SpringCloud之Gateway实现路由转发

在访问不同的url时，通过gateway对路径的拦截，按url的区别分配到不同服务器上。

具体实现

首先创建一个父module，eureka-family，同时开启consul

服务提供者

创建子module，eureka-client-hello（其实服务发现工具用的是consul，但命名成eureka了，不过也不重要！）
pom.xml如下

<?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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.hpsyche</groupId>
	<artifactId>eureka-client-hello</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>eureka-client-hello</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
		<spring-cloud.version>Greenwich.SR2</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-consul-discovery</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</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>
		</plugins>
	</build>

</project>

修改application.yml，如下

server:
  port: 8761
spring:
  application:
    name: consul-server-hello
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        serviceName: server-hello

在启动类添加注解@EnableDiscoveryClient
同时添加controller接口，如下

package com.hpsyche.eurekaclienthello.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Hpsyche
 */
@RestController("/hello")
public class HelloController {
    @GetMapping("/hello")
    public String hello(){
        return "hello";
    }
}

同上，创建服务提供者eureka-client-hi
application.yml如下

server:
  port: 8762
spring:
  application:
    name: consul-server-hi
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        serviceName: server-hi

同样在启动类加上@EnableDiscoveryClient注解，同时创建controller

package com.hpsyche.eurekaclienthi.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author Hpsyche
 */
@RestController("/hi")
public class HiController {
    @GetMapping("/hi")
    public String hi(){
        return "hi";
    }
}

gateway模块

创建gateway模块，引入gateway starter等，pom.xml如下

<?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>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.6.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.hpsyche</groupId>
	<artifactId>gateway-client</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>gateway-client</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
		<spring-cloud.version>Greenwich.SR2</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-gateway</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-consul-discovery</artifactId>
		</dependency>


		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</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>
		</plugins>
	</build>

</project>

其application.yml如下所示，

server:
  port: 8750
spring:
  cloud:
    gateway:
      discovery:
        locator:
          lowerCaseServiceId: true
          enabled: true
      routes:
      - id: server-hello
        uri: lb://server-hello
        order: 8000
        predicates:
        - Path=/api/server1/**
        filters:
        - StripPrefix=2
      - id: server-hi
        uri: lb://server-hi
        order: 8001
        predicates:
        - Path=/api/server2/**
        filters:
        - StripPrefix=2
  application:
    name: gateway-client

启动三个服务，访问localhost:8500，如下所示：

访问http://localhost:8750/api/server1/hello

同样访问http://localhost:8750/api/server2/hi，均能正常访问。
配置成功！