使用注解@Configuration 配置拦截器

继承WebMvcConfigurerAdapter

重写addInterceptoers 添加需要的拦截器地址

文件目录如下：

• Interceptor.java
• ItemController
• UserController.java
• WebMain.java
• WebMvcConfigurer

Interceptor.java

public class Interceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    Map<String,String[]> param = request.getParameterMap();
    if(param.get("id") == null){
        throw new Exception("missing parameter id");
    }
    return true;
}
}

ItemController.java

@RestController
@RequestMapping("/service/item")
public class ItemController {
    @GetMapping("/getItem")
    public String getItem() {
    return "商品详情";
    }
}

UserController.java

@RestController
@RequestMapping("/service/user")
public class UserController {
    @GetMapping("/visit")
    public String login() {
        return "游客访问";
    }
}

WebMain.java

@SpringBootApplication
public class WebMain {
    public static void main(String[] args) {
        SpringApplication.run(WebMain.class, args);
    }
}

WebMvcConfigurer.java

@Configuration
public class WebMvcConfigurer extends WebMvcConfigurerAdapter {

@Bean
public Interceptor getInterceptor(){
    return new Interceptor();
}

@Override
public void addInterceptors(InterceptorRegistry registry){
    //可以添加多个拦截器，拦截顺序是添加顺序
    registry.addInterceptor(getInterceptor()).addPathPatterns("/service/item/**");
    super.addInterceptors(registry);
    }
}