[Java] JavaMail 查询邮件
上两篇提到如何发送邮件:JavaMail 发送 html 格式、带附件的邮件, JavaMail 简单案例。本文再演示下,如何读取邮箱上的邮件。
邮件内容的数据格式种类比较多,用户直接阅读邮件比较常见,通过程序解读邮件比较少见,所以,本文的例子只演示读取邮件信封上的内容,例如邮件主题、发件人。若邮件内容是纯文本格式,也能直接读取。若邮件内容是非文本格式,可以通过分解获取到的 Message 继续解读,不过这种情况不在本文演示范围内。
CheckingMail, 查询邮件,根据提供的 pop3 服务器域名,邮箱账号,密码,查询该邮箱账号里面的邮件。只查看邮件主题,发件人,邮件内容类型,如果是纯文本内容,也会显示出现。注意点:如果 InternetAddress 的 personName 包含中文,直接调用 InternetAddress.toString() 会显示不正常,需要单独调用 InternetAddress 的 getPersonal() 提取发件人姓名,才能正常显示发件人姓名。
CheckingMailDemo, 演示邮件查询。
具体代码:
CheckingMail, 查询邮件。
import static java.lang.System.out; import java.util.Properties; import javax.mail.Address; import javax.mail.Folder; import javax.mail.Message; import javax.mail.PasswordAuthentication; import javax.mail.Session; import javax.mail.Store; import javax.mail.internet.InternetAddress; public class CheckingMail { private String username; private String password; private String host; private String port = "995"; public CheckingMail(String host, String username, String password){ this.host = host; this.username = username; this.password = password; } public void check() throws Exception{ Properties props = new Properties(); props.put("mail.pop3.host", host); props.put("mail.pop3.port", port); props.put("mail.pop3.stattls.enable", "true"); Session session = Session.getInstance(props, new javax.mail.Authenticator(){ protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication(username, password); } }); Store store = session.getStore("pop3s"); store.connect(host, username, password); System.out.println(" connect completed "); Folder folder = store.getFolder("INBOX"); folder.open(Folder.READ_ONLY); Message[] messages = folder.getMessages(); System.out.println(" the number of message retrieved from mailbox : " + messages.length); for (int i = 0 ; i < messages.length; i++){ Message msg = messages[i]; InternetAddress address = (InternetAddress) msg.getFrom()[0]; out.println(" [ #" + i + " ] "); out.println( "Subject : " + msg.getSubject()); out.println("From : " + address.getPersonal() + "<" + address.getAddress() + ">"); out.println("ContentType : " + msg.getContentType()); out.println("Content Detail : " + msg.getContent().toString()); out.println(); } out.println(" Eamil retrieved completely "); folder.close(false); store.close(); } }
CheckingMailDemo, 演示邮件查询。
public class CheckingMailDemo { public static void main() { try { String host = "pop.163.com"; final String username = "yourUserName@163.com"; final String password = "yourPassword"; CheckingMail checkingMail = new CheckingMail(host, username, password); checkingMail.check(); } catch (Exception e) { e.printStackTrace(); } } }
参考资料