feat: 添加用户登录功能

- 创建 SysUserMapper 数据访问层
- 创建 SysUserService/SysUserServiceImpl 业务逻辑层
- 创建 AuthController 认证控制器
- 实现登录、注册、登出接口
- 添加全局异常处理器
- 配置 Sa-Token 跨域支持
- 使用 BCrypt 密码加密

backend/src/main/java/com/innovation/platform/config/SaTokenConfig.java

@@ -0,0 +1,25 @@
+package com.innovation.platform.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.CorsRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+/**
+ * Sa-Token 配置类
+ */
+@Configuration
+public class SaTokenConfig implements WebMvcConfigurer {
+
+    /**
+     * 跨域配置
+     */
+    @Override
+    public void addCorsMappings(CorsRegistry registry) {
+        registry.addMapping("/**")
+                .allowedOriginPatterns("*")
+                .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
+                .allowedHeaders("*")
+                .allowCredentials(true)
+                .maxAge(3600);
+    }
+}

backend/src/main/java/com/innovation/platform/controller/AuthController.java

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+package com.innovation.platform.controller;
+
+import cn.dev33.satoken.annotation.SaIgnore;
+import com.innovation.platform.common.Result;
+import com.innovation.platform.dto.LoginRequest;
+import com.innovation.platform.dto.LoginResponse;
+import com.innovation.platform.dto.RegisterRequest;
+import com.innovation.platform.service.SysUserService;
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.tags.Tag;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.*;
+
+/**
+ * 认证控制器
+ */
+@Tag(name = "认证管理", description = "登录、注册、登出接口")
+@RestController
+@RequestMapping("/api/auth")
+@RequiredArgsConstructor
+public class AuthController {
+
+    private final SysUserService sysUserService;
+
+    @SaIgnore
+    @Operation(summary = "用户登录")
+    @PostMapping("/login")
+    public Result<LoginResponse> login(@Valid @RequestBody LoginRequest request) {
+        LoginResponse response = sysUserService.login(request);
+        return Result.success("登录成功", response);
+    }
+
+    @SaIgnore
+    @Operation(summary = "用户注册")
+    @PostMapping("/register")
+    public Result<Void> register(@Valid @RequestBody RegisterRequest request) {
+        sysUserService.register(request);
+        return Result.success("注册成功", null);
+    }
+
+    @Operation(summary = "用户登出")
+    @PostMapping("/logout")
+    public Result<Void> logout() {
+        sysUserService.logout();
+        return Result.success("登出成功", null);
+    }
+}

backend/src/main/java/com/innovation/platform/dto/LoginRequest.java

@@ -0,0 +1,16 @@
+package com.innovation.platform.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import lombok.Data;
+
+/**
+ * 登录请求 DTO
+ */
+@Data
+public class LoginRequest {
+    @NotBlank(message = "用户名不能为空")
+    private String username;
+
+    @NotBlank(message = "密码不能为空")
+    private String password;
+}

backend/src/main/java/com/innovation/platform/dto/LoginResponse.java

@@ -0,0 +1,22 @@
+package com.innovation.platform.dto;
+
+import lombok.AllArgsConstructor;
+import lombok.Builder;
+import lombok.Data;
+import lombok.NoArgsConstructor;
+
+/**
+ * 登录响应 DTO
+ */
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class LoginResponse {
+    private String token;
+    private Long userId;
+    private String username;
+    private String realName;
+    private String avatar;
+    private Integer roleType;
+}

backend/src/main/java/com/innovation/platform/dto/RegisterRequest.java

@@ -0,0 +1,30 @@
+package com.innovation.platform.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import lombok.Data;
+
+/**
+ * 注册请求 DTO
+ */
+@Data
+public class RegisterRequest {
+    @NotBlank(message = "用户名不能为空")
+    private String username;
+
+    @NotBlank(message = "密码不能为空")
+    private String password;
+
+    @NotBlank(message = "真实姓名不能为空")
+    private String realName;
+
+    @Pattern(regexp = "^1[3-9]\\d{9}$", message = "手机号格式不正确")
+    private String phone;
+
+    @Pattern(regexp = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,}$", message = "邮箱格式不正确")
+    private String email;
+
+    private Integer gender;
+
+    private Integer roleType;
+}

backend/src/main/java/com/innovation/platform/exception/GlobalExceptionHandler.java

@@ -0,0 +1,61 @@
+package com.innovation.platform.exception;
+
+import com.innovation.platform.common.Result;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.validation.BindException;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+import java.util.stream.Collectors;
+
+/**
+ * 全局异常处理器
+ */
+@Slf4j
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    /**
+     * 业务异常
+     */
+    @ExceptionHandler(RuntimeException.class)
+    public Result<Void> handleRuntimeException(RuntimeException e) {
+        log.error("业务异常: {}", e.getMessage(), e);
+        return Result.error(400, e.getMessage());
+    }
+
+    /**
+     * 参数校验异常
+     */
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public Result<Void> handleValidationException(MethodArgumentNotValidException e) {
+        String message = e.getBindingResult().getFieldErrors().stream()
+                .map(FieldError::getDefaultMessage)
+                .collect(Collectors.joining(", "));
+        log.error("参数校验失败: {}", message);
+        return Result.error(400, message);
+    }
+
+    /**
+     * 绑定异常
+     */
+    @ExceptionHandler(BindException.class)
+    public Result<Void> handleBindException(BindException e) {
+        String message = e.getBindingResult().getFieldErrors().stream()
+                .map(FieldError::getDefaultMessage)
+                .collect(Collectors.joining(", "));
+        log.error("参数绑定失败: {}", message);
+        return Result.error(400, message);
+    }
+
+    /**
+     * 其他异常
+     */
+    @ExceptionHandler(Exception.class)
+    public Result<Void> handleException(Exception e) {
+        log.error("系统异常: {}", e.getMessage(), e);
+        return Result.error(500, "系统异常，请稍后重试");
+    }
+}

