[bigdata-111] spring-cloud-07 api网关服务

1. api网关

后面有很多服务，对外用api网管统一提供访问。如果一个用户访问api网关，那么，api网关就会将这些调用转发到后面的诸多服务，然后获取服务结果再返回。而后端的服务都是配置出来的。

2. 参考文献

https://github.com/dyc87112/SpringCloudBook/tree/master/api-gateway

3. 源码目录结构

.
├── pom.xml
├── src
│   ├── main
│   │   ├── java
│   │   │   └── com
│   │   │       └── brian
│   │   │           └── demo
│   │   │               └── apigateway
│   │   │                   └── App.java
│   │   └── resources
│   │       └── application.properties

4. pom.xml

<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.brian.demo</groupId><artifactId>apigateway</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>apigateway</name><url>http://maven.apache.org</url><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.3.7.RELEASE</version><relativePath /> <!-- lookup parent from repository --></parent><repositories><repository><id>my-nexus-central</id><name>my local nexus</name><url>http://localhost:8081/nexus/content/repositories/central/</url><releases><enabled>true</enabled><updatePolicy>never</updatePolicy></releases></repository></repositories><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-zuul</artifactId></dependency><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-eureka</artifactId></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency></dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Brixton.SR5</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></plugins></build></project>

5. App.java

package com.brian.demo.apigateway;import org.springframework.boot.builder.SpringApplicationBuilder;import org.springframework.cloud.client.SpringCloudApplication;import org.springframework.cloud.netflix.zuul.EnableZuulProxy;import org.springframework.cloud.netflix.zuul.filters.discovery.PatternServiceRouteMapper;import org.springframework.context.annotation.Bean;@EnableZuulProxy@SpringCloudApplicationpublic class App {@Beanpublic PatternServiceRouteMapper serviceRouteMapper() {return new PatternServiceRouteMapper("(?<name>^.+)-(?<version>v.+$)", "${version}/${name}");}public static void main(String[] args) {new SpringApplicationBuilder(App.class).web(true).run(args);}}

6. application.properites

spring.application.name=api-gatewayserver.port=5555eureka.client.serviceUrl.defaultZone=http://localhost:1111/eureka/,http://localhost:1111/eureka/zuul.routes.api-a.path=/api/a/**zuul.routes.api-a.serviceId=hello-servicezuul.AccessFilter.pre.disable=true

7. 编译打包

mvn clean package

8. 运行

java -jar target/apigateway-0.0.1-SNAPSHOT.jar

9. 查看

根据配置，如果访问http://localhost:5555/api/a/*，那么，api网关会将这个路由转发到HELLO-SERVICE这里，因此，访问http://localhost:5555/api/a/hello，能看到一个字符串。