java - 使用 Spring Boot 将 header 参数反序列化为 POJO

Question

作为我的 REST API 的一部分，我需要访问存储在 Authorization header 中编码的 Operator。

我可以这样访问:

@RequestMapping(method = RequestMethod.POST, consumes = "application/json", produces = "application/json")
public Customer post(@RequestBody CustomerRequest request, @RequestHeader(name = "Authorization") String authorization) {
    // Some logic to parse the authorization header here which gets duplicated in every REST method
    Operator operator = parseAuthorization(authorization);
}

但是这有点尴尬，并且每次使用时都需要大量重复代码。

有没有办法可以使用自定义注释和某种形式的中间件来做到这一点，例如:

@RequestMapping(method = RequestMethod.POST, consumes = "application/json", produces = "application/json")
public Customer post(@RequestBody CustomerRequest request, @Operator Operator operator) {
}

Answer 1

这可以使用 Spring Converters 来完成，例如

@Component
public class OperatorHeaderConverter implements Converter<String, Operator> {

    private final AuthenticationService service;

    @Autowired
    public OperatorHeaderConverter(AuthenticationService service) {
        this.service = service;
    }

    @Override
    public Operator convert(String source) {
        return service.parseAuthorization(source);
    }
}

配置使用:

@Configuration
public class ControllerConfiguration extends WebMvcConfigurerAdapter {

    private final OperatorHeaderConverter operatorHeaderConverter;

    @Autowired
    public ControllerConfiguration(OperatorHeaderConverter converter) {
        this.operatorHeaderConverter = converter;
    }

    @Override
    public void addFormatters (FormatterRegistry registry) {
        registry.addConverter(operatorHeaderConverter);
    }

}

并在 Controller 中使用，例如:

@RequestMapping(method = RequestMethod.GET, produces = "application/json")
public List<CustomerResponse> getCustomers(@RequestHeader(name = "Authorization") Operator operator) {
    // Do something with the operator
}