Apache HttpClient响应内容长度返回-1

Question

为什么以下代码返回-1？似乎请求失败.

public static void main(String[] args)
{
    DefaultHttpClient httpClient = new DefaultHttpClient();
    HttpGet httpGet = new HttpGet("http://www.google.de");

    HttpResponse response;
    try
    {
        response = httpClient.execute(httpGet);
        HttpEntity entity = response.getEntity();
        EntityUtils.consume(entity);

        // Prints -1
        System.out.println(entity.getContentLength());
    }
    catch (ClientProtocolException e)
    {
        e.printStackTrace();
    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
    finally
    {
        httpGet.releaseConnection();
    }
}

是否可以将响应作为String？

Answer 1

试试跑步

Header[] headers = response.getAllHeaders();
for (Header header : headers) {
    System.out.println(header);
}

它会打印出来

Date: Tue, 10 Sep 2013 19:10:04 GMT
Expires: -1
Cache-Control: private, max-age=0
Content-Type: text/html; charset=ISO-8859-1
Set-Cookie: PREF=ID=dad7e2356ddb3b7a:FF=0:TM=1378840204:LM=1378840204:S=vQcLzVPbOOTxfvL4; expires=Thu, 10-Sep-2015 19:10:04 GMT; path=/; domain=.google.de
Set-Cookie: NID=67=S11HcqAV454IGRGMRo-AJpxAPxClJeRs4DRkAJQ5vI3YBh4anN3qS0EVeiYX_4XDTGN-mY86xTBoJ3Ncca7eNSdtGjcaG31pbCOuqsZEQMWwKn-7-6Dnizx395snehdA; expires=Wed, 12-Mar-2014 19:10:04 GMT; path=/; domain=.google.de; HttpOnly
P3P: CP="This is not a P3P policy! See http://www.google.com/support/accounts/bin/answer.py?hl=en&answer=151657 for more info."
Server: gws
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Alternate-Protocol: 80:quic
Transfer-Encoding: chunked

这不是问题,您请求的页面根本不在Content-Length其响应中提供标题.就这样,HttpEntity#getContentLength()回报-1.

EntityUtils有很多方法,其中一些返回一个String.