FeignClient服务调用案例

FeignClient服务调用案例，由A服务调用B服务，分别展示了get和post调用的各种传参方式。

A服务

• A服务FeignClient调用服务类FeignDemoService

package com.github.third.feign;

import com.github.common.util.Response;
import com.github.third.feign.fallback.FeignDemoServiceImpl;
import org.springframework.cloud.netflix.feign.FeignClient;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

/**
 * @Project：collection
 * @Package：com.github.third.feign
 * @Date：2019/3/22 17:30
 * @Author：songfayuan
 * @Address： 
 * @Description: FeignClient服务调用案例
 * @Modified By:
 */
@FeignClient(name = "upms-service", fallback = FeignDemoServiceImpl.class)
public interface FeignDemoService {

    /**
     * feign get 请求<单个参数请求>
     * @param params
     * @return
     */
    @GetMapping("/demo/noAuthorization/feignGetRequest1")
    Response feignGetRequest1(@RequestParam("params") String params);

    /**
     * feign get 请求<多参数请求>
     * @param params1
     * @param params2
     * @return
     */
    @GetMapping("/demo/noAuthorization/feignGetRequest")
    Response feignGetRequest(@RequestParam("params1") String params1, @RequestParam("params2") String params2);

    /**
     * feign get 请求<单个参数请求>
     * @return
     * @author songfayuan
     * @date 2019/03/25 11:19
     */
    @GetMapping("/demo/noAuthorization/feignGetRequest3/{params}")
    Response feignGetRequest3(@PathVariable("params") String params);

    /**
     * feign post 请求<单参、多参数请求>
     * @return
     */
    @PostMapping("/demo/noAuthorization/feignPostRequest")
    Response feignPostRequest(@RequestBody Map params);

    /**
     * feign post 请求<单参数请求>
     * @param params
     * @return
     */
    @PostMapping("/demo/noAuthorization/feignPostRequest2")
    Response feignPostRequest2(@RequestParam("params") String params);
}

• 异常回调类 FeignDemoServiceImpl

package com.github.third.feign.fallback;

import com.github.common.util.Response;
import com.github.third.feign.FeignDemoService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.Map;

/**
 * @Project：collection
 * @Package：com.github.third.feign.fallback
 * @Date：2019/3/22 17:30
 * @Author：songfayuan
 * @Address： 
 * @Description: FeignClient服务调用案例失败回调
 * @Modified By:
 */
@Slf4j
@Service
public class FeignDemoServiceImpl implements FeignDemoService {

    @Override
    public Response feignGetRequest1(String params) {
        log.warn("调用{}异常...", "/demo/noAuthorization/feignGetRequest1");
        return null;
    }

    @Override
    public Response feignGetRequest(String params1, String params2) {
        log.warn("调用{}异常...", "/demo/noAuthorization/feignGetRequest");
        return null;
    }

    @Override
    public Response feignGetRequest3(String params) {
        log.warn("调用{}异常...", "/demo/noAuthorization/feignGetRequest3");
        return null;
    }

    @Override
    public Response feignPostRequest(Map params) {
        log.warn("调用{}异常...", "/demo/noAuthorization/feignPostRequest");
        return null;
    }

    @Override
    public Response feignPostRequest2(String params) {
        log.warn("调用{}异常...", "/demo/noAuthorization/feignPostRequest2");
        return null;
    }
}

B服务

• 具体业务功能DemoController

package com.github.admin.controller.demo;

import com.github.common.util.Response;
import lombok.extern.slf4j.Slf4j;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.DisposableBean;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.support.atomic.RedisAtomicInteger;
import org.springframework.web.bind.annotation.*;

import java.util.*;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.TimeUnit;


/**
 * 描述：demo
 * @author songfayuan
 * 2017年8月31日下午2:07:19
 */
@Slf4j
@RestController
@RequestMapping("/demo")
public class DemoController {

	/**
	 * feign get 请求<单个参数请求>
	 * @param params
	 * @return
	 * @author songfayuan
	 * @date 2019/03/22 18:29
	 */
	@GetMapping("/noAuthorization/feignGetRequest1")
	public Response feignGetRequest1(@RequestParam("params") String params){
		log.info("请求参数params = {}", params);
		return Response.success(params);
	}

