Tomcat类装载器
context.xml：<Context>
<Resource name="mail/session"
auth="Container"
type="javax.mail.Session"
mail.smtp.host="smtp.sina.com.cn"
mail.transport.protocol="smtp"
mail.smtp.auth="true"/>
</Context>
MailServlet.java：
Context initCtx = new InitialContext();
Context envCtx = (Context) initCtx.lookup("java:comp/env");
Session session = (Session) envCtx.lookup("mail/Session");
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