Spring Cloud Gateway

一、新建 Maven 工程，添加相關依賴 pom.xmlhtml

<?xml version="1.0" encoding="UTF-8"?>java
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"spring
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0http://maven.apache.org/xsd/maven-4.0.0.xsd">apache
<modelVersion>4.0.0</modelVersion>app
<groupId>com.anoyi</groupId>maven
<artifactId>core-gateway</artifactId>spring-boot
<version>0.0.1-SNAPSHOT</version>測試
<name>core-gateway</name>ui
<description>gateway for miroservice</description>編碼
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-gateway</artifactId>
<version>2.0.0.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

二、添加啓動類 Application.java

三、啓動 Application（和 Spring Boot 項目同樣）

訪問 http://localhost:8080/ 報錯 404，同時日誌輸出：

2018-06-27 09:18:48.981 WARN 44156 --- [ctor-http-nio-2] .a.w.r.e.DefaultErrorWebExceptionHandler :
Failed to handle request [GET http://localhost:8080/]: Response status 404

假設本地啓動了另外兩個 Spring Boot 服務，分別是服務A( http://localhost:8081)、服務B( http://localhost:8082 )，下面經過 Spring Cloud Gateway 來路由到這兩個服務。

一、在 resources 路徑下添加配置文件 application.yml

二、重啓 Gateway 服務

三、測試

訪問 http://localhost:8080/a/ 路由到服務A http://localhost:8081/

訪問 http://localhost:8080/b/ 路由到服務B http://localhost:8082/

其餘地址，例如 http://localhost:8080/a/user/all 路由到服務A http://localhost:8081/user/all

實現如上服務路由，還能夠經過編碼的方式實現。

一、刪除配置文件 application.yml

二、修改 Application.java，添加自定義路由配置

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.gateway.filter.factory.StripPrefixGatewayFilterFactory;
import org.springframework.cloud.gateway.route.RouteLocator;
import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;
import org.springframework.context.annotation.Bean;
@SpringBootApplication
public class Application {
@Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
StripPrefixGatewayFilterFactory.Config config = new StripPrefixGatewayFilterFactory.Config();
config.setParts(1);
return builder.routes()
.route("host_route", r -> r.path("/a/**").filters(f -> f.stripPrefix(1)).uri("http://localhost:8081"))
.route("host_route", r -> r.path("/b/**").filters(f -> f.stripPrefix(1)).uri("http://localhost:8082"))
.build();
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

http://cloud.spring.io/spring-cloud-gateway/single/spring-cloud-gateway.html

官方提供了大量的路由規則，好比Time、Host、Header 等等，同時也提供了大量的過濾器，好比AddRequestHeader、AddRequestParameter、AddResponseHeader 等等。僅經過簡單的配置便可實現功能強大的網關服務。