feign的服务调用方法只需在服务消费者端声明服务提供者的service接口,然后调用接口即可。
feign自带负载均衡
1、声明的业务接口
package com.springcloud.com.springcloud.service;
import com.springcloud.enties.CommonResult;
import com.springcloud.enties.Payment;
import feign.Param;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
/**
* @author dc
* @date 2020/7/27 - 17:45
*/
@Component //注明该类为一个组件被spring容器扫描
@FeignClient("payment-provider") //注明为feign客户端
public interface IPaymentService {
//参数位置必须添加@RequestParam("id")
@GetMapping("/payment/second")
public CommonResult<Payment> doSecond(@RequestParam("id") Long id);
}
2、控制器
package com.springcloud.com.springcloud.controller;
import com.springcloud.com.springcloud.service.IPaymentService;
import com.springcloud.enties.CommonResult;
import com.springcloud.enties.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
/**
* @author dc
* @date 2020/7/27 - 17:54
*/
@RestController
@Slf4j
public class OrderFeignController {
@Resource
private IPaymentService paymentService;
@GetMapping("/feign/first")
public CommonResult<Payment> getPaymentById(long id){
System.out.println("我被访问了-----------");
return paymentService.doSecond(id);
}
}
3、主启动类
package com.springcloud.com.springcloud;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
/**
* @author dc
* @date 2020/7/27 - 17:41
*/
@SpringBootApplication
@Slf4j
@EnableFeignClients //激活feign客户端
public class OrderFeignMain81 {
public static void main(String[] args) {
SpringApplication.run(OrderFeignMain81.class, args);
}
}
4、服务提供者的控制器
package com.springcloud.controller;
import com.springcloud.enties.CommonResult;
import com.springcloud.enties.Payment;
import com.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
/**
* @author dc
* @date 2020/7/18 - 16:43
*/
@RestController
@Slf4j
public class PaymentController {
@Resource
private PaymentService paymentService;
@Value("${server.port}")
private String port;
@PostMapping("/payment/first")
//此处必须加上@RequestBody 注解,否则不能从上一个请求模块中获取payment值。
public CommonResult doFirst(@RequestBody Payment payment) {
System.out.println("==========================");
System.out.println("payment = " + payment);
int result = paymentService.addPayment(payment);
log.info("*******插入结果:" + result);
if (result > 0) {
return new CommonResult(200, "插入数据库成功 , port = " + port, result);
}else {
return new CommonResult(444, "插入数据库失败", null);
}
}
//这里必须添加@RequestParam("id")
@GetMapping("/payment/second")
public CommonResult doSecond(@RequestParam("id") Long id) {
Payment payment = paymentService.findPayment(id);
log.info("*******查找结果:" + payment);
if (payment != null) {
return new CommonResult(200, "数据查找成功 , port = " + port, payment);
}else {
return new CommonResult(444, "数据查找失败", payment);
}
}
}