Jersey / JAX-RS：在响应头而不是分块传输编码中返回Content-Length [英] Jersey/JAX-RS : Return Content-Length in response header instead of chunked transfer encoding

问题描述

我正在使用Jersey创建RESTful API资源，并使用 ResponseBuilder 来生成响应。

I'm using Jersey to create RESTful API resources, and ResponseBuilder to generate the response.

示例RESTful资源的代码：

Example code for the RESTful resource:

public class infoResource{
  @GET
  @Path("service/{id}")
  @Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
  public Response getCompany(@PathParam("id")String id) {
      //company is just a POJO.
      Company company = getCompany(id);
      return Response.status(200).entity(company).build();  
  }
}

在响应中，它返回了分块传输编码响应标头。 泽西世界中的正确方法是让它返回 Content-Length 标题，而不是 Transfer-Encoding：chunked 标题？

In the response, it's returning chunked transfer encoding in the response headers. What is the proper way in the "Jersey world" to have it return the Content-Length header instead of the Transfer-Encoding: chunked header in the response headers?

推荐答案

选择 Content-Length 或 Transfer-Encoding 只是那些容器选择。这实际上是缓冲区大小的问题。

Selecting Content-Length or Transfer-Encoding is just those Containers choice. It's really a matter of buffer size.

一种可能的解决方案是提供一个 SevletFilter ，它可以缓冲所有那些编组的字节和设置 Content-Length 标头值。

One possible solution is providing a SevletFilter which buffers all those marshalled bytes and sets Content-Length header value.

参见此页。

@WebFilter
public class BufferFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) {
    }

    @Override
    public void doFilter(ServletRequest request,
                         ServletResponse response,
                         FilterChain chain)
        throws IOException, ServletException {

        final ByteArrayOutputStream buffer =
            new ByteArrayOutputStream();

        // prepare a new ServletResponseWrapper
        // which returns the buffer as its getOutputStream();

        chain.doFilter(...)

        // now you know how exactly big is your response.

        final byte[] responseBytes = buffer.toByteArray();
        response.setContentLength(responseBytes.length);
        response.getOutputStream().write(responseBytes);
        response.flush();
    }

    @Override
    public void destroy() {
    }
}

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