FeignClient如何通过配置变量调用配置文件url

通过配置变量调用配置文件url

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<Map<String, Object>> 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

<?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;
    }
}

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】

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】 

来源：https://blog.csdn.net/cai4561/article/details/105699194