具体错误是:web.xml is missing and <failOnMissingWebXml> is set to true
在pom.xml文件中加入
<plugin><groupId>org.apache.maven.plugins</groupId><artifactId>maven-war-plugin</artifactId><version>2.3</version><configuration> <failOnMissingWebXml>false</failOnMissingWebXml></configuration>
</plugin>
然后右键项目名》maven》update project