springcloud简单项目搭建

ゞ浴缸里的玫瑰 2023-03-13 13:06 39阅读 0赞

# IDEA SpringCloud项目搭建 #

#### 1.首先创建一个普通的maven项目用于管理依赖 ####

#### 2.使用创建数据库并使用idea连接数据库 ####

#### 3.导入POM依赖包，并根据数据库写出相应的API的module ####

<packaging>pom</packaging>
    
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    
    </dependencies>

这里的@Data 注解是set和get方法，@NoArgsConstructor 注解是无参构造，这两个注解都是上边依赖包中的。
    @Data
    @NoArgsConstructor
    //链式编程注解
    @Accessors
    public class Dept implements Serializable { 
    
        private Long deptno;
        private String dname;
        //一个服务对应一个数据库
        private String db_source;
    
        public Dept(Long deptno, String dname, String db_source) { 
            this.deptno = deptno;
            this.dname = dname;
            this.db_source = db_source;
        }
    }

#### 4.写一个springcloud的重要组件eureka，相当于一个监控中心，项目名springcloud-eureka-7001 ####

1.第一步导入pom依赖

//这个就是eureka的依赖，第二个是热部署
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

2.在resources下面配置application.yml，具体内容如下

server:
      port: 7001
    eureka:
      instance:
        #eureka服务端的名字
        hostname: localhost
      client:
        #表示是否向服务中心注册自己
        register-with-eureka: false
        #表示自己为注册中心
        fetch-registry: false
        service-url:
          #监控页面
          defaultZone: http://localhost:7001/eureka/

@SpringBootApplication
    //Eureka开启的注解
    @EnableEurekaServer
    public class EurekaServer_7001 { 
        public static void main(String[] args) { 
            SpringApplication.run(EurekaServer_7001.class,args);
        }
    }
    启动类

http://localhost:7001/ 去访问  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BfeGlhb3hpYW8_size_16_color_FFFFFF_t_70]

#### 5.写一个服务提供者module–>(springcloud-provider-dept-8001),导入所需要的依赖 ####

//把上面的API包拿到
    <dependencies>
        <dependency>
            <groupId>com.wang</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        //mysql驱动依赖拿到
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        //druid数据源依赖
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
        </dependency>
        //mybatis依赖
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
        </dependency>
        
        //这个目前还用不到
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        //热部署依赖
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        //相当与tomcat
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
        </dependency>
        //springcloud依赖中的EUREKA 注册中心依赖
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
    </dependencies>

![gen][]1.类似于mybatis实现增删改查操作，运行自己的controller保证自己的环境正常，可以运行。

2.重点在application.yml,全部内容如下

server:
      port: 8001
    mybatis:
      type-aliases-package: com.wang.springcloud.pojo
      config-location: classpath:mybatis/mybatis-config.xml
      mapper-locations: classpath:mybatis/mapper/*.xml spring: application: name: springcloud-provider-dept-8001 datasource: type: com.alibaba.druid.pool.DruidDataSource driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/db01?useUnicode=true&characterEncoding=utf-8&useSSL=false username: root password: 123456 #配置eureka服务注入到监控中心 eureka: client: service-url: defaultZone: http://localhost:7001/eureka/ #修改注册中心名字 instance: instance-id: springcloud-provider-dept8001 info: app.name: springcloud company.name: 中北大学

接下来启动7001，等待运行完，启动8001，可以看到，服务已经注册到了  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BfeGlhb3hpYW8_size_16_color_FFFFFF_t_70 1]

#### 接下来客户端怎么去在注册中心拿到服务呢？springcloud-consumer-dept-80 ####

导入依赖

<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.6.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>com.wang</groupId>
            <artifactId>springcloud-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
    </dependencies>

```java
    @Configuration
    public class RestTemplatePro { 
    
        @Bean
        //基于客户端实现负载均衡
        @LoadBalanced
        public RestTemplate getRestTemplate(){ 
            return new RestTemplate();
        }
    
    
    
    }

@RestController
    public class DeptConsumerController { 
    
        //消费者不应该有service层
        //RestTemplate 供我们直接调用
        @Autowired
        private RestTemplate restTemplate;//提供多种便捷访问远程http的方法
        //private static final String REST_URL_PREFIX = "http://localhost:8001";
        //获得项目的服务的名字，对应注册中心的名字
        private static final String REST_URL_PREFIX = "http://SPRINGCLOUD-PROVIDER-DEPT-8001";
        @RequestMapping("/consumer/dept/get/{id}")
        public Dept get(@PathVariable("id") long id){ 
            return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id,Dept.class);
        }
        @RequestMapping("/consumer/dept/add")
        public boolean add(Dept dept){ 
            return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add",dept,boolean.class);
        }
        @RequestMapping("/consumer/dept/list")
        public List<Dept> list(){ 
            return restTemplate.getForObject(REST_URL_PREFIX+"/start",List.class);
        }
    
    }

在配置一个启动类

@SpringBootApplication
    @EnableEurekaClient
    public class DeptConsumer_80 { 
        public static void main(String[] args) { 
            SpringApplication.run(DeptConsumer_80.class,args);
        }
    }

server:
      port: 80
    
    eureka:
      client:
        register-with-eureka: false
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/

端口号80 访问地址不用写  
![在这里插入图片描述][20200513223847960.png]  
这里解释一下，你访问你原先的provider-service层是：locahost:8080/consumer/dept/list  
如果没有注册中心的话，你的客户端（80）访问 locahost:/consumer/dept/list  
private static final String REST\_URL\_PREFIX = “http://localhost:8001”;  
restTemplate.getForObject(REST\_URL\_PREFIX+"/start",List.class);  
这个方法就会执行，我觉得相当于是在服务端拿到的信息，客户端通过http获得服务端的信息  
注册注册中心eureka，REST\_URL\_PREFIX，为了其他服务提供者使用，所以要修改名字。

（随后还会继续更新springcloud的其他组件，负载均衡服务熔断降级，路由网关）

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[gen]: https://img-blog.csdnimg.cn/20200513220333610.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BfeGlhb3hpYW8=,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BfeGlhb3hpYW8_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200513222733395.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3BfeGlhb3hpYW8=,size_16,color_FFFFFF,t_70
[20200513223847960.png]: https://img-blog.csdnimg.cn/20200513223847960.png