springcloud Feign的使用

在A中pom.xml引入jar

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

启动类加上注解@EnableFeignClients

package com.hlvy.order;

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
public class OrderApplication {

	public static void main(String[] args) {
		SpringApplication.run(OrderApplication.class, args);
	}
}

接着写个接口通过接口调用 

package com.hlvy.order.client;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * ProductClient
 *
 * @author heng
 **/
@FeignClient(name = "hlvyclient")//要调用B服务应用名称
public interface ProductClients {

    @RequestMapping("/httpclien/httpstr")  //这里的/httpclien/httpstr对应的是B的controller访问路径
    String productMsg();
}

最后

package com.hlvy.order.controller;

import com.hlvy.order.client.ProductClients;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * HttpClient
 *
 * @author heng
 **/
@RestController
@RequestMapping("client")
@Slf4j
public class HttpClient {


    @Autowired
    private ProductClients productClients;

    @RequestMapping("clitest")
    public String hclient(){  //跨服务调用
       
      String msg =  productClients.productMsg();
      log.info(msg+"------------------------------------------------");
        return msg;
    }
}

带参数传递使用@RequestBody

A服务是调用B服务方法

B服务Controller方法定义

  /**
     * 获取商品列表
     * @param stringList
     * @return
     */
    @PostMapping("productInfoList")
    public List<ProductInfo> productInfoList(@RequestBody List<String> stringList ){
        return  productService.findList(stringList);
    }

A服务方法

package com.hlvy.order.client;

import com.hlvy.order.entity.ProductInfo;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

/**
 * ProductClient
 *
 * @author heng
 **/
@FeignClient(name = "product")
public interface ProductInfoc {

    @PostMapping("/product/productInfoList")
    List<ProductInfo> productMsg(@RequestBody  List<String> list);
}

A服务调用页面

package com.hlvy.order.controller;

import com.hlvy.order.client.ProductClients;
import com.hlvy.order.client.ProductInfoc;
import com.hlvy.order.entity.ProductInfo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;

/**
 * HttpClient
 *
 * @author heng
 **/
@RestController
@RequestMapping("client")
@Slf4j
public class HttpClient {
    @Autowired
    private ProductInfoc productInfoc;

    
    @RequestMapping("prostr")
    public String prostr(){  //跨服务调用

        List<ProductInfo> list =  productInfoc.productMsg(Arrays.asList("157875196366160022","157875227953464068"));
        System.err.println(list.size());
        log.info(list+"------------------------------------------------");
        System.out.println(list.stream().map(ProductInfo::getProductName).collect(Collectors.toList()));
        return list.stream().map(ProductInfo::getProductName).collect(Collectors.toList()).toString();
    }


}

注意如果使用了多模块化需要加上

@EnableFeignClients(basePackages = "com.hlvy.product.client")在启动类上basePackages =client存放路径