在pom.xml中添加servlet

<dependency>

	<groupId>javax.servlet</groupId>

	<artifactId>javax.servlet-api</artifactId>

	<version>3.0.1</version>

	<scope>provided</scope>

</dependency>

		<!-- <dependency>

			<groupId>javax</groupId>

			<artifactId>javaee-api</artifactId>

			<version>7.0</version>

			<scope>provided</scope>

		</dependency> -->

        <!-- 	 <dependency>

			<groupId>org.glassfish.web</groupId>

			<artifactId>javax.servlet.jsp.jstl</artifactId>

			<version>1.2.2</version>

		</dependency> -->

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<groupId>11</groupId>

	<artifactId>11</artifactId>

	<version>0.0.1-SNAPSHOT</version>

	<packaging>war</packaging>

	<name>11</name>

	<description />

	<properties>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

	</properties>

	<dependencies>

		<dependency>

			<groupId>javax.servlet</groupId>

			<artifactId>javax.servlet-api</artifactId>

			<version>3.0.1</version>

			<scope>provided</scope>

		</dependency>

		<!-- <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId>

			<version>7.0</version> <scope>provided</scope> </dependency> -->

		<!-- <dependency> <groupId>org.glassfish.web</groupId> <artifactId>javax.servlet.jsp.jstl</artifactId>

			<version>1.2.2</version> </dependency> -->

	</dependencies>

	<build>

		<plugins>

			<plugin>

				<artifactId>maven-compiler-plugin</artifactId>

				<version>2.3.2</version>

				<configuration>

					<source>1.7</source>

					<target>1.7</target>

				</configuration>

			</plugin>

			<plugin>

				<artifactId>maven-war-plugin</artifactId>

				<version>2.2</version>

				<configuration>

					<version>3.1</version>

					<failOnMissingWebXml>false</failOnMissingWebXml>

				</configuration>

			</plugin>

			<plugin>

				<groupId>org.apache.tomcat.maven</groupId>

				<artifactId>tomcat7-maven-plugin</artifactId>

				<configuration>

					<port>9921</port>

					<path>/</path>

				</configuration>

			</plugin>

		</plugins>

	</build>

</project>