创建的Maven 工程，超类以上找不到"javax.servlet.http.HttpServlet" Java Build Path  

在pom.xml 中添加

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
    <scope>provided</scope>
</dependency>
<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.1</version>
    <scope>provided</scope>
</dependency>

  或者  

    <dependency>
      <groupId>org.apache.geronimo.specs</groupId>
      <artifactId>geronimo-servlet_2.4_spec</artifactId>
      <version>1.1.1</version>
      <scope>provided</scope>
    </dependency>

建立web项目还常需要的jar包

<dependency>
    <groupId>taglibs</groupId>
    <artifactId>standard</artifactId>
    <version>1.1.2</version>
    <type>jar</type>
</dependency>
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
    <type>jar</type>
</dependency>

具体版本可以去提供Maven 库里查询一下 如：http://mvnrepository.com

也可以在maven 项目中设定仓库，如下：

	<!-- 设定主仓库，按设定顺序进行查找。 -->
	<repositories>
	
		<!-- 如有Nexus私服, 取消注释并指向正确的服务器地址.
		<repository>
			<id>nexus-repos</id>
			<name>Team Nexus Repository</name>
			<url>http://192.168.11.36:8888/nexus/content/groups/public</url>
		</repository> -->
		
		<repository>
            <id>oschina-repos</id>
            <name>Oschina Releases</name>
            <url>http://maven.oschina.net/content/groups/public</url>
        </repository>
        
        <repository>
            <id>java-repos</id>
            <name>Java Repository</name>
            <url>http://download.java.net/maven/2/</url>
        </repository>
        
        <repository>
            <id>springsource-repos</id>
            <name>SpringSource Repository</name>
            <url>http://repo.spring.io/release/</url>
        </repository>
        
		<repository>
			<id>central-repos</id>
			<name>Central Repository</name>
			<url>http://repo.maven.apache.org/maven2</url>
		</repository>
		
		<repository>
			<id>central-repos2</id>
			<name>Central Repository 2</name>
			<url>http://repo1.maven.org/maven2/</url>
		</repository>
		
		<repository>
			<id>activiti-repos</id>
			<name>Activiti Repository</name>
			<url>https://maven.alfresco.com/nexus/content/groups/public</url>
		</repository>
		
		<repository>
			<id>activiti-repos2</id>
			<name>Activiti Repository 2</name>
			<url>https://app.camunda.com/nexus/content/groups/public</url>
		</repository>
		
		<repository> 
			<id>thinkgem-repos</id> 
			<name>ThinkGem Repository</name>
			<url>http://git.oschina.net/thinkgem/repos/raw/master</url>
		</repository>
		
		<repository> 
			<id>thinkgem-repos2</id> 
			<name>ThinkGem Repository 2</name>
			<url>https://raw.github.com/thinkgem/repository/master</url>
		</repository>
		
	</repositories>
	
	<!-- 设定插件仓库 -->
	<pluginRepositories> 
	
		<!-- 如有Nexus私服, 取消注释并指向正确的服务器地址.
		<pluginRepository>
			<id>nexus-repos</id>
			<name>Team Nexus Repository</name>
			<url>http://192.168.11.36:8888/nexus/content/groups/public</url>
		</pluginRepository> -->
		
		<pluginRepository>
            <id>oschina-repos</id>
            <name>Oschina Releases</name>
            <url>http://maven.oschina.net/content/groups/public</url>
        </pluginRepository>
		
	</pluginRepositories>