Spring Boot中實現一個過濾器相當簡單，實現javax.servlet.Filter接口即可。

下面以實現一個記錄接口訪問日志及請求耗時的過濾器為例：

1、定義ApiAccessFilter類，并實現Filter接口

@Slf4j@WebFilter(filterName = 'ApiAccessFilter', urlPatterns = '/*')public class ApiAccessFilter implements Filter { @Override public void init(FilterConfig filterConfig) { } @Override public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) servletRequest; Long requestId = IdGenUtils.nextIdByMem(); // 請求ID，這個是我業務中的id，大家可自行決定是否需要 long start = System.currentTimeMillis(); // 請求進入時間 log.info('[Api Access] start. id: {}, uri: {}, method: {}, client: {}', requestId, request.getRequestURI(), request.getMethod(), getIP(request)); filterChain.doFilter(servletRequest, servletResponse); log.info('[Api Access] end. id: {}, duration: {}ms', requestId, System.currentTimeMillis() - start); } @Override public void destroy() { } /** * 獲取IP地址 * * @param request 請求 * @return request發起客戶端的IP地址 */ 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)) { //多次反向代理后會有多個ip值，第一個ip才是真實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、啟用該過濾器

springboot中兩種啟用過濾器的方式，第一種在FilterRegistrationBean中注冊該Filter，第二種，采用注解的方式啟用

個人覺得注冊方式比較麻煩，所有本例中使用的是第二種。

在Filter中添加注解@WebFilter(filterName = 'ApiAccessFilter', urlPatterns = '/*')，配置了過濾器名和需要過濾的請求地址，/*表示過濾所有請求。然后在啟動類上，通過@ServletComponentScan注解，指明該過濾器即可

@SpringBootApplication@ServletComponentScan('com.yclouds.service.demo')public class YCloudsServiceDemoApplication { public static void main(String[] args) { SpringApplication.run(YCloudsServiceDemoApplication.class, args); }}

3、效果展示

發送了兩次http請求，每次都會打印日志內容，并且統計了整個請求的耗時情況。

GitHub地址：https://github.com/ye17186/spring-boot-learn

補充知識：spring cloud gateway 之zuul通過filter配置接口請求的時間耗時記錄到日志

zuul中的Filter的配置,zuul中提供了三種類型的Filter,preFilter,routeFilter和postFilter,分別對應請求中的不同的階段,針對同一個請求,有一個RequestContext對象,在三個階段的Filter中進行共享

假設我們要開發一個統計請求時間的功能,需要在preFilter里邊記錄開始時間,并將整個開始時間放在RequestContext中,在postFilter里邊拿到開始時間,用當前的時間減去開始時間,就是請求執行的時間

定義一個preFilter:

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; /** * Created with Intellij IDEA * * @author: * Mail: * Date: * Time: * To change this template use File | Settings | Editor | File and Code Templates */ 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; } /** * 判斷是否要攔截的邏輯 * * @return */ @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; }}

定義以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; /** * Created with Intellij IDEA * * @author: * Mail: * Date: * Time: * To change this template use File | Settings | Editor | File and Code Templates */ 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('請求完成,耗時{}秒', (System.currentTimeMillis() - startTime) / 1000); return null; }}

在一個配置類中將這兩個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; /** * Created with Intellij IDEA * * @author: * Mail: * Date: * Time: * To change this template use File | Settings | Editor | File and Code Templates */@Configurationpublic class FilterConfig { @Bean public ZuulFilter timeCostPreFilter() { return new TimeCostPreFilter(); } @Bean public ZuulFilter timeCostPostFilter() { return new TimeCostPostFilter(); } @Bean public ZuulFilter pdsFilter() { return new PDSFilter(); }}

啟動項目,可以發現,zuul網關已經注冊到了eureka上:

請求provide對應的地址,發現,zuul可以成功地調用eureka上對應的服務,并將結果正確返回:

以上這篇springboot基于過濾器實現接口請求耗時統計操作就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持好吧啦網。