spring cloud微服务example 入门第一个例子

新建Maven工程

删除src目录，修改poml.xml

<modelVersion>4.0.0</modelVersion>

<groupId>org.example</groupId>
<artifactId>SpringCloud_example</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.3.0.RELEASE</version>
</parent>

<properties>
    <maven.compiler.source>8</maven.compiler.source>
    <maven.compiler.target>8</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <spring.cloud-version>Hoxton.SR8</spring.cloud-version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.18</version>
        <scope>provided</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>

Eureka注册中心

File -> New -> Module

添加依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>
</dependencies>

启动类

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

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

配置文件application.yml

server:
  port: 9000

spring:
  application:
    name: eureka-server

eureka:
  instance:
    hostname: eureka9000.com
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: "https://${eureka.instance.hostname}:${server.port}/eureka/"

common微服务

File -> New -> Module

产品类

package org.example.common.entity;

import lombok.Data;

@Data
public class Product {
    private Long id;
    private String name;
}

修改父pom.xml

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</dependencyManagement>

产品微服务

File -> New -> Module

添加依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>

    <dependency>
        <groupId>org.example</groupId>
        <artifactId>common</artifactId>
    </dependency>
</dependencies>

配置文件application.yml

server:
  port: 9010

spring:
  application:
    name: product-service

eureka:
  client:
    service-url:
      defaultZone: http://localhost:9000/eureka/
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${server.port}
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 10

启动类

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

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

controller类

package org.example.controller;

import org.example.common.entity.Product;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/product")
public class ProductController {
    @GetMapping("/{id}")
    public Product findById(@PathVariable Long id) {
        Product product = new Product();
        product.setId(id);
        product.setName("product test");
        return product;
    }
}

订单微服务

File -> New -> Module

依赖

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-openfeign</artifactId>
    </dependency>

    <dependency>
        <groupId>org.example</groupId>
        <artifactId>common</artifactId>
    </dependency>
</dependencies>

配置文件

server:
  port: 9020

spring:
  application:
    name: order-service

eureka:
  client:
    service-url:
      defaultZone: http://localhost:9000/eureka/
  instance:
    hostname: localhost
    prefer-ip-address: true
    lease-renewal-interval-in-seconds: 5
    lease-expiration-duration-in-seconds: 10

product-service:
  ribbon:
    ConnectTimeout: 250
    ReadTimeout: 1000
    OkToRetryOnAllOperations: true
    MaxAutoRetriesNextServer: 1
    MaxAutoRetries: 1

启动类

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

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

feign接口

package org.example.controller;

import org.example.common.entity.Product;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

@Component
@FeignClient(value = "product-service")
public interface ProductFeign {
    @GetMapping(value = "/product/{id}")
    Product findById(@PathVariable Long id);
}

controller类

package org.example.controller;

import org.example.common.entity.Product;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/order")
public class OrderController {
    @Autowired
    ProductFeign productFeign;

    @GetMapping("/{id}")
    public Product buy(@PathVariable Long id) {
        Product product = productFeign.findById(id);
        return product;
    }
}

网关微服务

File -> New -> Module

添加依赖

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
        
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-gateway</artifactId>
</dependency>

启动类

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

配置文件

server:
  port: 9030

spring:
  application:
    name: api-gateway
  cloud:
    gateway:
      routes:
        - id: product-service
          uri: lb://product-service
          predicates:
            - Path=/product/**
        - id: order-service
          uri: lb://order-service
          predicates:
            - Path=/order/**

eureka:
  client:
    service-url:
      defaultZone: http://localhost:9000/eureka/
  instance:
    prefer-ip-address: true
    instance-id: ${spring.cloud.client.ip-address}:${server.port}

启动eureka-server，product-service，order-service和api-gateway微服务，打开http://localhost:9030/order/1，返回{"id":1,"name":"product test"}

github：GitHub - JJJ2018/SpringCloud_example

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