Adding Routes Dynamically to gateway

Need to add service registered with Eureka server as routes dynamically to spring cloud gateway.
Have got it working using

spring.cloud.gateway.discovery.locator.lowerCaseServiceId: true
spring.cloud.gateway.discovery.locator.enabled: true
spring.cloud.gateway.discovery.locator.predicates[0].name: Path
spring.cloud.gateway.discovery.locator.predicates[0].args[pattern]: "'/api/'+serviceId+'/**'"
spring.cloud.gateway.discovery.locator.filters[0].name: StripPrefix
spring.cloud.gateway.discovery.locator.filters[0].args[_genkey_0]: 1

Can someone help me in converting this to Java Code? Need to do this to use readBody() which we cannot do in yaml files as per https://github.com/spring-cloud/spring-cloud-gateway/issues/690