化錯誤信息 
     
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            * @param req 
     
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            * @param t 錯誤信息 
     
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            * @param site 出錯的我的空間 
     
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            * @return 
     
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            * <h2>Request Headers</h2> 
     
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            */ 
     
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           @SuppressWarnings("rawtypes") 
     
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           public static String getErrorHtml(HttpServletRequest req, Throwable t) { 
     
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               StringBuilder html = new StringBuilder(); 
     
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               if(req != null){ 
     
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                   html.append("<h2>Request Headers</h2><table>");   
     
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                   html.append("<tr><th>Request URL</th><td>"); 
     
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                   html.append(req.getRequestURL().toString()); 
     
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                   if(req.getQueryString()!=null){ 
     
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                       html.append('?'); 
     
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                       html.append(req.getQueryString());                      
     
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                   } 
     
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                   html.append("</td></tr>"); 
     
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                   html.append("<tr><th>Remote Addr</th><td>"); 
     
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                   html.append(RequestUtils.getRemoteAddr(req)); 
     
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                   html.append("</td></tr>"); 
     
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                   html.append("<tr><th>Request Method</th><td>"); 
     
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                   html.append(req.getMethod()); 
     
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                   html.append("</td></tr>"); 
     
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                   html.append("<tr><th>CharacterEncoding</th><td>"); 
     
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                   html.append(req.getCharacterEncoding()); 
     
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                   html.append("</td></tr>"); 
     
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                   html.append("<tr><th>Request Locale</th><td>"); 
     
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                   html.append(req.getLocale()); 
     
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                   html.append("</td></tr>"); 
     
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                   html.append("<tr><th>Content Type</th><td>"); 
     
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                   html.append(req.getContentType()); 
     
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                   html.append("</td></tr>"); 
     
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                   Enumeration headers = req.getHeaderNames(); 
     
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                   while(headers.hasMoreElements()){ 
     
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                       String key = (String)headers.nextElement(); 
     
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                       html.append("<tr><th>"); 
     
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                       html.append(key); 
     
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                       html.append("</th><td>"); 
     
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                       html.append(req.getHeader(key)); 
     
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                       html.append("</td></tr>"); 
     
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                   }       
     
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                   html.append("</table><h2>Request Parameters</h2><table>");      
     
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                   Enumeration params = req.getParameterNames(); 
     
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                   while(params.hasMoreElements()){ 
     
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                       String key = (String)params.nextElement(); 
     
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                       html.append("<tr><th>"); 
     
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                       html.append(key); 
     
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                       html.append("</th><td>"); 
     
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                       html.append(req.getParameter(key)); 
     
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                       html.append("</td></tr>"); 
     
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                   } 
     
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                   html.append("</table>"); 
     
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               } 
     
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               html.append("<h2>"); 
     
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               html.append(t.getClass().getName()); 
     
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               html.append('('); 
     
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               html.append(DateFormatUtils.format(System.currentTimeMillis(), "yyyy-MM-dd HH:mm:ss")); 
     
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               html.append(")</h2><pre>"); 
     
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               try { 
     
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                   html.append(_exception(t)); 
     
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               } catch (IOException ex) {} 
     
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               html.append("</pre>"); 
     
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               html.append("<h2>System Properties</h2><table>");     
     
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               Set props = System.getProperties().keySet(); 
     
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               for(Object prop : props){ 
     
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                   html.append("<tr><th>"); 
     
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                   html.append(prop); 
     
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                   html.append("</th><td>"); 
     
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                   html.append(System.getProperty((String)prop)); 
     
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                   html.append("</td></tr>"); 
     
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               } 
     
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               html.append("</table>"); 
     
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               return html.toString(); 
     
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           } 
     
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           /** 
     
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            * 將當前上下文發生的異常轉爲字符串 
     
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            * @return 
     
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            * @throws IOException 
     
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            */ 
     
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           private static Throwable _getException(HttpServletRequest req) { 
     
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               if(req == null) return null; 
     
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               Throwable t = (Throwable)req.getAttribute("javax.servlet.jsp.jspException"); 
     
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               if(t==null){ 
     
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                   //Tomcat的錯誤處理方式 
     
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                   t = (Throwable)req.getAttribute("javax.servlet.error.exception"); 
     
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               } 
     
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               return t; 
     
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           } 
     
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           /** 
     
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            * 將異常信息轉化成字符串 
     
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            * @param t 
     
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            * @return 
     
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            * @throws IOException 
     
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            */ 
     
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           private static String _exception(Throwable t) throws IOException{ 
     
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               if(t == null) 
     
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                   return null; 
     
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               ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
     
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               try{ 
     
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                   t.printStackTrace(new PrintStream(baos)); 
     
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               }finally{ 
     
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                   baos.close(); 
     
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               } 
     
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               return baos.toString(); 
     
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           } 
     
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           /**   
     
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            * @param rc 
     
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            * @param exception 
     
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            * @return  
     
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            * @see com.ketayao.fensy.handler.Handler#handle(com.ketayao.fensy.mvc.RequestContext, java.lang.Exception)  
     
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            */ 
     
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           @Override 
     
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           public String handle(final RequestContext rc, final Exception exception) { 
     
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               String view = super.handle(rc, exception); 
     
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               Thread thread = new Thread(new Runnable() { 
     
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                   @Override