一、需要下载一个tomcat，这里演示采用tomcat8。
二、打开tomcat-1.8\webapps：
新建example文件，在example下新建test.html，添加如下内容：
<!DOCTYPE HTML><html lang="en"><head> <meta charset="UTF-8"> <title>Apache Tomcat Examples</title> </head> <body> <p> <h3>Apache Tomcat Examples</H3> <p></p> <ul> <li><a href="servlets">Servlets examples</a></li> <li><a href="jsp">JSP Examples</a></li> <li><a href="websocket/index.xhtml">WebSocket Examples</a></li> </ul> </body></html>
三、打开tomcat-1.8\conf下的server.xml文件：
找到如下标签<Host></Host>:
<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>
修改成如下，添加了（<Context path="" docBase="example" reloadable="true"/>），docBase=刚刚新建的项目名example：
<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" />
<Context path="" docBase="example" reloadable="true"/>
</Host>
四、打开tomcat-1.8\conf下的web.xml文件：
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
修改为，添加刚刚新建的test.html：
<welcome-file-list>
<welcome-file>test.html</welcome-file>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
五、打开tomcat-1.8\bin，双击startup.bat启动tomcat：
在浏览器输入localhost:8080:
可以看到默认的页面变成了我们指定的页面