SpringBoot登录拦截配置详解(实测可用)

背景：写一个用户登录拦截，在网上找了一圈没找到好用的，于是自己试验了一下，总结出来，分享给大家。

1.自定义登录拦截器LoginInterceptor

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									public class LoginInterceptor implements HandlerInterceptor {

									  @Override

									  public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

									    // 这里是关键

									    User loginUser = (User) request.getSession().getAttribute("user");

									    if (loginUser == null) {

									      // 未登录抛出异常，交给统一异常处理器处理

									      throw new CustomException(ResultCode.USER_NOT_LOGIN);

									    }

									    return true;

									  }

									  @Override

									  public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

									  }

									  @Override

									  public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

									  }

									}

2.在WebConfigurer中添加拦截器

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									@Configuration

									public class WebMvcConfig implements WebMvcConfigurer {

									  @Override

									  public void addInterceptors(InterceptorRegistry registry) {

									    //注册TestInterceptor拦截器

									    registry.addInterceptor(new LoginInterceptor())

									        .addPathPatterns("/**")

									        // 排除登录注册等接口，注意这里的格式是 /**/xxx

									        .excludePathPatterns("/**/login", "/**/register"); 

									  }

									}

3.登录接口

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									/**

									   * 登录

									   * @return 用户信息

									   */

									public User login(UserVO userVO. HttpServlet) {

									  String username = userVO.getUsername();

									  String password = userVO.getPassword();

									  User user = userMapper.findByUsernameAndPassword(username, password);

									  // 未找到用户

									  if(user == null) {

									    throw new CustomException(ResultCode.USER_ACCOUNT_ERROR);

									  }

									  // 设置session中的用户信息

									  SessionUtils.setSessionAttribute("user", user);

									  return user;

									}