如果不是一開始就是以FHIR為標準設計的服務(FHIR-based)，在對接FHIR時就需要將資料轉為fhir-json格式，因此今天會介紹將數據轉成fhir-json格式回傳的方法，範例會以SpringBoot框架進行開發。

版本

以下是POM檔內需要import的dependency。

        <!--  FHIR版本為R4-->
        <!-- https://mvnrepository.com/artifact/ca.uhn.hapi.fhir/hapi-fhir-structures-r4  -->
        <dependency>
            <groupId>ca.uhn.hapi.fhir</groupId>
            <artifactId>hapi-fhir-structures-r4</artifactId>
            <version>7.2.1</version>
        </dependency>

        <!--  FHIR Base-->
        <!-- https://mvnrepository.com/artifact/ca.uhn.hapi.fhir/hapi-fhir-base -->
        <dependency>
            <groupId>ca.uhn.hapi.fhir</groupId>
            <artifactId>hapi-fhir-base</artifactId>
            <version>7.2.1</version>
        </dependency>

引入dependency後就能進行開發啦!接下來以血糖量測數值(Observation Resource)舉例

public String fhirObservationBloodGlucose(String patientID,String bloodGlucose){

        
        //         新增一個 Observation 物件，並將資料置入其中
        Observation bloodGlucoseObservation = new Observation();
//                bloodGlucoseObservation.addCategory().addCoding().setDisplay("Vital Signs").setSystem("http://terminology.hl7.org/CodeSystem/observation-category").setCode("vital-signs");
//                bloodGlucoseObservation.addCategory().setText("Vital Signs");
        CodeableConcept bloodGlucoseCode = new CodeableConcept();
    // 填入血糖基本資料
        bloodGlucoseCode.addCoding().setSystem("http://loinc.org").setCode("15074-8").setDisplay("Glucose [Moles/volume] in Blood");
        bloodGlucoseCode.setText("Glucose [Moles/volume] in Blood");
        bloodGlucoseObservation.setCode(bloodGlucoseCode);
        Quantity bloodGlucoseQty = new Quantity();
        bloodGlucoseQty.setValue(Double.parseDouble(bloodGlucose)).setSystem("http://unitsofmeasure.org").setCode("mmol/L").setUnit("mmol/l");
        bloodGlucoseObservation.setValue(bloodGlucoseQty);
//        如果要紀錄此量測數據是屬於哪個Patient，可以新增以下Reference
//        Reference ref = new Reference();
//        ref.setReference("Patient/"+patientID);
//        observation.setSubject(ref);

        //         將Observation 物件轉成String
        String bloodGlucoseObservationstr = FhirContext.forR4().newJsonParser().encodeResourceToString(bloodGlucoseObservation);

        //         回傳fhir+JSON格式資料
        return bloodGlucoseObservationstr;
    }

如果是像血壓這種會一次產生兩種測量數值的Observation Resource，則需要新增兩個Quantity

    
    public String fhirObservationBloodPressure(String patientID,String bp_dp,String bp_sp) {

        //         新增一個 Observation 物件，並將資料置入其中
        Observation bloodPressureObservation = new Observation();
        bloodPressureObservation.addCategory().addCoding().setDisplay("Vital Signs").setSystem("http://terminology.hl7.org/CodeSystem/observation-category").setCode("vital-signs");
        bloodPressureObservation.addCategory().setText("Vital Signs");
        CodeableConcept bloodPressureCode = new CodeableConcept();
        bloodPressureCode.addCoding().setSystem("http://loinc.org").setCode("85354-9").setDisplay("Blood pressure panel with all children optional");
        bloodPressureCode.setText("Blood pressure systolic & diastolic");
        bloodPressureObservation.setCode(bloodPressureCode);
        CodeableConcept bloodPressureSysCode = new CodeableConcept();
        bloodPressureSysCode.addCoding().setSystem("http://loinc.org").setCode("8480-6").setDisplay("Systolic blood pressure");
        Quantity bloodPressureSysQty = new Quantity();
        bloodPressureSysQty.setValue(Integer.parseInt(bp_sp)).setSystem("http://unitsofmeasure.org").setCode("mm[Hg]").setUnit("mmHg");
        bloodPressureObservation.addComponent().setCode(bloodPressureSysCode).setValue(bloodPressureSysQty);
        CodeableConcept bloodPressureDiasCode = new CodeableConcept();
        bloodPressureDiasCode.addCoding().setSystem("http://loinc.org").setCode("8462-4").setDisplay("Diastolic blood pressure");
        Quantity bloodPressureDiasQty = new Quantity();
        bloodPressureDiasQty.setValue(Integer.parseInt(bp_dp)).setSystem("http://unitsofmeasure.org").setCode("mm[Hg]").setUnit("mmHg");
        bloodPressureObservation.addComponent().setCode(bloodPressureDiasCode).setValue(bloodPressureDiasQty);
//        跟上面範例一樣，如果要標記這個Observation Resource的Reference，需要將Reference加入Observation 物件裡 
//        Reference ref = new Reference();
//        ref.setReference("Patient/"+patientID);
//        observation.setSubject(ref);

        //         將Observation 物件轉成String
        String bloodPressureObservationstr = FhirContext.forR4().newJsonParser().encodeResourceToString(bloodPressureObservation);

        //         回傳fhir+JSON格式資料
        return bloodPressureObservationstr;
    }

後續只需要在Controller部分限定回傳的是JSON格式，就可以回傳fhir+JSON格式資料啦!

接下來會介紹關於醫療影像儲存及檔案的內容，敬請期待!