Spring Boot中實現(xiàn)一個過濾器相當(dāng)簡單，實現(xiàn)javax.servlet.Filter接口即可。

下面以實現(xiàn)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(xiàn)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(yè)務(wù)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(fā)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(fā)送了兩次http請求，每次都會打印日志內(nèi)容，并且統(tǒng)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(yīng)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(shè)我們要開發(fā)一個統(tǒng)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(dāng)前的時間減去開始時間,就是請求執(zhí)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(fā)現(xiàn),zuul網(wǎng)關(guān)已經(jīng)注冊到了eureka上:

請求provide對應(yīng)的地址,發(fā)現(xiàn),zuul可以成功地調(diào)用eureka上對應(yīng)的服務(wù),并將結(jié)果正確返回:

以上這篇springboot基于過濾器實現(xiàn)接口請求耗時統(tǒng)計操作就是小編分享給大家的全部內(nèi)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(wǎng)。