Spring boot 带有条件和nullValuePropertyMappingStrategy的Mapstruct映射

如果标题不清楚，我深表歉意，让我通过给出示例代码来说明：

UpdateProfileDto

public class UpdateProfileDto {

    @NotEmpty
    private String firstName;

    @NotEmpty
    private String lastName;

    @Size(max = 20)
    private String currentPassword;

    @Size(max = 20)
    private String newPassword;

    @Size(max = 20)
    private String confirmNewPassword;

    // getters and setters
}

编码映射

@Qualifier
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.CLASS)
public @interface EncodedMapping {
}

PasswordEncoderMapper

public class PasswordEncoderMapper {
    protected final PasswordEncoder passwordEncoder;

    public PasswordEncoderMapper(PasswordEncoder passwordEncoder) {
        this.passwordEncoder = passwordEncoder;
    }

    @EncodedMapping
    public String encode(String value) {
        return passwordEncoder.encode(value);
    }
}

@Mapper(config = MapperConfig.class, componentModel = "spring", uses = PasswordEncoderMapper.class)
public interface UserMapper {

    @Mappings({
            @Mapping(target = "firstName", source = "firstName"),
            @Mapping(target = "lastName", source = "lastName"),
            @Mapping(target = "fullName", expression = "java(user.getFirstName() + \" \" + user.getLastName())"),
            @Mapping(target = "password",
                    source = "newPassword",
                    nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE,
                    qualifiedBy = EncodedMapping.class)
    })
    void updateUserFromDto(UpdateUserProfileDto updateUserProfileDto, @MappingTarget User user);
}

UserMapper

public class PasswordEncoderMapper {
    protected final PasswordEncoder passwordEncoder;

    public PasswordEncoderMapper(PasswordEncoder passwordEncoder) {
        this.passwordEncoder = passwordEncoder;
    }

    @EncodedMapping
    public String encode(String value) {
        return passwordEncoder.encode(value);
    }
}

@Mapper(config = MapperConfig.class, componentModel = "spring", uses = PasswordEncoderMapper.class)
public interface UserMapper {

    @Mappings({
            @Mapping(target = "firstName", source = "firstName"),
            @Mapping(target = "lastName", source = "lastName"),
            @Mapping(target = "fullName", expression = "java(user.getFirstName() + \" \" + user.getLastName())"),
            @Mapping(target = "password",
                    source = "newPassword",
                    nullValuePropertyMappingStrategy = NullValuePropertyMappingStrategy.IGNORE,
                    qualifiedBy = EncodedMapping.class)
    })
    void updateUserFromDto(UpdateUserProfileDto updateUserProfileDto, @MappingTarget User user);
}

生成的UserMapperImpl

@Generated(
    value = "org.mapstruct.ap.MappingProcessor",
    date = "2020-03-11T13:51:34+0800",
    comments = "version: 1.3.0.Final, compiler: javac, environment: Java 1.8.0_231 (Oracle Corporation)"
)
@Component
public class UserMapperImpl implements UserMapper {

    @Autowired
    private PasswordEncoderMapper passwordEncoderMapper;

    @Override
    public void updateUserFromDto(UpdateUserProfileDto updateUserProfileDto, User user) {
        if ( updateUserProfileDto == null ) {
            return;
        }

        if ( updateUserProfileDto.getFirstName() != null ) {
            user.setFirstName( updateUserProfileDto.getFirstName() );
        }
        else {
            user.setFirstName( null );
        }
        if ( updateUserProfileDto.getLastName() != null ) {
            user.setLastName( updateUserProfileDto.getLastName() );
        }
        else {
            user.setLastName( null );
        }
        if ( updateUserProfileDto.getNewPassword() != null ) {
            user.setPassword( passwordEncoderMapper.encode( updateUserProfileDto.getNewPassword() ) );
        }

        user.setFullName( user.getFirstName() + " " + user.getLastName() );
    }
}

从生成的

UserMapperImpl

，我想检查的不仅仅是

newPassword

是否有值。。。但是要检查

currentPassword

和

newPassword

是否有值，请继续执行

user.setPassword（）

我的意思是这样的：

...
if ( updateUserProfileDto.getCurrentPassword() != null && updateUserProfileDto.getNewPassword() != null ) {
    user.setPassword( passwordEncoderMapper.encode( updateUserProfileDto.getNewPassword() ) );
}
...

问题

如何更改映射器界面

UserMapper

，以便在设置目标

user.password

之前检查

currentPassword

和

newPassword

，并且仍然使用

PasswordEncoderMapper.encode（password）

如果我尝试使用

expression

而不是

source

，并检查

currentPassword

和

newPassword

是否都有值，然后将

user.password

设置为

newPassword

。否则，它将不会使用

NullValuePropertyMappingStrategy

对

user.password

执行任何操作。。。但似乎不允许混合使用

表达式

和

空值属性映射策略

---

谢谢

我将从以下方法开始

@Mapper（config=MapperConfig.class，componentModel=“spring”）
公共抽象类UserMapper{//使用类而不是接口来注入bean
@自动连线
私有密码编码器映射器密码编码器映射器；
@映射({
//您的非密码映射
})
void updateUserFromDto（UpdateUserProfileDto UpdateUserProfileDto，@MappingTarget User）；
@后映射
void setPassword（UpdateUserProfileDto UpdateUserProfileDto，@MappingTarget User）{
if（updateUserProfileDto.getCurrentPassword（）！=null&&updateUserProfileDto.getNewPassword（）！=null）{
user.setPassword（passwordEncoderMapper.encode（updateUserProfileDto.getNewPassword（））；
}
}
}

还可以为新密码添加状态检查，以检查当前密码和新密码。这样，MapStruct将使用状态检查。