SpringCloud代码实战

项目结构

实例实现功能:实现通过id查询用户的订单信息

OrderCommon：公共的一些模块类型，此处为一个user对象

Eureka-Service:配置Eureka的启动类，服务端

Order-Service:提供查询功能的服务端

Order-Client:查询的客户端

OrderCommon代码

package org.example.domain;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

/**
 * @ClassName Order
 * @Author 23
 * @Date 2024/7/10 18:17
 * @Version 1.0
 * @Description TODO
 **/
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Order {
    //定义一个信息类
    private Integer id;
    private String username;
    private Integer userid;
    private String orderinformation;
}

Eureka-Service代码

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

/**
 * @ClassName EurekaStart
 * @Author 23
 * @Date 2024/7/10 19:12
 * @Version 1.0
 * @Description TODO
 **/
@SpringBootApplication
@EnableEurekaServer
public class EurekaStart {
    public static void main(String[] args) {
        SpringApplication.run(EurekaStart.class,args);
    }
}

yml配置:

server:
  port: 10077
eureka:
  instance:
    hostname: localhost
  client:
    registerWithEureka: false
    fetchRegistry: false
    serviceUrl:
      defaultZone: yihttp://${eureka.instance.hostname}:${server.port}/eureka/

pom.xml配置

<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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>Springcloud-Netflix</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>Eureka-Service</artifactId>
    <packaging>jar</packaging>

    <name>Eureka-Service</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </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>
        </dependency>
        <!-- Eureka服务端支持 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>
</project>

Order-Service代码

controller

package org.example.Controller;

import org.example.domain.Order;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

/**
 * @ClassName OderController
 * @Author 23
 * @Date 2024/7/10 18:33
 * @Version 1.0
 * @Description TODO
 **/
@RestController
@RequestMapping("/OrderService")
public class OderController {
    @GetMapping("/user/{id}")
    public List<Order> getOrderByUserid(@PathVariable("id") Integer id){
        return Arrays.asList(new Order(1,"Jack",071021,"尊贵的vip用户"));
    }

}

启动类

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @ClassName OrderStart
 * @Author 23
 * @Date 2024/7/10 18:34
 * @Version 1.0
 * @Description TODO
 **/
@SpringBootApplication
@EnableDiscoveryClient
public class OrderStart {
    public static void main(String[] args) {
        SpringApplication.run(OrderStart.class,args);
    }
}

yml配置

server:
  port: 10010
spring:
  application:
    name: order-service
eureka:
  client:
    service-url:
      defaultZone: http://localhost:10077/eureka #告诉服务提供者要把服务注册到哪儿
  instance:
    prefer-ip-address: true # 当调用getHostname获取实例的hostname时，返回ip而不是host名称

pom.xml

<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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>Springcloud-Netflix</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>Order-Service</artifactId>
    <packaging>jar</packaging>

    <name>Order-Service</name>
    <url>http://maven.apache.org</url>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
    <dependencies>
        <!--变成一个springboot项目-->
        <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>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
        <!--继承一下common-->
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>Order-Common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
</project>

Order-Client代码

BeanConfig

package org.example.Config;

/**
 * @ClassName BeanConfig
 * @Author 23
 * @Date 2024/7/10 18:56
 * @Version 1.0
 * @Description TODO
 **/
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;

//<beans>
@Configuration  //<beans><bean></bean</beans>
public class BeanConfig {

    @Bean  //<bean></bean  把new出来的对象放入spring管理
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

UserController

package org.example.Controller;

import org.example.domain.Order;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.Arrays;
import java.util.List;

/**
 * @ClassName UserController
 * @Author 23
 * @Date 2024/7/10 18:52
 * @Version 1.0
 * @Description TODOj
 **/
@RestController
@RequestMapping("/User")
public class UserController {
    @Autowired
    private RestTemplate restTemplate;
    @Autowired
    private DiscoveryClient discoveryClient;
    @GetMapping("/getOrder/{id}")
    public List<Order> getOrderById(@PathVariable("id") Integer id) {
//        Order[] order = restTemplate.getForObject("http://localhost:10010/OrderService/user/" + id, Order[].class);
//        return Arrays.asList(order);
        List<ServiceInstance> instances=discoveryClient.getInstances("order-service");//通过服务的名字去获取服务实例
        ServiceInstance serviceInstance=instances.get(0);//定死只获取第一个服务实例对象
        String ip=serviceInstance.getHost();//获取服务对象ip
        int port=serviceInstance.getPort();//获取获取的实例对象的服务端口号
        Order[] orders=restTemplate.getForObject("http://"+ip+":"+port+"/OrderService/user/"+id,Order[].class);
        return Arrays.asList(orders);

    }
}

User启动类

package org.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @ClassName ClientStart
 * @Author 23
 * @Date 2024/7/10 18:52
 * @Version 1.0
 * @Description TODO
 **/
@SpringBootApplication
@EnableDiscoveryClient
public class UserStart {
    public static void main(String[] args) {
        SpringApplication.run(UserStart.class,args);
    }
}

yml配置

server:
  port: 10020
spring:
  application:
    name: user-service
eureka:
  client:
    service-url:
      defaultZone: http://localhost:10077/eureka
  instance:
    prefer-ip-address: true

pom.xml配置

<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">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.example</groupId>
        <artifactId>Springcloud-Netflix</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <artifactId>Order-Client</artifactId>
    <packaging>jar</packaging>

    <name>Order-Client</name>
    <url>http://maven.apache.org</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </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>
        </dependency>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>Order-Common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
    </dependencies>
</project>