Java 如何将JpaRepository结果转换为自定义DTO类

我想一页一页地转换

所以我就这样实现了

@GetMapping("/history")
public Page<ResponseAllHistoryDto> getAllHistory() {
    Pageable pageable = PageRequest.of(0, 20, Sort.by("createdAt"));
    Page<History> histories = historyRepository.findAll(pageable);
    return histories.map(history -> {
       return ResponseAllHistoryDto.builder()
               .history(history)
               .tags(tagRepository.findByHistoryHistoryId(history.getHistoryId()))
               .auths(authRepository.findByHistoryHistoryId(history.getHistoryId()))
               .build();
    });
}

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问题是什么……（

您的

DTO

类需要一个默认构造函数、getter和setter。请尝试使用lombok的

@Data

对其进行注释

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class com.wrapsody.demo.ResponseAllHistoryDto and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: org.springframework.data.domain.PageImpl["content"]->java.util.Collections$UnmodifiableRandomAccessList[0])