javamail下面ssl方式发送邮件

网上很多人使用如下方式 Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider()); final String SSL_FACTORY = "javax.net.ssl.SSLSocketFactory"; Properties props = System.getProperties(); props.setProperty("mail.smtp.host", "smtp.gmail.com"); props.setProperty("mail.smtp.socketFactory.class", SSL_FACTORY); props.setProperty("mail.smtp.socketFactory.fallback", "false"); props.setProperty("mail.smtp.port", "994"); props.setProperty("mail.smtp.socketFactory.port", "994"); props.put("mail.smtp.auth", "true"); props.put("mail.transport.protocol", "smtp"); props.put("mail.smtp.starttls.enable","true"); 会报错javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderExcept ion: unable to find valid certification path to requested target 错误很简单，就是证书路径无效，网上有人说使用代码下载证书到本地jre证书库中，或者直接导入此证书到jre证书；确实可以；但是我们可以在代码中信任此站点证书，避免了需要下载证书,代码如下，就OK了 Properties props = System.getProperties(); props.setProperty("mail.smtp.host", "smtp.gmail.com"); props.setProperty("mail.smtp.port", "994"); props.put("mail.smtp.auth", "true"); // 允许smtp校验 MailSSLSocketFactory sf = null; try {     sf = new MailSSLSocketFactory(); } catch (GeneralSecurityException e) {     logger.fatal("error", e); } sf.setTrustAllHosts(true); props.put("mail.smtp.ssl.enable", "true"); props.put("mail.smtp.ssl.socketFactory", sf); props.put("mail.smtp.socketFactory.fallback", "false"); props.put("mail.smtp.socketFactory.port",   "994");