SpringCloud 学习(8)：SpringCloud中使用Feign

你的名字 2020-11-15 15:47 740阅读 0赞

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## 1.首先修改服务提供者： ##

![这里写图片描述][70]

*添加police实体

public class Police {
        private Integer id;
        private String name;
        private Integer age;
    
        public Integer getId() {
            return id;
        }
    
        public Police setId(Integer id) {
            this.id = id;
            return this;
        }
    
        public String getName() {
            return name;
        }
    
        public Police setName(String name) {
            this.name = name;
            return this;
        }
    
        public Integer getAge() {
            return age;
        }
    
        public Police setAge(Integer age) {
            this.age = age;
            return this;
        }
    
        @Override
        public String toString() {
            return "Police{" +
                    "id=" + id +
                    ", name='" + name + '\'' +
                    ", age=" + age +
                    '}';
        }
    }

*修改PoliceController

import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.servlet.http.HttpServletRequest;
    
    
    @RestController
    public class PoliceController {
        @RequestMapping("call")
        public String call(HttpServletRequest request) {
            return "call:" + request.getRequestURL().toString();
        }
    
        @RequestMapping("getPolice")
        public Police getPolice(@RequestParam("id") Integer id) {
            Police police = new Police()
                    .setId(id)
                    .setName("一号警察")
                    .setAge(24);
            return police;
        }
    
        @RequestMapping("addPolice")
        public Police addPolice(@RequestBody Police police) {
            return police;
        }
    }

## 2.修改服务调用者 ##

![这里写图片描述][70 1]

*引入fiegn依赖

<dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-feign</artifactId>
                <version>1.4.0.RELEASE</version>
            </dependency>

*开启FeignClient,修改启动类如下：

import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.builder.SpringApplicationBuilder;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    import org.springframework.cloud.netflix.feign.EnableFeignClients;
    
    
    @SpringBootApplication
    @EnableEurekaClient
    @EnableFeignClients  //*******开启FeignClient
    public class Application { 
        public static void main(String[] args) {
            new SpringApplicationBuilder(Application.class).web(true).run(args);
        }
    }

*编写Feign服务接口FeignService

import org.springframework.cloud.netflix.feign.FeignClient;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RequestParam;
    
    @FeignClient("police")  //指定服务ID
    public interface FeignService {
        @RequestMapping(method = RequestMethod.GET,value = "/call")
        public String call();
    
        @RequestMapping(method = RequestMethod.GET,value = "/getPolice")
        public Police getPolice(@RequestParam("id") Integer id);
    
        @RequestMapping(method = RequestMethod.POST, value = "/addPolice")
        public Police addPolice(@RequestBody Police police);
    }

*服务调用，修改PeopleController

import com.warrior.feign.FeignService;
    import com.warrior.feign.Police;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cloud.client.loadbalancer.LoadBalanced;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.client.RestTemplate;
    
    @RestController
    public class PeopleController {
    
        @Autowired
        private FeignService feignService;
    
        @RequestMapping(method = RequestMethod.GET,value = "call")
        public String call(){
          return feignService.call();
        }
    
        @RequestMapping(method = RequestMethod.GET,value = "getPolice")
        public Police getPolice(Integer id){
            return feignService.getPolice(id);
        }
    
    
        @RequestMapping(method = RequestMethod.GET,value = "addPolice")
        public Police addPolice(){
            Police police = new Police()
                    .setId(1)
                    .setAge(24)
                    .setName("二号警察");
            return feignService.addPolice(police);
        }
    }

[70]: /images/1605455229066.png
[70 1]: /images/1605455206946.png