1.选中maven，构建maven web
2.项目构建好之后发现一个错误如图，是因为没有servlet的API，我们需要在pom.xml 中对servlet的API进行依赖
pom.xml如下即可：
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.imooc.Webapp2</groupId>
<artifactId>Webapp2</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>Webapp2 Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>Webapp2</finalName>
</build>
</project>
3.我们看项目的结构不是maven的结构，缺少src/main/java和src/test/java的包为此添加这两包
选中maven项目 Build Path , Configuer Build Path
删除图中标识的src/main/java和src/test/java后点击Apply点击OK
最后我们再选中maven项目中的JAVA Resource 右键选中New在选中Source Folder
创建src/main/java
在创建src/test/java
4.在pom.xml中配置tomcat的插件，打开DOS命令到项目的根目录下运行mvn install 即可
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.imooc.Webapp2</groupId>
<artifactId>Webapp2</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>Webapp2 Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>Webapp2</finalName>
<plugins>
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>