在eclipse中maven构建Web项目，tomcat插件在maven中的运用

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>