spring cloud gateway例子

1月18日，北京，聊聊2025如何加入技术开发？

本文是一个简单的gateway示例，通过网关访问外部服务。
1、创建服务

项目名gateway-service，这个服务只提供一个输出hello信息的接口，并通过网关访问
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.penngo.example</groupId>
    <artifactId>gateway-service</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <name>gateway-service</name>
    <description>https://my.oschina.net/penngo</description>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <java.version>8</java.version>
        <spring-boot.version>2.5.9</spring-boot.version>
        <spring-cloud.version>2020.0.5</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-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.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>

SampleApp.java

package com.penngo.example.sample;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
public class SampleApp {
    public static void main(String[] args) {
        SpringApplication.run(SampleApp.class, args);
    }

    @RestController
    public class HelloController {

        @GetMapping("/hello")
        public String hello(){
            return "[gateway-sample]:Hello";
        }
    }
}

application.yml

server:
  port: 9090
  servlet:
    encoding:
      force: true
      charset: UTF-8
      enabled: true
  tomcat:
    uri-encoding: UTF-8
logging:
  file:
    name: logs/app.log
  logback:
    rollingpolicy:
      max-file-size: 10MB
  pattern:
    console: '%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} %L - %msg%xEx%n'
    file: '%d{yyyy-MM-dd HH:mm:ss.SSS} [%t] %-5level %logger{36} %L - %msg%xEx%n'

2、创建网关
项目名gateway-sample，提供网关服务，也提供一个输出hello的接口
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.penngo.example</groupId>
    <artifactId>gateway-sample</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <name>gateway-sample</name>
    <description>https://my.oschina.net/penngo</description>
    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <java.version>8</java.version>
        <spring-boot.version>2.5.9</spring-boot.version>
        <spring-cloud.version>2020.0.5</spring-cloud.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${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>

GatewayApp.java

package com.penngo.example.sample;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
public class GatewayApp {
    public static void main(String[] args) {
        SpringApplication.run(GatewayApp.class, args);
    }

    @RestController
    public class HelloController {

        @GetMapping("/hello")
        public String hello(){
            return "[gateway-sample]:Hello";
        }
    }
}

application.yml

server:
  port: 8088
spring:
  cloud:
    gateway:
      routes:
        - predicates:
            - Path=/gateway/**
          filters:
            - StripPrefix=1
          uri: http://localhost:9090/hello

3、浏览器访问

源码下载