具有列表的JAX-RS @HeaderParam，仅填充一个逗号分隔的元素

问题描述

这是JAX-RS的特定问题.根据@HeaderParam文档:

This is a JAX-RS specific question. According to @HeaderParam docs:

https://docs.oracle.com /javaee/7/api/javax/ws/rs/HeaderParam.html

从文档中可以明显看出，如果标头有多个值，则可以将其映射到集合.这是我的示例:

It's clear from the docs that if there are multiple values for a header then it can be mapped to a collection.Here's my example:

@Path("/")
public class TestResource {

  @GET
  @Path("test")
  public String test(@HeaderParam("myHeader") List<String> list) {
    System.out.println(list.size());
    list.stream().forEach(System.out::println);
    return "response";
  }

}

客户:

Client client = ClientBuilder.newClient();
WebTarget target = client.target("http://localhost:8080/test");
String response = target.request()
                    .header("myHeader", "a")
                    .header("myHeader", "b")
                    .header("myHeader", "c,d")
                    .get(String.class);

client.close();

服务器控制台上的输出:

output on the server console:

1
a,b,c,d  

只有一个元素填充为"a，b，c，d"，而不是4个单独的元素.我在这里想念什么?搜索问题，但未找到任何答案.我正在使用Jersey 2.25.1.并在嵌入式tomcat中运行它:

Only one element is populated 'a,b,c,d' instead of 4 separate elements.What am I missing here? Googled the problem but didn't find any answers.I'm using Jersey 2.25.1. and running it in embedded tomcat:

<dependency>
    <groupId>org.glassfish.jersey.containers</groupId>
    <artifactId>jersey-container-servlet</artifactId>
    <version>2.25.1</version>
</dependency>

<!-- ............... -->

<plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
    <configuration>
    <path>/</path>
    </configuration>
</plugin>

谢谢

推荐答案

这不是您的应用程序的错误.它按设计工作.多个标头参数以逗号分隔.

This is not a bug of your application. It works as designed. Multiple header parameters are comma separated.

查看，它引用了HTTP协议rfc来使用多个标头属性.

Look at Standard for adding multiple values of a single HTTP Header to a request or response It references http protocol rfc for usage of multiple header attributes.

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