SpringCloud简单实现REST API

SpringCloud简单实现

1. Eureka服务注册中心(eureka-server)

1.1 maven依赖

<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>4.0.0modelVersion>

	<groupId>com.adiaogroupId>
	<artifactId>eureka-serverartifactId>
	<version>0.0.1-SNAPSHOTversion>
	<packaging>jarpackaging>

	<name>eureka-servername>
	<description>Demo project for Spring Bootdescription>

	<parent>
		<groupId>org.springframework.bootgroupId>
		<artifactId>spring-boot-starter-parentartifactId>
		<version>1.5.12.RELEASEversion>
		<relativePath/> 
	parent>

	<properties>
		<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
		<java.version>1.8java.version>
		<spring-cloud.version>Edgware.SR3spring-cloud.version>
	properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloudgroupId>
			<artifactId>spring-cloud-starter-eureka-serverartifactId>
		dependency>

		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-testartifactId>
			<scope>testscope>
		dependency>
	dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloudgroupId>
				<artifactId>spring-cloud-dependenciesartifactId>
				<version>${spring-cloud.version}version>
				<type>pomtype>
				<scope>importscope>
			dependency>
		dependencies>
	dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.bootgroupId>
				<artifactId>spring-boot-maven-pluginartifactId>
			plugin>
		plugins>
	build>
project>

1.2 application.yml

server:
  port: 8761
eureka:
  instance:
    hostname: eureka-server  # eureka实例的主机名
  client:
    register-with-eureka: false #不把自己注册到eureka上
    fetch-registry: false #不从eureka上来获取服务的注册信息
    service-url:
      defaultZone: http://localhost:8761/eureka/

1.3 SpringBoot启动类

package com.adiao.eurekaserver;

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

/**
 * 注册中心
 * 1、配置Eureka信息
 * 2、@EnableEurekaServer
 */
@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {
     

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

2. 服务提供者(provider-ticket)

2.1 maven依赖

<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>4.0.0modelVersion>

	<groupId>com.adiaogroupId>
	<artifactId>provider-ticketartifactId>
	<version>0.0.1-SNAPSHOTversion>
	<packaging>jarpackaging>

	<name>provider-ticketname>
	<description>Demo project for Spring Bootdescription>

	<parent>
		<groupId>org.springframework.bootgroupId>
		<artifactId>spring-boot-starter-parentartifactId>
		<version>1.5.12.RELEASEversion>
		<relativePath/> 
	parent>

	<properties>
		<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
		<java.version>1.8java.version>
		<spring-cloud.version>Edgware.SR3spring-cloud.version>
	properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloudgroupId>
			<artifactId>spring-cloud-starter-eurekaartifactId>
		dependency>

		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-testartifactId>
			<scope>testscope>
		dependency>
	dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloudgroupId>
				<artifactId>spring-cloud-dependenciesartifactId>
				<version>${spring-cloud.version}version>
				<type>pomtype>
				<scope>importscope>
			dependency>
		dependencies>
	dependencyManagement>

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


project>

2.2 application.yml

server:
  port: 8002
spring:
  application:
    name: provider-ticket

eureka:
  instance:
    prefer-ip-address: true # 注册服务的时候使用服务的ip地址
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

2.3 TicketService

package com.adiao.providerticket.service;

public interface TicketService {
     

    public String getTicket();
}

2.4 TicketServiceImpl

package com.adiao.providerticket.service;

import org.springframework.stereotype.Service;

@Service
public class TicketServiceImpl implements TicketService {
     

    @Override
    public String getTicket(){
     
        return "《厉害了，我的国》";
    }
}

2.5 TicketController

package com.adiao.providerticket.controller;

import com.adiao.providerticket.service.TicketService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TicketController {
     


    @Autowired
    TicketService ticketService;

    @GetMapping("/ticket")
    public String getTicket(){
     
        return ticketService.getTicket();
    }
}

2.6 SpingBoot启动类

package com.adiao.providerticket;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ProviderTicketApplication {
     

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

3. 服务调用方(consumer-user)

3.1 maven依赖

<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>4.0.0modelVersion>

	<groupId>com.adiaogroupId>
	<artifactId>consumer-userartifactId>
	<version>0.0.1-SNAPSHOTversion>
	<packaging>jarpackaging>

	<name>consumer-username>
	<description>Demo project for Spring Bootdescription>

	<parent>
		<groupId>org.springframework.bootgroupId>
		<artifactId>spring-boot-starter-parentartifactId>
		<version>1.5.12.RELEASEversion>
		<relativePath/> 
	parent>

	<properties>
		<project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
		<java.version>1.8java.version>
		<spring-cloud.version>Edgware.SR3spring-cloud.version>
	properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloudgroupId>
			<artifactId>spring-cloud-starter-eurekaartifactId>
		dependency>

		<dependency>
			<groupId>org.springframework.bootgroupId>
			<artifactId>spring-boot-starter-testartifactId>
			<scope>testscope>
		dependency>
	dependencies>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloudgroupId>
				<artifactId>spring-cloud-dependenciesartifactId>
				<version>${spring-cloud.version}version>
				<type>pomtype>
				<scope>importscope>
			dependency>
		dependencies>
	dependencyManagement>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.bootgroupId>
				<artifactId>spring-boot-maven-pluginartifactId>
			plugin>
		plugins>
	build>
project>

3.2 application.yml

spring:
  application:
    name: consumer-user
server:
  port: 8200

eureka:
  instance:
    prefer-ip-address: true # 注册服务的时候使用服务的ip地址
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

3.3 UserController

package com.adiao.consumeruser.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class UserController {
     

    @Autowired
    RestTemplate restTemplate;

    @GetMapping("/buy")
    public String buyTicket(String name){
     
        String s = restTemplate.getForObject("http://PROVIDER-TICKET/ticket", String.class);
        return name+"购买了"+s;
    }
}

3.4 SpringBoot启动类

package com.adiao.consumeruser;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableDiscoveryClient //开启发现服务功能
@SpringBootApplication
public class ConsumerUserApplication {
     

	public static void main(String[] args) {
     
		SpringApplication.run(ConsumerUserApplication.class, args);
	}
    
    
	@LoadBalanced //使用负载均衡机制
	@Bean
	public RestTemplate restTemplate(){
     
		return new RestTemplate();
	}
}

4. 测试

依次启动eureka-server–> provider-ticket–> consumer-user

打开浏览器 访问 http://localhost:8761/ 可以看到provider-ticket和 consumer-user都已经注册的eureka注册中心

访问： [http://localhost:8200/buy 可以访问到provider-ticke的/ticket接口