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FeignClient调用指定的动态URL

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FeignClient调用指定的动态URL

1 创建demo1服务

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.5.3</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.demo</groupId>
	<artifactId>demo1</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>demo1</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
		<spring-cloud.version>2020.0.3</spring-cloud.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-openfeign</artifactId>
		</dependency>

		<!-- eureka -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

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

</project>

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;
    }
}

以不同的端口，来启动demo1

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-VkUC9kBR-1627905017557)(F:\黑格\pics\image-20210802194514303.png)]

2 创建demo2服务

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.5.3</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.demo</groupId>
	<artifactId>demo2</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>demo2</name>
	<description>Demo project for Spring Boot</description>
	<properties>
		<java.version>1.8</java.version>
		<spring-cloud.version>2020.0.3</spring-cloud.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-openfeign</artifactId>
		</dependency>

		<!-- eureka -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

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

</project>

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】
- 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】

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