Use tomcat to deploy the project, because the new project is copied from another project, and it is always deployed as the previous project content when deployed with tomcat. Finally found a way
Tomcat deployment project settings, right-click the project name in myeclipse , click properties , find under myeclipse , under project facets , and modify the project name in the web context-root .
Different development tools are also different, and the location under eclipse is different.
This is my first time posting a blog. Although I am not even a rookie now, I will try my best.