告诉maven，我真的不需要web.xml

<!-- 告诉maven，我真的不需要web.xml -->
<plugin>  
    <groupId>org.apache.maven.plugins</groupId>  
    <artifactId>maven-war-plugin</artifactId>  
    <version>2.6</version>  
    <configuration>  
        <failOnMissingWebXml>false</failOnMissingWebXml>  
    </configuration>  
</plugin> 

<properties>
        <!-- 文件拷贝时的编码 -->  
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>  
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>  
        <!-- 编译时的编码 -->  
        <maven.compiler.encoding>UTF-8</maven.compiler.encoding>  
        <!-- jdk编译版本 -->
        <java.version>1.7</java.version>
        <!-- 代表项目不需要web.xml -->
        <failOnMissingWebXml>false</failOnMissingWebXml>
  </properties>