SpringBoot异常处理器的使用与添加员工功能实现流程介绍

@Slf4j
@WebFilter(filterName = "loginFilterCheck", urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        log.info("拦截到请求：{}", request.getRequestURI());//{}相当于一个占位符 可以实现动态变更
        filterChain.doFilter(request,response);
    }
}

        //获取本次请求的uri
        String requestURI = request.getRequestURI();
        //定义不需要处理的资源路径
        String[] urls=new String[]{
          "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };

    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }

        //判断是否需要处理
        boolean check = check(urls, requestURI);
        //如果不需要处理就直接放行
        if (check){
            filterChain.doFilter(request,response);
            return;
        }

        //查看登陆状态 如果已登录 则直接放行
        if (!(request.getSession().getAttribute("employee") == null)) {
            filterChain.doFilter(request, response);
            return;
        }
        //如果未登录，则通过输出流的方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

    @PostMapping //前端的请求路径为employee,而上述@RequestMapping("/employee")已写好
    public R<String> save(HttpServletRequest request, @RequestBody Employee employee) {
        log.info("新增员工：{}", employee.toString());
        //设置初始默认密码
       employee.setPassword(DigestUtils.md5DigestAsHex("123456".getBytes()));
        //设置更新时间
        employee.setCreateTime(LocalDateTime.now());//创建时间
        employee.setUpdateTime(LocalDateTime.now());//更新时间
        //获取当前登录用户的id
        Long empID = (Long) request.getSession().getAttribute("employee");
        employee.setCreateUser(empID);
        employee.setUpdateUser(empID);
        return R.success("添加员工成功！");
    }

/**
 * 全局异常处理
 */
@ControllerAdvice(annotations = {RestController.class, Controller.class}) //拦截有指定注解类的Controller
@Slf4j
@ResponseBody
public class GlobalExceptionHandler {
    /**
     * 异常处理方法，一旦Controller发生此异常就会被拦截到
     * @return
     */
    @ExceptionHandler({SQLIntegrityConstraintViolationException.class})
    public R<String>  excpHandler(SQLIntegrityConstraintViolationException exception) {//捕获到的异常被传到方法的形参里
       log.info("异常信息："+exception.getMessage());
        //细化添加失败后的返回信息
        if (exception.getMessage().contains("Duplicate entry")){
            String[] s = exception.getMessage().split(" ");
            String msg=s[2]+"已存在!";
            return R.error(msg);
        }
        return R.error("发生异常！添加失败！");
    }
}