使用apache commons-email将错误日志发送到指定邮箱

原文地址：http://ketayao.com/view/33
web开发，有个场景，希望将错误日志发送到指定邮箱，这样可以做到远程监控，实时处理。下面写一个利用apache commons email的例子，发送错误日志的例子。
001
/**

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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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 */

006
 
007
public class EmailExceptionHandler extends ExceptionHandler
 {

008
     
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    private static final Logger
 log = LoggerFactory.getLogger(EmailExceptionHandler.class);

010
     
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    /**

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     *
 报告错误信息

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     *
 @param req

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     *
 @param excp

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     */

016
    public static void reportError(HttpServletRequest
 req, Throwable excp){

017
        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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        //发送电子邮件通知

025
        try {

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            String
 email = SystemConfig.getConfig().get("blog.exception.email.to");

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            String
 title = "错误" +
 t.getClass().getSimpleName();

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            String
 content = getErrorHtml(req, t);

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            //发送邮件到指定邮箱

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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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     *
 格式化错误信息

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     *
 @param req

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     *
 @param t 错误信息

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     *
 @param site 出错的个人空间

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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>");

097
            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>");

118
            }

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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>");

126
        try {

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            html.append(_exception(t));

128
        } catch (IOException
 ex) {}

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        html.append("</pre>");

130
     
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        html.append("<h2>System
 Properties</h2><table>");    

132
        Set
 props = System.getProperties().keySet();

133
        for(Object
 prop : props){

134
            html.append("<tr><th>");

135
            html.append(prop);

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            html.append("</th><td>");

137
            html.append(System.getProperty((String)prop));

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            html.append("</td></tr>");

139
        }

140
        html.append("</table>");

141
        return html.toString();

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    }

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    /**

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     *
 将当前上下文发生的异常转为字符串

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     *
 @return

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     *
 @throws IOException

148
     */

149
    private static Throwable
 _getException(HttpServletRequest req) {

150
        if(req
 == null) return null;

151
        Throwable
 t = (Throwable)req.getAttribute("javax.servlet.jsp.jspException");

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        if(t==null){

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            //Tomcat的错误处理方式

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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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    /**

160
     *
 将异常信息转化成字符串

161
     *
 @param t

162
     *
 @return

163
     *
 @throws IOException

164
     */

165
    private static String
 _exception(Throwable t) throws IOException{

166
        if(t
 == null)

167
            return null;

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        ByteArrayOutputStream
 baos = new ByteArrayOutputStream();

169
        try{

170
            t.printStackTrace(new PrintStream(baos));

171
        }finally{

172
            baos.close();

173
        }

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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) 

182
     */

183
    @Override

184
    public String
 handle(final RequestContext
 rc, final Exception
 exception) {

185
        String
 view = super.handle(rc,
 exception);

186
         
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        Thread
 thread = new Thread(new Runnable()
 {

188
             
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            @Override

190
            public void run()
 {

191
                reportError(rc.request(),
 exception);

192
            }

193
        });

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        thread.start();

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        return view;

197
    }

198
 
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}