Jackson/YAML:将key-value解析为class

Question

在我的输入yaml文件中，我有以下内容：

services:
  postgresql:
    image: "postgres:10"
  redis:
    image: "redis:4"

将services字段解析为Map<String, Service>很容易

public class DockerCompose {
    public static class Service {
        private String image;
    }

    private Map<String, Service> services;
}

我想用Service中字段name中的名称解析List<Service>中的services字段，如下所示：

public class DockerCompose {
    public static class Service {
        private String name;
        private String image;
    }

    private List<Service> services;
}

这个是可能的吗？

Answer 1

最简单的选择是为反序列化添加自定义setter，为序列化添加getter。

public static class DockerCompose {

    public static class Service {
        @JsonIgnore // for serialization
        private String name;
        private String image;
    }

    @JsonProperty("services") // for derserialization
    public void setServicesMap(Map<String, Service> servicesMap){
        for (Map.Entry<String, Service> entry  :servicesMap.entrySet()) {
            entry.getValue().name = entry.getKey();
            services.add(entry.getValue());
        }
    }

    @JsonProperty("services") // for serialization
    public Map<String, Service> getServicesMap() {
        Map<String, Service> map = new HashMap<>();
        for(Service s: services)
            map.put(s.getName(), s);
        return map;
    }

    @JsonIgnore // for serialization
    private List<Service> services = new ArrayList<>();
}