项目结构如下：
[root@java webapps_bd]# pwd /opt/tomcat/webapps_bd[root@java webapps_bd]# lsapi ?api.war ?ROOT ?ROOT.war其中ROOT是原来的项目根目录，api是新项目。
修改tomcat的配置文件，server.xml
[root@java conf]# vi server.xml <Host name="www.test.cn" ?appBase="webapps_bd" ???????????unpackWARs="true" autoDeploy="true"> ???????<Alias>api.bd.test.cn</Alias> ???????????#增加alias标签 ???????<!-- SingleSignOn valve, share authentication between web applications ????????????Documentation at: /docs/config/valve.html --> ???????<!-- ???????<Valve className="org.apache.catalina.authenticator.SingleSignOn" /> ???????--> ???????<!-- Access log processes all example. ????????????Documentation at: /docs/config/valve.html ????????????Note: The pattern used is equivalent to using pattern="common" --> ???????<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs" ??????????????prefix="bd_access_log" suffix=".txt" ??????????????pattern="%h %l %u %t "%r" %s %b" /> ?????</Host>在Host中增加 <Alias>xxx</Alias>，然后重启tomcat即可。
在tomcat中设置网站别名
原文地址：http://blog.51cto.com/hld1992/2060788