Software ：
apache-tomcat-6.0.18
eclipse-jee-ganymede-SR1-win32.zip（Version: 3.4.1，Build id: M20080911-1700）
Step ：
New -> Web -> Dynamic Web Project (Target Runtime:Apache Tomcat 6.0;Dynamic Web Module Version:2.5)
Window -> Show View -> Servers, New-> Server, Add and Remove Projects...，Start (Server)
Warning :
[SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.j2ee.server:demo' did not find a matching property.
Solution ：
Server's Properties -> General -> Location = /Servers/Tomcat v6.0 Server at localhost.server;
Project Explorer -> Servers -> Tomcat v6.0 Server at localhost.server, double click to open it.
Server Options -> Check "Publish module contexts to separate XML files ".
Explaination :
Tomcat of previous version doesn't support the "source" attribute in the "Context" node of "server.xml" file.
Result :
A separate XML file named "demo.xml" was created in the "$server path$\conf\Catalina\localhost\".
Reference :
转载地址http://www.ibm.com/developerworks/opensource/library/os-eclipse-tomcat/
同样的例子：
http://blog.csdn.net/democreen/archive/2011/04/02/6296907.aspx
这个比较好！
http://blog.csdn.net/atiger06/archive/2008/12/10/3491299.aspx