SpringBoot自定义拦截器

• 前言
• 一、拦截器使用步骤
• • 1.拦截器配置
  • 2.拦截器处理逻辑
• 总结

代码如下（示例）：

@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

    @Autowired
    private ApiInterceptor apiInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {

        
        List excludePathPatterns = new ArrayList<>();
        excludePathPatterns.add("/VIID/System/Register");
        excludePathPatterns.add("/VIID/System/UnRegister");

        registry.addInterceptor(apiInterceptor)
                .addPathPatterns("/VIID
    @Override
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object handler) throws Exception {
    	boolean flag = false;
    	

        if (flag ){
            return true;
        }else {
            logger.info("---------------拦截请求----------------------");
            logger.info(JSON.toJSONString(responseStatus));
            logger.info("--------------------------------------------");
            returnAjaxError(httpServletResponse, responseStatus);
            return false;
        }
    }

    
    @Override
    public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                           Object handler, ModelAndView modelAndView){
    }

    
    @Override
    public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse,
                                Object o, Exception e) throws Exception {
    }

    public void returnAjaxError(HttpServletResponse response, Object errorMsg){
        PrintWriter writer = null;
        System.out.println("returnError");
        System.out.println(errorMsg);
        try {
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            writer = response.getWriter();
            writer.append(JSON.toJSONString(errorMsg));
        }catch (IOException ignored){
        }finally {
            if (writer != null){
                writer.close();
            }
        }
    }
    }