使用tomcat的登陆方式
TOMCAT_HOME/conf/tomcat-users.xml的内容编辑：
<tomcat-users> <role rolename="tomcat"/> <user username="tomcat" password="tomcat" roles="tomcat"/> <role rolename="admin"/> <user username="admin" password="123456" roles="admin"/></tomcat-users>
WEB-APP/WEB-INF/web.xml的内容编辑：
<security-constraint><web-resource-collection><web-resource-name>jsp1</web-resource-name><url-pattern>/jsp1/*</url-pattern><http-method>GET</http-method></web-resource-collection><auth-constraint><role-name>admin</role-name></auth-constraint></security-constraint><security-role><role-name>admin</role-name></security-role><login-config><auth-method>BASIC</auth-method><realm-name>User Basic Login</realm-name></login-config>?
?休
