使用 JavaMail API 发送邮件而不使用 SSL答案

【问题标题】：Use JavaMail API to send mail without using SSL使用 JavaMail API 发送邮件而不使用 SSL
【发布时间】：2012-08-11 13:17:13
【问题描述】：

我想让我的 android 应用程序使用我的邮件服务器发送邮件，我的服务器使用端口 25，所以我的应用程序需要在没有 ssl 的情况下发送邮件。我已经尝试过这里大多数类似问题中提到的方法，但都没有奏效，因此我提出了一个新问题。以下是我读过的一些链接：
Send email in android using JavaMail API with smtp but without SSL
Sending emails over SMTP with TSL
Java Mail: SSLHandshakeException when sending email on port 25 without SSL
Javamail: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException when sending mail from VPS
Using JavaMail with TLS
http://java.sun.com/products/javamail/javamail-1.4.2/SSLNOTES142.txt

下面是我的邮件发送类：

public class MailSender extends Authenticator { 
    private String user; 
    private String password; 

    private String [] to; 
    private String from; 

    private String port; 
    private String sport; 

    private String host; 

    private String subject; 
    private String body; 

    private boolean auth; 
    private boolean debuggable; 

    private Multipart multi; 

    public MailSender(){ 
        host = "me.myserver.com"; 
        port = "25"; 
        sport = "25"; 

        user = ""; 
        password = ""; 
        from = ""; 
        subject = ""; 
        body = ""; 

        debuggable = true; 
        auth = true; 

        multi = new MimeMultipart(); 

        // There is something wrong with MailCap, javamail can not find a handler for the multipart/mixed part, so this bit needs to be added. 
        MailcapCommandMap mc = (MailcapCommandMap) CommandMap.getDefaultCommandMap();  
        mc.addMailcap("text/html;; x-java-content-handler=com.sun.mail.handlers.text_html");  
        mc.addMailcap("text/plain;; x-java-content-handler=com.sun.mail.handlers.text_plain");  
        mc.addMailcap("multipart/*;; x-java-content-handler=com.sun.mail.handlers.multipart_mixed"); 
        mc.addMailcap("message/rfc822;; x-java-content-handler=com.sun.mail.handlers.message_rfc822");  
        CommandMap.setDefaultCommandMap(mc);  
    } 

    public MailSender(String user, String password){ 
        this();       
        this.user = user; 
        this.password = password;    
    } 

    public boolean send() throws Exception { 
        Properties props = setProperties(); 

        try{ 
            Session session = Session.getInstance(props, this); 
            session.setDebug(true); 

            MimeMessage msg = new MimeMessage(session); 

            msg.setFrom(new InternetAddress(from)); 

            InternetAddress[] addressTo = new InternetAddress[to.length]; 
            for(int i=0; i<to.length; i++){ 
                addressTo[i] = new InternetAddress(to[i]); 
            } 

            msg.setRecipients(MimeMessage.RecipientType.TO, addressTo); 
            msg.setSubject(subject); 
            msg.setSentDate(new Date()); 

            BodyPart messageBodyPart = new MimeBodyPart(); 
            messageBodyPart.setText(body); 
            multi.addBodyPart(messageBodyPart); 

            msg.setContent(multi); 

            Transport transport = session.getTransport("smtps"); 
            transport.connect(host, 25, user, password); 
            transport.sendMessage(msg, msg.getAllRecipients()); 
            transport.close(); 
            return true; 
        } catch (Exception e) { 
            e.printStackTrace(); 
            return false; 
        } 
    } 

    public void addAttachment(String filename) throws Exception { 
        BodyPart messageBodyPart = new MimeBodyPart(); 
        DataSource source = new FileDataSource(filename); 
        messageBodyPart.setDataHandler(new DataHandler(source)); 
        messageBodyPart.setFileName(filename); 

        multi.addBodyPart(messageBodyPart); 
    } 

    @Override  
      public PasswordAuthentication getPasswordAuthentication() {  
        return new PasswordAuthentication(user, password);  
      } 

    private Properties setProperties() { 
        Properties props = new Properties(); 

