原因:没有添加maven依赖
解决:项目右键-properties-Deployment Assembly-add-java build path entries-maven dependencies
添加完之后,project-clean,tomcat clean
原因:没有添加maven依赖
解决:项目右键-properties-Deployment Assembly-add-java build path entries-maven dependencies
添加完之后,project-clean,tomcat clean