spring cloud服务调用

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我是靠谱客的博主甜美钢笔，最近开发中收集的这篇文章主要介绍spring cloud服务调用，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

spring-cloud调用服务有两种方式，一种是Ribbon+RestTemplate, 另外一种是Feign。
Ribbon是一个基于HTTP和TCP客户端的负载均衡器，其实feign也使用了ribbon, 只要使用@FeignClient时，ribbon就会自动使用。

Ribbon+RestTemplate实现服务调用

1.创建服务注册中心

前面章节已经介绍过，如不熟悉请查看

2.创建服务，并注册带注册中心

将http://blog.csdn.net/forwujinwei/article/details/72800571创建的应用复制一份，修改application.properties中的端口号为9001
**注意：在这里我踩了一个坑，请不要将spring.application.name=eureka.client.01,在后续的调用中会报错，就是因为.01，请不要使用还有数字的注册方式，只要保证两个应用的spring.application.name相同就可实现负载均衡测试，在eureka主页面就可以看到是否注册成功。**

3.创建服务发现应用，并调用服务

pom.xml

<?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">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>spring-cloud-server</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.7</java.version>
<spring-cloud.version>Camden.SR4</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

application.properties

server.port=9090
spring.application.name=eureka.client.02
#别这么命名，会死的莫名其妙，在这里不调用，我就不做修改了
eureka.client.serviceUrl.defaultZone=http://127.0.0.1:8761/eureka/

入口类：

package com.example;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
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.http.client.SimpleClientHttpRequestFactory;
import org.springframework.web.client.RestTemplate;
@SpringBootApplication
@EnableDiscoveryClient
public class SpringCloudClientDiscoveryApplication {
@Bean
@LoadBalanced
RestTemplate restTemplate(){
RestTemplate template = new RestTemplate();
SimpleClientHttpRequestFactory factory = (SimpleClientHttpRequestFactory) template.getRequestFactory();
factory.setConnectTimeout(3000);
factory.setReadTimeout(3000);
return template;
}
public static void main(String[] args) {
SpringApplication.run(SpringCloudClientDiscoveryApplication.class, args);
}
}

调用类，为方便测试使用controller类
package com.example.controller;

import java.util.List;

import javax.websocket.server.PathParam;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import com.example.Consten;

@RestController
public class DiscoveryController {
@Autowired
private RestTemplate restTemplate;
@Autowired
private LoadBalancerClient loadBanlancerClient;
@RequestMapping(“/hi”)
public String hi(){
return restTemplate.getForObject(“http://eureka.client/person/get“, String.class);
}
}
补充下服务类：

package com.example.controller;
import javax.websocket.server.PathParam;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/person")
public class PersonController {
@Value("${server.port}")
String port;
@RequestMapping(value="/get",method=RequestMethod.GET)
public String getPerson1(){
return port;//方便观测负载
}
}