示例中是Feign客户端在服务消费者中。实际上Feign客户端应该在服务提供者上，由服务提供者选择暴露接口，然后消费者引入相应接口jar包，接着可以像调用自己方法一样调用远程方法。
添加依赖
<?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 http://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>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>org.baozi</groupId>
<artifactId>cloud-feign</artifactId>
<version>1.0</version>
<packaging>pom</packaging>
<modules>
<module>feign-registration</module>
<module>feign-provider</module>
<module>feign-consumer</module>
</modules>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</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-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</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>
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.baozi</groupId>
<artifactId>cloud-feign</artifactId>
<version>1.0</version>
<relativePath>..</relativePath>
</parent>
<artifactId>feign-registration</artifactId>
</project>
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.baozi</groupId>
<artifactId>cloud-feign</artifactId>
<version>1.0</version>
<relativePath>..</relativePath>
</parent>
<artifactId>feign-provider</artifactId>
</project>
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.baozi</groupId>
<artifactId>cloud-feign</artifactId>
<version>1.0</version>
<relativePath>..</relativePath>
</parent>
<artifactId>feign-consumer</artifactId>
</project>
注册中心
spring.application.name=feign-registration
server.port=9000
eureka.instance.hostname=localhost
eureka.client.register-with-eureka=false
eureka.client.fetch-registry=false
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@SpringBootApplication
@EnableEurekaServer
public class FeignRegistrationApplication {
public static void main(String[] args) {
SpringApplication.run(FeignRegistrationApplication.class, args);
}
}
服务提供者
spring.application.name=feign-provider
server.port=10000
eureka.client.service-url.defaultZone=http://localhost:9000/eureka
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@SpringBootApplication
@EnableDiscoveryClient
public class FeignProviderApplication {
public static void main(String[] args) {
SpringApplication.run(FeignProviderApplication.class, args);
}
}
import org.springframework.web.bind.annotation.*;
@RestController
public class ProviderController {
// 传统形式 ------------------------------
@GetMapping("/m1")
public String m1(@RequestParam String id) {
return "m1: " + id;
}
@PostMapping("/m2")
public String m2(@RequestParam String id) {
return "m2: " + id;
}
@PostMapping("/m3")
public String m3(@RequestBody String id) {
return "m3: " + id;
}
// REST形式 ------------------------------
@GetMapping("/m4/{id}")
public String m4(@PathVariable String id) {
return "m4: " + id;
}
@PostMapping("/m5/{id}")
public String m5(@PathVariable String id) {
return "m5: " + id;
}
@PostMapping("/m6")
public String m6(@RequestBody String id) {
return "m6: " + id;
}
// 传统形式参数可以使用Map ------------------------------
@GetMapping("/map")
String map(@RequestParam String id) {
return "map: " + id;
}
}
服务消费者
spring.application.name=feign-consumer
server.port=11000
eureka.client.service-url.defaultZone=http://localhost:9000/eureka
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients // RestTemplate和@LoadBalancer都不需要了
public class FeignConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(FeignConsumerApplication.class, args);
}
}
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;
import java.util.Map;
@FeignClient("feign-provider") // 绑定服务提供方，名称要和服务提供方的spring.application.name一致
public interface IProviderController {
// 传统形式 ------------------------------
@GetMapping("/m1")
String m1(@RequestParam("id") String id);
@PostMapping("/m2")
String m2(@RequestParam("id") String id);
@PostMapping("/m3")
String m3(@RequestBody String id);
// REST形式 ------------------------------
@GetMapping("/m4/{id}")
String m4(@PathVariable("id") String id);
@PostMapping("/m5/{id}")
String m5(@PathVariable("id") String id);
@PostMapping("/m6")
String m6(@RequestBody String id);
// 传统形式参数可以使用Map ------------------------------
@GetMapping("/map")
String map(@RequestParam Map<String, Object> map);
}
import org.baozi.iprovider.IProviderController;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import java.util.HashMap;
import java.util.Map;
@RestController
public class ConsumerController {
@Autowired
private IProviderController iprovider;
// 传统形式 ------------------------------
@GetMapping("/m1/{id}")
public String m1(@PathVariable String id) {
return iprovider.m1(id);
}
@GetMapping("/m2/{id}")
public String m2(@PathVariable String id) {
return iprovider.m2(id);
}
@GetMapping("/m3/{id}")
public String m3(@PathVariable String id) {
return iprovider.m3(id);
}
// REST形式 ------------------------------
@GetMapping("/m4/{id}")
public String m4(@PathVariable String id) {
return iprovider.m4(id);
}
@GetMapping("/m5/{id}")
public String m5(@PathVariable String id) {
return iprovider.m5(id);
}
@GetMapping("/m6/{id}")
public String m6(@PathVariable String id) {
return iprovider.m6(id);
}
// 传统形式参数可以使用Map ------------------------------
@GetMapping("/map/{id}")
public String map(@PathVariable String id) {
Map<String, Object> map = new HashMap<>();
map.put("id", id);
return iprovider.map(map);
}
}
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