SpringCloud Gateway入门

本文是介绍一下SpringCloud Gateway简单路由转发使用。

SpringCloud Gateway简介

SpringCloud是基于Spring Framework 5，Project Reactor和Spring Boot 2.0构建，目标是用于替代zuul。

官方文档

在官方文档上是这样介绍Spring Cloud Gateway的：

该项目提供了一个用于在Spring MVC之上构建API网关的库。Spring Cloud Gateway旨在提供一种简单而有效的方式来路由到API，并为他们提供横切关注点。）

入门案例

接下来，介绍一下简单使用SpringCloud Gateway路由功能（本文使用SpringBoot2.0.0.RELEASE和SpringCloud Finchley.RC1版本）。

创建项目

新建一个项目，项目种加入SpringCloud Gateway依赖，完整pom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>

    <groupId>com.dalaoyang</groupId>
    <artifactId>springcloud_gateway</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springcloud_gateway</name>
    <description>springcloud_gateway</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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.RC1</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-devtools</artifactId>
            <scope>runtime</scope>
        </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>

SpringBoot主程序

在类中配置路由

主程序中加入了一种配置路由的方法，利用@Bean的方式自定义RouteLocator。

package com.dalaoyang;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.gateway.route.RouteLocator;import org.springframework.cloud.gateway.route.builder.RouteLocatorBuilder;import org.springframework.context.annotation.Bean;@SpringBootApplicationpublic class SpringcloudGatewayApplication {    public static void main(String[] args) {
        SpringApplication.run(SpringcloudGatewayApplication.class, args);
    }    @Bean
    public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {        return builder.routes()
                .route(r -> r.path("/jianshu")
                        .uri("http://www.jianshu.com/u/128b6effde53")
                ).build();
    }

}

在配置文件中配置：

server:
  port: 8888spring:
  application:
    name: gateway-service
  cloud:
    gateway:
      routes:
      - id: dalaoyang
        uri: http://www.dalaoyang.cn/
        predicates:
          - Path=/dalaoyang/**
      - id: juejin
        uri: https://juejin.im/user/5aa50b96f265da23866f836e
        predicates:
          - Path=/juejin/**

作者：dalaoyang
链接：https://www.jianshu.com/p/4afdde8a7e42