        props.put("mail.smtp.host", host); 

        if(debuggable) { 
            props.put("mail.debug", "true"); 
        } 

        if(auth) { 
            props.put("mail.smtp.auth", "true"); 
        } 

        //props.put("mail.smtp.ssl.enable", "false");
        //props.put("mail.smtp.ssl.trust", "*");

        props.put("mail.smtp.port", port); 
        props.put("mail.smtp.socketFactory.port", sport); 
        //props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
        //props.put("mail.smtp.socketFactory.fallback", "true"); 
        props.setProperty("mail.smtp.ssl.enable", "true");
        props.setProperty("mail.smtp.ssl.socketFactory.class",
                        "DummySSLSocketFactory");
        props.setProperty("mail.smtp.ssl.socketFactory.fallback", "false");

        //props.put("mail.smtp.starttls.enable", "false");

        return props; 
    } 

    public void setTo(String[] toAddress) { 
        this.to = toAddress; 
    } 

    public void setFrom(String fromAddress) { 
        this.from = fromAddress; 
    } 

    public void setSubject(String subject) { 
        this.subject = subject; 
    } 

    public void setBody(String body) {  
        this.body = body;  
    } 
}

DummySSLSocketFactory.java：

public class DummySSLSocketFactory extends SSLSocketFactory {
    private SSLSocketFactory factory;

    public DummySSLSocketFactory() {
    try {
        SSLContext sslcontext = SSLContext.getInstance("TLS");
        sslcontext.init(null,
                 new TrustManager[] { new DummyTrustManager()},
                 null);
        factory = (SSLSocketFactory)sslcontext.getSocketFactory();
    } catch(Exception ex) {
        // ignore
    }
    }

    public static SocketFactory getDefault() {
    return new DummySSLSocketFactory();
    }

    public Socket createSocket() throws IOException {
    return factory.createSocket();
    }

    public Socket createSocket(Socket socket, String s, int i, boolean flag)
                throws IOException {
    return factory.createSocket(socket, s, i, flag);
    }

    public Socket createSocket(InetAddress inaddr, int i,
                InetAddress inaddr1, int j) throws IOException {
    return factory.createSocket(inaddr, i, inaddr1, j);
    }

    public Socket createSocket(InetAddress inaddr, int i)
                throws IOException {
    return factory.createSocket(inaddr, i);
    }

    public Socket createSocket(String s, int i, InetAddress inaddr, int j)
                throws IOException {
    return factory.createSocket(s, i, inaddr, j);
    }

    public Socket createSocket(String s, int i) throws IOException {
    return factory.createSocket(s, i);
    }

    public String[] getDefaultCipherSuites() {
    return factory.getDefaultCipherSuites();
    }

    public String[] getSupportedCipherSuites() {
    return factory.getSupportedCipherSuites();
    }
}

DummyTrustManager.java：

public class DummyTrustManager implements X509TrustManager {
    public void checkClientTrusted(X509Certificate[] cert, String authType) {
    // everything is trusted
    }

    public void checkServerTrusted(X509Certificate[] cert, String authType) {
    // everything is trusted
    }

    public X509Certificate[] getAcceptedIssuers() {
    return new X509Certificate[0];
    }
}

