问题描述： Failed to execute goal org.apache.maven.plugins:maven-war-plugin:2.2:war (default-war) on project java-web-smbms: Error assembling WAR: webxml attribute is required (or pre-existing WEB-INF/web.xml if executing in update mode)

解决方法：pom.xml文件中指定maven打包路径

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>2.2</version>
                <configuration>
                    <!-- 指定web.xml的路径  -->
                    <webXml>web\WEB-INF\web.xml</webXml>
                    <!-- 指定jsp、js、css的路劲 -->
                    <warSourceDirectory>web</warSourceDirectory>
                </configuration>
            </plugin>
        </plugins>
    </build>