SpringCloud之Feign示例详解,springcloudfeign男篮世界杯

SpringCloud之Feign示例详解,springcloudfeign

Feign简介

Feign 是一个声明web服务客户端,这便得编写web服务客户端更容易,使用Feign 创建一个接口并对它进行注解,它具有可插拔的注解支持包括Feign注解与JAX-RS注解,Feign还支持可插拔的编码器与解码器,Spring Cloud 增加了对 Spring MVC的注解,Spring Web 默认使用了HttpMessageConverters, Spring Cloud 集成 Ribbon 和 Eureka 提供的负载均衡的HTTP客户端 Feign.

声明式REST客户端:Feign

先要启动eureka_register_service工程(注册中心)和biz-service-0工程(服务生产者)

创建一个maven工程eureka_feign_client

pom.xml

<parent>

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

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

<version>1.4.3.RELEASE</version>

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

</parent>

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

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

</properties>

<dependencies>

  <dependency>

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

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

  </dependency>

  <dependency>

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

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

  </dependency>

  <dependency>

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

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

  </dependency>

  <dependency>

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

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

    <scope>test</scope>

  </dependency>

</dependencies>

<dependencyManagement>

  <dependencies>

    <dependency>

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

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

  <version>Brixton.SR5</version>

  <type>pom</type>

  <scope>import</scope>

</dependency>

  </dependencies>

</dependencyManagement> 

在应用主类中通过@EnableFeignClients注解开启Feign功能

启动文件FeignApplication.java

@SpringBootApplication

@EnableDiscoveryClient

@EnableFeignClients

public class FeignApplication {

  public static void main(String[] args) {

    SpringApplication.run(FeignApplication.class, args);

  }
}

定义服务接口类UserClient.java

使用@FeignClient("biz-service-0")注解来绑定该接口对应biz-service-0服务

@FeignClient("biz-service-0")

public interface UserClient { 

  @RequestMapping(method = RequestMethod.GET, value = "/getuser")

  public User getuserinfo();   

  @RequestMapping(method = RequestMethod.GET, value = "/getuser")

  public String getuserinfostr();   

  @RequestMapping(method = RequestMethod.GET, value = "/info")

  public String info();
} 

在web层中调用上面定义的UserController,具体如下

@RestController

public class UserController {

  @Autowired

  UserClient userClient;

  @RequestMapping(value = "/getuserinfo", method = RequestMethod.GET)

  public User getuserinfo() {

    return userClient.getuserinfo();

  }

  @RequestMapping(value = "/getuserinfostr", method = RequestMethod.GET)

  public String getuserinfostr() {

    return userClient.getuserinfostr();
  }

  @RequestMapping(value = "/info", method = RequestMethod.GET)

  public String info() {

    return userClient.info();

  }
} 

application.properties配置变量

spring.application.name=feign-consumer

server.port=8004

eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/ 

访问 http://127.0.0.1:8004/getuserinfo

总结:

其实通过Feign封装了HTTP调用服务方法,使得客户端像调用本地方法那样直接调用方法,类似Dubbo中暴露远程服务的方式,区别在于Dubbo是基于私有二进制协议,而Feign本质上还是个HTTP客户端

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http://www.bkjia.com/Javabc/1294343.htmlwww.bkjia.comtruehttp://www.bkjia.com/Javabc/1294343.htmlTechArticleSpringCloud之Feign示例详解,springcloudfeign Feign简介 Feign 是一个声明web服务客户端,这便得编写web服务客户端更容易,使用Feign 创建一个接口并...

Feign简介

 

Feign 是一个声明web服务客户端,这便得编写web服务客户端更容易,使用Feign 创建一个接口并对它进行注解,它具有可插拔的注解支持包括Feign注解与JAX-RS注解,Feign还支持可插拔的编码器与解码器,Spring Cloud 增加了对 Spring MVC的注解,Spring Web 默认使用了HttpMessageConverters, Spring Cloud 集成 Ribbon 和 Eureka 提供的负载均衡的HTTP客户端 Feign.

 

 

声明式REST客户端:Feign

 

先要启动eureka_register_service工程(注册中心)和biz-service-0工程(服务生产者)

 

 

创建一个maven工程eureka_feign_client

pom.xml

 

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<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-feign</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>
<dependencyManagement>
    <dependencies>
        <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-dependencies</artifactId>
    <version>Brixton.SR5</version>
    <type>pom</type>
    <scope>import</scope>
</dependency>
    </dependencies>
</dependencyManagement>

 

 

在应用主类中通过@EnableFeignClients注解开启Feign功能

启动文件FeignApplication.java

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@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class FeignApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(FeignApplication.class, args);
    }
 
}

 

定义服务接口类UserClient.java

使用@FeignClient("biz-service-0")注解来绑定该接口对应biz-service-0服务

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@FeignClient("biz-service-0")
public interface UserClient {
 
    @RequestMapping(method = RequestMethod.GET, value = "/getuser")
    public User getuserinfo();
     
    @RequestMapping(method = RequestMethod.GET, value = "/getuser")
    public String getuserinfostr();
     
    @RequestMapping(method = RequestMethod.GET, value = "/info")
    public  String  info();
 
}

 

在web层中调用上面定义的UserController,具体如下

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@RestController
public class UserController {
 
    @Autowired
    UserClient userClient;
 
    @RequestMapping(value = "/getuserinfo", method = RequestMethod.GET)
    public User getuserinfo() {
        return userClient.getuserinfo();
    }
     
    @RequestMapping(value = "/getuserinfostr", method = RequestMethod.GET)
    public String getuserinfostr() {
        return userClient.getuserinfostr();
    }
     
    @RequestMapping(value = "/info", method = RequestMethod.GET)
    public String info() {
        return userClient.info();
    }
 
 
}

application.properties配置变量

 

 

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spring.application.name=feign-consumer
server.port=8004
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/

 

 

 

访问 http://127.0.0.1:8004/getuserinfo

 

 

本文由美洲杯赌球发布于计算机教程,转载请注明出处:SpringCloud之Feign示例详解,springcloudfeign男篮世界杯

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