Apache Commons Email使用心得

2018-07-20 来源：open-open

最近在项目中开发中需要用到发送邮件功能，当后台定时任务处理完毕后通知调用者。Java Mail API使用比较麻烦，所以这里采用的是Apache Commons Email，官网地址：http://commons.apache.org/proper/commons-email/，Commons Email API比较简洁高效，学习起来也很快。写篇文章跟大家分享一下，有问题的可以留言！

1、发送简单文本邮件

Email email = new SimpleEmail();
email.setHostName("smtp.googlemail.com");
email.setSmtpPort(465);
email.setAuthenticator(new DefaultAuthenticator("username", "password"));
email.setSSLOnConnect(true);
email.setFrom("user@gmail.com");
email.setSubject("TestMail");
email.setMsg("This is a test mail ... :-)");
email.addTo("foo@bar.com");
email.send();

2、发送带附件的邮件

// Create the attachment
  EmailAttachment attachment = new EmailAttachment();
  attachment.setPath("mypictures/john.jpg");
  attachment.setDisposition(EmailAttachment.ATTACHMENT);
  attachment.setDescription("Picture of John");
  attachment.setName("John");

  // Create the email message
  MultiPartEmail email = new MultiPartEmail();
  email.setHostName("mail.myserver.com");
  email.addTo("jdoe@somewhere.org", "John Doe");
  email.setFrom("me@apache.org", "Me");
  email.setSubject("The picture");
  email.setMsg("Here is the picture you wanted");

  // add the attachment
  email.attach(attachment);

  // send the email
  email.send();

另外还可以通过任意的链接来将网络上的文件添加到附件中，例如：

// Create the attachment
  EmailAttachment attachment = new EmailAttachment();
  attachment.setURL(new URL("http://www.apache.org/images/asf_logo_wide.gif"));
  attachment.setDisposition(EmailAttachment.ATTACHMENT);
  attachment.setDescription("Apache logo");
  attachment.setName("Apache logo");

  // Create the email message
  MultiPartEmail email = new MultiPartEmail();
  email.setHostName("mail.myserver.com");
  email.addTo("jdoe@somewhere.org", "John Doe");
  email.setFrom("me@apache.org", "Me");
  email.setSubject("The logo");
  email.setMsg("Here is Apache's logo");
  
  // add the attachment
  email.attach(attachment);

  // send the email
  email.send();

3、发送HTML格式的邮件

// Create the email message
  HtmlEmail email = new HtmlEmail();
  email.setHostName("mail.myserver.com");
  email.addTo("jdoe@somewhere.org", "John Doe");
  email.setFrom("me@apache.org", "Me");
  email.setSubject("Test email with inline image");
  
  // embed the image and get the content id
  URL url = new URL("http://www.apache.org/images/asf_logo_wide.gif");
  String cid = email.embed(url, "Apache logo");
  
  // set the html message
  email.setHtmlMsg("<html>The apache logo - <img src=\"cid:"+cid+"\"></html>");

  // set the alternative message
  email.setTextMsg("Your email client does not support HTML messages");

  // send the email
  email.send();

4、发送带图片的HTML格式邮件

// load your HTML email template
  String htmlEmailTemplate = ....

  // define you base URL to resolve relative resource locations
  URL url = new URL("http://www.apache.org");

  // create the email message
  HtmlEmail email = new ImageHtmlEmail();
  email.setDataSourceResolver(new DataSourceResolverImpl(url));
  email.setHostName("mail.myserver.com");
  email.addTo("jdoe@somewhere.org", "John Doe");
  email.setFrom("me@apache.org", "Me");
  email.setSubject("Test email with inline image");
  
  // set the html message
  email.setHtmlMsg(htmlEmailTemplate);

  // set the alternative message
  email.setTextMsg("Your email client does not support HTML messages");

  // send the email
  email.send();

另外，在使用过程中发现Email.addTo一次只能添加一个联系人，如果想发送给多个人的话，需要使用for循环嵌套来实现，以下是一个简单的例子：

public static void main(String[] args){

        String mailList = "abc@163.com;tt@qq.com";

        String[] list = mailList.split(";");
        for(int i=0;list!=null && i<list.length;i++){   //嵌套调用

            sendEmail(list[i]);
        }
    }

    public static void sendEmail(String target) {

        try{
            Email email = new SimpleEmail();
            email.setHostName("smtp.163.com");
            email.setSmtpPort(465);
            email.setAuthenticator(new DefaultAuthenticator("abc@163.com","abc"));
            email.setSSLOnConnect(true);
            email.setFrom("abc@163.com");
            email.addTo(target);

            email.setSubject("Test Mail");
            email.setMsg("This is a test mail");
            email.send();

        }catch (Exception e){
            e.printStackTrace();
        }
    }

详细教程可以参考官网UserGuide，链接：http://commons.apache.org/proper/commons-email/userguide.html

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