HttpClient 从响应实体中获取字符集

static String getEntityContentEncoding(HttpEntity entity)
	{
		Header header = entity.getContentType();
		HeaderElement[] hes = header.getElements();
		for(HeaderElement he : hes)
		{
			for(NameValuePair p : he.getParameters())
			{
				if("charset".equals(p.getName()))
				{
					return p.getValue();
				}
			}
		}
		return null;
	}