Spring boot “我自己也搞不清楚”；[UserDetailsService返回null，这是一种违反接口约定的行为]"；？

我是spring boot和spring security的新手，无法独自理解以下错误。 我的spring boot应用程序只包含两个URL，一个是任何人都可以访问的URL，也就是说，只有其名称密码保存在数据库中，另一个是只有管理员才能访问的URL（添加用户并在MySql数据库中滚动）。 但当我传递用户名和密码时，它会说：-

org.springframework.security.authentication.InternalAuthenticationServiceException: UserDetailsService returned null, which is an interface contract violation

我在下面发布所有必要的课程：-

@Service
public class CustomUserDetailService implements UserDetailsService {

    @Autowired
    private UserRepository repository;

    @Override
    public UserDetails loadUserByUsername(String name) throws UsernameNotFoundException {

        User user= repository.findByname(name);
        CustomUserDetail userDetail=null;
        if(user!=null){
            CustomUserDetail userDetails=new CustomUserDetail();
            userDetails.setUser(user);
        }else{
            throw new UsernameNotFoundException("User not exist with name :" +name);
        }
            return null;
    }
}

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class BasicConfig extends WebSecurityConfigurerAdapter{

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception
    {
        auth.userDetailsService(userDetailsService).passwordEncoder(encodePWD());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception
    {
        http.csrf().disable();
        http
                .authorizeRequests()
                     .antMatchers("/user/").permitAll()
                     .and()
                .authorizeRequests()
                     .antMatchers("/MiniApi/**").hasAnyRole("ADMIN")
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .permitAll();
    }

    @Bean
    public BCryptPasswordEncoder encodePWD()
    {
        return new BCryptPasswordEncoder();
    }
}

@RestController
@RequestMapping("/MiniApi")
public class Admincontroller
{
    @Autowired
    private UserRepository userRepository;

    @Autowired
    private BCryptPasswordEncoder passwordEncoder;

    @PreAuthorize("hasAnyRole('ADMIN')")
    @PostMapping("/admin/add")
    public String addUser(@RequestBody User user)
    {
        String pwd = user.getPassword();
        String encryptPwd = passwordEncoder.encode(pwd);
        user.setPassword(encryptPwd);
        userRepository.save(user);
        return "User added successfully...";
    }
}

public class AnyOne {

    @GetMapping("/anyone")
    public String Anyone()
    {
        return "processing......";
    }
}

CustomUserDetailService:-

@Service
public class CustomUserDetailService implements UserDetailsService {

    @Autowired
    private UserRepository repository;

    @Override
    public UserDetails loadUserByUsername(String name) throws UsernameNotFoundException {

        User user= repository.findByname(name);
        CustomUserDetail userDetail=null;
        if(user!=null){
            CustomUserDetail userDetails=new CustomUserDetail();
            userDetails.setUser(user);
        }else{
            throw new UsernameNotFoundException("User not exist with name :" +name);
        }
            return null;
    }
}

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class BasicConfig extends WebSecurityConfigurerAdapter{

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception
    {
        auth.userDetailsService(userDetailsService).passwordEncoder(encodePWD());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception
    {
        http.csrf().disable();
        http
                .authorizeRequests()
                     .antMatchers("/user/").permitAll()
                     .and()
                .authorizeRequests()
                     .antMatchers("/MiniApi/**").hasAnyRole("ADMIN")
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .permitAll();
    }

    @Bean
    public BCryptPasswordEncoder encodePWD()
    {
        return new BCryptPasswordEncoder();
    }
}

@RestController
@RequestMapping("/MiniApi")
public class Admincontroller
{
    @Autowired
    private UserRepository userRepository;

    @Autowired
    private BCryptPasswordEncoder passwordEncoder;

    @PreAuthorize("hasAnyRole('ADMIN')")
    @PostMapping("/admin/add")
    public String addUser(@RequestBody User user)
    {
        String pwd = user.getPassword();
        String encryptPwd = passwordEncoder.encode(pwd);
        user.setPassword(encryptPwd);
        userRepository.save(user);
        return "User added successfully...";
    }
}

public class AnyOne {

    @GetMapping("/anyone")
    public String Anyone()
    {
        return "processing......";
    }
}

CustomUserDetail

public class CustomUserDetail implements UserDetails {

    private User user;

    /*Getter and Setter*/

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    /*Overriden methods from userDetail*/

    @Override
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return user.getRoles().stream().map(role -> new SimpleGrantedAuthority("Role_"+role))
                .collect(Collectors.toList());
    }

    @Override
    public String getPassword() {
        return user.getPassword();
    }

