SpringCloud之服务消费者使用RestTemplate调用服务接口即负载均衡

SpringCloud之搭建eureka注册中心https://blog.****.net/kxj19980524/article/details/86775500

SpringCloud之搭建服务提供者https://blog.****.net/kxj19980524/article/details/86775875

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.buba</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--eureka默认已经整合了ribbon负载均衡器和httpclient了-->
        <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-test</artifactId>
            <scope>test</scope>
        </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>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </repository>
    </repositories>

</project>

###服务启动端口号
server.port=8001
###服务名称(服务注册到eureka名称)
spring.application.name=app-buba-order
###服务注册到eureka地址
eureka.client.service-url.defaultZone=http://localhost:8100/eureka
###当前服务注册到eureka上
eureka.client.register-with-eureka=true
###需要检索服务
eureka.client.fetch-registry=true

写Controller调用会员服务

package com.buba.api.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class OrderController {

    //这个是由springboot的web组件提供的
    //rest底层是使用的httpclient实现的
    @Autowired
    private RestTemplate restTemplate;

    /*
    在springcloud中有两种方法调用rest(httpclient),fegin(springcloud提供)
     */
    @RequestMapping("getOrder")
    public String getOrder(){
        //一种直接写访问路径,另一种是写服务名称
        //使用名称形式的话需要在RestTemplate上加@LoadBalanced开启ribbon负载均衡器
        String forObject = restTemplate.getForObject("http://app-buba-member/getMember", String.class);
        //String forObject = restTemplate.getForObject("http://192.168.244.1:8000/getMember", String.class); 一般不直接写地址
        return forObject;
    }

}