<servlet>
<servlet-name>Helloworld</servlet-name>
<servlet-class>HelloWorldExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Helloworld</servlet-name>
<url-pattern>/HelloWorldExample</url-pattern>
</servlet-mapping>
========================
<servlet-class>HelloWorldExample</servlet-class>
要是有包的话要把包名带上
<servlet-name>Helloworld</servlet-name>
<servlet-class>HelloWorldExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Helloworld</servlet-name>
<url-pattern>/HelloWorldExample</url-pattern>
</servlet-mapping>
========================
<servlet-class>HelloWorldExample</servlet-class>
要是有包的话要把包名带上
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<servlet>
<servlet-name>Helloworld</servlet-name>
<servlet-class>HelloWorldExample</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Helloworld</servlet-name>
<url-pattern>/HelloWorldExample</url-pattern>
</servlet-mapping>
</web-app>
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注意:你写是就该放在<web-app>……</web-app>之间。相信再配置一下就OK了。good luck.
配置完后别忘了重启tomcat ^_^