Question

我试图从我的java发送电子邮件，但我无法连接到我的主机。这是我的代码：

public class sendEmail implements Runnable{
     @Override
     public void run(){
        try{
            final String username = "user", password = "pass", from = "from@mail.com", to = "to@mail.com";

            Properties props = new Properties();
            props.setProperty("mail.smtp.user", username);
            props.setProperty("mail.smtp.host", "mail.host.com");
            props.setProperty("mail.smtp.ssl.enable", "true"); 
            props.setProperty("mail.smtp.port", "465");
            props.setProperty("mail.smtp.starttls.enable", "true");
            props.setProperty("mail.smtp.debug", "true");
            props.setProperty("mail.smtp.auth", "true");
            props.setProperty("mail.smtp.socketFactory.port", "465");
            props.setProperty("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory");
            props.setProperty("mail.smtp.socketFactory.fallback", "false");
            Authenticator auth = new SMTPAuthenticator();
            Session session = Session.getInstance(props, auth);
            session.setDebug(true);

            Message msg = new MimeMessage(session);
            try{
                msg.setSubject("Test SMTP");
                msg.setFrom(new InternetAddress(from));
                msg.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
                Transport transport = session.getTransport("smtp");
                transport.connect("mail.itbuntuksemua.com", username, password);
                transport.sendMessage(msg, msg.getAllRecipients());
                transport.close();
                System.out.println("Done");
            }catch(MessagingException | NumberFormatException | HeadlessException ex){
                ex.printStackTrace();
            }
        }catch(UnknownHostException | NumberFormatException ex){
            ex.printStackTrace();
        }
     }
 }

这里是我的SMTPAuthenticator()代码：

private class SMTPAuthenticator extends javax.mail.Authenticator {
    @Override
    public PasswordAuthentication getPasswordAuthentication() {
        String username = "user"; 
        String password = "pass";
        return new PasswordAuthentication(username, password);
    } 
}

再次，我的报告错误：

DEBUG：setDebug：JavaMail 1.4.7版 DEBUG：getProvider（）返回javax.mail.Provider [TRANSPORT，smtp，com.sun.mail.smtp.SMTPTransport，Oracle] DEBUG SMTP：useEhlo true，useAuth true DEBUG SMTP：尝试连接到主机＆＃34; mail.host.com＆＃34;，端口465，isSSL true javax.mail.MessagingException：无法连接到SMTP主机：mail.host.com，port：465; 嵌套异常是： javax.net.ssl.SSLHandshakeException：sun.security.validator.ValidatorException：PKIX路径构建失败：sun.security.provider.certpath.SunCertPathBuilderException：无法找到所请求目标的有效证书路径 at com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:1961） at com.sun.mail.smtp.SMTPTransport.protocolConnect（SMTPTransport.java:654）在javax.mail.Service.connect（Service.java:295）在javax.mail.Service.connect（Service.java:176）在scam.ccChecker $ sendEmail.run（ccChecker.java:186）在java.lang.Thread.run（Thread.java:745）引起：javax.net.ssl.SSLHandshakeException：sun.security.validator.ValidatorException：PKIX路径构建失败：sun.security.provider.certpath.SunCertPathBuilderException：无法找到所请求目标的有效证书路径 at sun.security.ssl.Alerts.getSSLException（Alerts.java:192） at sun.security.ssl.SSLSocketImpl.fatal（SSLSocketImpl.java:1937）在sun.security.ssl.Handshaker.fatalSE（Handshaker.java:302）在sun.security.ssl.Handshaker.fatalSE（Handshaker.java:296） at sun.security.ssl.ClientHandshaker.serverCertificate（ClientHandshaker.java:1478）在sun.security.ssl.ClientHandshaker.processMessage（ClientHandshaker.java:212）在sun.security.ssl.Handshaker.processLoop（Handshaker.java:957）在sun.security.ssl.Handshaker.process_record（Handshaker.java:892） at sun.security.ssl.SSLSocketImpl.readRecord（SSLSocketImpl.java:1050） at sun.security.ssl.SSLSocketImpl.performInitialHandshake（SSLSocketImpl.java:1363） at sun.security.ssl.SSLSocketImpl.startHandshake（SSLSocketImpl.java:1391） at sun.security.ssl.SSLSocketImpl.startHandshake（SSLSocketImpl.java:1375） at com.sun.mail.util.SocketFetcher.configureSSLSocket（SocketFetcher.java:549） at com.sun.mail.util.SocketFetcher.createSocket（SocketFetcher.java:354）在com.sun.mail.util.SocketFetcher.getSocket（SocketFetcher.java:211）在com.sun.mail.smtp.SMTPTransport.openServer（SMTPTransport.java:1927） ......还有5个引发者：sun.security.validator.ValidatorException：PKIX路径构建失败：sun.security.provider.certpath.SunCertPathBuilderException：无法找到所请求目标的有效证书路径 at sun.security.validator.PKIXValidator.doBuild（PKIXValidator.java:387） at sun.security.validator.PKIXValidator.engineValidate（PKIXValidator.java:292） at sun.security.validator.Validator.validate（Validator.java:260） at sun.security.ssl.X509TrustManagerImpl.validate（X509TrustManagerImpl.java:324） at sun.security.ssl.X509TrustManagerImpl.checkTrusted（X509TrustManagerImpl.java:229） at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted（X509TrustManagerImpl.java:124） at sun.security.ssl.ClientHandshaker.serverCertificate（ClientHandshaker.java:1460） ......还有16个引起：sun.security.provider.certpath.SunCertPathBuilderException：无法找到请求目标的有效证书路径在sun.security.provider.certpath.SunCertPathBuilder.build（SunCertPathBuilder.java:145） at sun.security.provider.certpath.SunCertPathBuilder.engineBuild（SunCertPathBuilder.java:131）在java.security.cert.CertPathBuilder.build（CertPathBuilder.java:280） at sun.security.validator.PKIXValidator.doBuild（PKIXValidator.java:382） ......还有22个

