spring cloud服务间调用feign

1.feign是spring cloud服务间相互调用的组件，声明式、模板化的HTTP客户端。类似的HttpURLConnection、Apache HttpComponnets、OkHttp3 、Netty都实现相同功能。

目录结构

pom.xml

<?xml version="1.0" encoding="UTF-8"?>

<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>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.5.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.test</groupId>

    <artifactId>feigtest</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>feigtest</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <java.version>1.8</java.version>

        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>

        <fastjson.version>1.2.32</fastjson.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-devtools</artifactId>

            <scope>runtime</scope>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.projectlombok</groupId>

            <artifactId>lombok</artifactId>

            <optional>true</optional>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <!--feign -->

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-openfeign</artifactId>

        </dependency>

        <!--引入这个包才能使用fegin-->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-web</artifactId>

        </dependency>

        <dependency>

        <groupId>com.alibaba</groupId>

        <artifactId>fastjson</artifactId>

        <version>${fastjson.version}</version>

        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-dependencies</artifactId>

                <version>${spring-cloud.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

</project>

application.yml

spring:

  application:

    name: service-feigntest

server:

  port: 8702

eureka:

  client:

    serviceUrl:

      #指向注册中心

      defaultZone: http://192.168.111.133:8888/eureka/

  instance:

    # 每间隔1s，向服务端发送一次心跳，证明自己依然”存活“

    lease-renewal-interval-in-seconds: 1

    # 告诉服务端，如果我2s之内没有给你发心跳，就代表我“死”了，将我踢出掉。

    lease-expiration-duration-in-seconds: 2

IHiService.java

package com.feigtest;

import org.springframework.cloud.openfeign.FeignClient;

import org.springframework.web.bind.annotation.PostMapping;

@FeignClient("service-hi")

public interface IHiService {

    @PostMapping("/hi")

    public String say();

}

FeigTestController.java

package com.feigtest;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.PostMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class FeigTestController {

    @Autowired

    IHiService hiService;

    @RequestMapping("/hifeign")

    public String getFeignService(){

        return hiService.say();

    }

}

FeigtestApplication

package com.feigtest;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.cloud.openfeign.EnableFeignClients;

@EnableEurekaClient

@SpringBootApplication

@EnableFeignClients

public class FeigtestApplication {

    public static void main(String[] args) {

        SpringApplication.run(FeigtestApplication.class, args);

    }

}

2.feign带token,服务调用时保持token不丢失。

package com.Interceptor;

import feign.RequestInterceptor;

import feign.RequestTemplate;

import org.springframework.context.annotation.Configuration;

import org.springframework.web.context.request.RequestContextHolder;

import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;

/**

 * Feign配置

 * 使用FeignClient进行服务间调用，传递headers信息

 */

@Configuration

public class FeignConfig implements RequestInterceptor {

    @Override

    public void apply(RequestTemplate requestTemplate) {

        ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();

        HttpServletRequest request = attributes.getRequest();

        //添加token

        requestTemplate.header("token", request.getHeader("token"));

    }

}

巴特西

spring cloud服务间调用feign

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