Eureka Client 代码实现
创建Module，pom.xml
```yaml
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.0.2.RELEASE</version>
</dependency>
</dependencies>
```
创建配置文件 application.yml，添加Eureka Client相关配置
```yaml
server:
port: 8010
spring:
application:
name: provider
eureka:
client:
service-url:
defaultZone: http://localhost:8761/eureka/
instance:
prefer.ip-address: true
```
属性说明：
spring.application.name:当前服务注册在Eureka Server上的名称。
eureka.client.service-url.defaultZone：注册中心的访问地址。
eureka.instance.prefer.ip.address：是否将当前服务的ip注册到Eureka Server。
创建启动类 ProviderApplication
```java
package com.shuang;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class ProviderApplication {
public static void main(String[] args){
SpringApplication.run(ProviderApplication.class,args);
}
}
```
创建实体 Student
```java
package com.shuang.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
private long id;
private String name;
private int age;
}
```
创建学生接口
```java
package com.shuang.repository;
import com.shuang.entity.Student;
import java.util.Collection;
public interface StudentRepository {
public Collection<Student> findAll();
public Student findById(long id);
public void saveOrUpdate(Student student);
public void deleteById(long id);
}
```
创建实现类
```java
package com.shuang.repository.impl;
import com.shuang.entity.Student;
import com.shuang.repository.StudentRepository;
import org.springframework.stereotype.Repository;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
@Repository
public class StudentRepositoryImpl implements StudentRepository {
public static Map<Long,Student> studentMap;
static{
studentMap=new HashMap<>();
studentMap.put(1L,new Student(1L,"张三",22));
studentMap.put(2L,new Student(2L,"李四",23));
studentMap.put(3L,new Student(3L,"王五",24));
}
@Override
public Collection<Student> findAll() {
return studentMap.values();
}
@Override
public Student findById(long id) {
return studentMap.get(id);
}
@Override
public void saveOrUpdate(Student student) {
studentMap.put(student.getId(),student);
}
@Override
public void deleteById(long id) {
studentMap.remove(id);
}
}
```
创建处理器 StudentHandler
```java
package com.shuang.controller;
import com.shuang.entity.Student;
import com.shuang.repository.StudentRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.Collection;
@RestController
@RequestMapping("/student")
public class StudentHandler {
@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("/deleteById/{id}")
public void deleteById(@PathVariable("id") long id){
studentRepository.deleteById(id);
}
}
```
服务提供者可以单独使用springboot完成，但它提供给注册中心后，其他模块能相互调用。
