只要改这一个就可以了。port 改成8081即可。<Connector port="8081" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8444" />
下面的不一定有用，第一次是按照下面去做的，第二次就不行了，原因还没时间去深究。
windows下面，一台电脑安装多个tomcat。我安装了2个tomcat 6.0，下载地址http://tomcat.apache.org/download-60.cgi。选择6.0.32目录下的binary distributions下的core 我电脑是32未windows系统，选择了32位windows zip文件。
1）.解压缩到2个目录，对于每个tomcat 6.0目录，打开apache-tomcat-6.0.32in下面的catalina.bat和startup.bat在rem Guess CATALINA_HOME if not defined之后加上set CATALINA_HOME="D:我的文档下载apache-tomcat-6.0.32"，我解压缩的目录为D:我的文档下载。替换为相应的你的解压缩目录。
2）.对于第二个tomcat 6.0 打开apache-tomcat-6.0.32conf下面的servicer.xml文件，查找port，修改port值，我默认的是每个端口值加1.<Server port="8006" shutdown="SHUTDOWN">
<Connector port="8081" protocol="HTTP/1.1" connectionTimeout="20000" redirectPort="8444" />
<Connector port="8010" protocol="AJP/1.3" redirectPort="8444" />
3).分别打开2个startup.bat运行http://localhost:8081和http://localhsot:8080即可。
常见问题：1）.startup.bat一闪即逝，没有设置CATALINA_HOME，按照第一步操作。
2）.2个tomcat对应同一个tomcat，连接端口没有修改，修改Connector port="8081" protocol="HTTP/1.1"
3）.java虚拟机绑定失败，可能没有安装jdk，如果以前java程序可以正常执行，查看Connector port="8010" protocol="AJP/1.3" redirectPort="8444"，确保port值没有重复，redirectPort值和其他几处的redirectPort值相同。
至于登录tomcat的用户名和密码，查看apache-tomcat-6.0.32conf下的tomcat-user.xml文件<tomcat-users>
<user username="tomcat" password="tomcat" roles="manager"/></tomcat-users>，如果文件不存在，新建一个xml文件，拷入上述这句话即可。username和password可变，rles必须是manager。
要想自定义一个常用虚拟路径，比如运行自己写的程序输入地址http://localhost:8080/test，实际的程序在D:/test目录下面，而不是在apache-tomcat-6.0.32webapps目录下面，可以在apache-tomcat-6.0.32conf中的sevicer.xml中，</HOST>之前添加<Contex docBase="D:/test" path="/test" reloadable="true"></Context>。
整个过程十分简单，如果有问题，可以留言。我尽可能帮您解决。谢谢！
server.xml:
<?xml version='1.0' encoding='utf-8'?>
<!--
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!-- Note: A "Server" is not itself a "Container", so you may not
define subcomponents such as "Valves" at this level.
Documentation at /docs/config/server.html
-->
<Server port="8006" shutdown="SHUTDOWN">
<!-- Security listener. Documentation at /docs/config/listeners.html
<Listener className="org.apache.catalina.security.SecurityListener" />
-->
<!--APR library loader. Documentation at /docs/apr.html -->
<Listener className="org.apache.catalina.core.AprLifecycleListener" SSLEngine="on" />
<!--Initialize Jasper prior to webapps are loaded. Documentation at /docs/jasper-howto.html -->
<Listener className="org.apache.catalina.core.JasperListener" />
<!-- Prevent memory leaks due to use of particular java/javax APIs-->
<Listener className="org.apache.catalina.core.JreMemoryLeakPreventionListener" />
<Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener" />
<Listener className="org.apache.catalina.core.ThreadLocalLeakPreventionListener" />
<!-- Global JNDI resources
Documentation at /docs/jndi-resources-howto.html
-->
<GlobalNamingResources>
<!-- Editable user database that can also be used by
UserDatabaseRealm to authenticate users
-->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<!-- A "Service" is a collection of one or more "Connectors" that share
a single "Container" Note: A "Service" is not itself a "Container",
so you may not define subcomponents such as "Valves" at this level.
Documentation at /docs/config/service.html
-->
<Service name="Catalina">
<!--The connectors can use a shared executor, you can define one or more named thread pools-->
<!--
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
maxThreads="150" minSpareThreads="4"/>
-->
<!-- A "Connector" represents an endpoint by which requests are received
and responses are returned. Documentation at :
Java HTTP Connector: /docs/config/http.html (blocking & non-blocking)
Java AJP Connector: /docs/config/ajp.html
APR (HTTP/AJP) Connector: /docs/apr.html
Define a non-SSL HTTP/1.1 Connector on port 8080
-->
<Connector port="8081" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443" />
<!-- A "Connector" using the shared thread pool-->
<!--
<Connector executor="tomcatThreadPool"
port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8444" />
-->
<!-- Define a SSL HTTP/1.1 Connector on port 8443
This connector uses the JSSE configuration, when using APR, the
connector should be using the OpenSSL style configuration
described in the APR documentation -->
<!--
<Connector port="8444" protocol="HTTP/1.1" SSLEnabled="true"
maxThreads="150" scheme="https" secure="true"
clientAuth="false" sslProtocol="TLS" />
-->
<!-- Define an AJP 1.3 Connector on port 8009 -->
<Connector port="8010" protocol="AJP/1.3" redirectPort="8443" />
<!-- An Engine represents the entry point (within Catalina) that processes
every request. The Engine implementation for Tomcat stand alone
analyzes the HTTP headers included with the request, and passes them
on to the appropriate Host (virtual host).
Documentation at /docs/config/engine.html -->
<!-- You should set jvmRoute to support load-balancing via AJP ie :
<Engine name="Catalina" defaultHost="localhost" jvmRoute="jvm1">
-->
<Engine name="Catalina" defaultHost="localhost">
<!--For clustering, please take a look at documentation at:
/docs/cluster-howto.html (simple how to)
/docs/config/cluster.html (reference documentation) -->
<!--
<Cluster className="org.apache.catalina.ha.tcp.SimpleTcpCluster"/>
-->
<!-- Use the LockOutRealm to prevent attempts to guess user passwords
via a brute-force attack -->
<Realm className="org.apache.catalina.realm.LockOutRealm">
<!-- This Realm uses the UserDatabase configured in the global JNDI
resources under the key "UserDatabase". Any edits
that are performed against this UserDatabase are immediately
available for use by the Realm. -->
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase"/>
</Realm>
<Host name="localhost" appBase="webapps"
unpackWARs="true" autoDeploy="true">
<!-- 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="localhost_access_log." suffix=".txt"
pattern="%h %l %u %t "%r" %s %b" />
</Host>
</Engine>
</Service>
</Server>