Registro y autorización usando Spring Security usando una aplicación simple como ejemplo

 <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>ark</groupId> <artifactId>spring</artifactId> <version>1.0-SNAPSHOT</version> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.6.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.postgresql</groupId> <artifactId>postgresql</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <version>9.0.27</version> </dependency> <dependency> <groupId>org.springframework.security</groupId> <artifactId>spring-security-taglibs</artifactId> <version>5.2.0.RELEASE</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency> </dependencies> <properties> <java.version>1.8</java.version> </properties> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> 

 @Entity @Table(name = "t_user") public class User implements UserDetails { @Id @GeneratedValue(strategy = GenerationType.IDENTITY) private Long id; @Size(min=2, message = "  5 ") private String username; @Size(min=2, message = "  5 ") private String password; @Transient private String passwordConfirm; @ManyToMany(fetch = FetchType.EAGER) private Set<Role> roles; public User() { } public Long getId() { return id; } public void setId(Long id) { this.id = id; } @Override public String getUsername() { return username; } @Override public boolean isAccountNonExpired() { return true; } @Override public boolean isAccountNonLocked() { return true; } @Override public boolean isCredentialsNonExpired() { return true; } @Override public boolean isEnabled() { return true; } public void setUsername(String username) { this.username = username; } @Override public Collection<? extends GrantedAuthority> getAuthorities() { return getRoles(); } @Override public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getPasswordConfirm() { return passwordConfirm; } public void setPasswordConfirm(String passwordConfirm) { this.passwordConfirm = passwordConfirm; } public Set<Role> getRoles() { return roles; } public void setRoles(Set<Role> roles) { this.roles = roles; } } 

 @Entity @Table(name = "t_role") public class Role implements GrantedAuthority { @Id private Long id; private String name; @Transient @ManyToMany(mappedBy = "roles") private Set<User> users; public Role() { } public Role(Long id) { this.id = id; } public Role(Long id, String name) { this.id = id; this.name = name; } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Set<User> getUsers() { return users; } public void setUsers(Set<User> users) { this.users = users; } @Override public String getAuthority() { return getName(); } } 

 @Service public class UserService implements UserDetailsService { @PersistenceContext private EntityManager em; @Autowired UserRepository userRepository; @Autowired RoleRepository roleRepository; @Autowired BCryptPasswordEncoder bCryptPasswordEncoder; @Override public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException { User user = userRepository.findByUsername(username); if (user == null) { throw new UsernameNotFoundException("User not found"); } return user; } public User findUserById(Long userId) { Optional<User> userFromDb = userRepository.findById(userId); return userFromDb.orElse(new User()); } public List<User> allUsers() { return userRepository.findAll(); } public boolean saveUser(User user) { User userFromDB = userRepository.findByUsername(user.getUsername()); if (userFromDB != null) { return false; } user.setRoles(Collections.singleton(new Role(1L, "ROLE_USER"))); user.setPassword(bCryptPasswordEncoder.encode(user.getPassword())); userRepository.save(user); return true; } public boolean deleteUser(Long userId) { if (userRepository.findById(userId).isPresent()) { userRepository.deleteById(userId); return true; } return false; } public List<User> usergtList(Long idMin) { return em.createQuery("SELECT u FROM User u WHERE u.id > :paramId", User.class) .setParameter("paramId", idMin).getResultList(); } } 

 @Controller public class RegistrationController { @Autowired private UserService userService; @GetMapping("/registration") public String registration(Model model) { model.addAttribute("userForm", new User()); return "registration"; } @PostMapping("/registration") public String addUser(@ModelAttribute("userForm") @Valid User userForm, BindingResult bindingResult, Model model) { if (bindingResult.hasErrors()) { return "registration"; } if (!userForm.getPassword().equals(userForm.getPasswordConfirm())){ model.addAttribute("passwordError", "  "); return "registration"; } if (!userService.saveUser(userForm)){ model.addAttribute("usernameError", "     "); return "registration"; } return "redirect:/"; } } 