日志中的错误消息：

08-15 16:08:59.338: W/System.err(16163): javax.mail.MessagingException: Could not connect to SMTP host: me.myserver.com, port: 25;
08-15 16:08:59.338: W/System.err(16163):   nested exception is:
08-15 16:08:59.338: W/System.err(16163):    javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x5bfaf480: Failure in SSL library, usually a protocol error
08-15 16:08:59.338: W/System.err(16163): error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol (external/openssl/ssl/s23_clnt.c:766 0x580b87de:0x00000000)
08-15 16:08:59.338: W/System.err(16163):    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1391)
08-15 16:08:59.338: W/System.err(16163):    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:412)
08-15 16:08:59.346: W/System.err(16163):    at javax.mail.Service.connect(Service.java:288)
08-15 16:08:59.346: W/System.err(16163):    at Android.sender.MailSender.send(MailSender.java:100)
08-15 16:08:59.346: W/System.err(16163):    at Android.sender.Sender$SendMail.doInBackground(Sender.java:73)
08-15 16:08:59.346: W/System.err(16163):    at Android.sender.Sender$SendMail.doInBackground(Sender.java:1)
08-15 16:08:59.354: W/System.err(16163):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
08-15 16:08:59.354: W/System.err(16163):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-15 16:08:59.354: W/System.err(16163):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-15 16:08:59.354: W/System.err(16163):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
08-15 16:08:59.354: W/System.err(16163):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-15 16:08:59.354: W/System.err(16163):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-15 16:08:59.354: W/System.err(16163):    at java.lang.Thread.run(Thread.java:856)
08-15 16:08:59.354: W/System.err(16163): Caused by: javax.net.ssl.SSLHandshakeException: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x5bfaf480: Failure in SSL library, usually a protocol error
08-15 16:08:59.354: W/System.err(16163): error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol (external/openssl/ssl/s23_clnt.c:766 0x580b87de:0x00000000)
08-15 16:08:59.362: W/System.err(16163):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:436)
08-15 16:08:59.362: W/System.err(16163):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl$SSLInputStream.<init>(OpenSSLSocketImpl.java:647)
08-15 16:08:59.362: W/System.err(16163):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.getInputStream(OpenSSLSocketImpl.java:618)
08-15 16:08:59.362: W/System.err(16163):    at com.sun.mail.smtp.SMTPTransport.initStreams(SMTPTransport.java:1449)
08-15 16:08:59.362: W/System.err(16163):    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1366)
08-15 16:08:59.362: W/System.err(16163):    ... 12 more
08-15 16:08:59.362: W/System.err(16163): Caused by: javax.net.ssl.SSLProtocolException: SSL handshake aborted: ssl=0x5bfaf480: Failure in SSL library, usually a protocol error
08-15 16:08:59.362: W/System.err(16163): error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol (external/openssl/ssl/s23_clnt.c:766 0x580b87de:0x00000000)
08-15 16:08:59.362: W/System.err(16163):    at org.apache.harmony.xnet.provider.jsse.NativeCrypto.SSL_do_handshake(Native Method)
08-15 16:08:59.362: W/System.err(16163):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:395)
08-15 16:08:59.362: W/System.err(16163):    ... 16 more

这里我改了“Transport transport = session.getTransport("smtps");”改为“Transport transport = session.getTransport("smtps");”，错误日志中的消息发生了变化。

