之前有用eureka 现在用nacos
工作流和gateway
新建cloud-删除src-新建modle
Eurak（发现） Eureka的作用114、物业 （注册中心、心跳机制60s失效踢除）
没有服务注册于发现可以，但是会引来无穷无尽的麻烦
静态ip变更，影响多服务模块
新建moudle，和业务完全独立
pom依赖，最外层pomcloud版本号
新建配置文件
注解启动
验证http://localhost:8000/
Eureka客户端代码配置dom
配置properties
启动client
历史
netflex -> open （捐给spring cloud）
非常方便
基于接口和注解，和本地方法一样爽的http请求
价格中调用课程服务
引入依赖
org.springframework.cloud spring-cloud-starter-openfeign 配置文件
#openfeign消费的负载均衡后期再配加注解
//启动类的客户端@EnableFeignClients客户端(在调用类写接口，复制被调用服务的controller方法)
package com.bennyrhys.course.client;import com.bennyrhys.entity.Course;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.web.bind.annotation.GetMapping;import java.util.List;@FeignClient("course-list")public interface CourseListClient { @GetMapping("/course") List getList();} 验证pom中（自动引入其他服务的依赖）
controller(在price服务中调用course服务的方法)
验证
利用Ribbon实现负载均衡修改配置文件
price服务调用course服务的负载均衡设置
#openfeign消费的负载均衡course-list.ribbon.NFLoadBanlancerRuleClassName=com.netflix.loadbalancer.RoundRobinRule比如获取用户信息卡住，但数据库的连接池一直未被释放。系统崩溃
断路器保护，某一处出现问题，保证不影响全部不可用，避免故障蔓延
依赖pom
org.springframework.cloud spring-cloud-starter-netflix-hystrix 配置
#断路器 客户端（默认关闭）feign.hystrix.enabled=true启动类注解
@EnableCircuitBreaker断路器实现类CourseListClientHystrix
package com.bennyrhys.course.client;import com.bennyrhys.entity.Course;import java.util.ArrayList;import java.util.List;import org.springframework.stereotype.Component;@Componentpublic class CourseListClientHystrix implements CourseListClient{ @Override public List getList() { List defaultCourses = new ArrayList<>(); Course course = new Course(); course.setId(1); course.setCourseId(1); course.setCourseName("默认课程"); course.setValid(1); defaultCourses.add(course); return defaultCourses; }} 指明调用服务的断路器类
@FeignClient(value = "course-list", fallback = CourseListClientHystrix.class)@Primary //防止调用服务的controller爆红线不好看public interface CourseListClient { @GetMapping("/course") List getList();} 断路器效果
整合两个服务将课程列表和课程价格进行整合
返回实体CourseAndPrice
Integer id; Integer courseId; String name; Integer price;service
@Override public List getCoursesAndPrice() { List courseAndPriceList = new ArrayList<>(); List courses = courseListClient.courseList(); for (int i = 0; i < courses.size(); i++) { Course course = courses.get(i); if (course != null) { CoursePrice coursePrice = getCoursePrice(course.getCourseId()); CourseAndPrice courseAndPrice = new CourseAndPrice(); courseAndPrice.setPrice(coursePrice.getPrice()); courseAndPrice.setName(course.getCourseName()); courseAndPrice.setId(course.getId()); courseAndPrice.setCourseId(course.getCourseId()); courseAndPriceList.add(courseAndPrice); } } return courseAndPriceList; }} 新建mudle模块sourse-zuul
引入依赖
org.springframework.cloud spring-cloud-starter-netflix-eureka-client org.springframework.cloud spring-cloud-starter-netflix-zuul org.springframework.boot spring-boot-maven-plugin 配置文件
spring.application.name=course-gatewayserver.port=9000logging.pattern.console=%clr(%d{${LOG_DATEFORMAT_PATTERN:HH:mm:ss.SSS}}){faint} %clr(${LOG_LEVEL_PATTERN:-%5p}) %clr(${PID:- }){magenta} %clr(---){faint} %clr([%15.15t]){faint} %clr(%-40.40logger{39}){cyan} %clr(:){faint} %m%n${LOG_EXCEPTION_CONVERSION_WORD:%wEx}mybatis.configuration.map-underscore-to-camel-case=trueeureka.client.service-url.defaultZone=http://localhost:8000/eureka/#zuul.prefix=/bennyrhyszuul.routes.course-list.path=/list@EnableZuulProxy@SpringCloudApplicationpublic class ZuulGatewayApplication { public static void main(String[] args) { SpringApplication.run(ZuulGatewayApplication.class, args); }}效果图
实现网关过滤器过滤前
package com.bennyrhys.course.filter;import com.netflix.zuul.ZuulFilter;import com.netflix.zuul.context.RequestContext;import com.netflix.zuul.exception.ZuulException;import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;import org.springframework.stereotype.Component;@Componentpublic class PreRequestFilter extends ZuulFilter { @Override public String filterType() { //过滤器的类型 return FilterConstants.PRE_TYPE; } @Override public int filterOrder() { return 0; } @Override public boolean shouldFilter() { //是否启用过滤器 return true; } @Override public Object run() throws ZuulException { RequestContext currentContext = RequestContext.getCurrentContext(); currentContext.set("startTime", System.currentTimeMillis()); System.out.println("过滤器已经记录时间"); return null; }}过滤后
package com.bennyrhys.course.filter;import com.netflix.zuul.ZuulFilter;import com.netflix.zuul.context.RequestContext;import com.netflix.zuul.exception.ZuulException;import org.springframework.cache.annotation.Cacheable;import org.springframework.cloud.netflix.zuul.filters.support.FilterConstants;import org.springframework.stereotype.Component;@Componentpublic class PostRequestFilter extends ZuulFilter { @Override public String filterType() { return FilterConstants.POST_TYPE; } @Override public int filterOrder() { return FilterConstants.SEND_RESPONSE_FILTER_ORDER - 1; } @Override public boolean shouldFilter() { return true; } @Override public Object run() throws ZuulException { RequestContext currentContext = RequestContext.getCurrentContext(); Long startTime = (Long) currentContext.get("startTime"); long duration = System.currentTimeMillis() - startTime; String requestURI = currentContext.getRequest().getRequestURI(); System.out.println("uri:" + requestURI + ",处理时长：" + duration); return null; }}uri:/bennyrhys/list/course,处理时长：919
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