How to generate a class folder under the eclipse WEB-INF folder

Source folder: stores the root directory of the. Java source file; Output Folder:. Class compiles and outputs the root directory;
In pure "Java Project", "src" is generally set to source folder, and bin is set to Output Folder. In "WEB Project", "src" is generally set to source folder, set the WEB-INF/classes to output.

You can use: right-click the project name-> "properties"-> "Java build path"-> "Source"-> "Output Folder"-> project name/WEB-INF/classes to set the class directory to compile output directory. For web projects, you must use the classes folder as the compiled output directory.