<properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Hoxton.SR6</spring-cloud.version>
        <spring-cloud-alibaba.version>2.2.1.RELEASE</spring-cloud-alibaba.version>
    </properties>
    <dependencies>
        <!--fegin-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>

2.1.2編寫FeignClient的接口, 并加@FeignCleint 注解

url寫死在接口中不方便，可以使用動態(tài)參數(shù)配置，只需要在配置文件中添加key為feign.client.url的路徑。這里使用是單體模式，如果分布式項目中配置多個url管理起來非常費事，就需要升級使用注冊中心來解決。

import com.example.vo.DepartVO;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.*;
import java.util.List;
// 注意，接口名與方法名可以隨意
// 參數(shù)指定了要訪問的提供者微服務名稱
//@FeignClient(url ="http://127.0.0.1:8081", value="abcmsc-provider-depart", path = "/provider/depart")
@FeignClient(url ="${feign.client.url}", value="abcmsc-provider-depart", path = "/provider/depart")
public interface DepartService {
    @PostMapping("/save")
    boolean saveDepart(@RequestBody DepartVO depart);
    @DeleteMapping("/del/{id}")
    boolean removeDepartById(@PathVariable("id") int id);
    @PutMapping("/update")
    boolean modifyDepart(@RequestBody DepartVO depart);
    @GetMapping("/get/{id}")
    DepartVO getDepartById(@PathVariable("id") int id);
    @GetMapping("/list")
    List<DepartVO> listAllDeparts();
}

2.2 消費端使用fegin接口

2.2.1在消費者端添加feign接口依賴

2.2.2在消費者端配置文件中添加 feign.client.url

指定服務端的url和端口

2.2.3在消費者端啟動類中添加@EnableFeignClients

開啟Feign功能：此注解會掃描啟動類所在的包及其子包下面@FeignClient標注的接口，將其交給spring容器管理，方便后續(xù)使用。

2.2.4在消費者端使用fegin接口

需要在哪里使用接口直接注入后即可使用

import com.example.providerapi.DepartService;
import com.example.vo.DepartVO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("/consumer/depart")
public class DepartController {
    @Autowired
    private DepartService departService;
    @PostMapping("/save")
    public boolean saveHandle(@RequestBody DepartVO depart) {
 
        return departService.saveDepart(depart);
    }
    @DeleteMapping("/del/{id}")
    public void deleteHandle(@PathVariable("id") int id) {
        departService.removeDepartById(id);
    }
    @PutMapping("/update")
    public void updateHandle(@RequestBody DepartVO depart) {
        departService.modifyDepart(depart);
    }
    @GetMapping("/get/{id}")
    public DepartVO getHandle(@PathVariable("id") int id) {
        return departService.getDepartById(id);
    }
    @GetMapping("/list")
    public List<DepartVO> listHandle() {
        return departService.listAllDeparts();
    }
}