Spring Cloud微服务实战 打造企业级优惠券系统 4-9 自定义访问日志过滤器

0　　　　课程地址

https://coding.imooc.com/lesson/380.html#mid=28557

1　　　　浓缩精华

1.1　　4.1

2　　　　个人关注

2.1　　4.1

过滤器传参取参的方法

过滤器order最大值为999

3　　　　课程内容

3.1

4　　　　代码演练

4.1　　自定义访问日志过滤器（计算所有过滤器执行时间）

PreRequestFilter （起始过滤器最先执行的）

package com.imooc.coupon.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

/**
 * PreRequestFilter
 * 自定义日志访问过滤器，统计日志执行时间，放在最前边
 * @author 魏豆豆
 * @date 2021/6/10
 */
@Slf4j
@Component
public class PreRequestFilter extends AbstractPreZuulFilter{
    @Override
    public Object continueRun() {
        context.set("startTime", System.currentTimeMillis());
        log.info("开始时间为："+ System.currentTimeMillis());
        return null;
    }

    @Override
    public int filterOrder() {
        return 0;
    }
}

AccessLogFilter （末尾过滤器最后执行的)

package com.imooc.coupon.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
import org.springframework.stereotype.Component;

/**
 * AccessLogFilter
 *
 * @author 魏豆豆
 * @date 2021/6/10
 */
@Slf4j
@Component
public class AccessLogFilter extends AbstractPostZullFilter {
    @Override
    public Object continueRun() {
        long startTime = (long)context.get("startTime");
        long spentTime = System.currentTimeMillis()-startTime;
        log.info("花费时间"+spentTime);
        return null;
    }

    @Override
    public int filterOrder() {
        //第1000条将不再执行
        return FilterConstants.SEND_RESPONSE_FILTER_ORDER-1;
    }
}

FilterConstants（引用的常量）

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.springframework.cloud.netflix.zuul.filters.support;

public class FilterConstants {
    public static final String IS_DISPATCHER_SERVLET_REQUEST_KEY = "isDispatcherServletRequest";
    public static final String FORWARD_TO_KEY = "forward.to";
    public static final String PROXY_KEY = "proxy";
    public static final String REQUEST_ENTITY_KEY = "requestEntity";
    public static final String REQUEST_URI_KEY = "requestURI";
    public static final String RETRYABLE_KEY = "retryable";
    public static final String ROUTING_DEBUG_KEY = "routingDebug";
    public static final String SERVICE_ID_KEY = "serviceId";
    public static final String LOAD_BALANCER_KEY = "loadBalancerKey";
    public static final int DEBUG_FILTER_ORDER = 1;
    public static final int FORM_BODY_WRAPPER_FILTER_ORDER = -1;
    public static final int PRE_DECORATION_FILTER_ORDER = 5;
    public static final int RIBBON_ROUTING_FILTER_ORDER = 10;
    public static final int SEND_ERROR_FILTER_ORDER = 0;
    public static final int SEND_FORWARD_FILTER_ORDER = 500;
    public static final int SEND_RESPONSE_FILTER_ORDER = 1000;
    public static final int SIMPLE_HOST_ROUTING_FILTER_ORDER = 100;
    public static final int SERVLET_30_WRAPPER_FILTER_ORDER = -2;
    public static final int SERVLET_DETECTION_FILTER_ORDER = -3;
    public static final String ERROR_TYPE = "error";
    public static final String POST_TYPE = "post";
    public static final String PRE_TYPE = "pre";
    public static final String ROUTE_TYPE = "route";
    public static final String FORWARD_LOCATION_PREFIX = "forward:";
    public static final int HTTP_PORT = 80;
    public static final int HTTPS_PORT = 443;
    public static final String HTTP_SCHEME = "http";
    public static final String HTTPS_SCHEME = "https";
    public static final String SERVICE_HEADER = "X-Zuul-Service";
    public static final String SERVICE_ID_HEADER = "X-Zuul-ServiceId";
    public static final String X_FORWARDED_FOR_HEADER = "X-Forwarded-For";
    public static final String X_FORWARDED_HOST_HEADER = "X-Forwarded-Host";
    public static final String X_FORWARDED_PREFIX_HEADER = "X-Forwarded-Prefix";
    public static final String X_FORWARDED_PORT_HEADER = "X-Forwarded-Port";
    public static final String X_FORWARDED_PROTO_HEADER = "X-Forwarded-Proto";
    public static final String X_ZUUL_DEBUG_HEADER = "X-Zuul-Debug-Header";

    private FilterConstants() {
        throw new AssertionError("Must not instantiate constant utility class");
    }
}