java - @JsonIgnoreProperties 用于参数的动态数量

Question

我想忽略一些属性(我从 UI 获得的)，比如

过滤值 0、过滤值 1、过滤值 2 等

但是我确实从 UI 中得到了这个计数

即如果过滤器计数 = 3我知道，会有过滤值0、过滤值1、过滤值2

是否可以动态地进行这项工作(即@JsonIgnoreProperties)

Answer 1

您可以使用@JsonFilter 动态过滤字段以Serialization 或Deserialization。

例如:

@JsonFilter("myFilter")
static class Bean {
    public String filtervalue0 = "a";
    public String filtervalue1 = "b";
    public int filtercount = 1;
    public int totalFilters = 2;
}

static void test() throws JsonProcessingException{
    Bean value = new Bean();
    ObjectMapper mapper = new ObjectMapper();
    Set<String> filtersToExclude = new HashSet<>();

    //logic for applying filter
    for(int i=value.totalFilters-1; i>value.totalFilters-value.filtercount-1; i--){
        filtersToExclude.add("filtervalue"+i);
    }

   //dynamic field filtering is provided by FilterProvider
    FilterProvider filters = new SimpleFilterProvider().addFilter("myFilter",
        SimpleBeanPropertyFilter.filterOutAllExcept(filtersToExclude));
    String json = mapper.setFilterProvider(filters).writeValueAsString(value);
    System.out.println(json); // prints {"filtervalue1":"b"}
}

public static void main(String[] args) throws JsonProcessingException {
    test();
}