以我个人写的博客系统为例，请求其它微服务API。
一、添加Maven依赖
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| <dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
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二、启动类增加@EnableFeignClients
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| package com.springcloud.blog;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class BlogAdminApplication {
public static void main(String[] args) {
SpringApplication.run(BlogRibbonClientApplication.class, args);
}
}
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三、编写服务接口类
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| package com.springcloud.blog.example;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
@FeignClient("blog-api")
public interface FeignTestService {
@GetMapping("/juhe/getIpInfo")
String getIpInfo(@RequestParam String ip);
}
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特别注意:
@FeignClient(“blog-api”),其中的blog-api必须是在Eureka Server注册的服务实例。
而对应的@RequestMapping的请求类型必须要写准确，Get请求就写Get，Post请求就写Post，这是其一。
还有就是请求参数是地址栏的形式还是请求体的形式也必须写清楚(记住必须要与对应的微服务URL保持一致，否则请求会出现问题)，使用@RequestParam或@RequestBody或@PathVariable的形式写清楚,这是其二。
四、编写Controller
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| package com.springcloud.blog.example;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping(value = "/test")
public class TestController {
@Autowired
FeignTestService feignTestService;
@GetMapping(value="/getIp")
public String getIp(String ip){
return feignTestService.getIpInfo(ip);
}
}
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五、测试
