我有一个 Java 实现 Override 方法,它根据输入的参数从 2 个微服务返回 DTO 对象结果。
我能够获得过滤的搜索结果,但是在不满足第二个服务条件的情况下我收到“空”我希望获得不返回空对象的结果。我如何能够返回满足所有条件的结果指定参数?
下面我提供了我使用“Swagger”收到的响应的屏幕截图以及执行所有魔力的代码片段。
我是否需要使用 ObjectMapper 或类似 @JsonInclude(Include.NON_NULL)
的东西,但是我可以在服务植入中和 DTO 对象中使用它吗?
任何进一步的建议或想法弹跳将不胜感激。
我在之前的问题 Java pass variable into mapped DTO method? 的基础上进一步发展
招摇回应:
代码片段:
@Override
public Page<ProfileCreditDTO> findProfileBySelectedParameters(String username, Integer gender, Integer profileType, Integer orientation, Boolean online, Double profileCredit, Integer creditMode, Double creditTotal, Pageable pageable) {
Page<Profile> searchData= profileRepository.findByAllParameters(username, gender, profileType, orientation, online, pageable);
Page<ProfileCreditDTO> searchProfileData=null;
if(searchData != null)
searchProfileData = searchData.map(x -> this.convertProfileToProfileCreditDTO(x, profileCredit, creditMode, creditTotal));
return searchProfileData;
}
public ProfileCreditDTO convertProfileToProfileCreditDTO(final Profile theProfile, Double profileCredit, Integer creditMode, Double creditTotal) {
if(theProfile == null)
return null;
ProfileCreditDTO theDTO= new ProfileCreditDTO();
theDTO.setProfile(theProfile);
CreditDTO theCreditDto = profileCreditClient.findClientByProfileId(theProfile.getId(), profileCredit, creditMode, creditTotal);
log.error(String.valueOf(theCreditDto));
if (theCreditDto != null)
theDTO.setCredit(theCreditDto);
else {
return null;
}
return theDTO;
}
已更新
我尝试将 @JsonInclude(Ininclude.NON_NULL)
添加到 ProfileCredit DTO 中,但仍然没有任何结果,也在 CreditDTO 中添加了相同的内容。
ProfileCredit DTO:
@Data
@AllArgsConstructor
@NoArgsConstructor
@ToString
@JsonInclude(JsonInclude.Include.NON_NULL)
public class ProfileCreditDTO {
// profile fields
private Long profileId;
@Size(min = 2, max = 50)
private String username;
private Integer gender;
private Integer profileType;
private Integer orientation;
private boolean online;
// Credit fields
private Long creditId;
@Column(unique = true)
private Double profileCredit; //X
private Integer creditMode;
private Integer creditCheck;
private Double creditTotal;
/**
* set the profile derived data
* @param profile
*/
public void setProfile(final Profile profile){
this.setProfileId(profile.getId());
this.setUsername(profile.getUsername());
this.setGender(profile.getGender());
this.setProfileType(profile.getProfileType());
this.setOrientation(profile.getOrientation());
this.setOnline(profile.isOnline());
}
/**
* Set the credit aspect
* @param credit
*/
public void setCredit(final CreditDTO credit){
this.setCreditId(credit.getId());
this.setProfileId(credit.getProfileId());
this.setProfileCredit(credit.getProfileCredit());
this.setCreditMode(credit.getCreditMode());
this.setCreditTotal(credit.getCreditTotal());
}
当我在实现中未指定 return null;
时,响应如下所示。正如您所看到的,所有满足条件 1 但不满足条件 2 的对象都会返回空对象字段。
最佳答案
作为元素的“对象”不能直接从页面中删除。您可以做的是,从页面中获取内容,该内容将是一个列表,然后根据您的条件从列表中删除元素,然后使用页面所需的数据字段创建一个新页面。
而不是
@Override
public Page<ProfileCreditDTO> findProfileBySelectedParameters(String username, Integer gender, Integer profileType, Integer orientation, Boolean online, Double profileCredit, Integer creditMode, Double creditTotal, Pageable pageable) {
Page<Profile> searchData= profileRepository.findByAllParameters(username, gender, profileType, orientation, online, pageable);
Page<ProfileCreditDTO> searchProfileData=null;
if(searchData != null)
searchProfileData = searchData.map(x -> this.convertProfileToProfileCreditDTO(x, profileCredit, creditMode, creditTotal));
return searchProfileData;
}
尝试
@Override
public Page<ProfileCreditDTO> findProfileBySelectedParameters(String username, Integer gender, Integer profileType, Integer orientation, Boolean online, Double profileCredit, Integer creditMode, Double creditTotal, Pageable pageable) {
Page<Profile> searchData= profileRepository.findByAllParameters(username, gender, profileType, orientation, online, pageable);
Page<ProfileCreditDTO> searchProfileData=null;
if(searchData != null)
searchProfileData = searchData.map(x -> this.convertProfileToProfileCreditDTO(x, profileCredit, creditMode, creditTotal));
List modifiedAppList = searchProfileData.getContent().stream().filter(v -> v !=null).collect(Collectors.toList()); //Will filter your search result and put it into a list
Page<ProfileCreditDTO> filteredList = new PageImpl<>(modifiedAppList, new PageRequest(0, searchProfileData.getSize()), searchProfileData.getTotalElements()); //Will put your filtered list back into page
return filteredList; //Returns filtered result
}
从 Spring Data Rest - How to remove an element from a Page? 得到了这个问题的答案仅修改了代码和措辞的位,因为答案已经正确了;)
关于如果为 null,Java Spring 不会返回 DTO 对象?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/59326842/