（更新）Java + 腾讯企业邮箱 + javamail + SSL 发送邮件

咳咳~最头疼的就是莫名其妙的错误。

本来今年6月份运行通过的代码，过俩月就报错了。

 1 javax.mail.MessagingException: Could not connect to SMTP host: smtp.exmail.qq.com, port: 465;  
 2   nested exception is:  
 3     javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure  
 4     at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2102)  
 5     at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:699)  
 6     at javax.mail.Service.connect(Service.java:388)  
 7     at javax.mail.Service.connect(Service.java:246)  
 8     at javax.mail.Service.connect(Service.java:195)  
 9     at javax.mail.Transport.send0(Transport.java:254)  
10     at javax.mail.Transport.send(Transport.java:124)  
11     at com.genepoint.tool.EmailUtil$2.run(EmailUtil.java:78)  
12 Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure  
13     at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)  
14     at sun.security.ssl.Alerts.getSSLException(Alerts.java:154)  
15     at sun.security.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:2023)  
16     at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1125)  
17     at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1375)  
18     at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1403)  
19     at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1387)  
20     at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:598)  
21     at com.sun.mail.util.SocketFetcher.createSocket(SocketFetcher.java:372)  
22     at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238)  
23     at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:2066)  
24     ... 7 more

经过在网上查阅得知，腾讯修改了邮箱的加密方式，一种方法呢比较简单。

官方jce

JCE 即 Java 加密扩展（JCE, Java Cryptography Extension），是一组提供加密、密钥生成、密码协议和消息认证码（MAC, Message Authentication Code）算法的框架和接口包，支持包括对称密码、不对称密码、分组密码、流密码。该软件还支持安全流和密封对象。

Java8影响邮件发送解决办法：

对应我的 Java 8 的版本，下载 JCE ，解压并将其中的两个 jar 包： local_policy.jar ， US_export_policy.jar 复制到 %JAVA_HOME%\jre\lib\security 即可。