java - ObjectMapper 的两个实例

Question

有没有办法为不同的目的创建两个 ObjectMapper 实例。

修改后的 ObjectMapper

    @Component
    class MyObjectMapper extends ObjectMapper{
      public MyObjectMapper(){
        super();
      }

    public MyObjectMapper(MyObjectMapper om) {
        super(om);
     }

    @Override
    public MyObjectMapper copy() {
        return new MyObjectMapper(this);
     }
   }

现在使用如下

@Autowired ObjectMapper objectMapper; //performs standard serialization
@Autowire MyObjectMapper myMapper; //i can add custom filters in thiis mapper.

我尝试了类似的设置，但自定义映射器实际上影响了原始映射器，所有 rest controllers 抛出 JSON 解析错误:无法识别的字段

编辑: 不确定这一点是否很重要但仍然添加它 我正在使用 spring-boot-starter-json

Answer 1

这正是您应该使用 @Qualifier 的地方注释。

This annotation may be used on a field or parameter as a qualifier for candidate beans when autowiring. It may also be used to annotate other custom annotations that can then in turn be used as qualifiers.