Question

我试图在{"status":201}的情况下审核route!=0，但我得到{"status":201,"distance":0.0}我怎样才能与@JsonInclude或杰克逊达成"distance":0.0 }？

SDBean bean = new SDBean();
if (routeD != 0) {
    // Insert the data into the bus table
    bean.status = db.insertData(macD, routeD, latD, longD);

    return Response.status(bean.status).entity(bean.toJson()).build();

}

SDBean类：

@JsonInclude(JsonInclude.Include.NON_NULL)
public class SDBean {

    public int status;
    public ArrayList<Integer> routes;
    public double distance;

    public SDBean(){
    status = 230;
}

    public String toJson() {

        ObjectMapper mapper = new ObjectMapper();
        String json = null;
        try {
            json = mapper.writeValueAsString(this);
        } catch (JsonProcessingException e) {
            e.printStackTrace();

        }
         System.out.println(json);
        return json;
    }

}

Answer 1

使用Double。基元（double）不能为空（它们具有默认值）

@JsonInclude（JsonInclude.Include.NON_NULL不适用于double

1 个答案: