Flutter随机密码生成插件random_password_generator的使用

插件简介

random_password_generator 是一个适用于Android、iOS以及Web端的新Flutter包，它可以帮助用户为在线账户生成强密码，并提供密码强度评估功能。

使用方法

导入包

在使用此插件之前，请确保已经在项目的pubspec.yaml文件中添加了对random_password_generator的依赖。然后，在Dart文件顶部导入该库：

import 'package:random_password_generator/random_password_generator.dart';

生成随机密码

通过创建RandomPasswordGenerator类的一个实例来开始使用这个插件。你可以调用它的randomPassword()方法生成包含指定字符类型的密码。

final password = RandomPasswordGenerator();

// 参数含义依次为：小写字母、大写字母、数字、特殊字符、密码长度
String newPassword = password.randomPassword(true, false, true, false, 6);

检查密码强度

使用checkPassword()方法可以获取给定密码的强度评分（返回值介于0到1之间）。根据分数的不同，我们可以给出不同的提示信息。

double passwordstrength = password.checkPassword('hello');

if (passwordstrength < 0.3) 
    print('This password is weak!');
else if (passwordstrength < 0.7)
    print('This password is Good');
else
    print('This passsword is Strong');

示例代码

下面是一个完整的Flutter应用示例，演示了如何使用random_password_generator插件生成随机密码并显示其强度。

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

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

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

class _MyAppState extends State<MyApp> {
  bool _isWithLetters = true;
  bool _isWithUppercase = false;
  bool _isWithNumbers = false;
  bool _isWithSpecial = false;
  double _numberCharPassword = 8;
  String newPassword = '';
  Color _color = Colors.blue;
  String isOk = '';
  TextEditingController _passwordLength = TextEditingController();
  final password = RandomPasswordGenerator();

  checkBox(String name, Function onTap, bool value) {
    return Row(
      mainAxisAlignment: MainAxisAlignment.center,
      children: <Widget>[
        Text(name),
        Checkbox(value: value, onChanged: onTap),
      ],
    );
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Random Password Generator'),
        ),
        body: Center(
          child: Column(
            children: [
              SizedBox(height: 10),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: [
                  checkBox('Upper Case', (bool value) {
                    _isWithUppercase = value;
                    setState(() {});
                  }, _isWithUppercase),
                  checkBox('Lower Case', (bool value) {
                    _isWithLetters = value;
                    setState(() {});
                  }, _isWithLetters)
                ],
              ),
              SizedBox(height: 10),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceAround,
                children: [
                  checkBox('Symbols', (bool value) {
                    _isWithSpecial = value;
                    setState(() {});
                  }, _isWithSpecial),
                  checkBox('Numbers', (bool value) {
                    _isWithNumbers = value;
                    setState(() {});
                  }, _isWithNumbers)
                ],
              ),
              SizedBox(height: 20),
              Padding(
                padding: const EdgeInsets.all(15.0),
                child: TextField(
                  controller: _passwordLength,
                  decoration: InputDecoration(
                    border: OutlineInputBorder(
                      borderRadius: BorderRadius.circular(25.0),
                      borderSide: BorderSide(),
                    ),
                    filled: true,
                    fillColor: Colors.grey[300],
                    labelText: 'Enter Length',
                    labelStyle: TextStyle(color: Colors.blue),
                  ),
                  keyboardType: TextInputType.number,
                ),
              ),
              SizedBox(height: 20),
              FlatButton(
                onPressed: () {
                  if (_passwordLength.text.trim().isNotEmpty)
                    _numberCharPassword = double.parse(_passwordLength.text.trim());

                  newPassword = password.randomPassword(
                    letters: _isWithLetters,
                    numbers: _isWithNumbers,
                    passwordLength: _numberCharPassword,
                    specialChar: _isWithSpecial,
                    uppercase: _isWithUppercase,
                  );

                  print(newPassword);
                  double passwordstrength = password.checkPassword(password: newPassword);
                  if (passwordstrength < 0.3) {
                    _color = Colors.red;
                    isOk = 'This password is weak!';
                  } else if (passwordstrength < 0.7) {
                    _color = Colors.blue;
                    isOk = 'This password is Good';
                  } else {
                    _color = Colors.green;
                    isOk = 'This passsword is Strong';
                  }

                  setState(() {});
                },
                child: Container(
                  color: Colors.red,
                  child: Padding(
                    padding: const EdgeInsets.all(8.0),
                    child: Text(
                      'Generate Password',
                      style: TextStyle(color: Colors.white, fontSize: 20),
                    ),
                  ),
                ),
              ),
              SizedBox(height: 10),
              if (newPassword.isNotEmpty && newPassword != null)
                Center(
                  child: SingleChildScrollView(
                    child: Padding(
                      padding: const EdgeInsets.all(8.0),
                      child: Text(
                        isOk,
                        style: TextStyle(color: _color, fontSize: 25),
                      ),
                    ),
                  ),
                ),
              if (newPassword.isNotEmpty && newPassword != null)
                Center(
                  child: SingleChildScrollView(
                    child: Padding(
                      padding: const EdgeInsets.all(8.0),
                      child: Text(
                        newPassword,
                        style: TextStyle(color: _color, fontSize: 25),
                      ),
                    ),
                  ),
                )
            ],
          ),
        ),
      ),
    );
  }
}

以上就是关于random_password_generator插件的基本介绍和使用方法，希望对你有所帮助！如果你有任何问题或需要进一步的帮助，请随时提问。