SpringCloud之eureka client简单实战

eureka 已经逐渐干败zookeeper~

eureka: 注册中心
robbin: 负载均衡策略：找调那一台服务器
RestTemplate：封装工具类，调服务方接口**

话不多说，来兹狗！

1、引包

 <parent>
   <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-parent</artifactId>
    <version>Brixton.SR1</version>
</parent>
<dependency>
     <groupId>org.springframework.cloud</groupId>
     <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
     <version>2.1.1.RELEASE</version>
</dependency>

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
    <version>2.1.1.RELEASE</version>
</dependency>
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-commons</artifactId>
    <version>1.3.5.RELEASE</version>
</dependency>

<dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-sleuth</artifactId>
   <version>1.3.0.RELEASE</version>
 </dependency>

2、配置、注册到eureka，拉eureka上所有服务列表保存到client

app.env=dat
spring.application.name=${app.env}-panda-eureka-client
eureka.client.serviceUrl.defaultZone=http://10.0.0.1:18001/eureka/,http://10.0.0.2:18001/eureka/,http://10.0.0.3:18001/eureka
eureka.instance.prefer-ip-address=true
eureka.instance.instance-id=${spring.cloud.client.ipAddress}:${server.port}

3、注入工具类

 @Autowired
 RestTemplate restTemplate;

4、调远程服务 参考代码step 1 2 3

业务场景：
我这是一个定时任务，调远程集群服务去跑业务逻辑，RPC通过eureka实现

package com.dj.internet.task.batch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;
import redis.clients.jedis.JedisCluster;

/**
 * 定时任务 - 批量清分
 */

@Component
public class BatchSortOutScheduleTask {
    private static Logger logger = LoggerFactory.getLogger(BatchSortOutScheduleTask.class);
     //step 1、注入封装工具类
    @Autowired
    RestTemplate restTemplate;

    //step 2、读配置文件 - 获取注册在eureka上的服务应用名
    @Value("${dj.service.sync.savepdf.serviceid}")
    private String serviceId;
    //step 2、读配置文件 - 获取接口路径
    @Value("${dj.service.batch.savepdf}")
    private String path;

    @Value("${job.corn}")
    private String jonCorn;

    @Value("${app.env}")
    private String env;

    @Autowired
    private JedisCluster jedisCluster;

    private static String LOCK_NAME="Lock_BatchSortOutSchedule";

    // 每天凌晨12点同步当天确认函号中间4位（不含4)最大值到缓存
    @Scheduled(cron = "${job.corn}")
    public void synMaxLetterNo() {
        String lock=jedisCluster.set(env+"_"+LOCK_NAME,"1","NX","EX",30*60);
        if ("OK".equalsIgnoreCase(lock)) {
            try {
                Long start = System.currentTimeMillis();
                logger.info("定时任务 - 批量清分开始。。");
                String url = "http://" + serviceId + "/" + path;
                //step 3、调远程服务，当前post请求，返回类型ResponseEntity,body体获取返回数据
                String result =  restTemplate.postForEntity(url, null, String.class).getBody();
                Long end = System.currentTimeMillis();
                logger.info("定时任务 - 批量清分结束。。耗时："+(end - start )+"ms");
            } catch (Exception e) {
                e.printStackTrace();
                logger.info("定时任务 - 批量清分失败。。");
            }finally {
                if ("OK".equalsIgnoreCase(lock)) {
                    jedisCluster.del(env + "_" + LOCK_NAME);
                }
            }
        }else {
            logger.info("未获取锁");
        }

    }

}

结尾

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