使用springcloud微服务

使用springcloud微服务结合代码学习

上一篇了解springcloud
下一篇配置服务发现组件eureka

创建提供者 、消费者 、并且消费者调用提供者。
新建工程了，不是新建module

编写提供者

1. 创建springboot项目
   在数据库中创建一个表

drop table user if exists user;
create table user ( 
	id int AUTO_INCREMENT PRIMARY KEY , 
	username varchar(40), 
	name varchar(20), 
	age int(3), 
	balance decimal(10,2) 
);
insert into user (id, username, name, age, balance) values (1, 'account1', '张 三', 20, 100.00); 
insert into user (id, username, name, age, balance) values (2, 'account2', '李 四', 28, 180.00); 
insert into user (id, username, name, age, balance) values (3, 'account3', '王 五', 32, 280.00);

pom.xml

<?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>2.1.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.itzz</groupId>
    <artifactId>springcloud-provider</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud-provider</name>
    <description>Demo project for Spring Boot</description>
    <packaging>jar</packaging>
    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <!--web项目-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!--data-jpa调用底层的和jdbc结合-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
            <scope>runtime</scope>
        </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>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-actuator -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.5.RELEASE</version>
        </dependency>


    </dependencies>
    <!--springcloud依赖-->
    <dependencyManagement>
        <dependencies>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-dependencies -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

创建实体类

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

import javax.persistence.*;
import java.math.BigDecimal;
@Entity
//忽略懒加载的特性
@JsonIgnoreProperties(value = {
    
    "hibernateLazyInitializer","handle","fieldHandler"})
public class User {
    
    
    @Id //主键
    @GeneratedValue(strategy = GenerationType.AUTO) //主键生成策略
    private Integer id;
    @Column(name = "username")
    private String username;
    @Column
    private String name;
    @Column
    private Integer age;
    @Column
    private BigDecimal balance;
	//setter getter
}

创建dao

import com.itzz.springcloudprovider.pojo.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User,Integer> {
    
    
}

controller层

@RestController
public class UserController {
    
    
    @Autowired
    private UserRepository userRepository;
    @GetMapping("user/{id}")
    public User findById(@PathVariable(value = "id") Integer id){
    
    
        return userRepository.getOne(id);
    }
}

application.yml配置文件

#当前项目启动端口
server:
  port: 8000
#连接数据库的信息
 generate-ddl: false 取消让它自动见数据库
 show-sql: true展示sql
spring:
  jpa:
    generate-ddl: false
    show-sql: true
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://localhost:3306/cloud?useUnicode=true&characterEncoding=UTF-8&useSSL=true
    driver-class-name: com.mysql.jdbc.Driver
  #当前启动的名字
  profiles:
    active: provider2
  application:
    name: springcloud-provider
info:
  head: head
  body: body
  app:
    name: @project.artifactId@
    encoding: @project.build.sourceEncoding@
    java:
      source:  @java.version@
      target:  @java.version@
management:
  endpoints:
    web:
      exposure:
        #加载所有的端点，默认只加载了info、health
        include: '*'
  endpoint:
    health:
      show-details: always
      #可以关闭指定的端点
    shutdown:
      enabled: false
eureka:
  client:
    service-url:
      defaultZone: http://root:root@peer1:8761/eureka/,http://root:root@peer2:8762/eureka/
  instance:
    prefer-ip-address: true

测试
http://localhost:8000/user/1

编写服务消费者

1 新建一个springboot工程
pom.xml 文件内容如下

<?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>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.itzz</groupId>
    <artifactId>springcloud-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springcloud-consumer</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </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>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-eureka-client -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.3.RELEASE</version>
        </dependency>

    </dependencies>
    <!--springcloud依赖-->
    <dependencyManagement>
        <dependencies>
            <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-dependencies -->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

创建实体类

public class User {
    
    
    private Integer id;
    private String username;
    private String name;
    private Integer age;
    private BigDecimal balance;
    //省略getter setter
}

无需创建dao
创建controller

@RestController
public class UserController {
    
    
    @Autowired
    private RestTemplate restTemplate;
    @Value("${user.userServiceUrl}")
    private String userServiceUrl;
    @RequestMapping("user/{id}")
    public User findById(@PathVariable("id") Integer id){
    
    
        return restTemplate.getForObject(userServiceUrl+id,User.class);
      
    }
}

配置文件application.yml

user:
  userServiceUrl: http://localhost:8000/user/
info:
  head: head
  body: body
  app:
    name: @project.artifactId@
    encoding: @project.build.sourceEncoding@
    java:
      source:  @java.version@
      target:  @java.version@
management:
  endpoints:
    web:
      exposure:
        include: '*'
  endpoint:
    health:
      show-details: always
    shutdown:
      enabled: false
eureka:
  client:
    service-url:
      defaultZone: http://root:root@peer1:8761/eureka/,http://root:root@peer2:8762/eureka/
  instance:
    prefer-ip-address: true
feign:
  compression:
    request:
      enabled: true
      mime-types: text/xml,application/xml,application/json
    response:
      enabled: true
logging:
  level:
    com.itzz.springcloudconsumer: DEBUG
spring:
  profiles: consumer1
  application:
    name: consumer
server:
  port: 8010

配置文件我太确定复制过来能不能直接用，复制的时候哪里多个空格，最好是自己手敲一遍，不会的可以私信或者评论我看到都会回的。哪里有错了可以指出，我们共同学习

编写启动类

@SpringBootApplication
public class SpringcloudConsumerApplication {
    
    
    @Bean
    public RestTemplate restTemplate(){
    
    
        return new RestTemplate();
    }
    public static void main(String[] args) {
    
    
        SpringApplication.run(SpringcloudConsumerApplication.class, args);
    }

}

yml中的配置

spring:
  profiles: consumer1
  application:
    name: consumer
server:
  port: 8010
user:
  userServiceUrl: http://localhost:8000/user/

http://localhost:8010/user/1，看看能不能显示出来数据。

加入服务发现组件，eureka server ,client

配置健康监控端点

provider 监控 监控jar包、配置文件
consumer 监控 jar包，配置文件

pom.xml中添加如下内容

		<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

application.yml 中添加如下配置如果有

info:
  head: head
  body: body
  app:
    name: @project.artifactId@
    encoding: @project.build.sourceEncoding@
    java:
      source:  @java.version@
      target:  @java.version@
management:
  endpoints:
    web:
      exposure:
        #加载所有的端点，默认只加载了info、health
        include: '*'
  endpoint:
    health:
      show-details: always
      #可以关闭指定的端点
    shutdown:
      enabled: false

测试：http://localhost:8000/actuator/health
http://localhost:8000/actuator/info