本文以nacos为例
分为以下几个步骤
1. 下载nacos软件
2. pom文件配置
3. application.yml文件配置
4. 代码调用
5. 效果展示
一 . 下载nacos软件
1.1 下载nacos-server-2.2.0-BETA这个版本
1.2 修改nacos配置文件
打开bin目录下的startup.cmd，将第26行的
set MODE=“cluster”
改为：
set MODE=“standalone”
1.3 双击startup.cmd
如下图则表示启动成功
二. 项目中引入jar，配置文件pom.xml
Springboot升级为Springcloud版本一定要对应，不然就会有很多稀奇古怪的错误
本文是将2.7.5的Springboot升级为2021.0.7的Springcloud
如图：
以下是几个关键的配置：
完整的pom.xml配置文件
<?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 https://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>2.7.5</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>cstudents</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>students</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<!--<spring-cloud-alibaba-version>2.2.5.RELEASE</spring-cloud-alibaba-version>-->
</properties>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>2021.0.7</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-alibaba-dependencies</artifactId>
<version>2021.0.5.0</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<!-- 依赖 -->
<dependencies>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bootstrap</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-loadbalancer</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba.cloud</groupId>
<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
<exclusions>
<exclusion>
<artifactId>jsr305</artifactId>
<groupId>com.google.code.findbugs</groupId>
</exclusion>
<exclusion>
<artifactId>HdrHistogram</artifactId>
<groupId>org.hdrhistogram</groupId>
</exclusion>
</exclusions>
</dependency>
<!--启动-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--测试-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--thymeleaf-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!--加载JPA-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!--Mybatis-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.1</version>
</dependency>
<!--阿里云-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.2.15</version>
</dependency>
<!--连接mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.31</version>
</dependency>
<!--分页的插件-->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.4.5</version>
</dependency>
<!-- 逆向工程依赖-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.4.2</version>
</dependency>
<!--Mybatis-->
<!--<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.4.1</version>
</dependency>-->
<!--devtools热部署-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
</dependency>
<!-- <dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>-->
</dependencies>
<!--<pluginRepositories>
<pluginRepository>
<id>alimaven spring plugin</id>
<name>alimaven spring plugin</name>
<url>https://maven.aliyun.com/repository/spring-plugin</url>
</pluginRepository>
</pluginRepositories>-->
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
<repository>
<id>repository.springframework.maven.release</id>
<name>Spring Framework Maven Release Repository</name>
<url>http://maven.springframework.org/milestone/</url>
</repository>
<repository>
<id>org.springframework</id>
<url> http://maven.springframework.org/snapshot</url>
</repository>
<repository>
<id>spring-milestone</id>
<name>Spring Maven MILESTONE Repository</name>
<url>http://repo.spring.io/libs-milestone</url>
</repository>
<repository>
<id>spring-release</id>
<name>Spring Maven RELEASE Repository</name>
<url>http://repo.spring.io/libs-release</url>
</repository>
</repositories>
<build>
<plugins>
<!--<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.4.1</version>
</plugin>-->
<!-- 逆向工程插件-->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.6</version>
<configuration>
<configurationFile>GeneratorConfig.xml</configurationFile>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
</project>
在升级为Springcloud时，有些jar会有冲突，本文pom.xml文件中注释掉的就是冲突的jar，但是读者得根据自己的实际情况进行增删冲突jar，不过一般就是文中的这几个
三. application.yml文件配置
server:
port: 9080
spring:
application:
name: consumer
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
注意事项：
4. 代码调用：
项目说明，项目有一个消费者（调用方），和两个生产者（被调用方）
4.1 生产者
生产者代码解析：
代码：
生产者application.yml：
server:
port: 8081
spring:
application:
name: provider
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
生产者调用代码：
本代码中设置了三种情况：
消费者调用时传输一个参数，两个参数，一个集合的三种情况：
package com.example.test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.Map;
@Controller
@RefreshScope
public class PrivodeController {
@Value("${server.port}")
String port;
//传输一个参数
@GetMapping("/hi")
@ResponseBody
public String hi(@RequestParam(value = "name", defaultValue = "forezp",required = false) String name) {
System.out.println("666");
String msg = "I receive msg 【" + name + "】" + ", i'm provider ,my port:" + port;
System.out.println(msg);
return msg;
}
//传输多个参数
@GetMapping("/send")
@ResponseBody
public String send1(@RequestParam(value = "city", defaultValue = "Shanghai",required = false) String city,
@RequestParam(value = "site", defaultValue = "School",required = false) String site) {
System.out.println("666");
String msg = "My favorite city is " + city+ " , I want to go to " + site;
System.out.println(msg);
return msg;
}
//传输Map
@GetMapping("/send2")
@ResponseBody
public String send2(@RequestParam Map data) {
System.out.println("666");
String msg = "My name is " + data.get("name")+ " , I am " + data.get("age") + " years old.";
System.out.println(msg);
return msg;
}
}
生产者启动类：
package com.example;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.web.bind.annotation.RestController;
@MapperScan("com.example.mapper")
@SpringBootApplication
@RestController
@EnableDiscoveryClient
public class StudentsApplication {
public static void main(String[] args) {
SpringApplication.run(StudentsApplication.class, args);
}
}
4.2 消费者
消费者代码解析：
消费者代码：
消费者application.yml
server:
port: 9080
spring:
application:
name: consumer
cloud:
nacos:
discovery:
server-addr: 127.0.0.1:8848
消费者接口：
package com.example.test;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import java.util.Map;
@FeignClient(value = "provider" )
@RefreshScope
public interface ProviderClient {
@GetMapping("/hi")
String hi(@RequestParam(value = "name", defaultValue = "hello", required = false) String name);
@GetMapping("/send1")
String send1(@RequestParam(value = "city", defaultValue = "Shanghai", required = false) String city,
@RequestParam(value = "site", defaultValue = "School", required = false) String site);
@GetMapping("/send2")
String send2(@RequestParam Map data);
}
消费者实现类：
package com.example.test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.HashMap;
import java.util.Map;
@Controller
public class ConsumerController {
@Autowired
ProviderClient providerClient;
//传输一个参数
@GetMapping("/canos")
@ResponseBody
public String hiFeign(){
System.out.println("哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈哈");
return providerClient.hi("你好，我这边发出了信息。。。。。");
}
//传输多个参数
@GetMapping("/test")
@ResponseBody
public String hiNacos(){
System.out.println("666");
return providerClient.send1("Beijing","Tiananmen");
}
//传输Map
@GetMapping("/test2")
@ResponseBody
public String hiNacos2(){
System.out.println("777");
Map<String,String> data = new HashMap<String,String>();
data.put("name","Jack");
data.put("age","18");
return providerClient.send2(data);
}
}
5. 效果展示：
双击启动nacos:
登录nocas:
用户名和密码默认是：nacos
启动一个消费者CStudents_C、两个生产者CStudents_P1、CStudents_P2
观察naocs控制面板：
可以对服务进行上线下线或者分配权重：
调用效果展示：
