使用 jackson 在 spring 引导中反序列化不区分大小写的 requestParam 枚举

Question

I'm having below api

  @GetMapping(value = "/employees")
    public List<Employee> getEmployees(
        @RequestParam(value = "mode", required = false) final EmployeeMode mode) {
        //calling service from here
    }

I'm having EmployeeMode enum as requestParam.

public enum EmployeeMode {

    REGULAR,
    ALL,
    TEMPROARY
}

I want to accept request with case insensitive. Tried with @JsonAlias , @JsonCreator and objectMapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS, true); and spring.jackson.mapper.accept-case-insensitive-enums: true . nothing worked for me.

I'm using spring boot 2.5.5.

How to accept case insensitive request with requestParam? And if requestParam is empty/null, want to set default enum as ALL.

Answer 1

You can handle it by implementing converter.

public class EmployeeModeConverter implements Converter<String, EmployeeMode> {
    @Override
    public EmployeeMode convert(String source) {
        switch (source.toUpperCase()) {
            case "REGULAR": return EmployeeMode.Regular;
            case "TEMPROARY": return EmployeeMode.TEMPROARY;
            default: return EmployeeMode.ALL;
        }        
    }
}

@Configuration
public class Config extends WebMvcConfigurationSupport {
    @Override
    public void addFormatters(FormatterRegistry registry) {
        registry.addConverter(new EmployeeModeConverter());
    }
}