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springAlibaba实践(10)----OpenFegin配置

 2 years ago
source link: http://www.blogjava.net/zzsuje/archive/2022/05/06/450738.html
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springAlibaba实践(10)----OpenFegin配置

Feign与注册中心

声明式远程调用
feign是一个声明式的HTTP客户端，他的目的就是让远程调用更加简单。
给远程服务发的是HTTP请求。
想要获取当前会员领取到的所有优惠券。先去注册中心找优惠券服务，
注册中心调一台优惠券服务器给会员，会员服务器发送请求给这台优
惠券服务器，然后对方响应。
10.1 引入openfeign依赖
会员服务想要远程调用优惠券服务，只需要给会员服务里引入
openfeign依赖，他就有了远程调用其他服务的能力。
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
10.2 在coupon服务(被调用服务)中修改如下的内容
@RequestMapping("coupon/coupon")
public class CouponController {
    @Autowired
    private CouponService couponService;
    @RequestMapping("/member/list")
    public R membercoupons(){    //全系统的所有返回都返回R
        // 应该去数据库查用户对于的优惠券，但这个我们简化了，不去数据库查了，构造了一个优惠券给他返回
        CouponEntity couponEntity = new CouponEntity();
        couponEntity.setCouponName("满100减10");//优惠券的名字
        return R.ok().put("coupons",Arrays.asList(couponEntity));
    }

10.3 这样我们准备好了优惠券的调用内容

在member的配置类上加注解@EnableFeignClients(basePackages="com.yxj.gulimall.member.feign")，
告诉spring这里面是一个远程调用客户端，member要调用的接口
package com.yxj.gulimall.member;
import org.mybatis.spring.annotation.MapperScan;
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
@MapperScan("com.yxj.gulimall.member.dao")
@EnableDiscoveryClient
@EnableFeignClients(basePackages="com.yxj.gulimall.member.feign")
public class GulimallMemberApplication {
    public static void main(String[] args) {
        SpringApplication.run(GulimallMemberApplication.class, args);
    }
}

10.4 那么要调用什么东西呢？就是我
们刚才写的优惠券的功能，
复制函数部分，在member的com.yxj.gulimall.member.feign包下新建类：
package com.yxj.gulimall.member.feign;
import com.yxj.common.utils.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;
@FeignClient("gulimall-coupon") //告诉spring cloud这个接口是一个远程客户端，要调用coupon服务，再去调用coupon服务/coupon/coupon/member/list对应的方法
public interface CouponFeignService {
    @RequestMapping("/coupon/coupon/member/list") 
    public R membercoupons();//得到一个R对象
}
10.5 然后我们在member的控制层写一个测试请求
@RestController
@RequestMapping("member/member")
public class MemberController {
    @Autowired
    private MemberService memberService;
    @Autowired
    CouponFeignService couponFeignService;
    @RequestMapping("/coupons")
    public R test(){
        MemberEntity memberEntity = new MemberEntity();
        memberEntity.setNickname("张三");
        R membercoupons = couponFeignService.membercoupons(); //假设张三去数据库查了后返回了张三的优惠券信息
        // 打印会员和优惠券信息
        return R.ok().put("member",memberEntity).put("coupons",membercoupons.get("coupons"));
    }
10.6 重新启动服务
http://localhost:8000/member/member/coupons
{"msg":"success","code":0,"coupons":[{"id":null,"couponType":null,"couponImg":null,"couponName":"满100减10","num":null,"amount":null,"perLimit":null,"minPoint":null,"startTime":null,"endTime":null,"useType":null,"note":null,"publishCount":null,"useCount":null,"receiveCount":null,"enableStartTime":null,"enableEndTime":null,"code":null,"memberLevel":null,"publish":null}],"member":{"id":null,"levelId":null,"username":null,"password":null,"nickname":"张三","mobile":null,"email":null,"header":null,"gender":null,"birth":null,"city":null,"job":null,"sign":null,"sourceType":null,"integration":null,"growth":null,"status":null,"createTime":null}}
10.7 上面内容很重要，我们停留5分钟体会一下
coupon里的R.ok()是什么 # coupon里的控制层就是new了个couponEntity然后放到hashmap（R）里而已。
public class R extends HashMap<String, Object> {
    public static R ok() {
        return new R();
    }
    public R put(String key, Object value) {
        super.put(key, value);
        return this;
    }
}

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