 @Controller public class AdminController { @Autowired private UserService userService; @GetMapping("/admin") public String userList(Model model) { model.addAttribute("allUsers", userService.allUsers()); return "admin"; } @PostMapping("/admin") public String deleteUser(@RequestParam(required = true, defaultValue = "" ) Long userId, @RequestParam(required = true, defaultValue = "" ) String action, Model model) { if (action.equals("delete")){ userService.deleteUser(userId); } return "redirect:/admin"; } @GetMapping("/admin/gt/{userId}") public String gtUser(@PathVariable("userId") Long userId, Model model) { model.addAttribute("allUsers", userService.usergtList(userId)); return "admin"; } } 

 @Configuration @EnableWebSecurity public class WebSecurityConfig extends WebSecurityConfigurerAdapter { @Autowired UserService userService; @Bean public BCryptPasswordEncoder bCryptPasswordEncoder() { return new BCryptPasswordEncoder(); } @Override protected void configure(HttpSecurity httpSecurity) throws Exception { httpSecurity .csrf() .disable() .authorizeRequests() //      .antMatchers("/registration").not().fullyAuthenticated() //       .antMatchers("/admin/**").hasRole("ADMIN") .antMatchers("/news").hasRole("USER") //    .antMatchers("/", "/resources/**").permitAll() //     .anyRequest().authenticated() .and() //     .formLogin() .loginPage("/login") //       .defaultSuccessUrl("/") .permitAll() .and() .logout() .permitAll() .logoutSuccessUrl("/"); } @Autowired protected void configureGlobal(AuthenticationManagerBuilder auth) throws Exception { auth.userDetailsService(userService).passwordEncoder(bCryptPasswordEncoder()); } } 

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE HTML> <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/> <link rel="stylesheet" type="text/css" href="${contextPath}/resources/css/style.css"> </head> <body> <div> <h3>${pageContext.request.userPrincipal.name}</h3> <sec:authorize access="!isAuthenticated()"> <h4><a href="/login"></a></h4> <h4><a href="/registration"></a></h4> </sec:authorize> <sec:authorize access="isAuthenticated()"> <h4><a href="/logout"></a></h4> </sec:authorize> <h4><a href="/news"> ( )</a></h4> <h4><a href="/admin"> ( )</a></h4> </div> </body> </html> 

 <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <div> <form:form method="POST" modelAttribute="userForm"> <h2></h2> <div> <form:input type="text" path="username" placeholder="Username" autofocus="true"></form:input> <form:errors path="username"></form:errors> ${usernameError} </div> <div> <form:input type="password" path="password" placeholder="Password"></form:input> </div> <div> <form:input type="password" path="passwordConfirm" placeholder="Confirm your password"></form:input> <form:errors path="password"></form:errors> ${passwordError} </div> <button type="submit"></button> </form:form> <a href="/"></a> </div> </body> </html> 

 <%@ taglib prefix="sec" uri="http://www.springframework.org/security/tags" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Log in with your account</title> </head> <body> <sec:authorize access="isAuthenticated()"> <% response.sendRedirect("/"); %> </sec:authorize> <div> <form method="POST" action="/login"> <h2>  </h2> <div> <input name="username" type="text" placeholder="Username" autofocus="true"/> <input name="password" type="password" placeholder="Password"/> <button type="submit">Log In</button> <h4><a href="/registration"></a></h4> </div> </form> </div> </body> </html> 

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Log in with your account</title> <link rel="stylesheet" type="text/css" href="${contextPath}/resources/css/style.css"> </head> <body> <div> <table> <thead> <th>ID</th> <th>UserName</th> <th>Password</th> <th>Roles</th> </thead> <c:forEach items="${allUsers}" var="user"> <tr> <td>${user.id}</td> <td>${user.username}</td> <td>${user.password}</td> <td> <c:forEach items="${user.roles}" var="role">${role.name}; </c:forEach> </td> <td> <form action="${pageContext.request.contextPath}/admin" method="post"> <input type="hidden" name="userId" value="${user.id}"/> <input type="hidden" name="action" value="delete"/> <button type="submit">Delete</button> </form> </td> </tr> </c:forEach> </table> <a href="/"></a> </div> </body> </html> 

 <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title></title> </head> <body> <div> <h2> <br>    .</h2> <a href="/"></a> </div> </body> </html> 

 INSERT INTO public.t_role(id, name) VALUES (1, 'ROLE_USER'), (2, 'ROLE_ADMIN'); 

 INSERT INTO public.t_user_roles(user_id, roles_id) VALUES (1, 2);