java实现oauto2.0

OAuth 2.0是一种授权协议，用于在客户端和资源所有者之间授权第三方应用程序访问资源。Java可以使用不同的库和框架来实现OAuth 2.0。

以下是使用Spring Security实现OAuth 2.0的步骤：

1.添加Spring Security OAuth 2.0依赖项。在Maven中，可以使用以下依赖项：

<dependency>
    <groupId>org.springframework.security.oauth</groupId>
    <artifactId>spring-security-oauth2</artifactId>
    <version>2.3.4.RELEASE</version>
</dependency>

2.配置OAuth 2.0客户端。在Spring Security中，可以使用OAuth2RestTemplate或OAuth2AuthorizedClient来访问资源服务器。您需要配置客户端ID，客户端秘密，授权服务器URL和资源服务器URL。

@Configuration
@EnableOAuth2Client
public class OAuth2ClientConfig {

    @Value("${oauth2.clientId}")
    private String clientId;

    @Value("${oauth2.clientSecret}")
    private String clientSecret;

    @Value("${oauth2.accessTokenUri}")
    private String accessTokenUri;

    @Value("${oauth2.userAuthorizationUri}")
    private String userAuthorizationUri;

    @Value("${oauth2.redirectUri}")
    private String redirectUri;

    @Value("${oauth2.resource.userInfoUri}")
    private String userInfoUri;

    @Bean
    public OAuth2RestTemplate oauth2RestTemplate(OAuth2ClientContext oauth2ClientContext) {
        OAuth2ProtectedResourceDetails resourceDetails = new ClientCredentialsResourceDetails();
        ((ClientCredentialsResourceDetails) resourceDetails).setClientId(clientId);
        ((ClientCredentialsResourceDetails) resourceDetails).setClientSecret(clientSecret);
        ((ClientCredentialsResourceDetails) resourceDetails).setAccessTokenUri(accessTokenUri);
        return new OAuth2RestTemplate(resourceDetails, oauth2ClientContext);
    }

    @Bean
    public OAuth2AuthorizedClientService authorizedClientService() {
        return new InMemoryOAuth2AuthorizedClientService(new ClientRegistration());
    }

    private class ClientRegistration implements OAuth2ClientRegistration {
        @Override
        public String getRegistrationId() {
            return "oauth2-client";
        }

        @Override
        public ClientRegistration.ProviderDetails getProviderDetails() {
            return new ClientRegistration.ProviderDetails("oauth2-provider", accessTokenUri, userAuthorizationUri);
        }

        @Override
        public ClientRegistration.ClientCredentials getClientCredentials() {
            return new ClientRegistration.ClientCredentials(clientId, clientSecret, null);
        }

        @Override
        public ClientRegistration.RedirectUri getRedirectUri() {
            return new ClientRegistration.RedirectUri(redirectUri, null);
        }

        @Override
        public OAuth2AccessToken getAccessToken() {
            DefaultOAuth2AccessToken accessToken = new DefaultOAuth2AccessToken("");
            accessToken.setTokenType("Bearer");
            accessToken.setExpiration(null);
            accessToken.setScope(Collections.emptySet());
            return accessToken;
        }

        @Override
        public OAuth2RefreshToken getRefreshToken() {
            return null;
        }

        @Override
        public Map<String, Object> getAdditionalParameters() {
            return null;
        }
    }
}

3.配置OAuth 2.0资源服务器。您需要配置资源服务器URL和OAuth2AuthorizedClientService。

@Configuration
@EnableResourceServer
public class ResourceServerConfig extends ResourceServerConfigurerAdapter {

    @Value("${oauth2.resource.userInfoUri}")
    private String userInfoUri;

    @Autowired
    private OAuth2AuthorizedClientService authorizedClientService;

    @Override
    public void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().anyRequest().authenticated().and().oauth2ResourceServer().jwt();
    }

    @Override
    public void configure(ResourceServerSecurityConfigurer resources) throws Exception {
        resources.resourceId(userInfoUri).tokenServices(tokenServices());
    }

    @Bean
    public JwtAccessTokenConverter accessTokenConverter() {
        JwtAccessTokenConverter accessTokenConverter = new JwtAccessTokenConverter();
        accessTokenConverter.setVerifier(new RsaVerifier("-----BEGIN PUBLIC KEY-----\n" +
                "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmx0K/9PdWtY8Nt1uKjzN\n" +
                "7q3jK0u/vpK+vJSR5iV7XH5r5j5g1rRwRZzH6G4fQ4zF1kKjE1eU6XoU6yVp6Dwz\n" +
                "8TzZJxGZDfzQvv+X9jJcVCsC7obnO/VfRmJd4Q2m4G1Ox6kwOj6XeU6y+oOyVUqu\n" +
                "TzZ1lN6Dx0J2Q0VLG9i/4JfobPav/2Qwv8bD7zJnmZnKJxwpdYvY8WtF1JyweJh7\n" +
                "RGV7iLZKxGx7fRVRv9XVg5Q5i5H5r1cCwq3zV0ZTTjKLZ7VvKEvRb9oV2yC5mJ7O\n" +
                "18gWZ58UCzPjxV0cBNB8YtW1jbxJyN0K0nJh8T7TJbUZDf+ZGJvA8nxJKWuLsJ32\n" +
                "RwIDAQAB\n" +
                "-----END PUBLIC KEY-----"));
        return accessTokenConverter;
    }

