发送电子邮件时出错:找不到提供商 com.sun.mail.imap.IMAPProvider
Error sending an email: Provider com.sun.mail.imap.IMAPProvider not found
我正在使用 javamail 通过 gmail 帐户发送 html 电子邮件。它在我的 Android 模拟器上的应用程序中运行良好,但是当我在 Android 9 设备上安装我的应用程序并尝试发送电子邮件时,我收到此错误:
d.b.o.: Provider com.sun.mail.imap.IMAPProvider not found
这是我使用的class:
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.StrictMode;
import android.text.Html;
import android.text.Spanned;
import android.util.Log;
import androidx.core.text.HtmlCompat;
import java.util.ArrayList;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendHTMLEmail {
public static boolean SendEmail(String dst, String subject, String body) {
final String cemail;
final String cpasswd;
cemail= "mygmail@gmail.com";
cpasswd= "mypassword";
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.googlemail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
try {
Session session = Session.getDefaultInstance(props, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(cemail, cpasswd);
}
});
if (session != null) {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(cemail));
message.setSubject(subject);
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(dst));
message.setContent(body, "text/html; charset=utf-8");
Transport.send(message);
return true;
}
} catch (Exception e) {
e.printStackTrace();
Log.e("EMAIL", e.getMessage());
}
return false;
}
}
经过一些测试和修改后,我发现了错误:
java.lang.ClassNotFoundException: com.sun.mail.imap.IMAPProvider
Caused by: java.lang.ClassNotFoundException: com.sun.mail.pop3.POP3Provider
问题是 ProGuard 规则。可以这样解决:
我正在使用 javamail 通过 gmail 帐户发送 html 电子邮件。它在我的 Android 模拟器上的应用程序中运行良好,但是当我在 Android 9 设备上安装我的应用程序并尝试发送电子邮件时,我收到此错误:
d.b.o.: Provider com.sun.mail.imap.IMAPProvider not found
这是我使用的class:
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.StrictMode;
import android.text.Html;
import android.text.Spanned;
import android.util.Log;
import androidx.core.text.HtmlCompat;
import java.util.ArrayList;
import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendHTMLEmail {
public static boolean SendEmail(String dst, String subject, String body) {
final String cemail;
final String cpasswd;
cemail= "mygmail@gmail.com";
cpasswd= "mypassword";
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
Properties props = new Properties();
props.put("mail.smtp.host", "smtp.googlemail.com");
props.put("mail.smtp.socketFactory.port", "465");
props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
props.put("mail.smtp.auth", "true");
props.put("mail.smtp.port", "465");
try {
Session session = Session.getDefaultInstance(props, new Authenticator() {
@Override
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication(cemail, cpasswd);
}
});
if (session != null) {
Message message = new MimeMessage(session);
message.setFrom(new InternetAddress(cemail));
message.setSubject(subject);
message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(dst));
message.setContent(body, "text/html; charset=utf-8");
Transport.send(message);
return true;
}
} catch (Exception e) {
e.printStackTrace();
Log.e("EMAIL", e.getMessage());
}
return false;
}
}
经过一些测试和修改后,我发现了错误:
java.lang.ClassNotFoundException: com.sun.mail.imap.IMAPProvider Caused by: java.lang.ClassNotFoundException: com.sun.mail.pop3.POP3Provider
问题是 ProGuard 规则。可以这样解决: