(6) SpringBoot 服务发现(RestTemplate)

1. 依赖

1)负载均衡包spring-cloud-starter-ribbon

<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
 
 
#还包括“SpringBoot 服务注册”中的两个依赖：
#spring-boot-starter-actuator
#spring-cloud-starter-consul-discovery

2. SpringBoot入口类中添加代码如下：

package com.ethan.example.client;
 
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.builder.SpringApplicationBuilder;
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;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
 
@EnableSwagger2
@EnableDiscoveryClient            //使用服务注册和发现
@SpringBootApplication
public class Application {
 
    @Bean
    @LoadBalanced               //RestTemplate实例使用服务发现与负载均衡
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
 
    public static void main(String[] args) {
        new SpringApplicationBuilder(Application.class).web(true).run(args);   //重要
    }
}

3. 使用示例

package com.ethan.example.client.controller;
 
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
 
@Api(description = "Test Service Found")
@RestController
@RequestMapping("/test")
public class RestTemplateServiceFundController {
    Logger logger = LoggerFactory.getLogger(RestTemplateServiceFundController.class);
 
    @Autowired
    private RestTemplate restTemplate;
 
    @GetMapping("/find")
    @ApiOperation(value = "Make Service Found")
    public String makeFound() {
        logger.info("test service found begin...");
 
 
        //URL中使用服务名称example代替IP，第一个example是服务名称，第二个example是api路径
        String result = restTemplate.getForObject("http://example/example/project/hello", String.class);
 
        return result;
 
    }
 
}

(6) SpringBoot 服务发现(RestTemplate)

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