当用户在springboot中调用注册RESTAPI时，如何获取oAuth2访问令牌？

目前我正在研究Springboot安全性，它对我来说是全新的。我学习了youtube视频教程

当我使用下面的代码段时，我成功地获得了oauth2 access_令牌：-

@SpringBootApplication
public class MathifyApplication {
    @Autowired
    private PasswordEncoder passwordEncoder;


    public static void main(String[] args) {
        SpringApplication.run(MathifyApplication.class, args);
    }

    @Autowired
    public void authenticationManager(AuthenticationManagerBuilder builder, UserRepository repository, UserService service) throws Exception {
        //Setup a default user if db is empty
        User students = new User("stu1", "user", "user", "abc@gmail.com", "1234567890", "12th", "dwarka sec-12", 
            0, 0 , "may/29/2017", "", Arrays.asList(new Role("USER"), new Role("ACTUATOR")));
        if (repository.count()==0){
            service.save(students);
        }
        builder.userDetailsService(userDetailsService(repository)).passwordEncoder(passwordEncoder);
    }

    private UserDetailsService userDetailsService(final UserRepository repository) {
        return userName -> new CustomUserDetails(repository.findByUsername(userName));
    }

}

控制器类为：-

@RestController
public class LoginController {
    @Autowired
    private UserService userService;

    @RequestMapping(value = "/mathify/getuser/{userId}", method = RequestMethod.GET)
    public User getUser(@PathVariable String userId){
        System.out.println("Userid "+userId);
        return userService.getUser(userId);
    }

    @RequestMapping(method = RequestMethod.POST, value="/mathify/signup")
    public User register(@RequestBody User user){

        return userService.doSignup(user);

    }

    @GetMapping(value="/hi")
    public String test(){

         return "Oh ! I am fine without secuirity";
    }

}

通过上面的代码片段，我可以获得access_token（/oauth/token），并且我还可以毫无问题地调用其他控制器类私有API

但是上面的代码有一个问题。什么？在上面的代码片段中，用户是硬编码的，但当我想在用户注册时获得访问令牌时，它给出了一个异常

2017-06-18 11:04:05.689 ERROR 8492 --- [nio-8080-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Cannot apply org.springframework.security.config.annotation.authentication.configurers.userdetails.DaoAuthenticationConfigurer@6b66d7ac to already built object] with root cause

java.lang.IllegalStateException: Cannot apply org.springframework.security.config.annotation.authentication.configurers.userdetails.DaoAuthenticationConfigurer@6b66d7ac to already built object
    at org.springframework.security.config.annotation.AbstractConfiguredSecurityBuilder.add(AbstractConfiguredSecurityBuilder.java:196) ~[spring-security-config-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.security.config.annotation.AbstractConfiguredSecurityBuilder.apply(AbstractConfiguredSecurityBuilder.java:133) ~[spring-security-config-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder.apply(AuthenticationManagerBuilder.java:290) ~[spring-security-config-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder.userDetailsService(AuthenticationManagerBuilder.java:187) ~[spring-security-config-4.2.2.RELEASE.jar:4.2.2.RELEASE]
    at com.techiesandeep.mathify.controller.LoginController.register(LoginController.java:40) ~[classes/:na]

为了实现上述功能，我在应用程序和控制器中做了一些更改

申请类别如下：-

@SpringBootApplication
public class MathifyApplication {
    @Autowired
    private PasswordEncoder passwordEncoder;


    public static void main(String[] args) {
        SpringApplication.run(MathifyApplication.class, args);
    }
}

控制器类别如下：-

@RestController
public class LoginController {
  @Autowired
        private UserService userService;
        @Autowired
        AuthenticationManagerBuilder builder;
        @Autowired
        private PasswordEncoder passwordEncoder;
        @Autowired
        private UserRepository repository;


        @RequestMapping(value = "/mathify/getuser/{userId}", method = RequestMethod.GET)
        public User getUser(@PathVariable String userId){
            System.out.println("Userid "+userId);
            return userService.getUser(userId);
        }

        @RequestMapping(method = RequestMethod.POST, value="/user/signup")
        public User register(@RequestBody User user) throws Exception {
            User u = userService.doSignup(user);
            builder.userDetailsService(userDetailsService(repository)).passwordEncoder(passwordEncoder);
            return u;
        }

        private UserDetailsService userDetailsService(final UserRepository repository) {
            return userName -> new CustomUserDetails(repository.findByUsername(userName));
        }

        @GetMapping(value="/hi")
        public String test(){

             return "Oh ! I am fine without secuirity";
        }
}

---

任何帮助都是值得的。谢谢你可以打另一个POST请求来获取访问令牌。 我不确定这是不是最好的方法，但对我来说效果很好

注册请求映射中的代码剪贴示例：

    RestTemplate restTemplate = new RestTemplate();
    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);
    headers.set("Authorization", auth_header);
    /*auth_header should be Autorization header value that captured from signup request, which is generated by Basic Auth with clientID and secret, for example, "Basic bXktdHJ1c3RlZC1jbGllbnQ6c2VjcmV0" */
    HttpEntity<String> entity = new HttpEntity<String>("",headers);
    String authURL = "http://localhost:8080/oauth/token?grant_type=password&username=yourusername&password=yourpassword";
    ResponseEntity<String> response = restTemplate.postForEntity(authURL, entity, String.class);

    System.out.println(response.getBody());

RestTemplate RestTemplate=new RestTemplate（）；
HttpHeaders=新的HttpHeaders（）；
headers.setContentType（MediaType.APPLICATION_JSON）；
headers.set（“授权”，auth_header）；
/*auth_header应该是从注册请求中捕获的自动化头值，该值由带有clientID和secret的Basic auth生成，例如，“Basic bXktdHJ1c3RlZC1jbGllbnQ6c2VjcmV0”*/
HttpEntity=新的HttpEntity（“，标题）；
字符串authURL=”http://localhost:8080/oauth/token?grant_type=password&username=yourusername&password=yourpassword";
ResponseEntity response=restTemplate.postForEntity（authURL，entity，String.class）；
System.out.println（response.getBody（））；

您正在动态构建身份验证管理器。这是我第一次看到这个，我强烈建议不要这样做。@Shazin基本上我想在成功注册RESTAPI后给用户一个令牌，你能指导我吗？我在谷歌上搜索了很多，但没有得到任何相关的东西。任何链接或任何指南都会很有帮助。非常感谢您可以请求oauth/token端点来获取访问令牌。