解决eclipse 项目加载（部署）不到tomcat容器里面 报错：Tomcat version 7.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 and 6 Web modules

1.在eclipse的workspace里面找到该项目.settings文件夹

2.编辑org.eclipse.wst.common.project.facet.core.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<faceted-project>
  <fixed facet="wst.jsdt.web"/>
  <installed facet="wst.jsdt.web" version="1.0"/>
  <installed facet="java" version="1.7"/>
  <installed facet="jst.web" version="2.5"/>    编译后应该是3.1  修改成2.5就可以啦
</faceted-project>

3.重启eclipse