    @Override
    public String getUsername() {
        return user.getName();
    }

    @Override
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    public boolean isEnabled() {
        return true;
    }
}

控制器类：- 我没有创建两个@Restcontroller类，只有一个@RequestMapping（）充当基本URL

管理员控制器：-

@Service
public class CustomUserDetailService implements UserDetailsService {

    @Autowired
    private UserRepository repository;

    @Override
    public UserDetails loadUserByUsername(String name) throws UsernameNotFoundException {

        User user= repository.findByname(name);
        CustomUserDetail userDetail=null;
        if(user!=null){
            CustomUserDetail userDetails=new CustomUserDetail();
            userDetails.setUser(user);
        }else{
            throw new UsernameNotFoundException("User not exist with name :" +name);
        }
            return null;
    }
}

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class BasicConfig extends WebSecurityConfigurerAdapter{

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception
    {
        auth.userDetailsService(userDetailsService).passwordEncoder(encodePWD());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception
    {
        http.csrf().disable();
        http
                .authorizeRequests()
                     .antMatchers("/user/").permitAll()
                     .and()
                .authorizeRequests()
                     .antMatchers("/MiniApi/**").hasAnyRole("ADMIN")
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .permitAll();
    }

    @Bean
    public BCryptPasswordEncoder encodePWD()
    {
        return new BCryptPasswordEncoder();
    }
}

@RestController
@RequestMapping("/MiniApi")
public class Admincontroller
{
    @Autowired
    private UserRepository userRepository;

    @Autowired
    private BCryptPasswordEncoder passwordEncoder;

    @PreAuthorize("hasAnyRole('ADMIN')")
    @PostMapping("/admin/add")
    public String addUser(@RequestBody User user)
    {
        String pwd = user.getPassword();
        String encryptPwd = passwordEncoder.encode(pwd);
        user.setPassword(encryptPwd);
        userRepository.save(user);
        return "User added successfully...";
    }
}

public class AnyOne {

    @GetMapping("/anyone")
    public String Anyone()
    {
        return "processing......";
    }
}

任何人：-

@Service
public class CustomUserDetailService implements UserDetailsService {

    @Autowired
    private UserRepository repository;

    @Override
    public UserDetails loadUserByUsername(String name) throws UsernameNotFoundException {

        User user= repository.findByname(name);
        CustomUserDetail userDetail=null;
        if(user!=null){
            CustomUserDetail userDetails=new CustomUserDetail();
            userDetails.setUser(user);
        }else{
            throw new UsernameNotFoundException("User not exist with name :" +name);
        }
            return null;
    }
}

@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
public class BasicConfig extends WebSecurityConfigurerAdapter{

    @Autowired
    private UserDetailsService userDetailsService;

    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception
    {
        auth.userDetailsService(userDetailsService).passwordEncoder(encodePWD());
    }

    @Override
    protected void configure(HttpSecurity http) throws Exception
    {
        http.csrf().disable();
        http
                .authorizeRequests()
                     .antMatchers("/user/").permitAll()
                     .and()
                .authorizeRequests()
                     .antMatchers("/MiniApi/**").hasAnyRole("ADMIN")
                .anyRequest().authenticated()
                .and()
                .formLogin()
                .permitAll();
    }

    @Bean
    public BCryptPasswordEncoder encodePWD()
    {
        return new BCryptPasswordEncoder();
    }
}

@RestController
@RequestMapping("/MiniApi")
public class Admincontroller
{
    @Autowired
    private UserRepository userRepository;

    @Autowired
    private BCryptPasswordEncoder passwordEncoder;

    @PreAuthorize("hasAnyRole('ADMIN')")
    @PostMapping("/admin/add")
    public String addUser(@RequestBody User user)
    {
        String pwd = user.getPassword();
        String encryptPwd = passwordEncoder.encode(pwd);
        user.setPassword(encryptPwd);
        userRepository.save(user);
        return "User added successfully...";
    }
}

public class AnyOne {

    @GetMapping("/anyone")
    public String Anyone()
    {
        return "processing......";
    }
}

更改我所做的：- 若我正在从CustomUserDetailService中删除return语句，那个么我得到的是return语句丢失错误，然后我添加了return userDetails； 它给了我：-

首先它问我用户名和密码，我提供了它，然后这个

HTTP状态403–禁止

• 您返回的是null，而不是

  userDetails

---

很抱歉，如果我删除retrun null，我会尝试它，因为返回语句丢失。我在上一节更新了帖子，我提到了我所做的更改…我提到了我所做的更改…以及我得到的输出。。。