在build标签下添加
<build>
<sourceDirectory>src/main/java</sourceDirectory>
<resources>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
<outputDirectory>src/main/webapp/WEB-INF/classes</outputDirectory>
</build>
原文：http://www.cnblogs.com/zhengqun/p/4846288.html