SpringCloud环境配置以及搭建

创建聚合父工程

 
    
        11
        11
    
    
    
	
            org.springframework.boot
            spring-boot-dependencies
            2.7.2-SNAPSHOT
    

    
    
        
            
                org.springframework.cloud
                spring-cloud-dependencies
                2021.0.3
                pom
                import
            
        
    

创建子工程——服务注册中心server1

  
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-server
            3.1.3
        
        
            org.springframework.boot
            spring-boot-starter-web
        
    

配置文件

spring:
  application:
    name: server1
server:
  port: 8080
eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: http://127.0.0.1:${server.port}/eureka/

启动类

@SpringBootApplication
@EnableEurekaServer
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

1、添加依赖

    
        sk-springcloud
        com.buba
        1.0-SNAPSHOT
    
    4.0.0
​
    client1
​
    
        11
        11
    
​
    
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
            3.1.3
        
​
        
            org.springframework.boot
            spring-boot-starter-web
        
​
    
​

2、配置文件

spring:
  application:
    name: client1
  datasource:
    druid:
      username: root
      password: 123456
      url: jdbc:mysql://127.0.0.1:3306/mydb?serverTimezone=Asia/Shanghai
      driver-class-name: com.mysql.cj.jdbc.Driver
server:
  port: 7001
eureka:
  client:
    serviceUrl:
      defaultZone: http://127.0.0.1:8080/eureka/
​
mybatis:
  mapper-locations: classpath:mappers/*.xml

3、启动类

@SpringBootApplication
//@EnableEurekaClient
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}
​

4、集成spring+mybatis+mysql

 
            mysql
            mysql-connector-java
            8.0.29
        
​
        
            com.alibaba
            druid-spring-boot-starter
            1.2.8
        
​
        
            com.buba
            Common
            1.0-SNAPSHOT
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.2.2
        

5、配置文件

mybatis:
  mapper-locations: classpath:mappers/*.xml
  
  
  spring:
    datasource:
        druid:
            username: root
            password: 123456
            url: jdbc:mysql://127.0.0.1:3306/mydb?serverTimezone=Asia/Shanghai
            driver-class-name: com.mysql.cj.jdbc.Driver

6、写逻辑

resources/mappers

mappers

service

controller

集成工共模块 common

1、单点调用及其原理  

 @Bean
    public RestTemplate restTemplate(){
       return new RestTemplate();
    }
    @GetMapping("/findUserById")
    public ResponseEntity findUserById(){
        List list = discoveryClient.getInstances("client1");
        if(list.isEmpty()){
            return null;
        }
        ServiceInstance instanceInfo = list.get(0);
        String instanceId = instanceInfo.getInstanceId();
​
        String url = instanceId+"/user/selectUserById?id=2";
​
        ResponseEntity reps = restTemplate.exchange(url, HttpMethod.GET, new HttpEntity(null,null), new ParameterizedTypeReference() {
        });
        return reps;
    }

2、负载均衡调用

方式1：

 @GetMapping("/findUserById2")
    public ResponseEntity findUserById2(){
​
        ServiceInstance serviceInstance = loadBalanced.choose("client1");
​
        String instanceId = serviceInstance.getInstanceId();
​
        String url = instanceId+"/user/selectUserById?id=2";
​
        ResponseEntity reps = restTemplate.exchange(url, HttpMethod.GET, new HttpEntity(null,null), new ParameterizedTypeReference() {
        });
        return reps;
    }

方式2：

 @Bean
    @LoadBalanced
    public RestTemplate restTemplate(){
       return new RestTemplate();
    }
    @GetMapping("/findUserById3")
    public ResponseEntity findUserById3(){
​
        ResponseEntity reps = restTemplate.exchange("http://client1/user/selectUserById?id=2", HttpMethod.GET, new HttpEntity(null,null), new ParameterizedTypeReference() {
        });
        return reps;
    }