先配置您的tomcat环境变量：
在cmd下：
set CATALINA_HOME=d:\tomcat5.0 (根据您的情况定)

再配置jdk环境变量：

set JAVA_HOME=d:\jdk1.4

然后输入：catalina start

tomcat就启动啦！！

--------------------------------------------------------------
都是新手，共同学习！！

我试了，还是不行，有没有别的办法。

Error initializing endpoint
java.net.BindException: Address already in use: JVM_Bind:80
at org.apache.tomcat.util.net.PoolTcpEndpoint.initEndpoint(PoolTcpEndpoint.java:258)
at org.apache.coyote.http11.Http11Protocol.init(Http11Protocol.java:143)
at org.apache.coyote.tomcat5.CoyoteConnector.initialize(CoyoteConnector.java:1402)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:605)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:2369)
at org.apache.catalina.startup.Catalina.load(Catalina.java:507)
at org.apache.catalina.startup.Catalina.load(Catalina.java:528)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:247)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:421)
2006-2-8 16:36:37 org.apache.catalina.startup.Catalina load
严重: Catalina.start
LifecycleException: Protocol handler initialization failed: java.net.BindException: Address already in use: JVM_Bind:80
at org.apache.coyote.tomcat5.CoyoteConnector.initialize(CoyoteConnector.java:1404)
at org.apache.catalina.core.StandardService.initialize(StandardService.java:605)
at org.apache.catalina.core.StandardServer.initialize(StandardServer.java:2369)
at org.apache.catalina.startup.Catalina.load(Catalina.java:507)
at org.apache.catalina.startup.Catalina.load(Catalina.java:528)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.load(Bootstrap.java:247)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:421)
2006-2-8 16:36:37 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 2656 ms
我的tomcat出现上述错误，改了端口也不行，试着关了防火墙，tomcat终于能用了。

可能JDK装上了 没有配置环境变量