backend/src/main/java/com/innovation/platform/mapper/SysUserMapper.java

@@ -0,0 +1,12 @@
+package com.innovation.platform.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.innovation.platform.entity.SysUser;
+import org.apache.ibatis.annotations.Mapper;
+
+/**
+ * 用户 Mapper 接口
+ */
+@Mapper
+public interface SysUserMapper extends BaseMapper<SysUser> {
+}

backend/src/main/java/com/innovation/platform/service/SysUserService.java

@@ -0,0 +1,37 @@
+package com.innovation.platform.service;
+
+import com.innovation.platform.dto.LoginRequest;
+import com.innovation.platform.dto.LoginResponse;
+import com.innovation.platform.dto.RegisterRequest;
+import com.innovation.platform.entity.SysUser;
+
+/**
+ * 用户服务接口
+ */
+public interface SysUserService {
+    
+    /**
+     * 用户登录
+     */
+    LoginResponse login(LoginRequest request);
+    
+    /**
+     * 用户注册
+     */
+    void register(RegisterRequest request);
+    
+    /**
+     * 用户登出
+     */
+    void logout();
+    
+    /**
+     * 根据用户名查询用户
+     */
+    SysUser getByUsername(String username);
+    
+    /**
+     * 根据ID查询用户
+     */
+    SysUser getById(Long id);
+}

backend/src/main/java/com/innovation/platform/service/impl/SysUserServiceImpl.java

@@ -0,0 +1,96 @@
+package com.innovation.platform.service.impl;
+
+import cn.dev33.satoken.stp.StpUtil;
+import cn.hutool.crypto.digest.BCrypt;
+import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
+import com.innovation.platform.dto.LoginRequest;
+import com.innovation.platform.dto.LoginResponse;
+import com.innovation.platform.dto.RegisterRequest;
+import com.innovation.platform.entity.SysUser;
+import com.innovation.platform.mapper.SysUserMapper;
+import com.innovation.platform.service.SysUserService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+/**
+ * 用户服务实现类
+ */
+@Service
+@RequiredArgsConstructor
+public class SysUserServiceImpl implements SysUserService {
+
+    private final SysUserMapper sysUserMapper;
+
+    @Override
+    public LoginResponse login(LoginRequest request) {
+        // 查询用户
+        SysUser user = getByUsername(request.getUsername());
+        if (user == null) {
+            throw new RuntimeException("用户名或密码错误");
+        }
+        
+        // 验证密码
+        if (!BCrypt.checkpw(request.getPassword(), user.getPassword())) {
+            throw new RuntimeException("用户名或密码错误");
+        }
+        
+        // 检查用户状态
+        if (user.getStatus() != null && user.getStatus() == 0) {
+            throw new RuntimeException("账号已被禁用");
+        }
+        
+        // 登录
+        StpUtil.login(user.getId());
+        
+        // 返回登录信息
+        return LoginResponse.builder()
+                .token(StpUtil.getTokenValue())
+                .userId(user.getId())
+                .username(user.getUsername())
+                .realName(user.getRealName())
+                .avatar(user.getAvatar())
+                .roleType(user.getRoleType())
+                .build();
+    }
+
+    @Override
+    @Transactional(rollbackFor = Exception.class)
+    public void register(RegisterRequest request) {
+        // 检查用户名是否已存在
+        if (getByUsername(request.getUsername()) != null) {
+            throw new RuntimeException("用户名已存在");
+        }
+        
+        // 创建用户
+        SysUser user = new SysUser();
+        user.setUsername(request.getUsername());
+        user.setPassword(BCrypt.hashpw(request.getPassword()));
+        user.setRealName(request.getRealName());
+        user.setPhone(request.getPhone());
+        user.setEmail(request.getEmail());
+        user.setGender(request.getGender());
+        user.setRoleType(request.getRoleType() != null ? request.getRoleType() : 0);
+        user.setStatus(1);
+        
+        sysUserMapper.insert(user);
+    }
+
+    @Override
+    public void logout() {
+        StpUtil.logout();
+    }
+
+    @Override
+    public SysUser getByUsername(String username) {
+        return sysUserMapper.selectOne(
+                new LambdaQueryWrapper<SysUser>()
+                        .eq(SysUser::getUsername, username)
+        );
+    }
+
+    @Override
+    public SysUser getById(Long id) {
+        return sysUserMapper.selectById(id);
+    }
+}