我正在尝试读取一个简单的 Json 文件，但我保存了一个 null。 我究竟做错了什么？ 我的 json 仅包含 4 个字段

Question

Im trying to write a micrservice to read json using jackson mapper by using below code

      @Bean
    CommandLineRunner runner(ResponseService responseService) {
        return args -> {
            // read JSON and load json
            ObjectMapper mapper = new ObjectMapper();
            TypeReference<List<Response>> typeReference1 = new TypeReference<List<Response>>() {};
            InputStream inputStream1 = TypeReference.class.getResourceAsStream("/json/response.json");
            try {
                List<Response> responses = mapper.readValue(inputStream1, typeReference1);
                responseService.save(responses);
                System.out.println(responses);
                System.out.println("response saved");
            } catch (IOException e) {
                System.out.println("not saved" + e.getMessage());
            }

        };
    }

    @Service
public class ResponseService {
    private ResponseRepository responseRepository;

    public ResponseService(ResponseRepository responseRepository) {
        this.responseRepository = responseRepository;
    }

    public Iterable<Response> list() { return responseRepository.findAll();
    }

    public void save(List<Response> users) {
        responseRepository.saveAll(users);
    }
}

Answer 1

As you stated in comment your path is:

C:\Users\Desktop\spring-boot-jsontodb-master\src\main\resources\json\response.json

So instead of "/json/response.json" you should use: json/response.json

InputStream inputStream1 = TypeReference.class.getResourceAsStream("json/response.json");

just delete the first slash.