在maven工程中运行表现层出现的问题及解决

这是因为缺少dubbo依赖，需要加上

<dependency>
		<groupId>com.alibaba</groupId>
		<artifactId>dubbo</artifactId>
		<!-- 排除依赖 -->
		<exclusions>
			<exclusion>
				<groupId>org.springframework</groupId>
				<artifactId>spring</artifactId>
			</exclusion>
			<exclusion>
				<groupId>org.jboss.netty</groupId>
				<artifactId>netty</artifactId>
			</exclusion>
		</exclusions>
	</dependency>
	<dependency>
		<groupId>org.apache.zookeeper</groupId>
		<artifactId>zookeeper</artifactId>
	</dependency>
	<dependency>
		<groupId>com.github.sgroschupf</groupId>
		<artifactId>zkclient</artifactId>
	</dependency>