SpringCloud使用Feign实现动态路由操作
目录
- 一、理解及原理
- 1.1理解
- 1.2原理
- 二、Feign搭建实现步骤
- 三、配置文件(pom.xml)
- 三、程序代码
- 四、结果演示
一、理解及原理
1.1理解
Feign
基于接口 + 注解的方式,一个http请求调用的轻量级框架
Feign是Netflix开发的声明式、模板化的HTTP客户端, Feign可以帮助我们更快捷、优雅地调用HTTP API。
Feign是一种声明式、模板化的HTTP客户端(仅在Application Client中使用)。声明式调用是指,就像调用本地方法一样调用远程方法,无需感知操作远程http请求
1.2原理
二、Feign搭建实现步骤
- 创建Springboot基础项目
- 在注册中心(Eureka)配置的基础上,进行配置Feign
三、配置文件(pom.xml)
基础配置:
<dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency>
整体:
<dependencies> <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> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> <version>RELEASE</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId> </dependency> <dependency> <groupId>org.freemarker</groupId> <artifactId>freemarker</artifactId> <version>2.3.30</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> <scope>runtime</scope> </dependency> <!-- Swagger --> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.4.0</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.4.0</version> </dependency> <dependency> <groupId>com.github.xiaoymin</groupId> <artifactId>swagger-bootstrap-ui</artifactId> <version>1.8.7</version> </dependency> <!--添加lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>RELEASE</version> <scope>compile</scope> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>20.0</version> </dependency> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>19.0</version> <scope>compile</scope> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.2</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <!--pagehelper分页--> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper-spring-boot-starter</artifactId> <version>1.2.11</version> </dependency> <dependency> <groupId>commons-codec</groupId> <artifactId>commons-codec</artifactId> <version>1.11</version> </dependency> <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.6</version> </dependency> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.6</version> </dependency> <!--验证码https://blog.csdn.net/qq_41853447/article/details/105893567--> <dependency> <groupId>com.github.whvcse</groupId> <artifactId>easy-captcha</artifactId> <version>1.6.2</version> </dependency> <!--security权限管理--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> </dependencies>
三、程序代码
在启动类上加上@EnableFeignClients,开启Feign的应用
@EnableEurekaServer @EnableSwagger2 @SpringBootApplication @EnableFeignClients(basePackages = "com.personal.pserver") public class PserverApplication { public static void main(String[] args) { SpringApplication.run(PserverApplication.class, args); System.out.println("========================person-server已启动========================"); } }
启动类添加完成之后,在指定需要访问的service注册使用,
见其他博主讲解:
在通过Feign来实现远程服务调用时,需要提供一个本地接口来继承服务标准工程提供的服务接口。这个本地接口不需要给予任何实现,在底层Spring容器会为这个接口提供一个基于JDK实现的代理对象,这个代理对象由Feign技术提供具体的HandlerInterceptor逻辑,实现远程的调用。实现过程类似通过代码调用LoadBalancerClient实现的Rest远程访问。
而本地接口继承服务标准接口后,需要提供注解@FeignClient,注解的属性name代表当前接口要调用的远程服务的应用命名。
@RestController @Api(tags = "平台基本信息管理") @RequestMapping("/v1/pserver/platform/manager") public class PlatformController { @Autowired private PPlatformService platformService; @ApiOperation(value = "获取平台基本信息", notes = "获取平台基本信息", httpMethod = "GET") @RequestMapping(value = "/findPlatformInfo",method = RequestMethod.GET) public PPlatform findPlatformInfo(@RequestParam("platformId") String platformId) { PPlatform pPlatform = platformService.findOnePlatformById(platformId); return pPlatform; } }
@FeignClient(name="p-platform-service") public interface PPlatformService { /*** * 获取平台基本信息 * @param platformId * @return */ @RequestMapping(value="/findPlatformInfo",method = RequestMethod.GET) PPlatform findOnePlatformById(@RequestParam(value="platformId") String platformId); }
四、结果演示
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