springcloud(3)-视图微服务Ribbon

1.创建视图微服务product-view-service-ribbon

2.pom.xml

<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>
    <parent>
        <groupId>com.zhangdemo</groupId>
        <artifactId>springcloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <artifactId>product-view-service-ribbon</artifactId>

    <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>

        <!--thymeleaf-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

    </dependencies>

</project>

3.ProductViewServiceApplication

package com.zhangdemo;

import java.util.Scanner;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.thread.ThreadUtil;
import cn.hutool.core.util.NetUtil;
import cn.hutool.core.util.NumberUtil;

@SpringBootApplication
@EnableEurekaClient             //发现注册中心微服务
@EnableDiscoveryClient
public class ProductViewServiceRibbonApplication {

    public static void main(String[] args) {
        int port = 0;
        int defaultPort = 8010;
        Future<Integer> future = ThreadUtil.execAsync(() ->{
            int p = 0;
            System.out.println("请于5秒钟内输入端口号, 推荐  8010  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(ProductViewServiceRibbonApplication.class).properties("server.port=" + port).run(args);

    }


    //负载均衡
    @Bean
    @LoadBalanced
    RestTemplate restTemplate() {
        return new RestTemplate();
    }

}

4.application.yml

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/
spring:
  application:
    name: product-view-service-ribbon
  thymeleaf:
    cache: false
    prefix: classpath:/templates/
    suffix: .html
    encoding: UTF-8
    servlet:
      content-type: text/html
    mode: HTML5

5.ProductClientRibbon

@Component
public class ProductClientRibbon {

    @Autowired
    RestTemplate restTemplate;

    public List<Product> listProdcuts() {
        return restTemplate.getForObject("http://PRODUCT-DATA-SERVICE/products",List.class);
    }

}

6.Product

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() {

    }
    public Product(int id, String name, int price) {
        super();
        this.id = id;
        this.name = name;
        this.price = price;
    }

}

7.ProductService

@Service
public class ProductService {
    @Autowired
    ProductClientRibbon productClientRibbon;
    public List<Product> listProducts(){
        return productClientRibbon.listProdcuts();

    }
}

8.ProductController

@Controller
public class ProductController {

    @Autowired
    ProductService productService;

    @RequestMapping("/products")
    public Object products(Model m) {
        List<Product> ps = productService.listProducts();
        m.addAttribute("ps", ps);
        return "products";
    }
}

9.启动ProductViewServiceApplication，访问地址http://127.0.0.1:8010/products