流程图外部循环结构怎么画

为了实现员工的登录和注册功能，我们需要使用SpringBoot，Mybatis-Plus，Ajax，Layui和MySQL等技术实现。前置条件： - 已经安装了Java（JDK8+） - 已经安装了Maven - 已经安装了MySQL数据库 - 已经学习过SpringBoot，Mybatis-Plus，Ajax和Layui 1. 创建一个SpringBoot项目在IDE中创建一个新的SpringBoot项目。 2. 添加依赖添加Mybatis-Plus的依赖。 ``` <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.3.1</version> </dependency> ``` 添加Lombok的依赖。 ``` <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.20</version> </dependency> ``` 添加Ajax和Layui的CDN链接。 ```  <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script>  <link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/layui/2.5.7/css/layui.min.css"> <script src="https://cdn.bootcdn.net/ajax/libs/layui/2.5.7/layui.all.min.js"></script> ``` 3. 创建数据库创建一个名为employee的数据库，并创建employee表。 ``` CREATE DATABASE employee; CREATE TABLE `employee` ( `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT '主键id', `name` varchar(30) DEFAULT NULL COMMENT '员工姓名', `password` varchar(30) DEFAULT NULL COMMENT '登录密码', PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='员工表'; ``` 4. 配置数据库连接在application.properties文件中配置数据库连接。 ``` spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver spring.datasource.url=jdbc:mysql://localhost:3306/employee?useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8&useSSL=false&allowPublicKeyRetrieval=true spring.datasource.username=root spring.datasource.password=root ``` 5. 创建实体类创建一个Employee实体类，并使用Lombok注解简化代码。 ```java @Data @AllArgsConstructor @NoArgsConstructor public class Employee { private Long id; private String name; private String password; } ``` 6. 创建Mapper类创建一个EmployeeMapper接口，并继承Mybatis-Plus的BaseMapper接口，用于操作employee表。 ```java @Mapper public interface EmployeeMapper extends BaseMapper<Employee> { } ``` 7. 创建Service类创建一个EmployeeService类，并注入EmployeeMapper，实现员工的登录和注册功能。其中，登录功能通过查询指定用户名和密码的员工记录进行验证，注册功能通过新增员工记录实现。 ```java @Service public class EmployeeService { @Autowired private EmployeeMapper employeeMapper; public Employee login(String name, String password) { QueryWrapper<Employee> queryWrapper = new QueryWrapper<>(); queryWrapper.eq("name", name); queryWrapper.eq("password", password); return employeeMapper.selectOne(queryWrapper); } public boolean register(Employee employee) { return employeeMapper.insert(employee) > 0; } } ``` 8. 创建Controller类创建一个EmployeeController类，并注入EmployeeService，实现员工的登录和注册请求处理方法。 ```java @RestController @RequestMapping("/employee") public class EmployeeController { @Autowired private EmployeeService employeeService; @PostMapping("/login") public Result login(@RequestParam String name, @RequestParam String password) { Employee employee = employeeService.login(name, password); if (employee != null) { return Result.success("登录成功"); } else { return Result.error("用户名或密码错误"); } } @PostMapping("/register") public Result register(@RequestBody Employee employee) { boolean result = employeeService.register(employee); if (result) { return Result.success("注册成功"); } else { return Result.error("注册失败"); } } } ``` 9. 创建Result类创建一个Result类，并封装请求响应数据，用于统一管理请求响应格式。 ```java @Data @AllArgsConstructor @NoArgsConstructor public class Result { private Integer code; private String msg; private Object data; public static Result success(String msg) { return new Result(200, msg, null); } public static Result success(String msg, Object data) { return new Result(200, msg, data); } public static Result error(String msg) { return new Result(500, msg, null); } public static Result error(String msg, Object data) { return new Result(500, msg, data); } } ``` 10. 创建HTML页面创建一个login.html页面和register.html页面，分别用于员工的登录和注册操作。 ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>登录</title> <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/layui/2.5.7/css/layui.min.css"> <script src="https://cdn.bootcdn.net/ajax/libs/layui/2.5.7/layui.all.min.js"></script> </head> <body> <div style="margin: 100px auto; width: 400px;"> <form class="layui-form" action=""> <div class="layui-form-item"> <label class="layui-form-label">用户名</label> <div class="layui-input-block"> <input type="text" name="name" required lay-verify="required" placeholder="请输入用户名" autocomplete="off" class="layui-input"> </div> </div> <div class="layui-form-item"> <label class="layui-form-label">密码</label> <div class="layui-input-block"> <input type="password" name="password" required lay-verify="required" placeholder="请输入密码" autocomplete="off" class="layui-input"> </div> </div> <div class="layui-form-item"> <div class="layui-input-block"> <button class="layui-btn" lay-submit lay-filter="login">登录</button> <button type="reset" class="layui-btn layui-btn-primary">重置</button> </div> </div> </form> </div> <script> layui.use(['form', 'layer'], function(){ var form = layui.form; var layer = layui.layer; // 监听表单提交按钮 form.on('submit(login)', function(data){ $.ajax({ url: '/employee/login', type: 'POST', data: { name: data.field.name, password: data.field.password }, success: function(res) { if (res.code === 200) { layer.msg(res.msg); setTimeout(function() { window.location.href = '/index.html'; }, 1000); } else { layer.msg(res.msg); } }, error: function() { layer.msg('系统异常，请稍后重试'); } }); return false; }); }); </script> </body> </html> ``` ```html <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>注册</title> <script src="https://cdn.bootcdn.net/ajax/libs/jquery/3.6.0/jquery.min.js"></script> <link rel="stylesheet" href="https://cdn.bootcdn.net/ajax/libs/layui/2.5.7/css/layui.min.css"> <script src="https://cdn.bootcdn.net/ajax/libs/layui/2.5.7/layui.all.min.js"></script> </head> <body> <div style="margin: 100px auto; width: 400px;"> <form class="layui-form" action=""> <div class="layui-form-item"> <label class="layui-form-label">用户名</label> <div class="layui-input-block"> <input type="text" name="name" required lay-verify="required" placeholder="请输入用户名" autocomplete="off" class="layui-input"> </div> </div> <div class="layui-form-item"> <label class="layui-form-label">密码</label> <div class="layui-input-block"> <input type="password" name="password" required lay-verify="required" placeholder="请输入密码" autocomplete="off" class="layui-input"> </div> </div> <div class="layui-form-item"> <div class="layui-input-block"> <button class="layui-btn" lay-submit lay-filter="register">注册</button> <button type="reset" class="layui-btn layui-btn-primary">重置</button> </div> </div> </form> </div> <script> layui.use(['form', 'layer'], function(){ var form = layui.form; var layer = layui.layer; // 监听表单提交按钮 form.on('submit(register)', function(data){ $.ajax({ url: '/employee/register', type: 'POST', contentType: 'application/json', data: JSON.stringify({ name: data.field.name, password: data.field.password }), success: function(res) { if (res.code === 200) { layer.msg(res.msg); setTimeout(function() { window.location.href = '/login.html'; }, 1000); } else { layer.msg(res.msg); } }, error: function() { layer.msg('系统异常，请稍后重试'); } }); return false; }); }); </script> </body> </html> ``` 至此，我们已经完成了员工的登录和注册功能实现。可以通过运行SpringBoot应用来访问/login.html和/register.html页面，并进行登录和注册操作。