Spring Cloud入门系列服务提供者总结

服务提供者使用Eureka Client组件创建
首先在父项目中创建Eureka Client Server项目（Maven）
创建完成以后，修改pom.xml文件

<?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">
    <parent>
        <artifactId>com.wenqi.springcloud</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>EurekaClient</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
    </dependencies>

</project>

编写application.yml文件

server:
  port: 8010
  # 当前服务注册在eureka server上的名称
spring:
  application:
    name: provider
  # 当前注册中心的访问地址
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
  # 是否将当前服务的ip注册到Eureka Server
  instance:
    prefer-ip-address: true

创建启动类

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

启动启动类，这时候访问http://localhost:8761/ 可以看到服务注册进来了。
接下来进行增删改查的简单业务服务操作

创建实体类

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
    private long id;
    private String name;
    private int age;
}

创建repository

public interface StudentRepository {
    public Collection<Student> findAll();
    public Student findById(long id);
    public void saveOrUpdate(Student student);
    public void deleteById(long id);
}

创建repository实现类

@Repository
public class StudentRepositoryimpl implements StudentRepository {
    private static Map<Long,Student> studentMap;
    static {
        studentMap = new HashMap<Long, Student>();
        studentMap.put(1L,new Student(1L,"张三",22));
        studentMap.put(2L,new Student(2L,"王五",20));
        studentMap.put(3L,new Student(3L,"李四",21));
    }

    public Collection<Student> findAll() {
        return studentMap.values();
    }

    public Student findById(long id) {
        return studentMap.get(id);
    }

    public void saveOrUpdate(Student student) {
        studentMap.put(student.getId(),student);
    }

    public void deleteById(long id) {
        studentMap.remove(id);
    }
}

实现增删改查操作 controller

@RestController
@RequestMapping("/student")
public class StudentController {
    @Autowired
    private StudentRepository studentRepository;
    @GetMapping("/findAll")
    public Collection<Student> findAll(){
        return studentRepository.findAll();
    }
    @GetMapping("/findById/{id}")
    public Student findById(@PathVariable("id") long id){
        return studentRepository.findById(id);
    }
    @PostMapping("/save")
    public void save(@RequestBody Student student){
        studentRepository.saveOrUpdate(student);
    }
    @PutMapping("/update")
    public void update(@RequestBody Student student){
        studentRepository.saveOrUpdate(student);
    }
    @DeleteMapping("/delete/{id}")
    public void deleteById(@PathVariable("id") long id){
        studentRepository.deleteById(id);
    }
}

启动Eureka Client，并启动Eureka Server。
使用postman工具进行测试

postman的使用自己下去进行了练习，不得不说测试还是很有必要的。

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