用Jackson序列化数组 [英] Serializing array with Jackson

问题描述

我正在序列化以下模型：

I'm serializing the following model:

class Foo {

    private List<String> fooElements;
}

如果 fooElements 包含字符串'one'，'two'和'three。 JSON包含一个字符串：

If fooElements contains the strings 'one', 'two' and 'three. The JSON contains one string:

{
    "fooElements":[
         "one, two, three"
     ]
}

如何让它看起来像这样：

How can I get it to look like this:

{
    "fooElements":[
         "one", "two", "three"
     ]
}

推荐答案

我得到了它通过添加自定义序列化器来工作：

I got it working by adding a custom serializer:

class Foo {
    @JsonSerialize(using = MySerializer.class)
    private List<String> fooElements;
}

public class MySerializer extends JsonSerializer<Object> {

    @Override
    public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider)
            throws IOException, JsonProcessingException {
        List<String> fooList = (List<String>) value;

        if (fooList.isEmpty()) {
            return;
        }

        String fooValue = fooList.get(0);
        String[] fooElements = fooValue.split(",");

        jgen.writeStartArray();
        for (String fooValue : fooElements) {
            jgen.writeString(fooValue);
        }
        jgen.writeEndArray();
    }
}

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