java收取邮件附件保存到本地

以下是Java保存邮件附件到本地的示例代码：

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;
import javax.mail.BodyPart;
import javax.mail.Folder;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Store;

public class SaveEmailAttachments {

    public static void main(String[] args) throws MessagingException, IOException {
        // 邮箱相关信息
        String host = "imap.gmail.com";
        String username = "your-email-address";
        String password = "your-email-password";

        // 连接到IMAP服务器
        Properties properties = new Properties();
        properties.put("mail.imap.host", host);
        properties.put("mail.imap.port", "993");
        properties.put("mail.imap.ssl.enable", "true");
        Session session = Session.getDefaultInstance(properties);
        Store store = session.getStore("imaps");
        store.connect(host, username, password);

        // 打开收件箱
        Folder inbox = store.getFolder("INBOX");
        inbox.open(Folder.READ_ONLY);

        // 遍历邮件消息并保存附件
        Message[] messages = inbox.getMessages();
        for (Message message : messages) {
            Multipart multipart = (Multipart) message.getContent();
            for (int i = 0; i < multipart.getCount(); i++) {
                BodyPart bodyPart = multipart.getBodyPart(i);
                if (!Part.ATTACHMENT.equalsIgnoreCase(bodyPart.getDisposition())) {
                    continue;
                }
                String fileName = bodyPart.getFileName();
                InputStream inputStream = bodyPart.getInputStream();
                FileOutputStream outputStream = new FileOutputStream(fileName);
                byte[] buffer = new byte[1024];
                int bytesRead;
                while ((bytesRead = inputStream.read(buffer)) != -1) {
                    outputStream.write(buffer, 0, bytesRead);
                }
                outputStream.close();
                inputStream.close();
            }
        }

        // 关闭收件箱和邮箱连接
        inbox.close(false);
        store.close();
    }
}

这个示例程序假设你已经连接到IMAP服务器并打开了收件箱。它遍历了每个消息，并从每个消息中提取出附件。对于每个附件，它获取文件名和InputStream，然后将数据写入本地文件。当遍历所有消息并保存附件完成后，它关闭收件箱，并断开与IMAP服务器的连接。