feign 传参,feign调用文件上传接口

Feign调用服务Headers传参

在使用春云中经常会出现个服务调用，一般情况下会在头球加上代币的验证，那么在假装调用时候我们怎么去传这个代币过去呢，有人会用@标题这个注解来实现。但是这样方法太多笨重。

我们可以使用RequestInterceptor来实现

附上代码

　　导入佯请求拦截器导入佯。请求模板；导入org。spring框架。刻板印象。组件；导入组织。spring框架。网络。语境。请求。requestcontextholder导入组织。spring框架。网络。语境。请求。servletrequestattributes导入javax。servlet。http。http servlet请求；导入Java。util。枚举；@组件公共类SecuringRequestInterceptor实现请求拦截器{ @ Override public void apply(request template request template){ ServletRequestAttributes attributes=(ServletRequestAttributes)RequestContextHolder .getRequestAttributes()；http servlet请求请求=属性。get request()；枚举字符串头名称=请求。获取标头名称()；if (headerNames！=null){ while(标头名称。hasmorelements()){ String name=头名称。next element()；字符串值=请求。get header( Ttoken )；requestTemplate.header(Ttoken ，values)；} } } }

Feign设置Header头部，@Headers无效

在使用FeignClient调用外部接口的时候，需要在请求头部添加页眉的参数，用于请求的认证。在查找假装文档中提供了@标题注解，该注解可以完成头部的添加。但是却没有生效

　　@FeignClient(name=name ，url=127.0.0.1:8090/test ，path=/)公共接口IUserService { @ request mapping(value= getuser page ，method=RequestMethod .POST)@ Headers(value={ content type=application/x-www-form-urlencoded ， Inner _ token=pxh 0 DP 5 I 8 QQ 8 ubfppzm 67 cqkm 7j 8 twt 2 kwn 6j 6 sxykfp 2 kmo/lSqHQ== })public MapString，Object getUserPage(User用户用户)；}在服务端获取不到内部令牌的头部参数。得到的结果是空

于是开启feign的日志

第一步：定义假装的日志配置文件类

　　@配置公共类FeignConfig

　　{ @Bean Logger.Level feignLevel(){ return Logger.Level.FULL; }}第二步：在调用的FeignClien客户端注解上指定该日志级别配置文件

@FeignClient(name="name",url = "127.0.0.1:8090/test",path = "/",configuration = FeignConfig.class)public interface IUserService { @RequestMapping(value = "getUserPage",method = RequestMethod.POST) @Headers(value={"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="}) public Map<String,Object> getUserPage(User user);}

第三步：配置yml文件，指定该feignclient的配置路径和日志级别

logging: level: demo.IUserService: debug

重启，并发起请求

2019-09-27 10:46:01.662 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> POST http://127.0.0.1:8090/test/getUserPage HTTP/1.12019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Type: application/json;charset=UTF-82019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Length: 532019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]2019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"id":0,"tableName":"feignTable","page":10,"size":10}2019-09-27 10:46:01.663 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> END HTTP (53-byte body)2019-09-27 10:46:01.684 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- HTTP/1.1 200 (21ms)2019-09-27 10:46:01.684 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] content-type: application/json;charset=UTF-82019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] date: Fri, 27 Sep 2019 02:46:01 GMT2019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] transfer-encoding: chunked2019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] x-application-context: HelloServer:80902019-09-27 10:46:01.685 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]2019-09-27 10:46:01.689 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"success":true,"rows":[{"id":10111,"tableName":"hbaseTable","page":1,"size":20},{"id":10112,"tableName":"hbaseTable","page":1,"size":20},{"id":10113,"tableName":"hbaseTable","page":1,"size":20},{"id":10114,"tableName":"hbaseTable","page":1,"size":20},{"id":10115,"tableName":"hbaseTable","page":1,"size":20},{"id":10116,"tableName":"hbaseTable","page":1,"size":20},{"id":10117,"tableName":"hbaseTable","page":1,"size":20},{"id":10118,"tableName":"hbaseTable","page":1,"size":20},{"id":10119,"tableName":"hbaseTable","page":1,"size":20},{"id":10120,"tableName":"hbaseTable","page":1,"size":20}]}2019-09-27 10:46:01.689 DEBUG 15200 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- END HTTP (595-byte body)

