在使用zuul的时候遇到的坑总结一下：
逐渐增加更新以后遇到的
1、在路由的时候莫名其妙的把serviceId给去掉，导致404。比如请求：/serviceId/search/book，zuul会把serviceId去掉，导致匹配不到服务404
解决办法:
zuul:
strip-prefix: false
因为我们没有设置zuul.prefix 为所有的匹配增加前缀, 例如 /api,代理前缀默认会从请求路径中移除(通过 zuul.stripPrefix=false 可以关闭这个功能)
当stripPrefix=true的时候 （http://127.0.0.1:8181/api/user/list -> http://192.168.1.100:8080/user/list）
当stripPrefix=false的时候（http://127.0.0.1:8181/api/user/list -> http://192.168.1.100:8080/api/user/list）
设置这个值以后还是出现了404的问题。最后只能自己实现路由映射。
自定义路由：https://www.jianshu.com/p/647cf467b47c
2、在zuul的过滤器中，有一个FormBodyWrapperFilter过滤器，在使用resin做web容器时启动会报 ServletRequestWrapper.request field not found
通过跟踪源码发现resin的ServletRequestWrapper种的request会多一个下划线，导致
this.servletRequestField = ReflectionUtils.findField(ServletRequestWrapper.class,
"request", ServletRequest.class);
找不到servletRequestField。
解决办法：
重写ZuulServerAutoConfiguration这个类并注释掉FormBodyWrapperFilter的bean
/*
* Copyright 2013-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.cloud.netflix.zuul;
import com.netflix.zuul.FilterLoader;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.filters.FilterRegistry;
import com.netflix.zuul.http.ZuulServlet;
import com.netflix.zuul.monitoring.CounterFactory;
import com.netflix.zuul.monitoring.TracerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.actuate.metrics.CounterService;
import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.autoconfigure.web.ErrorController;
import org.springframework.boot.autoconfigure.web.ServerProperties;
import org.springframework.boot.autoconfigure.web.ServerPropertiesAutoConfiguration;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.cloud.client.actuator.HasFeatures;
import org.springframework.cloud.client.discovery.event.HeartbeatEvent;
import org.springframework.cloud.client.discovery.event.HeartbeatMonitor;
import org.springframework.cloud.context.scope.refresh.RefreshScopeRefreshedEvent;
import org.springframework.cloud.netflix.ribbon.SpringClientFactory;
import org.springframework.cloud.netflix.zuul.filters.CompositeRouteLocator;
import org.springframework.cloud.netflix.zuul.filters.RouteLocator;
import org.springframework.cloud.netflix.zuul.filters.SimpleRouteLocator;
import org.springframework.cloud.netflix.zuul.filters.ZuulProperties;
import org.springframework.cloud.netflix.zuul.filters.post.SendErrorFilter;
import org.springframework.cloud.netflix.zuul.filters.post.SendResponseFilter;
import org.springframework.cloud.netflix.zuul.filters.pre.DebugFilter;
import org.springframework.cloud.netflix.zuul.filters.pre.Servlet30WrapperFilter;
import org.springframework.cloud.netflix.zuul.filters.pre.ServletDetectionFilter;
import org.springframework.cloud.netflix.zuul.filters.route.SendForwardFilter;
import org.springframework.cloud.netflix.zuul.metrics.DefaultCounterFactory;
import org.springframework.cloud.netflix.zuul.metrics.EmptyCounterFactory;
import org.springframework.cloud.netflix.zuul.metrics.EmptyTracerFactory;
import org.springframework.cloud.netflix.zuul.web.ZuulController;
import org.springframework.cloud.netflix.zuul.web.ZuulHandlerMapping;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.Primary;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.core.annotation.Order;
import java.util.Collection;
import java.util.Map;
/**
* @author Spencer Gibb
* @author Dave Syer
* @author Biju Kunjummen
*/
@Configuration
@EnableConfigurationProperties({ZuulProperties.class})
@ConditionalOnClass(ZuulServlet.class)
@ConditionalOnBean(ZuulServerMarkerConfiguration.Marker.class)
// Make sure to get the ServerProperties from the same place as a normal web app would
@Import(ServerPropertiesAutoConfiguration.class)
public class ZuulServerAutoConfiguration {
@Autowired
protected ZuulProperties zuulProperties;
@Autowired
protected ServerProperties server;
@Autowired(required = false)
private ErrorController errorController;
@Bean
public HasFeatures zuulFeature() {
return HasFeatures.namedFeature("Zuul (Simple)", ZuulServerAutoConfiguration.class);
}
@Bean
@Primary
public CompositeRouteLocator primaryRouteLocator(
Collection<RouteLocator> routeLocators) {
return new CompositeRouteLocator(routeLocators);
}
@Bean
@ConditionalOnMissingBean(SimpleRouteLocator.class)
public SimpleRouteLocator simpleRouteLocator() {
return new SimpleRouteLocator(this.server.getServletPrefix(),
this.zuulProperties);
}
@Bean
public ZuulController zuulController() {
return new ZuulController();
}
@Bean
public ZuulHandlerMapping zuulHandlerMapping(RouteLocator routes) {
ZuulHandlerMapping mapping = new ZuulHandlerMapping(routes, zuulController());
mapping.setErrorController(this.errorController);
return mapping;
}
@Bean
public ApplicationListener<ApplicationEvent> zuulRefreshRoutesListener() {
return new ZuulRefreshListener();
}
@Bean
@ConditionalOnMissingBean(name = "zuulServlet")
public ServletRegistrationBean zuulServlet() {
ServletRegistrationBean servlet = new ServletRegistrationBean(new ZuulServlet(),
this.zuulProperties.getServletPattern());
// The whole point of exposing this servlet is to provide a route that doesn't
// buffer requests.
