如何在Jersey 1.x的服务器端为传入请求设置Accept标头 [英] How to set Accept header on the server side in Jersey 1.x for an incoming request

问题描述

我想知道是否可以在服务器端为传入请求设置"Accept"标头.

I would like to know if there is a way to set the "Accept" headers for an incoming request on server side.

在Jersey 2.x中可以通过实现和注册@prematching ContainerRequestFilter来做到这一点，但是我还没有找到在Jersey 1.x版本中实现相同功能的方法.

This is possible to do in Jersey 2.x by implementing and registering a @prematching ContainerRequestFilter but I have not found a way to achieve the same in Jersey 1.x versions.

这个想法是在资源方法上设置一个"Accept"标头，该标头可以通过"@Produces"注释来理解.我正在尝试处理客户端无法设置"Accept"标头的用例.因此，他将期望的响应类型指定为查询参数，例如"type = json".想法是最好在过滤器中读取提供的类型查询参数，并在调用带有"@Produces"注释的资源方法之前更新"Accept"标头.

The idea is to set an "Accept" header that is understood by '@Produces' annotation on a resource method. I am trying to handle a use case where the client cannot set an "Accept" header. So he specifies the kind of response he expects as a query parameter such as "type=json". The idea is to read the supplied type query parameter preferably in a filter and update the "Accept" header before the resource method with the '@Produces' annotation is called.

请让我知道是否有办法实现这一目标.

Please let me know if there is a way to achieve this.

最诚挚的问候，

推荐答案

我认为实现此目的的首选方法是使用网址扩展名.

I think the preferred way to do this is with url extensions.

http://example.org/resource.xml

将返回XML.

http://example.org/resource.json

将返回JSON.

这可以通过自定义PackagesResourceConfig告诉Jersey如何将扩展名映射到媒体类型来实现:

This can be implemented with a custom PackagesResourceConfig telling Jersey how to map extensions to media types:

public class ExampleResourceConfig extends PackagesResourceConfig {

  public ExampleResourceConfig(Map<String, Object> props) {
    super(props);
  }

  public ExampleResourceConfig(String... packages) {
    super(packages);
  }

  @Override
  public Map<String, MediaType> getMediaTypeMappings() {
    Map<String, MediaType> map = newHashMap();
    map.put("xml", MediaType.APPLICATION_XML_TYPE);
    map.put("json", MediaType.APPLICATION_JSON_TYPE);
    return map;
  }

}

如果您使用web.xml来配置Jersey，则可以将javax.ws.rs.Application属性设置为您的PackagesResourceConfig类名称.

If you're using a web.xml to configure Jersey you can set the javax.ws.rs.Application property to your PackagesResourceConfig class name.

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