利用oauth2生成token

OAuth2生成Token的过程通常是用户登录成功后，向授权服务器发送授权请求，授权服务器验证用户身份并生成Token，然后将Token返回给客户端。客户端在接下来的请求中使用Token进行身份验证和授权。

以下是一个基于Spring Security OAuth2的Token生成示例:

1. 添加Maven依赖

<dependency>
    <groupId>org.springframework.security.oauth</groupId>
    <artifactId>spring-security-oauth2</artifactId>
    <version>2.4.0.RELEASE</version>
</dependency>

2. 配置OAuth2服务器

@Configuration
@EnableAuthorizationServer
public class OAuth2AuthorizationServerConfig extends AuthorizationServerConfigurerAdapter {

    @Autowired
    private AuthenticationManager authenticationManager;

    @Autowired
    private DataSource dataSource;

    @Override
    public void configure(ClientDetailsServiceConfigurer clients) throws Exception {
        clients.jdbc(dataSource);
    }

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

3. 配置Spring Security

@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {

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

    @Override
    @Bean
    public AuthenticationManager authenticationManagerBean() throws Exception {
        return super.authenticationManagerBean();
    }
}

4. 添加授权请求

@Controller
@RequestMapping("/oauth2")
public class OAuth2Controller {

    @Autowired
    private TokenStore tokenStore;

    @RequestMapping(value = "/token", method = RequestMethod.POST)
    @ResponseBody
    public ResponseEntity<?> getToken(@RequestParam("username") String username, @RequestParam("password") String password) {
        UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(username, password);
        OAuth2Authentication authentication = (OAuth2Authentication) authenticationManager.authenticate(authenticationToken);
        OAuth2AccessToken token = tokenStore.getAccessToken(authentication);
        return ResponseEntity.ok(token);
    }
}

以上代码仅供参考，具体实现需要根据实际场景进行调整。