springcloud 知识总结

如果在使用nacos的时候，一定要搞好配置

注意!!! 不能直接执行官方的config目录下的 nacos-mysql.sql 文件 里面没有创建库的sql语句,只有创建表的语句

找到安装的mariadb 执行mysql -uroot -p

然后创建nacos_config (create database nacos_config)

这个时候再执行nacos文件里面的nacos-mysql.sql（use nacos_config   一定要选择这个库，才进行下一步执行sql 啊啊）

我的放在e盘里面了 执行语句：source:E:\software\windows\springcloud\nacos\conf\nacos-mysql.sql(看到执行成功，泪流满面)

最后单机启动 startup.cmd -m standalone

 第一步：创建父类工程，直接通过maven进行创建  pom 包如下：（其他不需要的直接可以删除了）

<?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.stone.cn</groupId>
    <artifactId>springcloud-all</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>springcloud-privider</module>
        <module>springcloud-consumer</module>
    </modules>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.3.12.RELEASE</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR12</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.2.8.RELEASE</version>
                <scope>import</scope>
                <type>pom</type>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>8</source>
                    <target>8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

2：创建子类工程 provider(主要是pom包)

3：创建子类工程consumer

创建将远程调用的bean交给spring

@Configuration
public class RestTemplateConfig {

@LoadBalanced
    @Bean
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

创建消费者调用提供者（provider可以通过调用并发启动）

 

package com.stone.cn.controller;



@RestController
@CrossOrigin
@RequestMapping("/consumer")
public class ConsumerTest {
    @Value("${server.port}")
    private String port;


    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    private LoadBalancerClient client;

    @RequestMapping(value = "/get",method = RequestMethod.GET)
    public User  getOne(){
        ServiceInstance choose = client.choose("springcloud-privider");
         String url =String.format("http://%s:%s/user/get/%s",choose.getServiceId(),choose.getPort(),choose.getPort());
        System.out.println(choose.getPort());
        System.out.println(choose.getServiceId());
        System.out.println(choose.getInstanceId());
        return restTemplate.getForObject(url, User.class);

    }
}

负载均衡也可以通过Feign

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
启动类上添加@EnableFeignClients

定义Http请求API，基于此API借助OpenFeign访问远端服务

 创建FeignConsumerController中并添加feign访问