您可以使用JsonAnyGetter批注来创建动态key- value对。下面的示例显示了如何为同一Label类生成3个不同的键：
import com.fasterxml.jackson.annotation.JsonAnyGetter;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.fasterxml.jackson.annotation.JsonRootName;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class JsonApp {
public static void main(String[] args) throws Exception {
AddLabel label = new AddLabel("A label");
label.getLabels().add(AddLabel.Label.remove("Remove"));
label.getLabels().add(AddLabel.Label.set("Set"));
ObjectMapper mapper = new ObjectMapper();
mapper.enable(SerializationFeature.INDENT_OUTPUT);
System.out.println(mapper.writeValueAsString(label));
}
}
@JsonRootName(value = "update")
class AddLabel {
@JsonProperty("labels")
private List<Label> labels;
public AddLabel(String labelName) {
this.labels = new ArrayList<>();
this.labels.add(Label.add(labelName));
}
public List<Label> getLabels() {
return labels;
}
public static class Label {
private final String key;
private final String value;
private Label(String key, String value) {
this.key = key;
this.value = value;
}
public static Label add(String value) {
return new Label("add", value);
}
public static Label remove(String value) {
return new Label("remove", value);
}
public static Label set(String value) {
return new Label("set", value);
}
@JsonAnyGetter
public Map<String, String> getDynamic() {
return Collections.singletonMap(key, value);
}
}
}
上面的代码打印：
{
"labels" : [ {
"add" : "A label"
}, {
"remove" : "Remove"
}, {
"set" : "Set"
} ]
}
也可以看看：
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