java实现oauth2 客户端

在Java中实现OAuth2客户端，可以使用Spring Security OAuth2框架。下面是一个简单的示例代码：

1. 添加依赖

<dependency>
   <groupId>org.springframework.security.oauth</groupId>
   <artifactId>spring-security-oauth2</artifactId>
   <version>2.3.0.RELEASE</version>
</dependency>

2. 配置OAuth2客户端

@Configuration
@EnableOAuth2Client
public class OAuth2ClientConfiguration {
 
    @Bean
    public OAuth2RestTemplate oauth2RestTemplate(OAuth2ClientContext oauth2ClientContext,
            OAuth2ProtectedResourceDetails details) {
        return new OAuth2RestTemplate(details, oauth2ClientContext);
    }
 
    @Bean
    @ConfigurationProperties(prefix = "security.oauth2.client")
    public OAuth2ProtectedResourceDetails oauth2RemoteResource() {
        return new AuthorizationCodeResourceDetails();
    }
 
    @Bean
    public FilterRegistrationBean oauth2ClientFilterRegistration(OAuth2ClientContextFilter filter) {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        registration.setFilter(filter);
        registration.setOrder(-100);
        return registration;
    }
 
}

3. 配置application.properties

security.oauth2.client.client-id=your_client_id
security.oauth2.client.client-secret=your_client_secret
security.oauth2.client.access-token-uri=your_access_token_uri
security.oauth2.client.user-authorization-uri=your_user_authorization_uri
security.oauth2.client.scope=your_scope
security.oauth2.client.pre-established-redirect-uri=your_pre_established_redirect_uri

4. 使用OAuth2RestTemplate发送请求

@RestController
public class OAuth2ClientController {
 
    @Autowired
    private OAuth2RestTemplate oauth2RestTemplate;
 
    @GetMapping("/resource")
    public String getResource() {
        return oauth2RestTemplate.getForObject("your_resource_uri", String.class);
    }
 
}

以上是一个简单的OAuth2客户端的实现，具体实现方式可能会因为不同的需求而有所不同，可以根据实际情况进行调整。