Write the logon ip address to the txt file and the logon ip address to the txt file.

Write the logon ip address to the txt file and the logon ip address to the txt file.
Protected void Page_Load (object sender, EventArgs e)
{

String ip = System. Web. HttpContext. Current. Request. UserHostAddress;
WriteIpToTxt (ip );
}
Public void WriteIpToTxt (string ip)
{
String strfile;
Strfile = "asp.txt ";

String strout;
Strout = "";
StreamReader sr = new StreamReader (System. Web. HttpContext. Current. Server. MapPath (strfile), System. Text. Encoding. Default );

String input = sr. ReadToEnd ();
Sr. Close ();
StreamWriter sw = new StreamWriter (Server. MapPath (strfile), false, System. Text. Encoding. Default );
Sw. Write (input + "IP :");
Sw. Write (ip + "\ r \ n ");
Sw. Close ();
Strout = input;

}
How to Write a txt file in java

Import java. io .*;
Import java. util .*;

Public class LogTest {

Public static void main (String [] args)
{
File log = new File ("user \ log \ login. log ");
String newLog = "UserName: Jim Green | Date:" + new Date () + "| IP: 202.65.21.14 ";
AppendLog (log, newLog );
}

Public static void appendLog (File log, String newLog)
{
Optional SC = null;
PrintWriter pw = null;
Try {
If (! Log. exists () // if the file does not exist, create a new one.
{
File parentDir = new File (log. getParent ());
If (! ParentDir. exists () // If the directory does not exist, create a new one.
ParentDir. mkdirs ();
Log. createNewFile ();
}
SC = new round (log );
StringBuilder sb = new StringBuilder ();
While (SC. hasNextLine () // read the content of the old file and save it to sb;
{
Sb. append (SC. nextLine ());
Sb. append ("\ r \ n"); // The linefeed is used as the interval. The scanner cannot read it, so you must add it yourself.
}
SC. close ();

Pw = new PrintWriter (new FileWriter (log), true );
/* A. */pw. println (sb. toString (); //, write the content of the old file.
/* B. */pw. println (newLog); // write new logs.
/*
* If A is written first, the latest log is at the end of the file.
* If data is written to B first, the latest log is at the beginning of the file.
*/
Pw. close ();
}
Catch (IOException ex)
{
Ex. printStackTrace ();
}
}
}

What should I do if I want to write the Ping result to the txt file?

Ping *. *> d: \ ping.txt
Save the ping *. * ip to the d: \ ping.txt file.

Example: ping www.baidu.com> d: \ ping.txt

Open d: \ ping.txt

Pinging www.a.shifen.com [202.108.22.43] with 32 bytes of data:

Reply from 202.108.22.43: bytes = 32 time = 21 ms TTL = 50

Reply from 202.108.22.43: bytes = 32 time = 21 ms TTL = 50

Reply from 202.108.22.43: bytes = 32 time = 21 ms TTL = 50

Reply from 202.108.22.43: bytes = 32 time = 21 ms TTL = 50

Ping statistics for 202.108.22.43:

Packets: Sent = 4, stored ED = 4, Lost = 0 (0% loss ),

Approximate round trip times in milli-seconds:

Minimum = 21 ms, Maximum = 21 ms, Average = 21 ms