OpenFeign设置header的3种方式

待我称王封你为后i 2023-09-27 12:24 117阅读 0赞

## 设置OpenFeign的FeignClient的Header信息 ##

在微服务间使用Feign进行远程调用时需要在 header 中添加信息，那么 SpringBoot和SpringCloud OpenFeign的@FeignClient如何设置 header 呢？有5种方式可以设置请求头信息:

• 在@RequestMapping注解里添加headers属性  
• 在方法参数前面添加@RequestHeader注解  
• 实现RequestInterceptor接口  
由于Feign是完全支持Spring MVC注解的, 所以推荐使用前两种Feign设置header的方式, 即: Spring MVC中使用注解设置header.

## 1、在@RequestMapping注解里添加headers属性 ##

在application.yml中配置

my.name=wtl
    @PostMapping(value = "/service/rest/v1/script/{scriptName}/run",headers = {"Authorization=Basic YWRtaW46QFdUTDE5OTIwMTE4MDI3MQ==","Content-Type=text/plain","AppSecret=${my.name}"})
        String runScript(@PathVariable("scriptName") String scriptName);

![4230b5ff36e0231e3e0bf9db9d1e83e1.png][]

## 2、在方法参数前面添加@RequestHeader注解 ##

设置单个header属性

@PostMapping(value = "/service/rest/v1/script/{scriptName}/run",headers = {"Content-Type=text/plain","AppSecret=${my.name}"})
    
        String runScript(@PathVariable("scriptName") String scriptName,@RequestHeader("Authorization") String authorization);

public String runScript(String scriptName) {
            return nexusOpenFeign.runScript(scriptName,"Basic YWRtaW46QFdUTDE5OTIwMTE4MDI3MQ==");
        }

![a5dc0f9ae1c1921a8a1ed2e4ddda6095.png][]

设置多个header属性

@PostMapping(value = "/service/rest/v1/script/{scriptName}/run")
        String runScript(@PathVariable("scriptName") String scriptName,@RequestHeader MultiValueMap<String, String> headers);

public String runScript(String scriptName) {
            MultiValueMap<String, String> headers = new HttpHeaders();
            headers.put("Authorization", Collections.singletonList("Basic YWRtaW46QFdUTDE5OTIwMTE4MDI3MQ=="));
            headers.add("Content-Type","text/plain");
            return nexusOpenFeign.runScript(scriptName,headers);
        }

![d2bbb086661973784926cdd52e2ec2fd.png][]

## 3、实现RequestInterceptor接口 ##

如果FeignRequestInterceptor注入到spring容器的话就会全局生效, 就是说即使在没有指定configuration属性的FeignClient该配置也会生效。  
配置@Component或@Service 或 @Configuration 就可以将该配置注入spring容器中, 即可实现全局配置, 从而该项目中的所有FeignClient的feign接口都可以使用该配置.  
如果只想给指定FeignClient的feign接口使用该配置, 请勿将该类配置注入spring中。

@Configuration
    public class FeignRequestInterceptor implements RequestInterceptor {
     
        @Override
        public void apply(RequestTemplate template) {
            template.header(HttpHeaders.AUTHORIZATION, "tokenVal");
        }
     
    }

@FeignClient(url = "${user.api.url}", name = "user", configuration = FeignRequestInterceptor.class)
    public interface UserFeignClient {
        @GetMapping(value = "/simple/{id}")
        public User findById(@RequestParam("id") String id);
    }

[4230b5ff36e0231e3e0bf9db9d1e83e1.png]: https://img-blog.csdnimg.cn/img_convert/4230b5ff36e0231e3e0bf9db9d1e83e1.png
[a5dc0f9ae1c1921a8a1ed2e4ddda6095.png]: https://img-blog.csdnimg.cn/img_convert/a5dc0f9ae1c1921a8a1ed2e4ddda6095.png
[d2bbb086661973784926cdd52e2ec2fd.png]: https://img-blog.csdnimg.cn/img_convert/d2bbb086661973784926cdd52e2ec2fd.png