自定義攔截器

1：編寫一個類  實現 HandlerInterceptor接口

@Componentpublic class TestInterceptor implements HandlerInterceptor {

　　//前置方法  進入controller以前執行  可用於校驗token權限
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response, Object handler) throws Exception {

　　　　//controller執行以前，進行攔截的業務代碼
return true;//放行
    }

　　//後置方法  controller執行以後執行
    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        
    }



　　//視圖渲染後執行方法 
    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

 

2：註冊攔截器到spring容器 

　　編寫一個配置類，實現WebMvcConfigurer接口

/**
 * springboot將攔截器注入spring容器
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {

    @Autowired
    private TestInterceptor testInterceptor;


    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //攔截器攔截全部路徑
        registry.addInterceptor(testInterceptor).addPathPatterns("/**");
    }
}