　　

在日志中发现，header中没有被加上我之前设置的参数。说明该注解没有生效

于是debug调试

通过debug我发现feign会先将请求参数构建成Request对象，request信息如下：

　　从图中可看到，该Request实例的headers属性为空，而Request又是根据RequestTemplate模板对象生成的，RequestTemplate实例信息如下：

　　到这里可以看出，问题是出在RequestTemplate的构建构成中，于是我就去跟踪RequestTemplate构建的代码，发现RequestTemplate是根据MethodMetadata构建而成，而MethodMetadata就是对方法配置的抽象。

RequestTemplate template = resolve(argv, mutable, varBuilder); if (metadata.queryMapIndex() != null) { // add query map parameters after initial resolve so that they take // precedence over any predefined values template = addQueryMapQueryParameters(argv, template); } if (metadata.headerMapIndex() != null) { template = addHeaderMapHeaders(argv, template); }

从上述代码可以看到，header的设置是由metadata的headerMapIndex 属性决定的，那么，设置headerMapIndex的位置，必然就和Header的解析相关，于是通过查看方法引用，我找到了下面的代码：

private void parseHeaders(MethodMetadata md, Method method, RequestMapping annotation) { // TODO: only supports one header value per key if (annotation.headers() != null && annotation.headers().length > 0) { for (String header : annotation.headers()) { int index = header.indexOf(=); if (!header.contains("!=") && index >= 0) { md.template().header(resolve(header.substring(0, index)), resolve(header.substring(index + 1).trim())); } } } }

从代码中我们可以清晰的看到，解析过程中是从@RequestMapping或其派生注解的header属性中解析Header的，并且Header的key和value需要用=进行分割。

　　于是我修改成下面的形式，问题就解决了：

@FeignClient(name="name",url = "127.0.0.1:8090/test",path = "/",configuration = FeignConfig.class)public interface IUserService { @RequestMapping(value = "getUserPage",method = RequestMethod.POST,headers = {"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="}) @Headers(value={"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="}) public Map<String,Object> getUserPage(User user);}

查看请求日志

2019-09-27 11:10:29.975 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> POST http://127.0.0.1:8090/test/getUserPage HTTP/1.12019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ContentType: application/x-www-form-urlencoded2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Inner_token: PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ==2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Type: application/json;charset=UTF-82019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] Content-Length: 532019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"id":0,"tableName":"feignTable","page":10,"size":10}2019-09-27 11:10:29.976 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] ---> END HTTP (53-byte body)2019-09-27 11:10:29.992 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- HTTP/1.1 200 (16ms)2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] content-type: application/json;charset=UTF-82019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] date: Fri, 27 Sep 2019 03:10:29 GMT2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] transfer-encoding: chunked2019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] x-application-context: HelloServer:80902019-09-27 11:10:29.993 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage]2019-09-27 11:10:29.995 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] {"success":true,"rows":[{"id":10141,"tableName":"hbaseTable","page":1,"size":20},{"id":10142,"tableName":"hbaseTable","page":1,"size":20},{"id":10143,"tableName":"hbaseTable","page":1,"size":20},{"id":10144,"tableName":"hbaseTable","page":1,"size":20},{"id":10145,"tableName":"hbaseTable","page":1,"size":20},{"id":10146,"tableName":"hbaseTable","page":1,"size":20},{"id":10147,"tableName":"hbaseTable","page":1,"size":20},{"id":10148,"tableName":"hbaseTable","page":1,"size":20},{"id":10149,"tableName":"hbaseTable","page":1,"size":20},{"id":10150,"tableName":"hbaseTable","page":1,"size":20}]}2019-09-27 11:10:29.995 DEBUG 8604 --- [ hystrix-name-1] demo.IUserService : [IUserService#getUserPage] <--- END HTTP (595-byte body)

　　

请求中header已经被成功添加

　　以上为个人经验，希望能给大家一个参考，也希望大家多多支持盛行IT。

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