servlet.addInitParameter("buffer-requests", "false");
return servlet;
}
// pre filters
@Bean
public ServletDetectionFilter servletDetectionFilter() {
return new ServletDetectionFilter();
}
// @Bean
// public FormBodyWrapperFilter formBodyWrapperFilter() {
// return new FormBodyWrapperFilter();
// }
@Bean
public DebugFilter debugFilter() {
return new DebugFilter();
}
@Bean
public Servlet30WrapperFilter servlet30WrapperFilter() {
return new Servlet30WrapperFilter();
}
// post filters
@Bean
public SendResponseFilter sendResponseFilter() {
return new SendResponseFilter();
}
@Bean
public SendErrorFilter sendErrorFilter() {
return new SendErrorFilter();
}
@Bean
public SendForwardFilter sendForwardFilter() {
return new SendForwardFilter();
}
@Bean
@ConditionalOnProperty(value = "zuul.ribbon.eager-load.enabled", matchIfMissing = false)
public ZuulRouteApplicationContextInitializer zuulRoutesApplicationContextInitiazer(
SpringClientFactory springClientFactory) {
return new ZuulRouteApplicationContextInitializer(springClientFactory,
zuulProperties);
}
@Configuration
protected static class ZuulFilterConfiguration {
@Autowired
private Map<String, ZuulFilter> filters;
@Bean
public ZuulFilterInitializer zuulFilterInitializer(
CounterFactory counterFactory, TracerFactory tracerFactory) {
FilterLoader filterLoader = FilterLoader.getInstance();
FilterRegistry filterRegistry = FilterRegistry.instance();
return new ZuulFilterInitializer(this.filters, counterFactory, tracerFactory, filterLoader, filterRegistry);
}
}
@Configuration
@ConditionalOnClass(CounterService.class)
protected static class ZuulCounterFactoryConfiguration {
@Bean
@ConditionalOnBean(CounterService.class)
public CounterFactory counterFactory(CounterService counterService) {
return new DefaultCounterFactory(counterService);
}
}
@Configuration
protected static class ZuulMetricsConfiguration {
@Bean
@ConditionalOnMissingBean(CounterFactory.class)
public CounterFactory counterFactory() {
return new EmptyCounterFactory();
}
@ConditionalOnMissingBean(TracerFactory.class)
@Bean
public TracerFactory tracerFactory() {
return new EmptyTracerFactory();
}
}
private static class ZuulRefreshListener
implements ApplicationListener<ApplicationEvent> {
@Autowired
private ZuulHandlerMapping zuulHandlerMapping;
private HeartbeatMonitor heartbeatMonitor = new HeartbeatMonitor();
@Override
public void onApplicationEvent(ApplicationEvent event) {
if (event instanceof ContextRefreshedEvent
|| event instanceof RefreshScopeRefreshedEvent
|| event instanceof RoutesRefreshedEvent) {
this.zuulHandlerMapping.setDirty(true);
} else if (event instanceof HeartbeatEvent) {
if (this.heartbeatMonitor.update(((HeartbeatEvent) event).getValue())) {
this.zuulHandlerMapping.setDirty(true);
}
}
}
}
}
