【发布时间】：2012-01-09 22:15:42
【问题描述】：
我正在尝试使用收到的 cookie 来响应我使用 HttpClient 4.0.3 的 post 方法；
这是我的代码：
public void generateRequest()
{
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost("http://mysite.com/login");
httpclient.getParams().setParameter("http.useragent", "Custom Browser");
httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION,
HttpVersion.HTTP_1_1);
httpclient.getParams().setParameter(ClientPNames.COOKIE_POLICY,
CookiePolicy.BROWSER_COMPATIBILITY);
CookieStore cookieStore = new BasicCookieStore();
HttpContext localContext = new BasicHttpContext();
localContext.setAttribute(ClientContext.COOKIE_STORE, cookieStore);
try
{
LOG.info("Status Code: sending");
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair("email", "john%40gmail.com"));
nameValuePairs.add(new BasicNameValuePair("password", "mypassword"));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
httppost.setHeader("ContentType", "application/x-www-form-urlencoded");
HttpResponse response = httpclient.execute(httppost, localContext);
HttpEntity entity = response.getEntity();
if (entity != null)
{
entity.consumeContent();
}
iterateCookies(httpclient);
}
catch (ClientProtocolException e)
{
LOG.error("ClientProtocolException", e);
}
catch (IOException e)
{
LOG.error("IOException", e);
}
}
private void iterateCookies(DefaultHttpClient httpclient)
{
List<Cookie> cookies = httpclient.getCookieStore().getCookies();
if (cookies.isEmpty())
{
System.out.println("No cookies");
}
else
{
for (Cookie c : cookies)
{
System.out.println("-" + c.toString());
}
}
}
但是，即使在使用 web-sniffer.net 时，我仍然收到 No cookies 注销，但收到以下响应：
Status: HTTP/1.1 302 Found
Cache-Control: private, no-store
Content-Type: text/html; charset=utf-8
Location: http://www.mysite.com/loginok.html
Server: Microsoft-IIS/7.0
X-AspNet-Version: 2.0.50727
Set-Cookie: USER=DDA5FF4E1C30661EC61CFA; domain=.mysite.com; expires=Tue, 08-Jan-2013 18:39:53 GMT; path=/
Set-Cookie: LOGIN=D6CC13A23DCF56AF81CFAF; domain=.mysite.com; path=/ Date: Mon, 09 Jan 2012 18:39:53 GMT
Connection: close
Content-Length: 165
我在网上找到的所有有意义的示例均参考 HttpClient 3.x，您可以在其中将 CookiePolicy 设置为 IGNORE 并手动处理 Set-Cookie 标头。我不明白为什么这在4.x 中如此困难。出于多种原因，我需要访问USER 哈希。谁能告诉我怎么才能访问它？
更新
我发现下面的C# 代码做同样的事情并且工作正常。
private static string TryGetCookie(string user, string pass, string baseurl)
{
string body = string.Format("email={0}&password={1}", user, pass);
byte[] bodyData = StringUtils.StringToASCIIBytes(body);
HttpWebRequest req = WebRequest.Create(baseurl) as HttpWebRequest;
if (null != req.Proxy)
{
req.Proxy.Credentials = CredentialCache.DefaultCredentials;
}
req.AllowAutoRedirect = false;
req.Method = "Post";
req.ContentType = "application/x-www-form-urlencoded";
req.ContentLength = bodyData.Length;
using (Stream reqBody = req.GetRequestStream())
{
reqBody.Write(bodyData, 0, bodyData.Length);
reqBody.Close();
}
HttpWebResponse resp1 = req.GetResponse() as HttpWebResponse;
string cookie = resp1.Headers["Set-Cookie"];
if( string.IsNullOrEmpty(cookie))
{
if (0 < resp1.ContentLength)
{
// it's probably not an event day, and the server is returning a singlecharacter
StreamReader stringReader = new StreamReader(resp1.GetResponseStream());
return stringReader.ReadToEnd();
}
return null;
}
return ParseCookie(cookie);
}
我相信我的 java 代码没有正确形成 post 请求，因为当我使用 URLConnection 并从下面的 web-sniffer.net 打印请求标头时：
POST /reg/login HTTP/1.1[CRLF]
Host: live-timing.formula1.com[CRLF]
Connection: close[CRLF]
User-Agent: Web-sniffer/1.0.37 (+http://web-sniffer.net/)[CRLF]
Accept-Charset: ISO-8859-1,UTF-8;q=0.7,*;q=0.7[CRLF]
Cache-Control: no-cache[CRLF]
Accept-Language: de,en;q=0.7,en-us;q=0.3[CRLF]
Referer: http://web-sniffer.net/[CRLF]
Content-type: application/x-www-form-urlencoded[CRLF]
Content-length: 53[CRLF]
[CRLF]
email=john%40gmail.com&password=mypassword
我收到来自服务器的响应，其中包含 set-cookies 标头。我的 java 代码生成的请求和 web-sniffer.net 一样吗？
我见过使用这段代码生成的 post 方法：
PostMethod authPost = new PostMethod("http://localhost:8000/webTest/j_security_check");
// authPost.setFollowRedirects(false);
NameValuePair[] data = {
new NameValuePair("email", "john%40gmail.com"),
new NameValuePair("password", "mypassword")
};
authPost.setRequestBody(data);
status = client.executeMethod(authPost);
这里的主要区别是NameValuePair 数据设置在请求正文中，而不是设置为实体。这有什么不同吗？这会产生正确的请求标头吗？
【问题讨论】：
标签： java http cookies httpclient