泽西岛客户：添加Cookie进行请求

Question

我正在尝试编写一个使用Jersey客户端API访问RESTful
Web服务的库。该服务需要设置cookie的登录请求，然后后续请求必须将该cookie设置为成功。登录请求按预期方式工作，我能够从登录响应中检索cookie，但似乎无法在后续请求中重新添加cookie。谁能说出我可能做错了什么。这是发出请求的代码：

MultivaluedMap<String,String> qs = new MultivaluedMapImpl();
qs.add( "xml", this.toXmlString() );

WebResource wr = client.resource( Constants.ServiceURL );    
if ( CookieJar.Cookies != null )
{
  for ( NewCookie c : CookieJar.Cookies )
  {
    logger.debug( "Setting cookie " + c.getName() );
    wr.cookie( c );
  }
}

ClientResponse response = wr.queryParams( qs ).get( ClientResponse.class );

当请求没有失败时，服务将以应用程序错误“ No Session”进行响应。这是请求序列的日志跟踪：

Jul 15, 2011 5:20:33 PM com.sun.jersey.api.client.filter.LoggingFilter log
INFO: 1 * Client out-bound request
1 > GET https://www.company.com/TrackerXMLInterface.asp?xml=%3Cxml%3E%3CTRANTYPE%3ELOGIN%3C/TRANTYPE%3E%3CTRANPARMS%3E%3CLOGINID%3Emylogin%3C/LOGINID%3E%3CPASSPHRASE%3EBa1b2c3%3C/PASSPHRASE%3E%3C/TRANPARMS%3E%3C/xml%3E

Jul 15, 2011 5:20:35 PM com.sun.jersey.api.client.filter.LoggingFilter log
INFO: 1 * Client in-bound response
1 < 200
1 < Date: Fri, 15 Jul 2011 22:20:35 GMT
1 < Content-Length: 150
1 < Set-Cookie: ASPSESSIONIDSUBSBSRR=GBGOKGJDAAHCNDDHPBFICFIH; secure; path=/
1 < Content-Type: text/html
1 < Server: Microsoft-IIS/7.0
1 < X-Powered-By: ASP.NET
1 < Cache-Control: private
1 < 
<XML><TRANRESULTS><TRANRETURNCODE>L00</TRANRETURNCODE><TRANRETURNMSG>Valid Login         </TRANRETURNMSG><TRANDETAIL></TRANDETAIL></TRANRESULTS></XML>
[continued below]

我在想以下请求应该在标题中包含cookie：

Jul 15, 2011 5:20:35 PM com.sun.jersey.api.client.filter.LoggingFilter log
INFO: 1 * Client out-bound request
1 > GET https://www.company.com/TrackerXMLInterface.asp?xml=%3Cxml%3E%3CTRANTYPE%3ESSNLAST%3C/TRANTYPE%3E%3CTRANPARMS%3E%3CSSN%3E123456789%3C/SSN%3E%3CLASTNAME%3ESchmoe%3C/LASTNAME%3E%3C/TRANPARMS%3E%3C/xml%3E

Jul 15, 2011 5:20:35 PM com.sun.jersey.api.client.filter.LoggingFilter log
INFO: 1 * Client in-bound response
1 < 200
1 < Date: Fri, 15 Jul 2011 22:20:35 GMT
1 < Content-Length: 150
1 < Set-Cookie: ASPSESSIONIDSUBSBSRR=HBGOKGJDIAPBBEIGLOILDJDN; secure; path=/
1 < Content-Type: text/html
1 < Server: Microsoft-IIS/7.0
1 < X-Powered-By: ASP.NET
1 < Cache-Control: private
1 < 
<XML><TRANRESULTS><TRANRETURNCODE>R04</TRANRETURNCODE><TRANRETURNMSG>No Session          </TRANRETURNMSG><TRANDETAIL></TRANDETAIL></TRANRESULTS></XML>

非常感谢对此的任何指导。

Answer 1

问题是WebResource是不可变的-
cookie（）方法返回WebResource.Builder。因此，每次调用Cookie时，执行以下操作只会创建一个WebResource.Builder的新实例（并且完全不会修改原始的WebResource）。您将忽略那些Builder实例，并仍然在原始WebResource上执行请求：

for ( NewCookie c : CookieJar.Cookies ) {
    logger.debug( "Setting cookie " + c.getName() );
    wr.cookie( c );
}

您应该改为执行以下操作：

WebResource.Builder builder = wr.getRequestBuilder();
for (NewCookie c : CookieJar.Cookies) {
    builder = builder.cookie(c);
}

然后，您可以通过以下方式提出请求：

ClientResponse response = builder.queryParams(qs).get(ClientResponse.class);

另外，为避免在所有资源方法中重复此代码，您可能需要考虑编写一个客户端过滤器，该过滤器将针对您的所有请求执行此操作。例如，以下代码将确保为每个响应设置从服务器发送的cookie：

client.addFilter(new ClientFilter() {
    private ArrayList<Object> cookies;

    @Override
    public ClientResponse handle(ClientRequest request) throws ClientHandlerException {
        if (cookies != null) {
            request.getHeaders().put("Cookie", cookies);
        }
        ClientResponse response = getNext().handle(request);
        if (response.getCookies() != null) {
            if (cookies == null) {
                cookies = new ArrayList<Object>();
            }
            // simple addAll just for illustration (should probably check for duplicates and expired cookies)
            cookies.addAll(response.getCookies());
        }
        return response;
    }
});

注意：仅当您不共享具有多个线程的客户端实例时，这才有效！