获取Nist的美国官方标准时间的解决办法
今天在csdn上见网友在问如何获取Nist的美国官方标准时间,经摸索、查资料和自己实践后。
做出以下代码,已测试。思路其实还是很简单的:
1、发出对于指定网页的访问请求
2、获取返回的html文件,进行模式匹配定位和分割,即取得了对应的时间和日期
此方法,对于其他地方需从网页获取信息有可参考的。
命名空间需添加:
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
方法代码:
//获取美国官方时间和日期
private void GetNistTimeUS( out string time, out string Data )
{
try
{
//nist.time.gov的url
string strNistUrl = "http://nist.time.gov/timezone.cgi?UTC/s/0";
![](/Images/OutliningIndicators/InBlock.gif)
//构造并实例化一个WebRequest
System.Net.WebRequest myHttpWebRequest = System.Net.HttpWebRequest.Create( strNistUrl );
//设置连接超时时间
myHttpWebRequest.Timeout = 8000;
//设置WebResponse,接收返回信息
System.Net.WebResponse myHttpWebResponse = myHttpWebRequest.GetResponse();
//获取返回信息流信息
Stream sr = myHttpWebResponse.GetResponseStream();
//设置流阅读器
StreamReader reader = new StreamReader(sr, System.Text.Encoding.ASCII);
//流输出为字符串
String srdata = reader.ReadToEnd();
//将返回html文本中的双引号变为单引号
srdata = srdata.Replace( "\"","\'");
//用模式匹配加分割的方式定位和获取时间信息
string strOut = Regex.Split( srdata, "color='white'><b>" , RegexOptions.IgnoreCase)[1];
string strTime = Regex.Split( strOut , "<br>", RegexOptions.IgnoreCase )[0];
time = DateTime.Parse( strTime ).ToLongTimeString();
//用模式匹配加分割的方式定位和获取日期信息
string strOut1 = Regex.Split( srdata, "'5' color='white'>" , RegexOptions.IgnoreCase)[1];
string strData = Regex.Split( strOut1 , "<br>", RegexOptions.IgnoreCase )[0];
Data = DateTime.Parse( strData ).ToShortDateString();
}
catch( System.Exception ex )
{
time = string.Empty;
Data = string.Empty;
MessageBox.Show( "获取时间出错:" + ex.Message );
}
}
//获取中国标准时间(由美国官方时间折算)
private void GetNistTimeCN( out string time, out string Data )
{
try
{
//nist.time.gov的url
string strNistUrl = "http://nist.time.gov/timezone.cgi?UTC/s/0";
![](/Images/OutliningIndicators/InBlock.gif)
//构造并实例化一个WebRequest
System.Net.WebRequest myHttpWebRequest = System.Net.HttpWebRequest.Create( strNistUrl );
//设置连接超时时间
myHttpWebRequest.Timeout = 8000;
//设置WebResponse,接收返回信息
System.Net.WebResponse myHttpWebResponse = myHttpWebRequest.GetResponse();
//获取返回信息流信息
Stream sr = myHttpWebResponse.GetResponseStream();
//设置流阅读器
StreamReader reader = new StreamReader(sr, System.Text.Encoding.ASCII);
//流输出为字符串
String srdata = reader.ReadToEnd();
//将返回html文本中的双引号变为单引号
srdata = srdata.Replace( "\"","\'");
//用模式匹配加分割的方式定位和获取时间信息
string strOut = Regex.Split( srdata, "color='white'><b>" , RegexOptions.IgnoreCase)[1];
string strTime = Regex.Split( strOut , "<br>", RegexOptions.IgnoreCase )[0];
//小时需调整,因时区相差8小时
time = DateTime.Parse( strTime ).AddHours( 8 ).ToLongTimeString();
![](/Images/OutliningIndicators/InBlock.gif)
//用模式匹配加分割的方式定位和获取日期信息
string strOut1 = Regex.Split( srdata, "'5' color='white'>" , RegexOptions.IgnoreCase)[1];
string strData = Regex.Split( strOut1 , "<br>", RegexOptions.IgnoreCase )[0];
//获取中国时间-小时部分
int intHourCn = int.Parse( time.Split( ':' )[0] );
//获取美国时间-小时部分
int intHourUS = int.Parse( DateTime.Parse( strTime ).ToLongTimeString().Split( ':' )[0] );
//比较小时差异,调整日期差异
if ( intHourCn < intHourUS )
{
Data = DateTime.Parse( strData ).AddDays(1).ToShortDateString();
}
else
{
Data = DateTime.Parse( strData ).ToShortDateString();
}
}
catch( System.Exception ex )
{
time = string.Empty;
Data = string.Empty;
MessageBox.Show( "获取时间出错:" + ex.Message );
}
}
调用代码:
//获取美国时间按钮
private void btnGetTime_Click(object sender, System.EventArgs e)
{
try
{
string strTime = string.Empty;
string strDate = string.Empty;
![](/Images/OutliningIndicators/InBlock.gif)
GetNistTimeUS( out strTime, out strDate );
txtTime.Text = strTime;
txtData.Text = strDate;
}
catch( System.Exception ex )
{
MessageBox.Show( ex.Message );
}
}
![](/Images/OutliningIndicators/None.gif)
//获取中国时间按钮
private void btnGetTimeCN_Click(object sender, System.EventArgs e)
{
try
{
string strTime = string.Empty;
string strDate = string.Empty;
![](/Images/OutliningIndicators/InBlock.gif)
GetNistTimeCN( out strTime, out strDate );
txtTime.Text = strTime;
txtData.Text = strDate;
}
catch( System.Exception ex )
{
MessageBox.Show( ex.Message );
}
}
做出以下代码,已测试。思路其实还是很简单的:
1、发出对于指定网页的访问请求
2、获取返回的html文件,进行模式匹配定位和分割,即取得了对应的时间和日期
此方法,对于其他地方需从网页获取信息有可参考的。
命名空间需添加:
using System.Net;
using System.IO;
using System.Text.RegularExpressions;
方法代码:
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