如何返回Optional< T>作为Spring @RestController中的JSON?
问题描述：
@RestController中有代码:
There is the code in the @RestController:
@GetMapping("update_odds")
public Optional<OddsJSON> updateOdds() {
return eventService.updateOdds();
}
此方法在浏览器中的结果:
Result of this method in the browser:
{
present: true
}
是否可以配置Jackson映射器以输出Optional的值?
Is it possible to configure Jackson mapper to output the value of Optional?
答
只需将其添加到pom.xml文件中即可:
Just need to add to the pom.xml file:
<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jdk8</artifactId>
<version>2.6.3</version>
</dependency>