团队作业博客（五）flutter 结合 springBoot 完成登录 注册 功能

后端接口

 前端调用接口代码

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import 'package:dio/dio.dart'; import 'package:flutter/material.dart';   import '../page/login.dart';     //注册功能 Future<void> register(     BuildContext context,     String username,     String password,     String username2,     String phoneNumber,     String email) async {   try {     Dio dio = Dio();     String checkUrl = "http://192.168.95.241:9090/user/checkUserNameExistence?userName=$username";     Response checkResponse = await dio.get(checkUrl);       if (checkResponse.data) {       // 用户名已存在，提示用户无法注册       showDialog(         context: context,         builder: (BuildContext context) {           return AlertDialog(             title: Text('注册失败'),             content: Text('用户名已存在，请选择其他用户名'),             actions: <Widget>[               TextButton(                 onPressed: () {                   Navigator.of(context).pop(); // 关闭对话框                 },                 child: Text('确定'),               ),             ],           );         },       );       return;     }       // 用户名不存在，可以进行注册     String registerUrl = "http://192.168.95.241:9090/user";     Map<String, dynamic> data = {       "user_name": username,       "user_password": password,       "user_name2": username2,       "user_phone": phoneNumber,       "user_email": email     };     Response response = await dio.post(registerUrl, data: data);       if (response.statusCode == 200) {       // 注册成功       showDialog(         context: context,         builder: (BuildContext context) {           return AlertDialog(             title: Text('注册成功'),             actions: <Widget>[               TextButton(                 onPressed: () {                   Navigator.of(context).pop(); // 关闭对话框                   Navigator.of(context).pushReplacement( // 替换当前页面为登录页面                     MaterialPageRoute(builder: (context) => LoginPage(key: UniqueKey())),                   );                 },                 child: Text('确定'),               ),             ],           );         },       );     } else {       // 注册失败       showDialog(         context: context,         builder: (BuildContext context) {           return AlertDialog(             title: Text('注册失败'),             content: Text('错误码: ${response.statusCode}'),             actions: <Widget>[               TextButton(                 onPressed: () {                   Navigator.of(context).pop();                 },                 child: Text('确定'),               ),             ],           );         },       );     }   } catch (e) {     // 请求过程中出现错误     showDialog(       context: context,       builder: (BuildContext context) {         return AlertDialog(           title: Text('请求错误'),           content: Text('$e'),           actions: <Widget>[             TextButton(               onPressed: () {                 Navigator.of(context).pop();               },               child: Text('确定'),             ),           ],         );       },     );   } }     //登录功能   Future<void> login(     BuildContext context,     String username,     String password) async {       Dio dio = Dio();     String checkUrl = "http://192.168.95.241:9090/user/checkCredentials";       Map<String, dynamic> data = {       "user_name": username,       "user_password": password,       };     Response response = await dio.post(checkUrl, data: data);       if (response.statusCode == 200) {       bool isAuthenticated = response.data;         if (isAuthenticated) {         // 显示登录成功对话框         showDialog(           context: context,           builder: (BuildContext context) {             return AlertDialog(               title: Text('登录成功'),               content: Text('欢迎回来！'),               actions: [                 TextButton(                   onPressed: () {                     Navigator.of(context).pop(); // 关闭对话框                   },                   child: Text('确定'),                 ),               ],             );           },         );       } else {         // 身份验证失败，显示错误消息或采取相应的操作         showDialog(           context: context,           builder: (BuildContext context) {             return AlertDialog(               title: Text('登录失败'),               content: Text('用户名或密码不正确'),               actions: [                 TextButton(                   onPressed: () {                     Navigator.of(context).pop(); // 关闭对话框                   },                   child: Text('确定'),                 ),               ],             );           },         );       }     } }           import 'dart:async';   import 'package:dio/dio.dart'; import 'package:flutter/material.dart';   // 导入获取用户信息的方法 import '../Do/UserDao.dart'; import '../component/container.dart'; import '../component/drawer.dart'; import 'Home1.dart'; import 'login.dart';   class MyApp2 extends StatelessWidget {   final String username;     const MyApp2({Key? key, required this.username}) : super(key: key); // 调用父类构造函数     @override   Widget build(BuildContext context) {     return MaterialApp(       title: '心语航标',       theme: ThemeData(         primarySwatch: Colors.purple,       ),       home: MyHome2(username: username),     );   } }   class MyHome2 extends StatefulWidget {   final String username;     const MyHome2({Key? key, required this.username}) : super(key: key);     @override   _MyHome2State createState() => _MyHome2State(); }   class _MyHome2State extends State<MyHome2> {   Map<String, dynamic> userInfo = {}; // 初始化userInfo     @override   void initState() {     super.initState();     getUserInfo(widget.username); // 调用获取用户信息的方法   }     //登录查询用户信息   Future<void> getUserInfo(String username) async {     Dio dio = Dio();     String apiUrl = "http://192.168.95.241:9090/user/findAll?user_name=$username";       try {       Response response = await dio.get(apiUrl);       print(response);       if (response.statusCode == 200) {         setState(() {           userInfo = response.data; // 更新userInfo         });       } else {         setState(() {           userInfo = {}; // 请求失败时将userInfo清空         });       }     } catch (e) {       print("Error fetching user info: $e");       setState(() {         userInfo = {}; // 发生异常时将userInfo清空       });     }   }     @override   Widget build(BuildContext context) {     return DefaultTabController(       length: 4,       child: Scaffold(         appBar: AppBar(           title: const Text('心语航标'),           centerTitle: true,           actions: <Widget>[             IconButton(               icon: const Icon(Icons.search),               onPressed: () {                 // 搜索操作               },             ),           ],         ),         drawer: buildCustomDrawer(           accountEmail: userInfo['user_email'] ?? '未知邮箱',           accountName: userInfo['user_name2'] ?? '未登录',           currentAccountPictureAsset: 'assets/阿尼亚.jpg',           drawerBackgroundAsset: 'assets/可可爱爱阿尼亚.jpg',           drawerItems: [             DrawerItem(title: '用户反馈', icon: Icons.feedback),             DrawerItem(title: '系统设置', icon: Icons.settings),             DrawerItem(title: '我要发布', icon: Icons.send),             DrawerItem(title: '注销', icon: Icons.exit_to_app),           ],           onLoginPressed: () {             Navigator.push(               context,               MaterialPageRoute(                 builder: (context) => LoginPage(key: UniqueKey()),               ),             );           },         ),         bottomNavigationBar: buildCustomBottomNavigationBar(           tabs: [             const Tab(icon: Icon(Icons.home), text: '首页'),             const Tab(icon: Icon(Icons.article), text: '专栏'),             const Tab(icon: Icon(Icons.chat_bubble), text: 'AI咨询'),             const Tab(icon: Icon(Icons.notifications), text: '消息'),           ],           backgroundColor: Colors.black,           height: 60.0,           labelStyle: const TextStyle(height: 0, fontSize: 12),         ),         body: TabBarView(           children: <Widget>[             home1(mt: 'in_teher', key: GlobalKey()),             const Text('data2'),             const Text('data3'),             const Text('data4'),           ],         ),       ),     );   } }