CPU Serial Number (or Processor Serial Number) is a software-readable unique serial number that Intel has stamped into its Pentium 3 microprocessor. Intel offers this as a feature that can be optionally used to provide certain network management and e-commerce benefits. Basically, it lets a program identify individual PCs.
We can get the CPU Serial number of a Windows machine in 2 ways:
- By running the command on Windows PowerShell.
- Using FileWriter class in java
Way 1: Running PowerShell command
It is a similar way to what we say running commands on terminals on Mac. For windows, it’s CMD for which we do have a one-liner pred-defined command below. You simply need to write it as it is or copy the same from here which is given below as follows:
Syntax:
WMIC BIOS GET SERIALNUMBER
This pop-up window will appear letting us revealing the CPU serial number for the windows machine.
Way 2: Using FileWriter class
Java FileWriter class of java.io package is used to write data in character form to file.
- This class inherits from OutputStreamWriter class which in turn inherits from the Writer class.
- The constructors of this class assume that the default character encoding and the default byte-buffer size are acceptable. To specify these values yourself, construct an OutputStreamWriter on a FileOutputStream.
- FileWriter is meant for writing streams of characters. For writing streams of raw bytes, consider using a FileOutputStream.
- FileWriter creates the output file if it is not present already.
Example
Java
// Java Program to get CPU Serial Number of Windows Machine// using FileWriter class// Importing required classesimport java.io.BufferedReader;import java.io.File;import java.io.FileWriter;import java.io.InputStreamReader;// Main class// WindowsCpuSerialNumberpublic class GFG { // Method 1 // To get CPU serial number private static String getWindowsCPU_SerialNumber() { // Initially declaring and initializing an empty // string String result = ""; // Try block to check for exceptions try { // Creating an object of File class File file = File.createTempFile("realhowto", ".vbs"); // Deleting file while exiting file.deleteOnExit(); // Creating an object of FileWriter class to // write on FileWriter fw = new java.io.FileWriter(file); // Remember the command String vbs1 = "Set objWMIService = GetObject(\"winmgmts:\\\\.\\root\\cimv2\")\n" + "Set colItems = objWMIService.ExecQuery _ \n" + " (\"Select * from Win32_Processor\") \n" + "For Each objItem in colItems \n" + " Wscript.Echo objItem.ProcessorId \n" + " exit for ' do the first cpu only! \n" + "Next \n"; // Writing on file fw.write(vbs1); // Closing all file connections to // release memory spaces fw.close(); Process p = Runtime.getRuntime().exec( "cscript //NoLogo " + file.getPath()); BufferedReader input = new BufferedReader( new InputStreamReader(p.getInputStream())); String line; while ((line = input.readLine()) != null) { result += line; } input.close(); } // Catch block to handle the exceptions catch (Exception E) { // Print the exception along with the message System.err.println("Windows CPU Exp : " + E.getMessage()); } return result.trim(); } // Method 2 // Main driver method public static void main(String[] args) { String cpuSerialNumber = getWindowsCPU_SerialNumber(); // Calling the method1 to retrieve CPU serial number // and printing the same System.out.println( "CPU Serial Number of my Windows Machine: " + cpuSerialNumber); }} |
Output:
Below is the hard-coded output when run on a Windows machine with the help of FileWriter class.
Note: In addition to this if these programs are windows specific and should not be run on other operating systems. Approach 1 will not work and for approach 2 that is the above approach been laid via FileWriter class if, on Mac the output is as follows. It is because ‘cscript’ cant be run on the terminal.
