1. 没加@Component或者@Configuration注解

2. @ComponentScan没扫描到

     如果启动类和拦截类在平级或者拦截类父级平级的情况下,ComponentScan一般都会扫描到,除非启动类中指定了

3. 路径配置错了

     拦截器的路径配置错误,类不在范围;

4. 已经有类集成了拦截类

    项目中有类已经集成了 WebMvcConfigurationSupport 或 WebMvcConfigurerAdapter 或  WebMvcConfigurer 你再定集成这些类也不会生效;

   其中资源访问配置类,swagger等配置都会使用WebMvcConfigurer来配置,需要把这些类整合在一个类中就可以了;

 

登录验证DEMO:

拦截配置类:

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * Created By: hdx
 * Date: 2021-04-07 16:53
 */
@Configuration
public class ResourceConfig implements WebMvcConfigurer {
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        //可以访问localhost:8095/static/images/image.jpg
        registry.addResourceHandler("/static/**").addResourceLocations("classpath:/static/");
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new AccessInterceptor())
                .addPathPatterns("/**")
                .excludePathPatterns("/sys/login");

    }
}

自定义拦截器:

import cn.dev33.satoken.stp.StpUtil;
import com.ajr.alllink.util.ResponseMessage;
import com.ajr.alllink.util.ResponseMsgEnum;
import com.ajr.alllink.util.Result;
import com.alibaba.fastjson.JSONObject;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * Created By: hdx
 * Date: 2021-04-19 14:24
 */
public class AccessInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        Boolean boo = StpUtil.isLogin();
        System.out.println("全局拦截器 是否登录: "+boo);
        // 未登录
        if(!boo){
            ResponseMessage error = Result.error(ResponseMsgEnum.TOKEN_ERROR.getCode());
            String json = JSONObject.toJSONString(error);
            response.setCharacterEncoding("UTF-8");
            response.setContentType("application/json; charset=utf-8");
            PrintWriter out = null;
            try {
                out = response.getWriter();
                out.append(json);
                System.out.println("全局拦截器 返回数据: "+json);
            } catch (IOException e) {
                e.printStackTrace();
            } finally {
                if (out != null) {
                    out.close();
                }
            }
            return false;
        }
        return true;
    }
}

除了/sys/login接口不需要登录外,其他接口都需要登录;

登录使用的sa-token框架, sa-token 地址:

 

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