ObjectMapper cannot be resolved to a type uleeb • 2018年8月27日 需要将下列jar包加入项目: jackson-core- jackson-databind- jackson-annotations- http://www.mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind/2.9.6 http://www.mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-core/2.9.6 http://www.mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-annotations/2.9.6