Maven添加tomcat插件，运行后子容器启动失败

添加tomcat插件，运行后子容器启动失败

<plugins>
      <!-- 编译插件 -->
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <configuration>
          <source>1.7</source>
          <target>1.7</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>
      <!--添加tomcat插件-->
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.2</version>
        <configuration>
          <path>/</path>
          <port>8080</port>
          <uriEncoding>utf-8</uriEncoding>
          <!--tomcat名称-->
          <server>tomcat7</server>
        </configuration>
      </plugin>
    </plugins>

在maven的pom种添加tomcat插件，子容器启动失败！！！

添加provided，

原因：tomcat自带servlet，会与本地服务器冲突

解决如下：

<dependencies>
	<dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.0.1</version>
		<!--添加provided-->
      <scope>provided</scope>
	</dependency>
</dependencies>