标签：png json project 调用 http请求 配置 代码 支持 ota
feign是一种声明式，模板化的HTTP客户端，spring cloud对feign进行了增强，使其支持SpringMvc的相关注解，并整合了ribbon做负载均衡。在spring cloud中使用feign做HTTP远程服务请求，可以做到就像调用本地方法一样，完全感知不到是在调用远程方法，具体特性如下：
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.3.RELEASE</version> <relativePath/> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> <spring-cloud.version>Finchley.RELEASE</spring-cloud.version> </properties> <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>
<dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- Spring Cloud OpenFeign的Starter的依赖 --> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-openfeign</artifactId> </dependency> </dependencies>
<build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build>
import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.openfeign.EnableFeignClients; @SpringBootApplication @EnableFeignClients public class SpringCloudFeignApplication { public static void main(String[] args) { SpringApplication.run(SpringCloudFeignApplication.class, args); } }
可以看到启动类上加了 @EnableFeignClients 注解，意思是当该工程在启动的时候，会进行包扫描，扫描该启动类包以下，子包中所有带 @FeignClient 注解的类（包括启动类所在包），并进行处理。
HelloFeignService接口：
import cn.springcloud.book.feign.config.HelloFeignServiceConfig; import org.springframework.cloud.openfeign.FeignClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; //https://api.caiyunapp.com/v2/TAkhjf8d1nlSlspN/121.6544,25.1552/forecast.json 彩云天气API @FeignClient(name = "caiyunapp", url = "https://api.caiyunapp.com/v2/TAkhjf8d1nlSlspN/121.6544,25.1552", configuration = HelloFeignServiceConfig.class) public interface HelloFeignService { @RequestMapping(value = "/forecast.json", method = RequestMethod.GET) String searchRepo(); }
如上所示，@FeignClient注解手动指定了URL，最终会根据指定的URL和@RequestMapping对应的方法转换成完整的请求地址。如下：https://api.caiyunapp.com/v2/TAkhjf8d1nlSlspN/121.6544,25.1552/forecast.json
HelloFeignServiceConfig配置类：
import feign.Logger; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration public class HelloFeignServiceConfig { /** * Logger.Level 的具体级别如下： * NONE：不记录任何信息 * BASIC：仅记录请求方法、URL以及响应状态码和执行时间 * HEADERS：除了记录 BASIC级别的信息外，还会记录请求和响应的头信息 * FULL：记录所有请求与响应的明细，包括头信息、请求体、元数据 * * @return */ @Bean Logger.Level feignLoggerLevel() { return Logger.Level.FULL; } }
controller类：
import cn.springcloud.book.feign.service.HelloFeignService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController; @RestController public class HelloFeignController { @Autowired private HelloFeignService helloFeignService; // 服务消费者对位提供的服务 @GetMapping(value = "/search") public String searchGithubRepoByStr(@RequestParam("str") String queryStr) { return helloFeignService.searchRepo(queryStr); } }
如上所示，controller类中注入了上面编写的接口类，直接调用了相关方法。
2.1、执行命令：
mvn spring-boot:run
2.2、访问：losthost:8080/search/
说明访问成功！
标签：png json project 调用 http请求 配置 代码 支持 ota
原文地址：https://www.cnblogs.com/idoljames/p/11667938.html
