如何使用HTTPClient的HEAD方法获取所有标头 [英] how to use HEAD method of HTTPClient to get all headers

问题描述

我必须使用HttpClient的HEAD方法来获取标头字段并检查服务器文件的最后修改"日期.
我无法获取，如果您知道如何获取标题字段，请回复. 如何将最后修改的"标头放入String对象以进行比较.

I have to use HEAD method of HttpClient to get the header field and to check the "last-modified" date of server file.
I am not able to get that, if you know how to get the header field then please reply. How to get the "last-modified" header into the String object for the comparison.

这是我的代码:

HttpClient client = new DefaultHttpClient();
//HttpGet get = new HttpGet(url);
HttpHead method = new HttpHead(url);
HttpResponse response= client.execute(method);

Header[] s = response.getAllHeaders();

System.out.println("THe header from the httpclient:");
for(int i=0; i < s.length; i++){
    Header hd = s[i];
    System.out.println("Header Name: "+hd.getName()
                        +"       "+" Header Value: "+ hd.getValue());
}

推荐答案

在httpClient 4.5上，您将使用:

On httpClient 4.5 you would use:

final HttpHead headMethod = new HttpHead(fileUri);
final Header header = headMethod.getFirstHeader("last-modified");
final String lastModified = header.getValue();

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