Flutter FHIR REST客户端插件fhir_rest_client的使用

Flutter FHIR REST 客户端插件 fhir_rest_client 的使用

简介

fhir_rest_client 是一个用于与 FHIR (Fast Healthcare Interoperability Resources) 服务器进行交互的 Flutter 插件。它允许开发者通过 REST API 来创建、读取、更新和删除 FHIR 资源。

项目结构

为了演示如何使用 fhir_rest_client，我们将创建一个简单的 Flutter 应用程序。该项目的基本结构如下：

my_fhir_app/
├── lib/
│   ├── main.dart
│   └── fhir_service.dart
├── test/
│   └── fhir_service_test.dart
└── bin/
    └── run.dart

步骤 1: 添加依赖

首先，在 pubspec.yaml 文件中添加 fhir_rest_client 依赖：

dependencies:
  flutter:
    sdk: flutter
  fhir_rest_client: ^0.1.0

然后运行 flutter pub get 来安装依赖。

步骤 2: 创建 FHIR 服务类

在 lib/fhir_service.dart 中创建一个 FHIR 服务类来处理与 FHIR 服务器的交互。

import 'package:fhir_rest_client/fhir_rest_client.dart';

class FhirService {
  final client = FhirRestClient('https://your-fhir-server-url');

  Future<Resource?> readResource(String resourceType, String id) async {
    try {
      var response = await client.read(resourceType, id);
      return response;
    } catch (e) {
      print('Error reading resource: $e');
      return null;
    }
  }

  Future<Resource?> createResource(Resource resource) async {
    try {
      var response = await client.create(resource);
      return response;
    } catch (e) {
      print('Error creating resource: $e');
      return null;
    }
  }

  Future<Resource?> updateResource(Resource resource) async {
    try {
      var response = await client.update(resource);
      return response;
    } catch (e) {
      print('Error updating resource: $e');
      return null;
    }
  }

  Future<bool> deleteResource(String resourceType, String id) async {
    try {
      await client.delete(resourceType, id);
      return true;
    } catch (e) {
      print('Error deleting resource: $e');
      return false;
    }
  }
}

步骤 3: 使用 FHIR 服务类

在 lib/main.dart 中使用上面定义的 FhirService 类来执行 CRUD 操作。

import 'package:flutter/material.dart';
import 'fhir_service.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('FHIR Client Example')),
        body: Center(
          child: FhirClientExample(),
        ),
      ),
    );
  }
}

class FhirClientExample extends StatefulWidget {
  @override
  _FhirClientExampleState createState() => _FhirClientExampleState();
}

class _FhirClientExampleState extends State<FhirClientExample> {
  final fhirService = FhirService();
  Resource? resource;

  @override
  void initState() {
    super.initState();
    _fetchResource();
  }

  Future<void> _fetchResource() async {
    setState(() {
      resource = null;
    });
    var fetchedResource = await fhirService.readResource('Patient', '123');
    setState(() {
      resource = fetchedResource;
    });
  }

  Future<void> _createResource() async {
    var newResource = Patient(
      resourceType: 'Patient',
      name: [HumanName(family: 'Doe', given: ['John'])],
    );
    var createdResource = await fhirService.createResource(newResource);
    setState(() {
      resource = createdResource;
    });
  }

  Future<void> _updateResource() async {
    if (resource != null) {
      resource!.name![0].given![0] = 'Jane';
      var updatedResource = await fhirService.updateResource(resource!);
      setState(() {
        resource = updatedResource;
      });
    }
  }

  Future<void> _deleteResource() async {
    if (resource != null) {
      await fhirService.deleteResource('Patient', resource!.id!);
      setState(() {
        resource = null;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        ElevatedButton(
          onPressed: _fetchResource,
          child: Text('Fetch Resource'),
        ),
        ElevatedButton(
          onPressed: _createResource,
          child: Text('Create Resource'),
        ),
        ElevatedButton(
          onPressed: _updateResource,
          child: Text('Update Resource'),
        ),
        ElevatedButton(
          onPressed: _deleteResource,
          child: Text('Delete Resource'),
        ),
        SizedBox(height: 20),
        Text(resource?.toString() ?? 'No resource loaded'),
      ],
    );
  }
}

步骤 4: 运行应用程序

确保你已经启动了一个 FHIR 服务器，并且将 URL 替换为你的服务器地址。然后运行应用程序：

flutter run