done bra

src/main/java/net/javaguides/springboot/config/SecurityConfiguration.java

@@ -41,7 +41,12 @@ public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
 	@Override
 	protected void configure(HttpSecurity http) throws Exception {
 		http.authorizeRequests()
-				.antMatchers("/admin").hasRole("ADMIN")
+				.antMatchers(
+					"/admin",
+				"/deleteEmployee",
+				"/showFormForUpdate",
+				"/saveUser")
+				.hasRole("ADMIN")
 				.antMatchers(
 				 "/registration**",
 	                "/js/**",

src/main/java/net/javaguides/springboot/service/UserService.java

@@ -1,10 +1,19 @@
 package net.javaguides.springboot.service;
 
+import org.springframework.data.domain.Page;
 import org.springframework.security.core.userdetails.UserDetailsService;
 
 import net.javaguides.springboot.model.User;
 import net.javaguides.springboot.web.dto.UserRegistrationDto;
 
+import java.util.List;
+
 public interface UserService extends UserDetailsService{
 	User save(UserRegistrationDto registrationDto);
+	List<User> getAllUsers();
+	Page<User> findPaginated(int pageNo, int pageSize, String sortField, String sortDirection);
+	User getUserById(long id);
+	void deleteUserById(long id);
+	void saveUser(User user);
+
 }

src/main/java/net/javaguides/springboot/service/UserServiceImpl.java

@@ -2,9 +2,15 @@ package net.javaguides.springboot.service;
 
 import java.util.Arrays;
 import java.util.Collection;
+import java.util.List;
 import java.util.stream.Collectors;
+import java.util.Optional;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.data.domain.Pageable;
+import org.springframework.data.domain.Sort;
 import org.springframework.security.core.GrantedAuthority;
 import org.springframework.security.core.authority.SimpleGrantedAuthority;
 import org.springframework.security.core.userdetails.UserDetails;
@@ -52,5 +58,42 @@ public class UserServiceImpl implements UserService{
 	private Collection<? extends GrantedAuthority> mapRolesToAuthorities(Collection<Role> roles){
 		return roles.stream().map(role -> new SimpleGrantedAuthority(role.getName())).collect(Collectors.toList());
 	}
+
+	@Override
+	public Page<User> findPaginated(int pageNo, int pageSize, String sortField, String sortDirection) {
+		Sort sort = sortDirection.equalsIgnoreCase(Sort.Direction.ASC.name()) ? Sort.by(sortField).ascending() :
+				Sort.by(sortField).descending();
+
+		Pageable pageable = PageRequest.of(pageNo - 1, pageSize, sort);
+		return this.userRepository.findAll(pageable);
+	}
+
+	@Override
+	public List<User> getAllUsers() {
+		return userRepository.findAll();	
+	}
+
+	@Override
+	public User getUserById(long id) {
+		Optional<User> optional = userRepository.findById(id);
+		User user = null;
+		if (optional.isPresent()) {
+			user = optional.get();
+		} else {
+			throw new RuntimeException(" Employee not found for id :: " + id);
+		}
+		return user;
+	}
+
+	@Override
+	public void deleteUserById(long id) {
+		this.userRepository.deleteById(id);
+	}
+
+	@Override
+	public void saveUser(User user) {
+		this.userRepository.save(user);
+	}
+
 	
 }

src/main/java/net/javaguides/springboot/web/MainController.java

@@ -1,10 +1,28 @@
 package net.javaguides.springboot.web;
 
+import net.javaguides.springboot.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.Slice;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.GetMapping;
+import java.util.List;
+import net.javaguides.springboot.model.User;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestParam;
+
+
+import org.springframework.web.bind.annotation.ModelAttribute;
+import org.springframework.web.bind.annotation.PostMapping;
+
+import net.javaguides.springboot.service.UserService;
+
 
 @Controller
 public class MainController {
+	@Autowired
+	private UserService userService;
 	
 	@GetMapping("/login")
 	public String login() {
@@ -13,11 +31,43 @@ public class MainController {
 	
