<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>cn.how2j.trend</groupId>
        <artifactId>trendParentProject</artifactId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <groupId>cn.how2j.trend</groupId>
    <artifactId>index-gather-store-service</artifactId>

    <dependencies>
        <!-- springboot web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- eureka-client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <!-- 断路器 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

package cn.how2j.trend;

import cn.hutool.core.convert.Convert;
import cn.hutool.core.util.NetUtil;
import cn.hutool.core.util.NumberUtil;
import cn.hutool.core.util.StrUtil;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@SpringBootApplication
@EnableEurekaClient
@EnableHystrix
public class IndexGatherStoreApplication {
    public static void main(String[] args) {

        int defaultPort = 8001;
        int port =defaultPort;
        int eurekaServerPort = 8761;

        if(NetUtil.isUsableLocalPort(eurekaServerPort)) {
        	System.err.printf("检查到端口%d 未启用，判断 eureka 服务器没有启动，本服务无法使用，故退出%n", eurekaServerPort );
        	System.exit(1);
        }

        if(null!=args && 0!=args.length) {
        	for (String arg : args) {
				if(arg.startsWith("port=")) {
					String strPort= StrUtil.subAfter(arg, "port=", true);
					if(NumberUtil.isNumber(strPort)) {
						port = Convert.toInt(strPort);
					}
				}
			}
        }        
        
        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(IndexGatherStoreApplication.class).properties("server.port=" + port).run(args);
    	
    }
    
    @Bean
    RestTemplate restTemplate() {
        return new RestTemplate();
    }
}

package cn.how2j.trend.service;

import cn.how2j.trend.pojo.Index;
import cn.hutool.core.collection.CollectionUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
public class IndexService {
	private List<Index> indexes;
	@Autowired RestTemplate restTemplate;

	@HystrixCommand(fallbackMethod = "third_part_not_connected")
	public List<Index> fetch_indexes_from_third_part(){
    	List<Map> temp= restTemplate.getForObject("http://127.0.0.1:8090/indexes/codes.json",List.class);
    	return map2Index(temp);
	}

	public List<Index> third_part_not_connected(){
		System.out.println("third_part_not_connected()");
		Index index= new Index();
		index.setCode("000000");
		index.setName("无效指数代码");
		return CollectionUtil.toList(index);
	}

	private List<Index> map2Index(List<Map> temp) {
		List<Index> indexes = new ArrayList<>();
		for (Map map : temp) {
			String code = map.get("code").toString();
			String name = map.get("name").toString();
			Index index= new Index();
			index.setCode(code);
			index.setName(name);
			indexes.add(index);
		}

		return indexes;
	}

}