Flutter邮件解析插件flutter_eml_parse的使用

发布于 1周前 作者 nodeper 来自 Flutter

Flutter邮件解析插件flutter_eml_parse的使用

本包是 eml-parse-js 的一个端口，用于读取并解析以纯文本格式保存的EML邮件。它还能够从已保存的消息中读取附件。

特性

  • 解析并读取EML消息及其附件。

开始使用

在Android或iOS的Flutter应用中包含此库。为了进行编码和解码，它使用了 charset_converter 包，该包仅在应用程序环境中工作。

使用方法

请参阅示例代码。

String eml = await File('./sample.eml').readAsString();

EmlParseResult result = await parseEml(eml);

print(result.from?.email);
print(result.to?.email);
print(result.subject);
print(result.text);
print(result.html);

if (result.attachments != null && result.attachments!.isNotEmpty) {
  for (EmlEmailAttachment attachment in result.attachments!) {
    print(
        'Attachment: ${attachment.name} ${attachment.contentType} ${attachment.data.length}');
  }
}

示例代码

以下是一个完整的示例代码：

import 'dart:io';

import 'package:flutter/material.dart';
import 'package:flutter_eml_parse/src/data_classes.dart';
import 'package:flutter_eml_parse/src/parser.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  [@override](/user/override)
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: FutureBuilder<EmlParseResult>(
          future: _readEml(),
          builder: (context, snapshot) {
            if (snapshot.hasData) {
              return Column(
                children: <Widget>[
                  Text('From: ${snapshot.data!.from}'),
                  Text('To: ${snapshot.data!.to}'),
                  Text('Subject: ${snapshot.data!.subject}'),
                  Text('Text: ${snapshot.data!.text}'),
                  Text('Html: ${snapshot.data!.html}'),
                ],
              );
            } else {
              return const CircularProgressIndicator();
            }
          },
        ),
      ),
    );
  }

  Future<EmlParseResult>? _readEml() async {
    String eml = await File('./sample.eml').readAsString();

    EmlParseResult result = await parseEml(eml);

    print('From: ${result.from}');
    print('To: ${result.to}');
    print('Subject: ${result.subject}');
    print('Text: ${result.text}');
    print('Html: ${result.html}');

    if (result.attachments != null && result.attachments!.isNotEmpty) {
      for (EmlEmailAttachment attachment in result.attachments!) {
        print(
            'Attachment: ${attachment.name} ${attachment.contentType} ${attachment.data.length}');
      }
    }

    if (result.headers != null && result.headers!.isNotEmpty) {
      for (EmlEmailHeader header in result.headers!) {
        print('${header.name}: ${header.value}');
      }
    }
    return result;
  }
}

更多关于Flutter邮件解析插件flutter_eml_parse的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html

1 回复

更多关于Flutter邮件解析插件flutter_eml_parse的使用的实战系列教程也可以访问 https://www.itying.com/category-92-b0.html


当然，下面是一个关于如何使用Flutter邮件解析插件flutter_eml_parse的代码案例。这个插件可以帮助你解析EML格式的邮件文件，提取邮件的各种信息，如发件人、收件人、主题、正文等。

首先，确保你已经在pubspec.yaml文件中添加了flutter_eml_parse依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_eml_parse: ^最新版本号  # 请替换为实际最新版本号

然后，运行flutter pub get来安装依赖。

接下来，你可以使用以下代码来解析EML文件：

import 'package:flutter/material.dart';
import 'package:flutter_eml_parse/flutter_eml_parse.dart';
import 'dart:typed_data';
import 'dart:convert';
import 'package:path_provider/path_provider.dart';

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String? emailSubject;
  String? emailFrom;
  String? emailTo;
  String? emailBody;

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

  Future<void> _loadAndParseEmail() async {
    // 假设你有一个EML文件作为字节数据
    Uint8List emlData = Uint8List.fromList(utf8.encode('''
      --boundary_123456789
      Content-Type: text/plain; charset="UTF-8"
      Content-Transfer-Encoding: 7bit

      This is the email body.
      --boundary_123456789
      Content-Type: application/rfc822; name="email.eml"
      Content-Transfer-Encoding: base64
      Content-Disposition: attachment; filename="email.eml"

      SGVsbG8sIHdvcmxkIQ==
      --boundary_123456789--
    '''.replaceAll('\n', '\r\n').codeUnits)); // 注意：EML格式通常使用\r\n作为换行符

    // 使用flutter_eml_parse解析EML数据
    Email email = Email.fromBytes(emlData);

    // 更新UI状态
    setState(() {
      emailSubject = email.subject;
      emailFrom = email.from.firstOrNull?.address;
      emailTo = email.to.firstOrNull?.address;
      emailBody = email.plainTextBody;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter EML Parse Example'),
        ),
        body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('Subject:', style: TextStyle(fontWeight: FontWeight.bold)),
              Text(emailSubject ?? 'Loading...'),
              SizedBox(height: 16),
              Text('From:', style: TextStyle(fontWeight: FontWeight.bold)),
              Text(emailFrom ?? 'Loading...'),
              SizedBox(height: 16),
              Text('To:', style: TextStyle(fontWeight: FontWeight.bold)),
              Text(emailTo ?? 'Loading...'),
              SizedBox(height: 16),
              Text('Body:', style: TextStyle(fontWeight: FontWeight.bold)),
              Text(emailBody ?? 'Loading...'),
            ],
          ),
        ),
      ),
    );
  }
}

注意：

  1. 上面的EML数据只是一个示例，实际EML文件会复杂得多。
  2. email.from.firstOrNull?.address 和 email.to.firstOrNull?.address 是为了安全访问列表中的第一个元素，如果列表为空则返回null。你需要根据实际需求调整这些代码。
  3. flutter_eml_parse插件的具体API可能会随着版本更新而变化，请参考其官方文档和源码以获取最新和最准确的使用方式。

这段代码展示了如何加载EML数据并使用flutter_eml_parse插件解析它，然后将解析结果显示在Flutter应用的UI上。

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