Jackson 将 POJO 序列化为 JS 对象

Question

class Foo {
  String name = "Bar";
}

Serialising the above object using ObjectMapper().convertValue(foo, JsonNode::class) will return JSON object as:

{
  "name": "Bar"
}

my desired result however is:

{
  name: "Bar"
}  

I have tried a custom serialiser but it always writes keys as strings. Is there a way to serialise my POJO in this format using Jackson or any of it's annotation to avoid a substituting chars or building the string my self.

Answer 1

Beside the fact that your "JSON" will not be valid anymore you can disable JsonGenerator.Feature.QUOTE_FIELD_NAMES in your ObjectMapper .

ObjectMapper mapper = new ObjectMapper()
        .disable(JsonGenerator.Feature.QUOTE_FIELD_NAMES);

The result of mapper.writeValueAsString(new Foo()) will be:

{name:"Bar"}

To enable pretty print you can use either:

ObjectMapper mapper = new ObjectMapper()
        .disable(JsonGenerator.Feature.QUOTE_FIELD_NAMES)
        .enable(SerializationFeature.INDENT_OUTPUT);

Or use this in the output step:

String result = mapper
        .writerWithDefaultPrettyPrinter()
        .writeValueAsString(new Foo());

The result in both cases will be:

{
  name : "Bar"
}