FeignClient怎么通过配置变量调用配置文件url

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通过配置变量调用配置文件url

application.yml 配置文件配置参数

feign:  sys: Http://127.0.0.1:8777

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: 8111spring:  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: 8112spring:  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;@RestControllerpublic 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: 8113spring:  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;//@FeignClient(name = "DEMO1", url="EMPTY")@FeignClient(name = "DEMO1", url="http://localhost:8111")public interface DemoFeign {        @RequestMapping(value = "/hello", method = RequestMethod.GET)    String hello();        @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;@RestControllerpublic 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】 

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