 	@GetMapping("/")
 	public String home() {
+
 		return "index";
 	}
 
+
+
 	@GetMapping("/admin")
-	public String admin() {
+	public String admin(Model model) {
+		List<User> listUsers = userService.getAllUsers();
+		model.addAttribute("listUsers", listUsers);
+
 		return "admin";
 	}
+	@GetMapping("/deleteEmployee/{id}")
+	public String deleteEmployee(@PathVariable (value = "id") long id) {
+		
+		// call delete employee method 
+		this.userService.deleteUserById(id);
+		return "redirect:/admin";
+	}
+
+	@GetMapping("/showFormForUpdate/{id}")
+	public String showFormForUpdate(@PathVariable ( value = "id") long id, Model model) {
+		
+		User user = userService.getUserById(id);
+		
+		model.addAttribute("user",user);
+		return "update_user";
+	}
+	@PostMapping("/saveUser")
+	public String saveUser(@ModelAttribute("employee") User user) {
+		// save employee to database
+		userService.saveUser(user);
+		return "redirect:/";
+	}
+
+
+
+
 }

src/main/resources/templates/admin.html

@@ -37,9 +37,26 @@
 	<br>
 	<br>
 
-	<div class="container">
-		<h1>The good shit</h1>
-		Welcome <span sec:authentication="principal.username"> Admin</span>
-	</div>
+	<table class="table table-dark">
+		<thead>
+		  <tr>
+			<th scope="col">#</th>
+			<th scope="col">FirstName</th>
+			<th scope="col">LastName</th>
+			<th scope="col">Email</th>
+		  </tr>
+		</thead>
+		<tbody>
+			<tr th:each="user : ${listUsers}">
+				<th th:text="${user.id}"></th>
+				<td th:text="${user.firstName}"></td>
+				<td th:text="${user.lastName}"></td>
+				<td th:text="${user.email}"></td>
+				<td> <a th:href="@{/showFormForUpdate/{id}(id=${user.id})}" class="btn btn-primary">Update</a>
+					<a th:href="@{/deleteEmployee/{id}(id=${user.id})}" class="btn btn-danger">Delete</a>
+				</td>
+			</tr>
+		</tbody>
+	  </table>
 </body>
 </html>

src/main/resources/templates/index.html

@@ -29,6 +29,7 @@
 			<div id="navbar" class="collapse navbar-collapse">
 				<ul class="nav navbar-nav">
 					<li sec:authorize="isAuthenticated()"><a th:href="@{/logout}">Logout</a></li>
+					<li sec:authorize="isAuthenticated()"><a th:href="@{/admin}">Admin</a></li>
 				</ul>
 			</div>
 		</div>
@@ -41,8 +42,6 @@
 		<h1>Registration and Login with Spring Boot, Spring Security,
 			Thymeleaf, Hibernate and MySQL</h1>
 		Welcome <span sec:authentication="principal.username"> User</span>
-		<button type="button" class="btn btn-primary"
-			th:href="@{/admin}">admin</button>
 	</div>
 </body>
 </html>

src/main/resources/templates/update_user.html

@@ -0,0 +1,39 @@
+<!DOCTYPE html>
+<html lang="en" xmlns:th="http://www.thymeleaf.org">
+<head>
+<meta charset="ISO-8859-1">
+<title>Employee Management System</title>
+
+<link rel="stylesheet"
+	href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css">
+</head>
+<body>
+	<div class="container">
+		<h1>Employee Management System</h1>
+		<hr>
+		<h2>Update Employee</h2>
+
+		<form action="#" th:action="@{/saveUser}" th:object="${user}"
+			method="POST" th:href="@{/admin}">
+			
+			<!-- Add hidden form field to handle update -->
+			<input type="hidden" th:field="*{id}" />
+			
+			<input type="text" th:field="*{firstName}" class="form-control mb-4 col-4">
+				
+				<input type="text" th:field="*{lastName}" class="form-control mb-4 col-4">
+				
+				<input type="text" th:field="*{email}" class="form-control mb-4 col-4">
+                
+                <input type="text" th:field="*{password}" class="form-control mb-4 col-4">
+
+				
+				<button type="submit" class="btn btn-info col-2" th:href = "@{/admin}"> Update User</button>
+		</form>
+		
+		<hr>
+		
+		<a th:href = "@{/admin}"> Back to User List</a>
+	</div>
+</body>
+</html>