[英]How to Serialize a Map as List using Jackson
How can I serialize a property which is a Map as a List of the Map's values? 如何将作为Map的值的属性序列化为Map的值? I've been able to do other simple conversions using the @JsonSerialize(using=...)
annotation on the getter. 我已经能够使用getter上的@JsonSerialize(using=...)
注释进行其他简单的转换。 However, I am not sure if one exists for what I want to do. 但是,我不确定是否存在我想做的事情。
We needed something similar, in our case we used a customized @JsonSerialize
as you commented, and it was stupid simple: 我们需要类似的东西,在我们的例子中,我们使用了你评论过的定制的@JsonSerialize
,它很简单:
public class MyCustomSerializer extends JsonSerializer<Map<?, ?>> {
@Override
public void serialize(final Map<?, ?> value, final JsonGenerator jgen, final SerializerProvider provider)
throws IOException, JsonProcessingException {
jgen.writeObject(value.values());
}
}
Code using it: 使用它的代码:
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.JsonSerializer;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializerProvider;
import org.codehaus.jackson.map.annotate.JsonSerialize;
public class JacksonTest {
public static class ModelClass {
private final Map<String, String> map;
public ModelClass(final Map<String, String> map) {
super();
this.map = map;
}
@JsonSerialize(using = MyCustomSerializer.class)
public Map<String, String> getMap() {
return map;
}
}
public static void main(final String[] args) throws JsonGenerationException, JsonMappingException, IOException {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.writeValue(System.out, new ModelClass(Collections.singletonMap("test", "test")));
}
}
I implemented using default Serializer to handle values that are not just String : 我实现了使用默认的Serializer来处理不仅仅是String的值:
@Override
public void serialize(final Map<Long, ?> value, final JsonGenerator jgen, final SerializerProvider provider) throws IOException,
JsonProcessingException {
provider.defaultSerializeValue(value.values(), jgen);
}
EDIT : As mentioned by Radu Simionescu this solution only works for Maps of Pojos. 编辑:如Radu Simionescu所述,此解决方案仅适用于Pojos地图。
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