	/**
	 * feign get 请求<多参数请求>
	 * @param params1
	 * @param params2
	 * @return
	 * @author songfayuan
	 * @date 2019/03/22 18:29
	 */
	@GetMapping("/noAuthorization/feignGetRequest")
	public Response feignGetRequest(@RequestParam("params1") String params1, @RequestParam("params2") String params2){
		log.info("请求参数params1 = {}, params2 = {}", params1, params2);
		return Response.success(params1 + "&" + params2);
	}

	/**
	 * feign get 请求<单个参数请求>
	 * @return
	 * @author songfayuan
	 * @date 2019/03/25 11:19
	 */
	@GetMapping("/noAuthorization/feignGetRequest3/{params}")
	public Response feignGetRequest3(@PathVariable("params") String params){
		log.info("请求参数params = {}", params);
		return Response.success(params);
	}

	/**
	 * feign post 请求<单参、多参数请求>
	 * @param params
	 * @return
	 * @author songfayuan
	 * @date 2019/03/22 18:29
	 */
	@PostMapping("/noAuthorization/feignPostRequest")
	public Response feignPostRequest(@RequestBody Map params){
		log.info("请求参数params = {}", params);
		return Response.success(params);
	}

	/**
	 * feign post 请求<单参数请求>
	 * @param params
	 * @return
	 * @author songfayuan
	 * @date 2019/03/25 11:00
	 */
	@PostMapping("/noAuthorization/feignPostRequest2")
	public Response feignPostRequest2(@RequestParam("params") String params){
		log.info("请求参数params = {}", params);
		return Response.success(params);
	}

}

• 文中用到的Response类

package com.github.common.util;

import com.fasterxml.jackson.annotation.JsonInclude;

import java.io.Serializable;

/**
 * 响应信息主体
 *
 * @param 
 * @author songfayuan
 */
//@JsonInclude(JsonInclude.Include.NON_NULL)
public class Response implements Serializable {

    private static final long serialVersionUID = 1L;

    private static final int SUCCESS_CODE = 200;
    private static final String SUCCESS_MSG = "success";
    private static final int ERROR_CODE = 500;
    private static final String ERROR_MSG = "服务器内部异常，请联系技术人员"; //将error改成了内容信息

    public static final int NO_LOGIN = -1;
    public static final int SUCCESS = 200;
    public static final int FAIL = 500;
    public static final int NO_PERMISSION = 2;

    private String msg = "success";
    private int code = SUCCESS;
    private T data;

    public Response() {
        super();
    }

    public Response(T data) {
        super();
        this.data = data;
    }

    public Response(T data, String msg) {
        super();
        this.data = data;
        this.msg = msg;
    }

    public Response(int code, T data, String msg) {
        super();
        this.code = code;
        this.data = data;
        this.msg = msg;
    }

    public Response(int code, String msg) {
        super();
        this.code = code;
        this.msg = msg;
    }

    public Response(Throwable e) {
        super();
        this.msg = e.getMessage();
        this.code = FAIL;
    }

    public static Response success() {
        Response resp = new Response();
        resp.code = (SUCCESS_CODE);
        resp.msg = (SUCCESS_MSG);
        return resp;
    }

    public static Response successResponse(String msg) {
        Response resp = new Response();
        resp.code = SUCCESS_CODE;
        resp.msg = msg;
        return resp;
    }

    public static Response error() {
        Response resp = new Response();
        resp.code = (ERROR_CODE);
        resp.msg = (ERROR_MSG);
        return resp;
    }

    public static Response errorResponse(String msg) {
        Response resp = new Response();
        resp.code = ERROR_CODE;
        resp.msg = msg;
        return resp;
    }

    public static Response response(int code, String msg) {
        Response resp = new Response();
        resp.code = (code);
        resp.msg = (msg);
        return resp;
    }

    public static Response response(int code, String msg, Object data) {
        Response resp = new Response();
        resp.code = (code);
        resp.msg = (msg);
        resp.data = data;
        return resp;
    }

    public static Response success(Object data) {
        Response resp = new Response();
        resp.code = (SUCCESS_CODE);
        resp.msg = (SUCCESS_MSG);
        resp.data = data;
        return resp;
    }

    public static Response error(Object data) {
        Response resp = new Response();
        resp.code = (ERROR_CODE);
        resp.msg = (ERROR_MSG);
        resp.data = data;
        return resp;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public T getData() {
        return data;
    }

    public void setData(T data) {
        this.data = data;
    }
}