SpringCloud之Feign示例详解
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 以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持编程小技巧。 您可能感兴趣的文章:
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