怎样在小程序里实现标题的更改
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2022-10-24
关于Feign调用服务Headers传参问题
目录Feign调用服务Headers传参我们可以使用RequestInterceptor来实现Feign设置Header头部,@Headers无效于是开启feign的日志于是debug调试
Feign调用服务Headers传参
在使用springcloud中经常会出现个服务调用,一般情况下会在Headers加上token的验证,那么在feign调用时候我们怎么去传这个token过去呢,有人会用@Headers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
import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
@Component
public class SecuringRequestInterceptor implements RequestInterceptor {
@Override
public void apply(RequestTemplate requestTemplate) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder
.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
Enumeration
if (headerNames != null) {
while (headerNames.hasMoreElements()) {
String name = headerNames.nextElement();
String values = request.getHeader("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header的参数,用于请求的认证。在查找Feign文档中提供了@Headers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 = "/")
public interface IUserService {
@RequestMapping(value = "getUserPage",method = RequestMethod.POST)
@Headers(value={"ContentType=application/x-www-form-urlencoded","Inner_token=PXH0dP5I8qQ8UbFPpzm67cQkm7j8tWT2Kwn6J6SXYkfp2kMo/lSqHQ=="})
public Map
}
在服务端获取不到Inner_token的头部参数。得到的结果是null
于是开启feign的日志
第一步:定义feign的日志配置文件类
@Configuration
public class 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
}
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"RVIFdOP:10114,"tableName":"hbaseTable","page":1,"size":20},{"id":10115,&quhttp://ot;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
}
查看请求日志
2019-09-27 11:10:29http://.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
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