javamail怎么设置代理发送邮件

使用JavaMail设置代理发送邮件需要进行以下步骤：

1. 创建Properties对象，设置代理主机和端口号：

Properties props = new Properties();
props.setProperty("proxySet", "true");
props.setProperty("socksProxyHost", "代理主机");
props.setProperty("socksProxyPort", "代理端口");

2. 创建Session对象，传入Properties对象：

Session session = Session.getInstance(props);

3. 创建Transport对象，连接SMTP服务器：

Transport transport = session.getTransport("smtp");
transport.connect("SMTP服务器地址", "SMTP用户名", "SMTP密码");

4. 创建Message对象，设置邮件内容：

Message message = new MimeMessage(session);
message.setFrom(new InternetAddress("发件人邮箱"));
message.setRecipient(Message.RecipientType.TO, new InternetAddress("收件人邮箱"));
message.setSubject("邮件主题");
message.setText("邮件内容");

5. 发送邮件：

transport.sendMessage(message, message.getAllRecipients());

完整代码示例：

import java.util.Properties;
import javax.mail.*;
import javax.mail.internet.*;

public class SendMail {
    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        props.setProperty("proxySet", "true");
        props.setProperty("socksProxyHost", "代理主机");
        props.setProperty("socksProxyPort", "代理端口");

        Session session = Session.getInstance(props);

        Transport transport = session.getTransport("smtp");
        transport.connect("SMTP服务器地址", "SMTP用户名", "SMTP密码");

        Message message = new MimeMessage(session);
        message.setFrom(new InternetAddress("发件人邮箱"));
        message.setRecipient(Message.RecipientType.TO, new InternetAddress("收件人邮箱"));
        message.setSubject("邮件主题");
        message.setText("邮件内容");

        transport.sendMessage(message, message.getAllRecipients());

        transport.close();
    }
}

需要注意的是，代理主机和端口号需要根据实际情况进行设置。