问题

我有以下API：

```java
@GetMapping(value = "/employees")
public List<Employee> getEmployees(
    @RequestParam(value = "mode", required = false) final EmployeeMode mode) {
    // 在这里调用服务
}

我有一个名为EmployeeMode的枚举作为请求参数。

public enum EmployeeMode {

    REGULAR,
    ALL,
    TEMPORARY
}

我想要接受大小写不敏感的请求。尝试过@JsonAlias、@JsonCreator、objectMapper.configure(MapperFeature.ACCEPT_CASE_INSENSITIVE_ENUMS, true)以及spring.jackson.mapper.accept-case-insensitive-enums: true，但都没有奏效。

我正在使用Spring Boot 2.5.5。

如何接受大小写不敏感的请求参数？如果请求参数为空/为null，想要将默认枚举设置为ALL。

<details>
<summary>英文:</summary>

I&#39;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.



</details>


# 答案1
**得分**: 3

你可以通过实现转换器来处理它。

```java
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());
    }
}

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());
    }
}