pig4cloud中feign使用案例

准备调用的接口

 写好调用的接口以及错误处理类

package com.sensor.sellCabinet.feign;

import com.pig4cloud.pig.admin.api.dto.UserDTO;
import com.pig4cloud.pig.admin.api.feign.factory.RemoteLogServiceFallbackFactory;
import com.pig4cloud.pig.common.core.constant.SecurityConstants;
import com.pig4cloud.pig.common.core.constant.ServiceNameConstants;
import com.pig4cloud.pig.common.core.util.R;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.*;

@Service
@FeignClient(value = ServiceNameConstants.UMPS_SERVICE, fallbackFactory = AdminUserServiceFallbackFactory.class)
public interface AdminUserService {

    @PostMapping(value = "/user/mqAdd",produces = "application/json; charset=UTF-8")
    R addUser(@RequestBody UserDTO userDto, @RequestHeader(SecurityConstants.FROM) String from);


}

package com.sensor.sellCabinet.feign;

import com.pig4cloud.pig.admin.api.dto.UserDTO;
import com.pig4cloud.pig.common.core.util.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class AdminUserServiceFallbackImpl implements AdminUserService{


    @Override
    public R addUser(UserDTO userDto, String from) {
        log.error("调用mq账号同步 失败====");
        return null;
    }
}

package com.sensor.sellCabinet.feign;

import feign.hystrix.FallbackFactory;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Component;

@Slf4j
@Component
public class AdminUserServiceFallbackFactory implements FallbackFactory<AdminUserService> {
    @Override
    public AdminUserService create(Throwable throwable) {
        log.error(throwable.getLocalizedMessage());
        AdminUserServiceFallbackImpl service= new AdminUserServiceFallbackImpl();
        throwable.printStackTrace();
        return service;
    }
}

注入调用的地方

 将接口请求url设置放行  ，不然访问401、403啥的反正请求不到，反正提示没身份验证

 内部访问接口设置了一个标识  ，标识以外的请求拦截

/*
 *  Copyright (c) 2019-2020, 冷冷 (wangiegie@gmail.com).
 *  <p>
 *  Licensed under the GNU Lesser General Public License 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  <p>
 * https://www.gnu.org/licenses/lgpl.html
 *  <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.pig4cloud.pig.common.security.feign;

import cn.hutool.core.collection.CollUtil;
import com.pig4cloud.pig.common.core.constant.SecurityConstants;
import feign.RequestTemplate;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.security.oauth2.client.AccessTokenContextRelay;
import org.springframework.cloud.security.oauth2.client.feign.OAuth2FeignRequestInterceptor;
import org.springframework.security.oauth2.client.OAuth2ClientContext;
import org.springframework.security.oauth2.client.resource.OAuth2ProtectedResourceDetails;

import java.util.Collection;

/**
 * @author lengleng
 * @date 2019/2/1
 * 扩展OAuth2FeignRequestInterceptor
 */
@Slf4j
public class PigFeignClientInterceptor extends OAuth2FeignRequestInterceptor {
	private final OAuth2ClientContext oAuth2ClientContext;
	private final AccessTokenContextRelay accessTokenContextRelay;

	/**
	 * Default constructor which uses the provided OAuth2ClientContext and Bearer tokens
	 * within Authorization header
	 *
	 * @param oAuth2ClientContext     provided context
	 * @param resource                type of resource to be accessed
	 * @param accessTokenContextRelay
	 */
	public PigFeignClientInterceptor(OAuth2ClientContext oAuth2ClientContext
		, OAuth2ProtectedResourceDetails resource, AccessTokenContextRelay accessTokenContextRelay) {
		super(oAuth2ClientContext, resource);
		this.oAuth2ClientContext = oAuth2ClientContext;
		this.accessTokenContextRelay = accessTokenContextRelay;
	}


	/**
	 * Create a template with the header of provided name and extracted extract
	 * 1. 如果使用 非web 请求，header 区别
	 * 2. 根据authentication 还原请求token
	 *
	 * @param template
	 */
	@Override
	public void apply(RequestTemplate template) {
		Collection<String> fromHeader = template.headers().get(SecurityConstants.FROM);
		if (CollUtil.isNotEmpty(fromHeader) && fromHeader.contains(SecurityConstants.FROM_IN)) {
			return;
		}

		accessTokenContextRelay.copyToken();
		if (oAuth2ClientContext != null
			&& oAuth2ClientContext.getAccessToken() != null) {
			super.apply(template);
		}
	}
}