Feign 的简单使用(2) 请求时附带请求头

依赖:

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

全部依赖:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.icil</groupId>
    <artifactId>milestone-push-service</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>milestone-push-service</name>
    <url>http://maven.apache.org</url>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.4.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <slf4j.version>1.7.23</slf4j.version> 
        <!-- <logback.version>1.2.1</logback.version> -->
    </properties>
    <dependencies>
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
            <version>2.0.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zipkin</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-rest</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

        <!-- quartz -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-quartz</artifactId>
        </dependency>

        <!-- apahce poi -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.15</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.15</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>3.15</version>
        </dependency>


        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.16.16</version>
        </dependency>


        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.24</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
            <version>2.6.5</version>
        </dependency>

        <dependency>
            <!-- Testing starter -->
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
        </dependency>

        <!-- maven plugins -->
        <dependency>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-dependency-plugin</artifactId>
            <version>3.0.2</version>

        </dependency>

        <!-- sea add 2018-08-13 -->
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>2.0.2-beta</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/javax.mail/mail -->
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.5.0-b01</version>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.8.5</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.5</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.8.0</version>
        </dependency>

    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RC2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>

    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>
</project>

 

方式１：（ (整合eureka)）

 

配置:  //添加retry

@Configuration
public class FeignConfig {

    @Autowired
    private ObjectFactory<HttpMessageConverters> messageConverters;

    // this(100, SECONDS.toMillis(1), 5);

    @Bean
    public Retryer feignRetryer(){
        return new Retryer.Default(100, TimeUnit.SECONDS.toMillis(1),3);
    }

    @Bean
    public Encoder feignFormEncoder() {
        return new SpringFormEncoder(new SpringEncoder(messageConverters));
    }

    @Bean
    public Request.Options options() {
        return new Request.Options(60000, 60000);}

    /**
     * 转发请求头
     * @return
     */
    private final Set<String> notAllowHeaders = Sets.newHashSet("content-length","content-type");

    @Bean
    public RequestInterceptor getRequestInterceptor() {
        return new RequestInterceptor() {
            @Override
            public void apply(RequestTemplate requestTemplate) {
                //获取你需要传递的头信息
                HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest();
                Enumeration<String> requestHeader = request.getHeaderNames();
                while (requestHeader.hasMoreElements())
                {
                    String key = requestHeader.nextElement();
                    String value = request.getHeader(key);
                    if(!notAllowHeaders.contains(key.toLowerCase())){
                        requestTemplate.header(key,value);
                    }
                }
            }
        };
    }
}

 

 

 

 

使用: (整合eureka)

@FeignClient(name = "tracking-milestone-service", configuration = FeignConfig.class)
public interface TrackingServiceClient {

    @RequestMapping(value = "/ws/search/orders", method = RequestMethod.GET)
    public ResponseEntity<JSONObject> searchByTypesAndNumbers(@RequestParam("type") String type,
            @RequestParam("customer") String customer, @RequestParam("status") JSONArray status,
            @RequestParam("fromTime") String fromTime, @RequestParam("toTime") String toTime,
            @RequestParam("numberFromTime") String numberFromTime, @RequestParam("numberToTime") String numberToTime);

}

 

方式２: 调用第三方API

使用:

@FeignClient(name = "wechatApi",url = "https://api.weixin.qq.com")
public interface WechatFeignClient {
    @RequestMapping("/sns/oauth2/access_token")
    ResponseEntity<String> accessToken(@RequestParam String appid, @RequestParam String secret, @RequestParam String code, @RequestParam String grant_type);
    

}

 

 

 

Spring Cloud Feign 请求时附带请求头：

原文：https://blog.csdn.net/qq_37143673/article/details/109090966

Feign 在请求时是不会将 request 的请求头带着请求的，导致假如 Feign 调用的接口需要请求头的信息，比如当前用户的 token 之类的就获取不到，可以通过自定义 RequestInterceptor解决这个问题。

FeignConfiguration

通过实现 Feign 的 RequestInterceptor 将从上下文中获取到的请求头信息循环设置到 Feign 请求头中。

@Configuration
public class FeignConfiguration implements RequestInterceptor {
    private final Set<String> notAllowHeaders = Sets.newHashSet("content-length","content-type");

    @Override
    public void apply(RequestTemplate requestTemplate) {
        HttpServletRequest request = SpringContextUtils.getHttpServletRequest();
        Enumeration<String> headerNames = request.getHeaderNames();
        if (headerNames != null) {
            while (headerNames.hasMoreElements()) {
                String name = headerNames.nextElement();
                String values = request.getHeader(name);
                if(!notAllowHeaders.contains(name.toLowerCase())){
                    requestTemplate.header(name, values);
                }
            }
        }
    }
}

 

 

使用

通过 configuration = FeignConfiguration.class 指定这次 Feign 请求走哪种配置

@FeignClient(name = "admin", contextId = "factoryPlmseriesRelation", configuration = FeignConfiguration.class)
//@FeignClient(name = "admin2", contextId = "factoryPlmseriesRelation", url = "http://127.0.0.1:8582/", configuration = FeignConfiguration.class)
public interface FeignFactoryPlmseriesRelationService {

    /**
     * 根据当前用户，获取工厂与PLM关联关系
     * @return
     */
    @GetMapping(value = "/factoryPlmseriesRelation/getFactoryPlmseriesRelation")
    ErrorMsg<List<FactoryPlmseriesRelationVo>> getFactoryPlmseriesRelation();

}

 

配置修改

主要是 hystrix.command.default.execution.isolation 后面的配置，需要将 hystrix 配置为信号量模式，否则会出现由于隔离策略导致获取不到请求头

 

# ribbon 配置
ribbon:
  OkToRetryOnAllOperations: false #对所有操作请求都进行重试,默认false
  ReadTimeout: 5000   #负载均衡超时时间，默认值5000
  ConnectTimeout: 5000 #ribbon请求连接的超时时间，默认值2000
  MaxAutoRetries: 0     #对当前实例的重试次数，默认0
  MaxAutoRetriesNextServer: 1 #对切换实例的重试次数，默认1
# hystrix 配置
hystrix:
  command:
    default:  #default全局有效，service id指定应用有效
      execution:
        timeout:
          #是否开启超时熔断
          enabled: true
        isolation:
          thread:
            timeoutInMilliseconds: 10000 #断路器超时时间，默认1000ms
          # hystrix 隔离模式改为信号量模式，feign 才能获取到父线程中的请求头
          strategy: SEMAPHORE
          # 允许的并发量，默认值为 10
          semaphore:
            maxConcurrentRequests: 100
原文链接：https://blog.csdn.net/qq_37143673/article/details/109090966