<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
    id="WebApp_ID" version="3.0">

  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <error-page>
    <location>/errors</location>
  </error-page>


  <filter>
      <filter-name>sitemesh</filter-name>
      <filter-class>org.sitemesh.config.ConfigurableSiteMeshFilter</filter-class>
  </filter>
  <filter-mapping>
      <filter-name>sitemesh</filter-name>
      <url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>

<?xml version="1.0" encoding="windows-1251"?>

<sitemesh>
 <mapping path="/views/allStudents" decorator="/WEB-INF/decorators/defaultDecorator.jsp"/>
 <mapping path="/views/addStudent" decorator="/WEB-INF/decorators/defaultDecorator.jsp"/>
 <mapping path="/views/editStudent" decorator="/WEB-INF/decorators/defaultDecorator.jsp"/>
 <mapping path="/views/index" decorator="/WEB-INF/decorators/defaultDecorator.jsp"/>

</sitemesh>

.<?xml version="1.0" encoding="ISO-8859-1"?>

<decorators defaultdir="/WEB-INF/decorators">


    <decorator name="mainpage" page="menutemplate.jsp">
        <pattern>/index</pattern>
    </decorator>

package adil.java.schoolmaven.controller;

import java.io.File;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletContext;
import adil.java.schoolmaven.entity.Student;
import adil.java.schoolmaven.service.StudentService;
import java.nio.file.FileSystemException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class StudentController {



    @Autowired
    private ServletContext servletContext;

    // Constructor based Dependency Injection
    private StudentService studentService;

    public StudentController() {

    }

    @Autowired
    public StudentController(StudentService studentService) {
        this.studentService = studentService;
    }


    @RequestMapping(value = {"/", "/index"}, method = RequestMethod.GET)
    public ModelAndView hello() {
        ModelAndView mv = new ModelAndView();
        mv.setViewName("index");
        return mv;
    }

    // Get All Users
    @RequestMapping(value = "/allStudents", method = {RequestMethod.GET, RequestMethod.POST})
    public ModelAndView displayAllUser() {
        System.out.println("User Page Requested : All Students");
        ModelAndView mv = new ModelAndView();
        List<Student> studentList = studentService.getAllStudents();
        mv.addObject("studentList", studentList);
        mv.setViewName("allStudents");
        return mv;
    }

    @RequestMapping(value = "/addStudent", method = RequestMethod.GET)
    public ModelAndView displayNewUserForm() {
        ModelAndView mv = new ModelAndView("addStudent");
        mv.addObject("headerMessage", "Add Student Details");
        mv.addObject("student", new Student());
        return mv;
    }

    @PostMapping(value = "/addStudent")
    public String saveNewStudent(@RequestParam("name") String name,
            @RequestParam("surname") String surname,
            @RequestParam("avatar") MultipartFile file)
            throws IOException {

        if (file != null && !file.isEmpty()) {
            Student student = new Student();
            student.setSurname(surname);
            student.setName(name);
            student.setAvatar(studentService.saveAvatarImage(file).getName());
            studentService.saveStudent(student);
        }
        return "redirect:/allStudents";
    }



    @GetMapping(value = "/editStudent/{id}")
    public ModelAndView displayEditUserForm(@PathVariable Long id) {
        ModelAndView mv = new ModelAndView("/editStudent");
        Student student = studentService.getStudentById(id);
        mv.addObject("headerMessage", "Редактирование студента");
        mv.addObject("student", student);
        return mv;
    }

   @PostMapping(value = "/editStudent")

    public ModelAndView saveEditedUser(@RequestParam("id") Long id,

            @RequestParam("name") String name,

            @RequestParam("surname") String surname,

            @RequestParam("avatar") MultipartFile file) {
        ModelAndView mv = new ModelAndView("redirect:/allStudents");

       try {

            studentService.updateStudent(name, surname, file, studentService.getStudentById(id));

         }

        catch (FileSystemException ex){

            ex.printStackTrace();

         }

        catch (IOException e) {

             return new ModelAndView("error");

         }

        return mv;
    }

   @GetMapping(value = "/deleteStudent/{id}")
    public ModelAndView deleteUserById(@PathVariable Long id) {
         studentService.deleteStudentById(id);
        ModelAndView mv = new ModelAndView("redirect:/allStudents");

        return mv;

    }
}