java - jackson : How to serialize into an unnamed array

Question

这是我的 POJO。

public class FolderPage {

private List<ApplicationIcon> applications;

public List<ApplicationIcon> getApplications() {
    return applications;
}

public void setApplications(List<ApplicationIcon> applications) {
    this.applications = applications;
}

@JsonCreator
public FolderPage(List<ApplicationIcon> applications) {
    super();
    this.applications = applications;
}
}

目前它序列化为以下 json { “应用程序”:[{ “应用”: { “id”:“com.microsoft.onenote”， “名称”:“Microsoft OneNote” } }, { “应用”: { "id": "com.microsoft.Office.word", “名称”:“微软Word” } }] }

但是我想将其序列化为未命名的 json 数组，如下所示

[{
    "application": {
        "id": "com.microsoft.onenote",
        "name": "Micrsoft OneNote"
    }
}, {
    "application": {
        "id": "com.microsoft.Office.word",
        "name": "Microsoft word"
    }
}]

我怎样才能达到同样的效果？

编辑POJO 代表我的应用程序对象

@JsonRootName("application")
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonInclude(JsonInclude.Include.NON_NULL)
public class ApplicationIcon extends Icon {

    private String id;
    private String name;
}  

Answer 1

假设ApplicationIcon有getId()和getName()。您可以使用自定义序列化程序来完成此操作:

public static class FolderPageSearialer extends JsonSerializer<FolderPage> {

        @Override
        public void serialize(FolderPage o, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException, JsonProcessingException {
            List<ApplicationIcon> applications = o.getApplications();
            jsonGenerator.writeStartArray(applications.size());
            for (ApplicationIcon application : applications) {
                jsonGenerator.writeStartObject();
                jsonGenerator.writeFieldName("application");
                jsonGenerator.writeStartObject();
                jsonGenerator.writeStringField("id", application.getId());
                jsonGenerator.writeStringField("name", application.getName());
                jsonGenerator.writeEndObject();
                jsonGenerator.writeEndObject();
            }
            jsonGenerator.writeEndArray();
        }
    }

并在FolderPage类上添加@JsonSerialize:

@JsonSerialize(using = FolderPage.FolderPageSearialer.class)
public class FolderPage