<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.6</version>
                <configuration>
                    <archiveClasses>true</archiveClasses>
                    <packagingExcludes>WEB-INF/web.xml</packagingExcludes>
                    <warSourceExcludes>WEB-INF/classes/cn/**</warSourceExcludes>
                    <webResources>
                        <resource>
                            <directory>src/main/resources</directory>
                            <targetPath>WEB-INF/classes</targetPath>
                            <includes>
                                <include>**</include>
                            </includes>
                        </resource>
                    </webResources>
                </configuration>
            </plugin>

不理解，配置这样：
WEB-INF/classes/cn/**
tomcat 是怎么加载 class 文件的呢