1、登录的过程

登录需要实现两个请求处理

第一次需要处理表单的内容，校验登录信息

第二次请求，会发送第一次请求的 token，需要处理这个 token，从而从登录页跳转到首页

2、验证码功能实现

在 SystemController 添加相应的方法

@RestController
@RequestMapping("/sms/system")
public class SystemController {@GetMapping("/getVerifiCodeImage")public void getVerifiCodeImage(HttpServletRequest request, HttpServletResponse response){// 获取图片BufferedImage verifiCodeImage = CreateVerifiCodeImage.getVerifiCodeImage();// 获取图片上的验证码char[] verifiCodeChars = CreateVerifiCodeImage.getVerifiCode();String verifiCode = new String(verifiCodeChars);// 将验证码文本放入session域，为下一次验证做准备HttpSession session = request.getSession();session.setAttribute("verifiCode", verifiCode);try {// 将验证码图片响应给浏览器ServletOutputStream outputStream = response.getOutputStream();// 将verifiCodeImage以JPEG的格式写到outputStream流中ImageIO.write(verifiCodeImage,"JPEG",outputStream);} catch (IOException e) {e.printStackTrace();}}}

3、登录校验功能实现

3.1、在 service 及其实现类添加登录验证方法

AdminService

public interface AdminService extends IService<Admin> {/*** 登录校验，查询提交的表单是否有此人* @param loginForm 登录页提交的表单* @return*/Admin login(LoginForm loginForm);}

AdminServiceImpl

@Service("adminServiceImpl")
@Transactional
public class AdminServiceImpl extends ServiceImpl<AdminMapper, Admin> implements AdminService {/*** 登录验证，查询提交的表单是否有此人* @param loginForm 登录页提交的表单* @return*/@Overridepublic Admin login(LoginForm loginForm) {QueryWrapper<Admin> queryWrapper = new QueryWrapper<>();queryWrapper.eq("name",loginForm.getUsername())// 注意将密码转为密文.eq("password", MD5.encrypt(loginForm.getPassword()));Admin admin = baseMapper.selectOne(queryWrapper);return admin;}}

StudentService

public interface StudentService extends IService<Student> {/*** 登录校验，查询提交的表单是否有此人* @param loginForm 登录页提交的表单* @return*/Student login(LoginForm loginForm);}

StudentServiceImpl

@Service("stuService")
@Transactional
public class StudentServiceImpl extends ServiceImpl<StudentMapper, Student> implements StudentService {/*** 登录校验，查询提交的表单是否有此人* @param loginForm 登录页提交的表单* @return*/@Overridepublic Student login(LoginForm loginForm) {QueryWrapper<Student> queryWrapper = new QueryWrapper<>();queryWrapper.eq("name", loginForm.getUsername())// 注意将密码转为密文.eq("password", MD5.encrypt(loginForm.getPassword()));Student student = baseMapper.selectOne(queryWrapper);return student;}}

TeacherService

public interface TeacherService extends IService<Teacher> {/*** 登录校验，查询提交的表单是否有此人* @param loginForm 登录页提交的表单* @return*/Teacher login(LoginForm loginForm);}

TeacherServiceImpl

@Service("teaService")
@Transactional
public class TeacherServiceImpl extends ServiceImpl<TeacherMapper, Teacher> implements TeacherService {/*** 登录校验，查询提交的表单是否有此人* @param loginForm 登录页提交的表单* @return*/@Overridepublic Teacher login(LoginForm loginForm) {QueryWrapper<Teacher> queryWrapper = new QueryWrapper<>();queryWrapper.eq("name", loginForm.getUsername())// 注意将密码转为密文.eq("password", MD5.encrypt(loginForm.getPassword()));Teacher teacher = baseMapper.selectOne(queryWrapper);return teacher;}}

3.2、controller 方法

SystemController

@RestController
@RequestMapping("/sms/system")
public class SystemController {@Autowiredprivate AdminService adminService;@Autowiredprivate StudentService studentService;@Autowiredprivate TeacherService teacherService;/*** 验证码功能的实现** @param request* @param response*/@GetMapping("/getVerifiCodeImage")public void getVerifiCodeImage(HttpServletRequest request, HttpServletResponse response) {// 获取图片BufferedImage verifiCodeImage = CreateVerifiCodeImage.getVerifiCodeImage();// 获取图片上的验证码char[] verifiCodeChars = CreateVerifiCodeImage.getVerifiCode();String verifiCode = new String(verifiCodeChars);// 将验证码文本放入session域，为下一次验证做准备HttpSession session = request.getSession();session.setAttribute("verifiCode", verifiCode);try {// 将验证码图片响应给浏览器ServletOutputStream outputStream = response.getOutputStream();// 将verifiCodeImage以JPEG的格式写到outputStream流中ImageIO.write(verifiCodeImage, "JPEG", outputStream);} catch (IOException e) {e.printStackTrace();}}/*** 登录验证，查询提交的表单是否有效* @param loginForm 登录页提交的表单* @param request* @return*/@PostMapping("/login")public Result login(@RequestBody LoginForm loginForm, HttpServletRequest request) {// 验证码校验HttpSession session = request.getSession();String sessionVerifiCode = (String) session.getAttribute("verifiCode");String loginVerifiCode = loginForm.getVerifiCode();if ("".equals(sessionVerifiCode) || null == sessionVerifiCode) {return Result.fail().message("验证码失效，请刷新后重试");}if (!sessionVerifiCode.equalsIgnoreCase(loginVerifiCode)) {return Result.fail().message("验证码错误");}// 从session中移除现有验证码记录session.removeAttribute("verifiCode");// 对用户类型进行校验Map<String, Object> map = new LinkedHashMap<>();  // 用于存放响应的数据switch (loginForm.getUserType()) {case 1:try {Admin admin = adminService.login(loginForm);if (null != admin) {// 在数据库找到该用户，将用户类型和用户id转换为密文，以token向客户端返回信息map.put("token", JwtHelper.createToken(admin.getId().longValue(), 1));} else {throw new RuntimeException("用户名或密码错误");}// 若没有异常，说明可以登录，返回结果return Result.ok(map);} catch (RuntimeException e) {e.printStackTrace();// 产生异常，返回出错信息return Result.fail().message(e.getMessage());}case 2:try {Student student = studentService.login(loginForm);if (null != student) {// 在数据库找到该用户，将用户类型和用户id转换为密文，以token向客户端返回信息map.put("token", JwtHelper.createToken(student.getId().longValue(), 2));} else {throw new RuntimeException("用户名或密码错误");}// 若没有异常，说明可以登录，返回结果return Result.ok(map);} catch (RuntimeException e) {e.printStackTrace();// 产生异常，返回出错信息return Result.fail().message(e.getMessage());}case 3:try {Teacher teacher = teacherService.login(loginForm);if (null != teacher) {// 在数据库找到该用户，将用户类型和用户id转换为密文，以token向客户端返回信息map.put("token", JwtHelper.createToken(teacher.getId().longValue(), 3));} else {throw new RuntimeException("用户名或密码错误");}// 若没有异常，说明可以登录，返回结果return Result.ok(map);} catch (RuntimeException e) {e.printStackTrace();// 产生异常，返回出错信息return Result.fail().message(e.getMessage());}}return Result.fail().message("查无此用户");}}

4、登录校验后从登录页跳转到首页

4.1、完成 service 方法及其实现类