spring-cloud-alibaba项目搭建以及集成数据库

1、spring-cloud-alibaba

pom文件：

pom

     org.springframework.boot
    spring-boot-starter-parent
    2.2.5.RELEASE

    
        
            com.alibaba.cloud
            spring-cloud-alibaba-dependencies
            2.2.1.RELEASE
            pom
            import
        
        
            org.springframework.cloud
            spring-cloud-dependencies
            Hoxton.SR3
            pom
            import
        
    

    junit
    junit
    4.12

    log4j
    log4j
    1.2.12

    org.projectlombok
    lombok

2、子服务：

spring-cloud-alibaba-user

pom文件：

  
    
        
        
            com.alibaba.cloud 
            spring-cloud-starter-alibaba-nacos-discovery
        

        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-nacos-config
        

        
        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-sentinel
        

        
        
            com.alibaba.csp
            sentinel-datasource-nacos
            1.5.2
        

        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        

        
        
            com.alibaba.cloud
            spring-cloud-starter-alibaba-sentinel
        


        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            1.1.1
        

        
        
            mysql
            mysql-connector-java
            5.1.26
        
    

启动类：

@SpringBootApplication

//开启feign客服端
@EnableFeignClients
//注册客户端
@EnableDiscoveryClient
//扫描包路径
@MapperScan("com.jd.mapper")
public class UserStarter {
    public static void main(String[] args) {
        SpringApplication.run(UserStarter.class);
    }
}

file-extension: yaml # 配置文件的后缀  只有两种可能  properties  yaml

file-extension: yaml做持久化，如果连接数据库需要配置四大金刚

spring:
  cloud:
    sentinel:
      transport:
        #修改yml配置，添加senticel服务控制台地址
        dashboard: localhost:1111
      datasource:
        flow: #限流的配置
          nacos: #限流持久配置
            #使用nacos的持久
            server-addr: localhost:8848
            #获取限流的数据源的dataId
            dataId: application-store-dev
            groupId: DEFAULT_GROUP
            #类型：限流
            rule-type: flow
  datasource:
    username: root
    password: java
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql:///itsourcesstore?useUnicode=true&characterEncoding=UTF-8

#  //配置别名
mybatis:
  type-aliases-package: com.jd.domain

#配置sentinel:熔断
feign:
  sentinel:
    enabled: true #熔断

bootstrap.yml配置文件：
spring:
  cloud:
    nacos:
      server-addr: 127.0.0.1:8848   #nacos的地址
      config:
        name: user-serve   # 配置文件的dataId的前面的部分
        file-extension: yaml # 配置文件的后缀  只有两种可能  properties  yaml
        group: DEFAULT_GROUP  #文件的分组  默认DEFAULT_GROUP
#        namespace: AricChen #namespace如果不写  那么默认会读取public里面的配置文件
  profiles:
    active: dev # 环境名

controller配置：

//刷新范围
@RefreshScope
@RestController
//获取远程配置文件的值，看需求写
@Value("${testTemp}")
private  String testTemp;

@GetMapping("/getUserById/{id}")
@SentinelResource(value = "根据用户ID获取用户信息"
        //限流，配置规则
        ,blockHandler="getUserByIdBlockHandler",
        //熔断
        fallback = "getUserByFallback")

public User getUserById(@PathVariable Long id){
        int i  = 1/0;
    return new User(id,"xx","xx"+testTemp);

}

 //限流，配置规则

public User getUserByFallback(@PathVariable Long id,Throwable e){
    return new User(-1L, "xx", "xx(fallback)");
}

//限流，配置规则


public User getUserByIdBlockHandler(@PathVariable Long id, BlockException ex){
    //打印异常
    ex.printStackTrace();
    //FlowException流异常  instanceof实列
    if (ex instanceof FlowException) {
        return new User(-1L,"xx","xx1(FlowException)");
        //降级异常DegradeException
    }else if (ex instanceof DegradeException){
        return new User(-1L,"xx","xx2(DegradeException)");
        //参数流异常ParamFlowException
    }else if (ex instanceof ParamFlowException){
        return new User(-1L,"xx","xx3(ParamFlowException)");
        //系统块异常SystemBlockException
    }else if (ex instanceof SystemBlockException){
        return new User(-1L,"xx","xx4(ParamFlowException)");
        //权限例外
    }else if (ex instanceof AuthorityException){
        return new User(-1L,"xx","x5(AuthorityException)");
    }
    return new User(-1L, "xx", "xx6(block)");
    }