有人能帮帮我吗？：（

Answer 1

您可能想尝试下载证书，使用keytool安装它，然后将它们设置为系统变量。以下是：

转到firefox浏览器中的URL，单击HTTPS证书链（URL地址旁边）。点击<!DOCTYPE html> <html> <head> <title>D3.xml Example</title> <script type="text/javascript" src="http://mbostock.github.com/d3/d3.v2.js"></script> <style type="text/css"> .chart div { font: 10px sans-serif; background-color: steelblue; text-align: right; padding: 3px; margin: 1px; color: white; display:inline-block; width:30px; } .howard { background-color: red; } </style </head> <body> <div id="chart" class="chart"> </div> <script> d3.xml("updatedphillies.xml", "application/xml", function(xml) { d3.select("#chart") .selectAll("div") .data(xml.documentElement.getElementsByTagName("doubles")) .enter().append("div") .style("height", function(d) { return d.textContent * 1 + 10 + "px"; }) .text(function(d) { return d.textContent; }); console.log(xml.documentElement.getElementsByTagName("player")); }); </script> </body> </html>。选取名称并选择文件类型"more info" > "security" > "show certificate" > "details" > "export.."。现在你有了keystore的文件，你必须将它添加到你的JVM
找到文件example.der
使用以下内容将$JAVA_HOME/jre/lib/security/cacerts文件导入example.der文件：
```
cacerts
```
默认密钥库密码为＆＃39; sudo keytool -import -alias example -keystore $JAVA_HOME/jre/lib/security/cacerts -file example.der＆＃39;
您可以使用显示证书指纹的此命令查看您所做的更改。
```
changeit
```
如果这不能解决问题，请尝试将这些java选项添加为参数：
```
keytool -list -keystore cacerts
```

或者您可以将它们作为系统变量放入java代码中：

-Djavax.net.ssl.trustStore="$JAVA_HOME/jre/lib/security/cacerts"
-Djavax.net.ssl.trustStorePassword="changeit"

可以在此处找到更多说明：https://stackoverflow.com/a/36427118/1696153

Answer 2

也许您可以尝试设置证书，以访问SMTP端口。这样的事情：

System.setProperty("javax.net.ssl.trustStore","key");
System.setProperty("javax.net.ssl.trustStorePassword","password");

Javamail - 无法连接到SMTP主机

2 个答案: