springboot 过滤器配合自定义注解使用

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
public @interface MapKV{

    String keyName() default "key";
    String valueName() default "value";
}

@RestController
@RequestMapping("/ws")
public class DemoController {
    @Resource
    private WebSocket webSocket;

    @MapKV(keyName = "12",valueName = "123")
    @GetMapping("/demos")
    public void demo() {
        webSocket.sendOneMessage(String.valueOf(123),"你好");
    }
}

重写所需方法

• preHandle ：Controller方法处理之前
• postHandle：preHandle处理结束 返回true 并且Controller处理结束 DispatcherServlet进行视图的渲染之前 多用于操作返回内容
• afterCompletion：视图渲染之后 多用于清理资源

public class MapKVInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HandlerMethod method =(HandlerMethod) handler;
        MapKV methodAnnotation = method.getMethodAnnotation(MapKV.class);
        if(methodAnnotation != null) {
            log.info(methodAnnotation.keyName());
            log.info(methodAnnotation.valueName());
            log.info("MapKV method annotation");
        }
        return true;
    }
}

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

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(new MapKVInterceptor()).addPathPatterns("/**");
    }
}

参考:Spring注解@EnableWebMvc使用坑点解析