@JsonPropertyOrder不使用jackson-module-jsonSchema

Question

我正在使用Jackson模块的最新分支 - jackson-module-jsonSchema即2.4.4-Snapshot.

我正在尝试使用@JsonPropertyOrder注释来维护POJO属性的顺序,但它似乎不尊重注释.

我的样本POJO如下 -

import com.fasterxml.jackson.annotation.JsonPropertyOrder;

@JsonPropertyOrder({"a", "b"})
class Pojo {
    private String a;
    private String b;

    public Pojo(final String a, final String b) {
        this.a = a;
        this.b = b;
    }

    public void setA(final String a) {
        this.a = a;
    }

    public void setB(final String b) {
        this.b = b;
    }

    public String getA() {
        return this.a;
    }

    public String getB() {
        return this.b;
    }
}

杰克逊代码如下 -

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.module.jsonSchema.JsonSchema;
import com.fasterxml.jackson.module.jsonSchema.factories.SchemaFactoryWrapper;

public class Test {

    public static void main(String[] args) throws JsonProcessingException {
        // TODO Auto-generated method stub
        final ObjectMapper mapper = new ObjectMapper();
        final SchemaFactoryWrapper visitor = new SchemaFactoryWrapper();
        mapper.acceptJsonFormatVisitor(mapper.constructType(Pojo.class), visitor);
        final JsonSchema jsonSchema = visitor.finalSchema();            
        System.out.println(mapper.writeValueAsString(jsonSchema));
    }

}

Json输出如下 -

{
    "type": "object",
    "id": "urn:jsonschema:Pojo",
    "properties": {
        "b": {
            "type": "string"
        },
        "a": {
            "type": "string"
        }
    }
}

有人可能会建议我做错了什么或者我们是否需要在杰克逊面前打开一个问题,因为我看到这个问题已经在2.3.2中关闭了(https://github.com/FasterXML/jackson- dataformat-xml/issues/91)？

Answer 1

使用 @JsonPropertyOrder(alphabetic=true) 这将按字母顺序对所有属性进行排序 适用于 Jackson 1.9.13