Question

我正在开发一个与服务器通信的应用程序，并分别向网站发送数据，从该网站接收数据。数据大约是5个可选的时间表。

例如如果设置了3个时间表，并且我想取消其中一个时间表，它应该只向网站发送2个时间表。这是一个问题。

我分析了我的代码，并得出结论，问题出在将对象转换为JSON字符串的方法中。

以下是代码：

public class PriorityResponse {

    @JsonProperty("priority1")
    public Priority priorityOne;
    @JsonProperty("priority2")
    public Priority priorityTwo;
    @JsonProperty("priority3")
    public Priority priorityThree;
    @JsonProperty("priority4")
    public Priority priorityFour;
    @JsonProperty("priority5")
    public Priority priorityFive;

    public Priority getPriorityOne() {
        return priorityOne;
    }

    public Priority getPriorityTwo() {
        return priorityTwo;
    }

    public Priority getPriorityThree() {
        return priorityThree;
    }

    public Priority getPriorityFour() {
        return priorityFour;
    }

    public Priority getPriorityFive() {
        return priorityFive;
    }
   public String toJsonObject(){

         String jsonInString = "";
         ObjectMapper mapper = new ObjectMapper();
       //Object to JSON in String
         try {
             jsonInString = mapper.writeValueAsString(this);
         } catch (JsonProcessingException e) {
             e.printStackTrace();
         }

         return jsonInString;
     }
}

在这一行

jsonInString = mapper.writeValueAsString(this);

字符串为null，但是当返回jsonInString时，发送3时间表，而不是2。如果我进行其他更改，它会发送正确的数据，问题仅在我想取消选择一个或多个时间表时。

当我取消选择Priority4：

时，输出应该是这样的

{"priority5":{"number":null,"timeOut":null,"timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":false,"op":true},"fri":true,"mon":true,"sat":true,"sun":true,"thu":true,"tue":true,"wed":true}},"priority4":{"number":null,"timeOut":null,"timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":false,"op":true},"fri":true,"mon":true,"sat":true,"sun":true,"thu":true,"tue":true,"wed":true}},"priority1":{"number":"1234561231","timeOut":"9","timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":false,"op":true},"fri":true,"mon":true,"sat":false,"sun":false,"thu":true,"tue":true,"wed":true}},"priority3":{"number":"21515211545","timeOut":"","timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":true,"op":false},"fri":false,"mon":true,"sat":false,"sun":false,"thu":true,"tue":true,"wed":false}},"priority2":{"number":"789123156421","timeOut":"","timeTable":{"time":{"fh":"04","fm":"02","th":"13","tm":"07","cl":false,"op":false},"fri":true,"mon":true,"sat":true,"sun":true,"thu":true,"tue":true,"wed":true}}}

但是，看起来，当我取消选择一个优先级时，JSON字符串不会刷新，因为发送的优先级与我获得的优先级相同。这是发送的内容：

{"priority5":{"number":null,"timeOut":null,"timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":false,"op":true},"fri":true,"mon":true,"sat":true,"sun":true,"thu":true,"tue":true,"wed":true}},"priority4":{"number":"12233456545","timeOut":"6","timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":false,"op":true},"fri":true,"mon":true,"sat":false,"sun":false,"thu":true,"tue":true,"wed":true}},"priority1":{"number":"1234561231","timeOut":"9","timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":false,"op":true},"fri":true,"mon":true,"sat":false,"sun":false,"thu":true,"tue":true,"wed":true}},"priority3":{"number":"21515211545","timeOut":"5","timeTable":{"time":{"fh":null,"fm":null,"th":null,"tm":null,"cl":true,"op":false},"fri":false,"mon":true,"sat":false,"sun":false,"thu":true,"tue":true,"wed":false}},"priority2":{"number":"789123156421","timeOut":"5","timeTable":{"time":{"fh":"04","fm":"02","th":"13","tm":"07","cl":false,"op":false},"fri":true,"mon":true,"sat":true,"sun":true,"thu":true,"tue":true,"wed":true}}}

Answer 1

尝试使用com.google.gson.Gson如果任何属性为null，则解析器为

String jsonInString = new Gson().toJson(yourObject);

结果：

{
 "priorityOne":{},
 "priorityTwo":{},
  ...
}

Answer 2

将serializationInclusion设置为NON_NULL会为您提供所需内容吗？

"name"

使用Jackson

2 个答案: