spring cloud gateway简单构件

桃扇骨 2022-05-20 09:23 52阅读 0赞

gateway网关用来分配路由，实现负载均衡

启动gateway

创建一个简单的springboot2.x项目，这里不做介绍

gateway pom.xml

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
             xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>com.example</groupId>
        <artifactId>demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>demo</name>
        <description>Demo project for Spring Boot</description>
    
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.0.3.RELEASE</version>
            <relativePath/> 
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
            <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
        </properties>
    
        <dependencies>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-webflux</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-gateway</artifactId>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
    
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>fastjson</artifactId>
                <version>1.2.31</version>
            </dependency>
            
        </dependencies>
    
        <dependencyManagement>
            <dependencies>
                <dependency>
                    <groupId>org.springframework.cloud</groupId>
                    <artifactId>spring-cloud-dependencies</artifactId>
                    <version>${spring-cloud.version}</version>
                    <type>pom</type>
                    <scope>import</scope>
                </dependency>
            </dependencies>
        </dependencyManagement>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <configuration>
                        <skipTests>true</skipTests>
                    </configuration>
                </plugin>
            </plugins>
        </build>
    
        <repositories>
            <repository>
                <id>spring-milestones</id>
                <name>Spring Milestones</name>
                <url>https://repo.spring.io/milestone</url>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>
        </repositories>
    
    
    </project>

使用eureka注册中心，和几个简单的服务，这里不再赘述。自己照着博客搭一个就可以，大概就是一个

eureka-server server-hi server-gateway 三个即可

启动eureka-server 端口号为 8761  如果没有可以借用http://eureka.didispace.com/这个的eureka

server-hi可以没有

在gateway的aplication.yml文件中

spring:
      application:
        name: service-gateway
      cloud:        # spring cloud gateway 路由配置方式
        gateway:
          discovery:      #是否与服务发现组件进行结合，通过 serviceId(必须设置成大写) 转发到具体的服务实例。默认为false，设为true便开启通过服务中心的自动根据 serviceId 创建路由的功能。
            locator:      #路由访问方式：http://Gateway_HOST:Gateway_PORT/大写的serviceId/**，其中微服务应用名默认大写访问。
              enabled: true
          routes:
          - id: SERVICE-HI                     #网关路由到eureka
            uri: lb://SERVICE-HI               # http也可以   LoadBalancerClient过滤器  这里写啥就会跳到啥页面
            predicates:
              - Path=/SERVICE-HI/**            #路径   websocket长连接可以在lb后使用ws  lb: ws://serviceid
          #          - Weight=provide, 90             # 权重 可以不加
            filter:
              - RedirectTo=404, http://zhihu.com
          - id: baidu                     #网关路由到eureka
            uri: http:www.baidu.com           # http也可以   LoadBalancerClient过滤器
            predicates:
              - Path=/baidu/**            #路径   websocket长连接可以在lb后使用ws  lb: ws://serviceid
          #          - Weight=provide, 90             # 权重 可以不加
    #      - id: baidu
    #        uri: http://baidu.com              # lb 不可以
    #        method: GET                        # 请求方法
    #        predicates:
    #           - Path=/*
    #        filter:
    #        - RedirectTo=302, http://zhihu.com
    
    
    logging:
      level:
        org.springframework.cloud.gateway: trace
        org.springframework.http.server.reactive: debug
        org.springframework.web.reactive: debug
        reactor.ipc.netty: debug
    
    
    eureka:
      client:
        service-url:
          defaultZone: http://localhost:8761/eureka/
        register-with-eureka: true
        fetch-registry: true
    
    feign:
      hystrix:
        enabled: true
      okhttp:
        enabled: true #开启OKHTTP支持，依赖 （feign-okhttp）默认HttpClient
    server:
      port: 8801
    management:
      endpoints:
        web:
          exposure:
            include: "*"

现在启动就可以了，访问localhost:8801/baidu  路由就会跳到百度了，但是 path里的baidu这个会跟在www.baidu.com后面  影响我们使用 这是使用 filters: - StripPrefix=1 截取掉path里的第一个单词，这样我们就能够跳转至百度的首页了。这里就实现了一个简单的gateway

附上github地址 可以down下来跑

https://github.com/p555iii/springCloudStudy