如何在mapstruct接口中注入guice依赖

Question

我的对象

 Public void Student(){
     private string name;
     private int age;
 }

Public void ClassRoom(){
   private string roomNo;
   private Student student; //Student Object
}

Public void School(){
   private string roomNo;
   private String student; //String student
}

我有一个界面

@Mapper(componentModel = "jsr330", unmappedTargetPolicy = ReportingPolicy.IGNORE, builder = @Builder(disableBuilder = true))
public interface TestjkMapper {

    @Named("convertObjToString")
    static String convertObjToString(Student student) {
        return new Gson.tojson(student)
    }

   @Mapping(source = "student", target = "student",qualifiedByName = "convertObjToString")
   School mapClassRoomToSchool(@NonNull ClassRoom classRoom);

}

我计划注入那个gson，而不是新的Gson()

根据此How can i combine Guice and Mapstruct?

我试图进行更改，但不确定要添加到哪里

@Inject
Gson gson

我试过这样

public interface TestjkMapper {

  @Inject
  Gson gson

    @Named("authorityToMap")
    static Map authorityToMap(Authority authority) {
        return gson.tojson(authority.tostring())
    }

}

我收到编译器错误，如下所示

variable gson might not have been initialized

如何正确地在接口内注入

这里也是

bind(TestjkMapper.class).to(TestjkMapperImpl.class)

TestjkMapper -我的界面

TestjkMapperImpl -这是在运行时生成的。所以不确定如何绑定这个

确切的问题：

如何使用guice injected gson将学生object转换为学生String

Answer 1

如果您希望在映射器中使用自定义注入组件，则需要使用抽象类而不是接口。您不能将字段注入到接口中。

在您的示例中，它将如下所示：

@Mapper(componentModel = "jsr330", unmappedTargetPolicy = ReportingPolicy.IGNORE, builder = @Builder(disableBuilder = true))
public abstract class TestjkMapper {

    @Inject
    Gson gson;

    @Named("convertObjToString")
    static String convertObjToString(Student student) {
        return gson.tojson(student)
    }

   @Mapping(source = "student", target = "student", qualifiedByName = "convertObjToString")
   School mapClassRoomToSchool(@NonNull ClassRoom classRoom);

}