创建子项目
pom.xml:
spring-cloud-starter-netflix-eureka-client 表示这是个 eureka 客户端。
spring-boot-starter-web: 表示这是个web服务，会提供控制层
<?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"> <parent> <artifactId>springcloud</artifactId> <groupId>edu.hpu.springcloud</groupId> <version>1.0-SNAPSHOT</version> </parent> <modelVersion>4.0.0</modelVersion> <artifactId>product-data-service</artifactId> <name>product-data-service</name> <!-- FIXME change it to the project's website --> <url>http://www.example.com</url> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <maven.compiler.source>1.8</maven.compiler.source> <maven.compiler.target>1.8</maven.compiler.target> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> </dependencies> </project>
实体类Product:
package edu.hpu.springcloud.pojo; public class Product { private int id; private String name; private int price; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } public Product(int id, String name, int price) { this.id = id; this.name = name; this.price = price; } public Product() { } }
服务层ProductService:
这里把 端口号 放进了产品信息里。 这个数据服务会做成集群，那么访问者为了分辨到底是从哪个数据微服务取的数据，就需要提供个端口号，才能意识到是从不同的微服务得到的数据。
package edu.hpu.springcloud.pojo; public class Product { private int id; private String name; private int price; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getPrice() { return price; } public void setPrice(int price) { this.price = price; } public Product(int id, String name, int price) { this.id = id; this.name = name; this.price = price; } public Product() { } }
控制层ProductController:
把 Product 集合转换成 json 数组。
package edu.hpu.springcloud.controller; import edu.hpu.springcloud.pojo.Product; import edu.hpu.springcloud.service.ProductService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; @RestController public class ProductController { @Autowired private ProductService productService; @RequestMapping("/products") public Object products() { List<Product> ps = productService.listProducts(); return ps; } }
启动类ProductDataServiceApplication：
这里自定义了一个Future类，五秒内用户没有选择端口，则自动选用8001。
package edu.hpu.springcloud; import cn.hutool.core.convert.Convert; import cn.hutool.core.thread.ThreadUtil; import cn.hutool.core.util.NetUtil; import cn.hutool.core.util.NumberUtil; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.builder.SpringApplicationBuilder; import org.springframework.cloud.netflix.eureka.EnableEurekaClient; import java.util.Scanner; import java.util.concurrent.ExecutionException; import java.util.concurrent.Future; import java.util.concurrent.TimeUnit; import java.util.concurrent.TimeoutException; @SpringBootApplication @EnableEurekaClient public class ProductDataServiceApplication { public static void main(String[] args) { int port = 0; int defaultPort = 8002; Future<Integer> future = ThreadUtil.execAsync(() ->{ int p = 0; System.out.println("请于5秒钟内输入端口号, 推荐 8001 、 8002 或者 8003，超过5秒将默认使用 " + defaultPort); Scanner scanner = new Scanner(System.in); while(true) { String strPort = scanner.nextLine(); if(!NumberUtil.isInteger(strPort)) { System.err.println("只能是数字"); continue; } else { p = Convert.toInt(strPort); scanner.close(); break; } } return p; }); try{ port=future.get(5, TimeUnit.SECONDS); } catch (InterruptedException | ExecutionException | TimeoutException e){ port = defaultPort; } if(!NetUtil.isUsableLocalPort(port)) { System.err.printf("端口%d被占用了，无法启动%n", port ); System.exit(1); } new SpringApplicationBuilder(ProductDataServiceApplication.class).properties("server.port=" + port).run(args); } }
配置application.yml:
# server: # port: 因为会启动多个 product-data-service, 所以端口号由用户自动设置，推荐 8001,8002,8003 spring: application: name: product-data-service eureka: client: serviceUrl: defaultZone: http://localhost:8761/eureka/
启动并访问
启动ProductDataServiceApplication，
第一次出了点问题：
com.sun.jersey.api.client.ClientHandlerException: java.net.SocketTimeoutException: Read timed out
这个好像是配置的问题，我没有查出来，再跑一遍，结果就没问题了，但是在注册中心还是有显示，目前没有搞清楚到底什么情况。
访问注册中心：http://localhost:8761/
访问端口为8001服务：http://127.0.0.1:8001/products
再跑一下启动类，这次选择8002：
注册中心：
http://127.0.0.1:8002/products
参考：
【1】、http://how2j.cn/k/springcloud/springcloud-eureka-client/2039.html#nowhere
