FeignClient通过配置变量调用配置文件url代码示例

本篇文章小编给大家分享一下FeignClient通过配置变量调用配置文件url代码示例，文章代码介绍的很详细，小编觉得挺不错的，现在分享给大家供大家参考，有需要的小伙伴们可以来看看。

1.application.yml 配置文件配置参数

feign:
  sys: http://127.0.0.1:8777

2.ISysFeignClient.java 使用@FeignClient时配置

@FeignClient(value = "sys",url = "${feign.sys}")
public interface ISysFeignClient {
 
    @GetMapping("/sys/queryPlatMenus")
    List> queryPlatMenus();
}

这样部署开发时就可以只需要修改一处yml配置url就可以了。

调用指定的动态URL

1 创建demo1服务

pom.xml

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.5.3
		 
	
	com.demo
	demo1
	0.0.1-SNAPSHOT
	demo1
	Demo project for Spring Boot
	
		1.8
		2020.0.3
	
	
		
			org.springframework.boot
			spring-boot-starter-web
		
		
			org.springframework.cloud
			spring-cloud-starter-openfeign
		
		
		
			org.springframework.cloud
			spring-cloud-starter-netflix-eureka-client
		
		
			org.springframework.boot
			spring-boot-starter-test
			test
		
	
	
		
			
				org.springframework.cloud
				spring-cloud-dependencies
				${spring-cloud.version}
				pom
				import
			
		
	
	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
		
	

application-dev1.yml

server:
  port: 8111
spring:
  application:
    name: ${APPLICATION_NAME:demo1}
eureka:
  client:
    fetch-registry: true
    register-with-eureka: true
    service-url:
       defaultZone: http://localhost:18880/eureka
  instance:
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
    prefer-ip-address: true

application-dev2.yml

server:
  port: 8112
spring:
  application:
    name: ${APPLICATION_NAME:demo1}
eureka:
  client:
    fetch-registry: true
    register-with-eureka: true
    service-url:
      defaultZone: http://localhost:18880/eureka
  instance:
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
    prefer-ip-address: true

IndexController.java

package com.demo.demo1.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
/**
 * @description:
 * @author: Evan
 * @time: 2021/8/2 17:17
 */
@RestController
public class IndexController {
    @Value("${server.port}")
    private String port;
    @GetMapping("/hello")
    public String hello(){
        System.out.println("进入" + port + "服务器");
        return "返回的端口为：" + port;
    }
}

2 创建demo2服务

pom.xml

	4.0.0
	
		org.springframework.boot
		spring-boot-starter-parent
		2.5.3
		 
	
	com.demo
	demo2
	0.0.1-SNAPSHOT
	demo2
	Demo project for Spring Boot
	
		1.8
		2020.0.3
	
	
		
			org.springframework.boot
			spring-boot-starter-web
		
		
			org.springframework.cloud
			spring-cloud-starter-openfeign
		
		
		
			org.springframework.cloud
			spring-cloud-starter-netflix-eureka-client
		
		
			org.springframework.boot
			spring-boot-starter-test
			test
		
	
	
		
			
				org.springframework.cloud
				spring-cloud-dependencies
				${spring-cloud.version}
				pom
				import
			
		
	
	
		
			
				org.springframework.boot
				spring-boot-maven-plugin
			
		
	

application.yml

server:
  port: 8113
spring:
  application:
    name: ${APPLICATION_NAME:demo2}
eureka:
  client:
    fetch-registry: true
    register-with-eureka: true
    service-url:
       defaultZone: http://localhost:18880/eureka
  instance:
    instance-id: ${spring.cloud.client.ip-address}:${server.port}
    prefer-ip-address: true

DemoFeign.java

package com.demo.demo2.Feign;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import java.net.URI;
/**
 * @description:
 * @author: Evan
 * @time: 2021/8/2 17:34
 */
//@FeignClient(name = "DEMO1", url="EMPTY")
@FeignClient(name = "DEMO1", url="http://localhost:8111")
public interface DemoFeign {
    /**
     * 调用demo1的接口
     * @return
     */
    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    String hello();
    /**
     * 调用demo1的接口
     * @return
     */
    @RequestMapping(value = "/hello", method = RequestMethod.GET)
    String hello1(URI uri);
}

IndexController.java

package com.demo.demo2.controller;
import com.demo.demo2.Feign.DemoFeign;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import java.net.URI;
/**
 * @description:
 * @author: Evan
 * @time: 2021/8/2 17:33
 */
@RestController
public class IndexController {
    @Autowired
    private DemoFeign demoFeign;
    @GetMapping("/testFeign")
    public String testFeign(){
        System.out.println("在demo2服务中，调用demo1的服务");
        String resultStr = demoFeign.hello();
        System.out.println("在demo2服务中，调用demo1的服务，返回的结果：" + resultStr);
        return "在demo2服务中，调用demo1的服务，返回的结果：" + resultStr;
    }
    @GetMapping("/testFeign2")
    public String testFeign2(@RequestParam String server) throws Exception{
        String url = "";
        if("1".equals(server)){
            url = "http://localhost:8111";
        }else if("2".equals(server)){
            url = "http://localhost:8112";
        }
        System.out.println("在demo2服务中，调用demo1的服务" + url);
        String resultStr = demoFeign.hello1(new URI(url));
        System.out.println("在demo2服务中，调用demo1的服务，返回的结果：" + resultStr);
        return "在demo2服务中，调用demo1的服务，返回的结果：" + resultStr;
    }
}

测试

指定服务器ip

http://localhost:8113/testFeign2?server=1

返回【在demo2服务中，调用demo1的服务，返回的结果：返回的端口为：8111】

http://localhost:8113/testFeign2?server=2

返回【在demo2服务中，调用demo1的服务，返回的结果：返回的端口为：8112】

使用默认的地址

http://localhost:8113/testFeign

返回【在demo2服务中，调用demo1的服务，返回的结果：返回的端口为：8111】