springboot基于过滤器实现接口请求耗时统计操作

Spring Boot中实现一个过滤器相当简单，实现javax.servlet.Filter接口即可。

下面以实现一个记录接口访问日志及请求耗时的过滤器为例：

1、定义ApiAccessFilter类，并实现Filter接口

@Slf4j
@WebFilter(filterName = "ApiAccessFilter", urlPatterns = "
  private String getIP(HttpServletRequest request) {
    if (request == null) {
      return "0.0.0.0";
    }
 
    String Xip = request.getHeader("X-Real-IP");
    String XFor = request.getHeader("X-Forwarded-For");
 
    String UNKNOWN_IP = "unknown";
    if (StringUtils.isNotEmpty(XFor) && !UNKNOWN_IP.equalsIgnoreCase(XFor)) {
      //多次反向代理后会有多个ip值，第一个ip才是真实ip
      int index = XFor.indexOf(",");
      if (index != -1) {
 return XFor.substring(0, index);
      } else {
 return XFor;
      }
    }
 
    XFor = Xip;
    if (StringUtils.isNotEmpty(XFor) && !UNKNOWN_IP.equalsIgnoreCase(XFor)) {
      return XFor;
    }
 
    if (StringUtils.isBlank(XFor) || UNKNOWN_IP.equalsIgnoreCase(XFor)) {
      XFor = request.getHeader("Proxy-Client-IP");
    }
    if (StringUtils.isBlank(XFor) || UNKNOWN_IP.equalsIgnoreCase(XFor)) {
      XFor = request.getHeader("WL-Proxy-Client-IP");
    }
    if (StringUtils.isBlank(XFor) || UNKNOWN_IP.equalsIgnoreCase(XFor)) {
      XFor = request.getHeader("HTTP_CLIENT_IP");
    }
    if (StringUtils.isBlank(XFor) || UNKNOWN_IP.equalsIgnoreCase(XFor)) {
      XFor = request.getHeader("HTTP_X_FORWARDED_FOR");
    }
    if (StringUtils.isBlank(XFor) || UNKNOWN_IP.equalsIgnoreCase(XFor)) {
      XFor = request.getRemoteAddr();
    }
    return XFor;
  }
}

2、启用该过滤器

springboot中两种启用过滤器的方式，第一种在FilterRegistrationBean中注册该Filter，第二种，采用注解的方式启用

个人觉得注册方式比较麻烦，所有本例中使用的是第二种。

在Filter中添加注解@WebFilter(filterName = "ApiAccessFilter", urlPatterns = " public class TimeCostPreFilter extends ZuulFilter { public static final String START_TIME_KEY = "start_time"; private Logger logger = LoggerFactory.getLogger(TimeCostPreFilter.class); @Override public String filterType() { return FilterConstants.PRE_TYPE; } @Override public int filterOrder() { return 0; } @Override public boolean shouldFilter() { return true; } @Override public Object run() throws ZuulException { long startTime = System.currentTimeMillis(); RequestContext.getCurrentContext().set(START_TIME_KEY, startTime); return null; } }

定义以postFilter:

package com.jiaoyiping.springcloud.zuul.filter; 
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;
 

 
public class TimeCostPostFilter extends ZuulFilter {
  private static final String START_TIME_KE = "start_time";
  private Logger logger = LoggerFactory.getLogger(TimeCostPostFilter.class);
 
  @Override
  public String filterType() {
    return FilterConstants.POST_TYPE;
  }
 
  @Override
  public int filterOrder() {
    return 0;
  }
 
  @Override
  public boolean shouldFilter() {
    return true;
  }
 
  @Override
  public Object run() throws ZuulException {
    long startTime = (long) RequestContext.getCurrentContext().get(START_TIME_KE);
    logger.info("请求完成,耗时{}秒", (System.currentTimeMillis() - startTime) / 1000);
    return null;
  }
}

在一个配置类中将这两个Filter注入:

package com.jiaoyiping.springcloud.zuul.config; 
import com.jiaoyiping.springcloud.zuul.filter.PDSFilter;
import com.jiaoyiping.springcloud.zuul.filter.TimeCostPostFilter;
import com.jiaoyiping.springcloud.zuul.filter.TimeCostPreFilter;
import com.netflix.zuul.ZuulFilter;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 

@Configuration
public class FilterConfig {
 
  @Bean
  public ZuulFilter timeCostPreFilter() {
    return new TimeCostPreFilter();
  }
 
  @Bean
  public ZuulFilter timeCostPostFilter() {
    return new TimeCostPostFilter();
  }
 
 
  @Bean
  public ZuulFilter pdsFilter() {
    return new PDSFilter();
  }
}

启动项目,可以发现,zuul网关已经注册到了eureka上:

请求provide对应的地址,发现,zuul可以成功地调用eureka上对应的服务,并将结果正确返回:

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