jetty-server-8.1.8.jar 中包含：jetty-8.1.8发行版"/lib"目录下所有jetty模块jar包、servlet-api-3.0.jar、"/lib/jsp"下的 com.sun.el-2.2.0.v201108011116.jar、javax.el-2.2.0.v201108011116.jar、javax.servlet.jsp-2.2.0.v201112011158.jar、org.apache.jasper.glassfish-2.2.2.v201112011158.jar