Java.lang.NoClassDefFoundError-JavaMail
我的主活动中有一个线程,它将创建类Java.lang.NoClassDefFoundError-JavaMail,java,android,Java,Android,我的主活动中有一个线程,它将创建类SendMail package Logic; import java.util.Date; import java.util.Properties; import javax.activation.DataHandler; import javax.activation.FileDataSource; import javax.mail.Message; import javax.mail.MessagingException; import javax.
SendMail
package Logic;
import java.util.Date;
import java.util.Properties;
import javax.activation.DataHandler;
import javax.activation.FileDataSource;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Multipart;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.AddressException;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeBodyPart;
import javax.mail.internet.MimeMessage;
import javax.mail.internet.MimeMultipart;
import android.util.Log;
public class SendMail {
String from;
String to;
String subject;
String bodyText;
String fileName;
public SendMail(String to, String fileName, String PCN) {
this.to = to;
this.fileName = fileName;
this.from = "Hello@gmail.com";
this.bodyText = "FILE";
this.subject = PCN;
}
public void sendMailWithAttatchment() {
Properties properties = new Properties();
properties.put("mail.smtp.host", "IP_ADDRESS");
properties.put("mail.smtp.port", "25");
Session session = Session.getDefaultInstance(properties, null);
MimeMessage message = new MimeMessage(session);
try {
message.setFrom(new InternetAddress(from));
message.setRecipient(Message.RecipientType.TO, new InternetAddress(
to));
message.setSubject(subject);
message.setSentDate(new Date());
MimeBodyPart messagePart = new MimeBodyPart();
messagePart.setText(bodyText);
MimeBodyPart attachmentPart = new MimeBodyPart();
FileDataSource fileDataSource = new FileDataSource(fileName) {
@Override
public String getContentType() {
return "application/octet-stream";
}
};
attachmentPart.setDataHandler(new DataHandler(fileDataSource));
attachmentPart.setFileName(fileDataSource.getName());
Multipart multipart = new MimeMultipart();
multipart.addBodyPart(messagePart);
multipart.addBodyPart(attachmentPart);
message.setContent(multipart);
Transport.send(message);
} catch (AddressException e) {
Log.e("ADDRESS_EXCEPTION: ", e.getMessage());
} catch (MessagingException e) {
Log.e("MESSAGING_EXCEPTION: ", e.getMessage());
}
}
}
但是编译器抛出一个异常:“Java.lang.NoClassDefFoundError”。javax.activation.Datahandler
我已经读过这个线程:.jar文件
javamail.jar
和javax.activation.jar
位于我的libs
文件夹下,但是即使我清理了项目,这也会引发异常
有什么想法吗
以下是引发的异常:
08-07 10:19:49.870: E/AndroidRuntime(17736): java.lang.NoClassDefFoundError: javax.activation.DataHandler
08-07 10:19:49.870: E/AndroidRuntime(17736): at javax.mail.internet.MimeBodyPart.setContent(MimeBodyPart.java:647)
08-07 10:19:49.870: E/AndroidRuntime(17736): at javax.mail.internet.MimeBodyPart.setText(MimeBodyPart.java:892)
08-07 10:19:49.870: E/AndroidRuntime(17736): at javax.mail.internet.MimeBodyPart.setText(MimeBodyPart.java:680)
08-07 10:19:49.870: E/AndroidRuntime(17736): at javax.mail.internet.MimeBodyPart.setText(MimeBodyPart.java:668)
08-07 10:19:49.870: E/AndroidRuntime(17736): at sendMailWithAttatchment(SendMail.java:56)
08-07 10:19:49.870: E/AndroidRuntime(17736): at sendMailWithAttatchment(SendMail.java:56)
08-07 10:19:49.870: E/AndroidRuntime(17736): at CreateNistFile(MyActivity.java:530)
是的,这是因为你的.jar文件没有正确导入。只要遵循我现有的原则,它肯定会对你有所帮助。下面的快照很重要(它通知其他jar文件应该与此图像类似)-
重要的一点是,每当您想
Java.lang.NoClassDefFoundError
exception时,上面一个异常就是处理这个问题的解决方案。如果您使用的是eclipse,右键单击项目>选择属性>Java构建路径>库>添加JAR并添加JAR。然后清理项目Android不完全兼容Java,有一个javamail Android项目将javamail支持添加到Android应用程序中
确保您从这里下载并添加到构建路径所有3个JAR:java为android引入javaMail的新方式: 您只需在gradle中添加这些行:
android {
packagingOptions {
pickFirst 'META-INF/LICENSE.txt' // picks the JavaMail license file
}
}
repositories {
jcenter()
maven {
url "https://maven.java.net/content/groups/public/"
}
}
dependencies {
compile 'com.sun.mail:android-mail:1.5.5'
compile 'com.sun.mail:android-activation:1.5.5'
}
并且像你一样发送smtp邮件。。。
祝你好运。我已经做到了,事实上这不是我想要的。你的答案太明显了。@TobiasMoeThorstensen大部分时间都能解决我的问题,所以我只是想帮忙。没问题。谢谢你的回答,但这对我不起作用。在抛出异常之前,我得到了以下调试信息:解析Ljavax/activation/DataHandler失败;接口272'Ljava/awt/datatransfer/Transferable;'你是不是在说不,我遵循这个教程:我不想在手机上有任何用户交互,也不想有任何已安装电子邮件客户端的弹出窗口。邮件应包含主题、正文和附件。现在,在出现异常后,您可以发布完整的
LogCat
跟踪吗?@TobiasMoeThorstensen是的,.jar
文件没有正确导入。你试过我现有的答案了吗。