Collection of Java email sending tools

In modern society, email has become one of the important ways for people to communicate. Whether at work or in life, sending emails is a common operation. In Java development, how to send emails through programs has also become a common requirement. In order to simplify the development process, we can use some excellent Java email tool classes.

1. JavaMail API:
   JavaMail API is the core library for sending emails in Java officially provided by Oracle. It provides a set of API interfaces for sending and receiving emails, and can easily send and receive emails through SMTP, POP3, and IMAP protocols. Although the JavaMail API is powerful, for some simple email sending scenarios, a lot of code needs to be written to implement it. Therefore, it can be combined with other open source tool libraries to simplify development.
2. Apache Commons Email:
   Apache Commons Email is an open source project provided by the Apache Foundation. It encapsulates the JavaMail API and provides a more concise and easy-to-use way to send emails. With Apache Commons Email, you only need to write a small amount of code to quickly implement the email sending function.

The following is a sample code for sending emails using Apache Commons Email:

Email email = new SimpleEmail();
email.setHostName("smtp.qq.com");
email.setSmtpPort(587);
email.setAuthentication("yourusername@qq.com", "yourpassword");
email.setStartTLSEnabled(true);
email.setFrom("yourusername@qq.com");
email.setSubject("邮件主题");
email.setMsg("邮件内容");
email.addTo("recipient@example.com");
email.send();

3. Spring Framework:
   Spring Framework is a very popular and powerful Java development framework , also provides email support in its Modules. With Spring Framework, you can easily send emails using simple configuration. Spring Framework encapsulates the JavaMail API and provides a more concise interface for sending emails.

The following is a sample code for sending emails using Spring Framework:

<bean id="mailSender"  class="org.springframework.mail.javamail.JavaMailSenderImpl">
    <property name="host" value="smtp.qq.com"/>
    <property name="port" value="587"/>
    <property name="username" value="yourusername@qq.com"/>
    <property name="password" value="yourpassword"/>
    <property name="javaMailProperties">
        <props>
            <prop key="mail.smtp.auth">true</prop>
            <prop key="mail.smtp.starttls.enable">true</prop>
        </props>
    </property>
</bean>

<bean id="simpleMailMessage" class="org.springframework.mail.SimpleMailMessage">
    <property name="from" value="yourusername@qq.com"/>
    <property name="subject" value="邮件主题"/>
</bean>

The above are two common ways to send emails using Apache Commons Email and Spring Framework. In addition, there are many other Java email tool classes that can be used, such as: JavaMailSender (from Spring Boot), Java Spring Mail, Jodd Email, etc. You can choose the appropriate tool category based on your needs and preferences.

In summary, there are many options for Java email sending tools, each of which has its own characteristics and advantages. If you need more flexible operations, you can choose to use the JavaMail API; if you focus more on simplifying the development process, you can choose other tool libraries that encapsulate the JavaMail API; if you are familiar with the Spring Framework, you can directly use the email functions it provides. No matter which method you choose, it can help you quickly implement the function of sending emails in Java.

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