功能

提供異步發送郵件功能。

package org.mall.utils.email;

import java.net.MalformedURLException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.apache.commons.mail.EmailException;
import org.apache.commons.mail.HtmlEmail;
import org.apache.log4j.Logger;
import org.mall.utils.ListUtil;
import org.mall.utils.PropertiesUtils;
import org.mall.utils.log.LoggerUtils;

/**
 * @description 郵件發送工具類
 * @author <a href="mailto:fengwuze@kk.com">fengwuze</a>
 * @since 2016年9月20日
 * @version 1.0.0
 */
public class EmailUtils {
    
    private static Logger logger = Logger.getLogger(EmailUtils.class);
    
    private static ExecutorService exc = new ThreadPoolExecutor(10, 100, 120L, TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
    
    private static String fromEmail = "kk@gmail.com";
    private static String fromName = "kk";
    
    private static String sendUserName = "fengwuze@kk.com";
    private static String sendPassword = "xxxoooxxxooo";
    
    /**
     * 發送郵件
     * 
     * @param toEmails      收件人列表
     * @param subject       主題
     * @param emailMsg      郵件內容
     */
    public static void sendEmail(String toEmails, String subject, String emailMsg) {
        EmailVo emailVo = new EmailVo();
        emailVo.toEmails = toEmails;
        emailVo.subject = subject;
        emailVo.emailMsg = emailMsg;
        
        sendEmail(new EmailTask(emailVo));
    }
    
    /**
     * 發送郵件（郵件模板）
     * 
     * @param toEmails      收件人列表
     * @param subject       主題
     * @param emailMsg      郵件內容
     */
    public static void sendEmailTemplet(String toEmails, String subject, String templetPath, Map<String, Object> templetParam) {
        EmailVo emailVo = new EmailVo();
        emailVo.toEmails = toEmails;
        emailVo.subject = subject;
        emailVo.emailMsg = EmailTemplateUtils.formatEmailContent(templetPath, templetParam);
        
        sendEmail(new EmailTask(emailVo));
    }
    
    /**
     * 發送郵件
     * 
     * @param emailTask
     */
    public static void sendEmail(EmailTask emailTask) {
        exc.submit(emailTask);
    }
    
    /** 發送郵件Vo */
    static class EmailVo {
        public String toEmails;
        public String subject;
        public String emailMsg;
        public Integer retry = 0;
    }

    /** 發送郵件Task */
    public static class EmailTask implements Runnable {

        public final EmailVo vo;
        private EmailTask(EmailVo vo) {
            this.vo = vo;
        }

        @Override
        public void run() {
            try {
                HtmlEmail email = new HtmlEmail();
                email.setCharset("utf-8");

                email.setHostName("smtp.gmail.com");
                email.setSmtpPort(587);
                email.setSslSmtpPort("465");
                email.setSSLOnConnect(true);

                email.setAuthentication(sendUserName, sendPassword);
                email.setFrom(fromEmail, fromName);
                email.setSocketConnectionTimeout(10000);
                email.setSocketTimeout(10000);

                List<String> toEmailList = ListUtil.asList(vo.toEmails, ",");
                for (String toEmail : toEmailList) {
                    email.addTo(toEmail);
                }

                email.setSubject(vo.subject);
                email.setHtmlMsg(vo.emailMsg);

                email.send();
                LoggerUtils.log(logger, "email send succ, toEmails: %s, subject: %s, emailMsg: %s", vo.toEmails, vo.subject, vo.emailMsg);
            } catch(Exception e) {
                e.printStackTrace();
                if(vo != null) {
                    if(vo.retry > 3) {
                        LoggerUtils.log(logger, e, "email send fail, toEmails: %s, subject: %s, emailMsg: %s", vo.toEmails, vo.subject, vo.emailMsg);
                        EmailUtils.sendEmail(new EmailTask(vo));
                    }
                }
            }
        }
    }

    public static void main(String[] args) throws EmailException, MalformedURLException {
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("name", "akkiiiii");
        
        EmailUtils.sendEmailTemplet("fengwuze@gmail.com", "HTML格式郵件測試", "/template/mall/welcome.vm", params);
    }
}

模板工具類

package org.mall.utils.email;

import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

import org.apache.velocity.Template;
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.app.VelocityEngine;

/**
 * @description 
 * @author <a href="mailto:fengwuze@kk.com">fengwuze</a>
 * @since 2016年9月20日
 * @version 1.0.0
 */
public class EmailTemplateUtils {
    
    private static VelocityEngine velocityEngine= new VelocityEngine();
    static {
        EmailTemplateUtils.velocityEngine.setProperty(Velocity.RESOURCE_LOADER, "class");
        EmailTemplateUtils.velocityEngine.setProperty("class.resource.loader.class",
                "org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader");
        EmailTemplateUtils.velocityEngine.init();
    }
    
    /**
     * 使用模塊技術來生成郵件內容
     * 
     * @param templatePath
     * @param params
     * @return String
     */
    public static String formatEmailContent(String templatePath, Map<String, Object> params) {
        Template t = velocityEngine.getTemplate(templatePath, "UTF-8");
        VelocityContext context = new VelocityContext();
        for (Map.Entry<String, Object> entry : params.entrySet()) {
            context.put(entry.getKey(), entry.getValue());
        }

        StringWriter writer = new StringWriter();
        t.merge(context, writer);
        
        return writer.toString();
    }
    
    public static void main(String[] args) {
        Map<String, Object> params = new HashMap<String, Object>();
        params.put("name", "akkiiiii");
        
        for(int i = 0; i < 100000;i++) {
            EmailTemplateUtils.formatEmailContent("/template/mall/welcome.vm", params);
        }
    }
}