如何在Jackson ObectMapper中进行序列化时添加@JsonIgnore带注释的字段 [英] How to add @JsonIgnore annotated fields in serializing in Jackson ObectMapper

问题描述

在通过Jackson ObjectMapper序列化对象时，我需要添加带@JsonIgnore注释的字段.我知道您可以为我提供从类中删除@JsonIgnore批注的方法，但是我需要它们在我的应用程序的某些部分可忽略.在我的应用程序的另一部分中，我需要在我的json字符串中包含那些带有@JsonIgnore注释的字段.

I need to add @JsonIgnore annotated fields while serializing an object by Jackson ObjectMapper. I know you may offer me to remove the @JsonIgnore annotation from my class, but I need they are ignorable in some part of my application. And in another part of my application I need to have those @JsonIgnore annotated fields in my json string.

推荐答案

您可以定义SimpleBeanPropertyFilter和FilterProvider.

You can define a SimpleBeanPropertyFilter and FilterProvider.

首先使用此类自定义过滤器为您的课程添加注释:

First annotate your class with custom filter like this:

@JsonFilter("firstFilter")
public class MyDtoWithFilter {

    private String name;

    private String anotherName;
    private SecondDtoWithFilter dtoWith;

    // get set ....
}
 @JsonFilter("secondFilter")
public class SecondDtoWithFilter{
    private long id;
    private String secondName;
}

这就是您将动态序列化对象的方式.

and this is how you will dynamically serialise your object.

    ObjectMapper mapper = new ObjectMapper();

    // Field that not to be serialised. 
    SimpleBeanPropertyFilter firstFilter = SimpleBeanPropertyFilter.serializeAllExcept("anotherName");
     SimpleBeanPropertyFilter secondFilter = SimpleBeanPropertyFilter.serializeAllExcept("secondName");

    FilterProvider filters = new SimpleFilterProvider().addFilter("firstFilter", firstFilter).addFilter("secondFilter", secondFilter);

    MyDtoWithFilter dtoObject = new MyDtoWithFilter();
    String dtoAsString = mapper.writer(filters).writeValueAsString(dtoObject);

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