EmployeeWebApp

Built up as an implementation of yet another web framework based on front controller pattern and reflection.

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Working

com.kn.processor is the package where most of the magic happens. It defines two annotations @RequestHandler and @URLMapping.

// a class should be annotated with this to declare that it wants to process web requests.
@RequestHandler

// methods annotated with this are forwarded the web requests defined by the urlPattern
@URLMapping(urlPattern="/getAllEmployees.do")

FrontController serves as the entry point of the app. On its initialisation, it tells the annotation processor where web controllers are defined.

String[] packages = new String[] { "com.kn.controller" };
HandlerFactory.initializeHandlers(getClass().getClassLoader(), packages);

HandlerFactory asks AnnotationProcessor to look for the classes annotated with @RequestHandler and gets the methods annotated with @URLMapping. With the relevant method a Handler object is created with the object and the method reference. This Handler object is stored in a map with the urlParameter value as key. When FrontController recieves a request it looks into this map for a handler to be present and passes the control.

Rest everything is related to the crud operations on an employee. The frontend is built using AngularJS v1.5.

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To run

• create database employee_sdet;
• mysql -uroot -pyourpassword employee_sdet < employee_sdet.sql;
• edit src/main/java/config.properties to change db password