创建子项目
![](https://img.laitimes.com/img/__Qf2AjLwojIjJCLyojI0JCLicmbw5iYiV2NycDZ3kDOyIjMxkDOiNDM0AzYyQGNlNmMiJGZi9CX5d2bs92Yl1iclB3bsVmdlR2LcNWaw9CXt92Yu4GZjlGbh5yYjV3Lc9CX6MHc0RHaiojIsJye.png)
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:
参考:
【1】、
http://how2j.cn/k/springcloud/springcloud-eureka-client/2039.html#nowhere