08-15 17:18:13.986: W/System.err(21399): javax.mail.MessagingException: Could not convert socket to TLS;
08-15 17:18:13.986: W/System.err(21399):   nested exception is:
08-15 17:18:13.986: W/System.err(21399):    javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
08-15 17:18:13.986: W/System.err(21399):    at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1339)
08-15 17:18:13.986: W/System.err(21399):    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:420)
08-15 17:18:13.986: W/System.err(21399):    at javax.mail.Service.connect(Service.java:288)
08-15 17:18:13.986: W/System.err(21399):    at Android.sender.MailSender.send(MailSender.java:100)
08-15 17:18:13.986: W/System.err(21399):    at Android.sender.Sender$SendMail.doInBackground(Sender.java:73)
08-15 17:18:13.986: W/System.err(21399):    at Android.sender.Sender$SendMail.doInBackground(Sender.java:1)
08-15 17:18:13.986: W/System.err(21399):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
08-15 17:18:13.986: W/System.err(21399):    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-15 17:18:13.986: W/System.err(21399):    at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-15 17:18:13.986: W/System.err(21399):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
08-15 17:18:13.986: W/System.err(21399):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
08-15 17:18:13.986: W/System.err(21399):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
08-15 17:18:13.986: W/System.err(21399):    at java.lang.Thread.run(Thread.java:856)
08-15 17:18:13.986: W/System.err(21399): Caused by: javax.net.ssl.SSLHandshakeException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
08-15 17:18:13.986: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:398)
08-15 17:18:13.986: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl$SSLInputStream.<init>(OpenSSLSocketImpl.java:647)
08-15 17:18:13.986: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.getInputStream(OpenSSLSocketImpl.java:618)
08-15 17:18:13.986: W/System.err(21399):    at com.sun.mail.smtp.SMTPTransport.initStreams(SMTPTransport.java:1449)
08-15 17:18:13.986: W/System.err(21399):    at com.sun.mail.smtp.SMTPTransport.startTLS(SMTPTransport.java:1336)
08-15 17:18:13.986: W/System.err(21399):    ... 12 more
08-15 17:18:13.986: W/System.err(21399): Caused by: java.security.cert.CertificateException: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
08-15 17:18:13.986: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.TrustManagerImpl.checkTrusted(TrustManagerImpl.java:192)
08-15 17:18:13.994: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.TrustManagerImpl.checkServerTrusted(TrustManagerImpl.java:163)
08-15 17:18:13.994: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.verifyCertificateChain(OpenSSLSocketImpl.java:597)
08-15 17:18:13.994: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.NativeCrypto.SSL_do_handshake(Native Method)
08-15 17:18:13.994: W/System.err(21399):    at org.apache.harmony.xnet.provider.jsse.OpenSSLSocketImpl.startHandshake(OpenSSLSocketImpl.java:395)
08-15 17:18:13.994: W/System.err(21399):    ... 16 more
08-15 17:18:13.994: W/System.err(21399): Caused by: java.security.cert.CertPathValidatorException: Trust anchor for certification path not found.
08-15 17:18:13.994: W/System.err(21399):    ... 21 more

【问题讨论】：

您确实意识到您的 mail.smtp.starttls.enable 属性在应该为 true 时设置为 false？
所以我隐藏了这条线，它不是默认为true吗？我还想问，我的问题需要自我证明吗？因为我读过这个页面，但不太明白如何在我的程序中使用代码块。 stackoverflow.com/questions/1217141/…
我已经添加了这两行，但仍然发生同样的错误，我无法禁用 ssl。 props.put("mail.smtp.ssl.enable", "false"); props.put("mail.smtp.starttls.enable", "true");
您是否尝试过这里的建议：stackoverflow.com/questions/5592112/…
我认为在我添加回这两行之后，那里显示的那个与我的完全一样，但是，它不起作用。正如我提到的，我不知道为什么 props.put("mail.smtp.ssl.enable", "false");无法禁用 ssl。

标签： java android exception smtp jakarta-mail

【解决方案1】：

这似乎与您的另一个线程重复：SSLException in using JavaMail API，尽管您似乎确实想要使用 SSL。

如果你不想使用 SSL，为什么还要有 DummySSLSocketFactory 和 DummyTrustManager？完全摆脱它们并使用“smtp”协议，而不是“smtps”协议。而且，正如我在您的其他线程中解释的那样，您根本不需要任何套接字工厂属性，即使您使用的是 SSL。

您没有说是否要使用 STARTTLS，即是否要使用纯文本（非 SSL）连接连接到您的邮件服务器，然后将连接切换到 SSL。如果您想这样做，请将 mail.smtp.starttls.enable 属性设置为 true。

【讨论】：

是的，我认为它们在某个地方重复了。因为一个是旧的，它正在使用当前的。因为我是初学者，所以我只是尝试了网上提到的不同方法，因为我实际上想做的只是连接到我的邮件服务器的25端口。最后我试了一下答案，和你说的一模一样，应该是“smtp”而不是“smtps”
您是否找到了 JavaMail 常见问题解答以及 JavaMail 中包含的所有示例代码？
我只是阅读了其他问题或其他人提到的网站上发布的示例代码，所以当我需要调试这种小规模错误时给我带来了麻烦。
我不是在谈论人们在此处或其他网站上发布的随机且通常不正确的代码。我说的是下载 JavaMail 时包含在 JavaMail zip 文件中的示例代码。
我没有读过它，因为我也没有下载JavaMail。我知道这可能会给我带来很多麻烦，所以我会努力改掉这个坏习惯，谢谢你的建议！