    @Bean
    public JwtTokenStore tokenStore() {
        return new JwtTokenStore(accessTokenConverter());
    }

    @Bean
    public JwtAccessTokenConverterConfigurer jwtAccessTokenConverterConfigurer() {
        return new JwtAccessTokenConverterConfigurer();
    }

    private class JwtAccessTokenConverterConfigurer implements BeanPostProcessor {
        @Override
        public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
            if (bean instanceof JwtAccessTokenConverter) {
                ((JwtAccessTokenConverter) bean).setAccessTokenConverter(accessTokenConverter());
            }
            return bean;
        }
    }

    @Bean
    public JwtTokenServices tokenServices() {
        DefaultTokenServices tokenServices = new DefaultTokenServices();
        tokenServices.setTokenStore(tokenStore());
        tokenServices.setTokenEnhancer(accessTokenConverter());
        tokenServices.setSupportRefreshToken(true);
        tokenServices.setReuseRefreshToken(false);
        return new JwtTokenServices(tokenServices, authorizedClientService);
    }
}

4.配置OAuth 2.0授权服务器。您需要配置授权服务器URL和OAuth2AuthorizedClientService。

@Configuration
@EnableAuthorizationServer
public class AuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {

    @Value("${oauth2.clientId}")
    private String clientId;

    @Value("${oauth2.clientSecret}")
    private String clientSecret;

    @Value("${oauth2.accessTokenValiditySeconds}")
    private int accessTokenValiditySeconds;

    @Value("${oauth2.refreshTokenValiditySeconds}")
    private int refreshTokenValiditySeconds;

    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private UserDetailsService userDetailsService;

    @Autowired
    private OAuth2AuthorizedClientService authorizedClientService;

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.inMemory()
                .withClient(clientId)
                .secret(clientSecret)
                .authorizedGrantTypes("password", "refresh_token")
                .scopes("read", "write")
                .accessTokenValiditySeconds(accessTokenValiditySeconds)
                .refreshTokenValiditySeconds(refreshTokenValiditySeconds);
    }

    @Override
    public void configure(AuthorizationServerEndpointsConfigurer endpoints) throws Exception {
        endpoints.authenticationManager(authenticationManager)
                .userDetailsService(userDetailsService)
                .tokenServices(tokenServices());
    }

    @Bean
    public JwtAccessTokenConverter accessTokenConverter() {
        JwtAccessTokenConverter accessTokenConverter = new JwtAccessTokenConverter();
        accessTokenConverter.setSigningKey("secret");
        return accessTokenConverter;
    }

    @Bean
    public JwtTokenStore tokenStore() {
        return new JwtTokenStore(accessTokenConverter());
    }

    @Bean
    public JwtAccessTokenConverterConfigurer jwtAccessTokenConverterConfigurer() {
        return new JwtAccessTokenConverterConfigurer();
    }

    private class JwtAccessTokenConverterConfigurer implements BeanPostProcessor {
        @Override
        public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
            if (bean instanceof JwtAccessTokenConverter) {
                ((JwtAccessTokenConverter) bean).setAccessTokenConverter(accessTokenConverter());
            }
            return bean;
        }
    }

    @Bean
    public JwtTokenServices tokenServices() {
        DefaultTokenServices tokenServices = new DefaultTokenServices();
        tokenServices.setTokenStore(tokenStore());
        tokenServices.setTokenEnhancer(accessTokenConverter());
        tokenServices.setSupportRefreshToken(true);
        tokenServices.setReuseRefreshToken(false);
        return new JwtTokenServices(tokenServices, authorizedClientService);
    }
}

5.在应用程序中使用OAuth 2.0。您可以使用OAuth2RestTemplate或OAuth2AuthorizedClient来访问资源服务器。

@RestController
public class ResourceController {

    @Autowired
    private OAuth2RestTemplate restTemplate;

    @GetMapping("/resource")
    public String getResource() {
        ResponseEntity<String> response = restTemplate.getForEntity("http://localhost:8080/user", String.class);
        return response.getBody();
    }
}

@RestController
public class UserController {

    @GetMapping("/user")
    public String getUser(Principal principal) {
        return principal.getName();
    }
}

以上是使用Spring Security实现OAuth 2.0的步骤。您可以根据您的需求使用其他OAuth 2.0库和框架。