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The java.lang.Runtime.exec (String [] cmdarray, String [] envp) method runs the specified command and arguments in a completely separate process with the specified environment. This is a practical method. Calling the form exec (cmdarray, envp) behaves exactly like calling envp, exec (cmdarray, null).
Explanation
public process exec (line [] cmdarray, line [] envp)
Parameters
cmdarray â ‘An array containing the command to invoke its arguments.
envp â € ‘An array of guitar strings, each element with settings that can be adapted to the environment, in the format name = value or null if the subprocess is to inherit the climate of the current process. ul>
Return Value
This method contains a new process object to control the user’s subprocess
Exception
SecurityException ‘If the security manager is available and its checkExec method does not allow exiting the subprocess’
Exception I / O on I / O error
NullPointerException ‘If the command should be null
IndexOutOfBoundsException ‘If cmdarray is empty wide area (length 0)
Example
This example requires a manual file named example.txt in our CLASSPATH with the actual content after â ’
Hello World!Com.tutorialspoint package;public class RuntimeDemo avoid the public static main (String [] args) an effort // create another array of 2 strings Line [] cmdArray = new line [2];// The first dialog is the program we want to open successfully cmdArray [0] = “notepad.exe”; // the second argument is the text file we want to open with Notepad cmdArray [1] matches “example.txt”; // display the message System.out.println (“Run Notepad.exe and open example.txt”); // get the process and run cmdArray and the current environment Process process = Runtime.getRuntime () .Exec (cmdArray, null); // display another message System.out.println (“example.txt should open now.”); capture (exception) for example printStackTrace ();
Let’s compile the above program and sprint, this will give your current output:
Run notepad.exe and enter example.txtexample.txt should open.
public boolean isOnline () Runtime.runtime = Runtime.getRuntime (); Try IpProcess means runtime.exec ("/ system / bin / ping -c 1 8.8.8.8"); Int exitValue corresponds to ipProcess.waitFor (); return (exitValue e. == 0); catch (IOException e) e.printStackTrace (); Catch (InterruptedException e) e.printStackTrace (); false return;
private boolean checkSudoPrivilege () throws InterruptedException, ioexception Process process = Runtime.getRuntime () .Exec ("sudo -v"); int exitCode = process.waitFor (); Return Value ExitCode == 0; }
private static string getNvidiaStats () throws java.io.IOException Line cmd = "nvidia-smi"; Stdin inputstream = Runtime.getRuntime () .Exec (cmd) .getInputStream (); InputStreamReader isr = new InputStreamReader (stdin); BufferedReader br = new BufferedReader (isr); Senate Bill StringBuilder = new StringBuilder (); String while s; ((s means br.! = readline ()) null) sb.append (s) .append (" n"); return sb.toString ();
private void generateHFile (FileDescriptor file) throws an exception The className string matches getFullyQualifiedClassName (file); Line command = "javah -classpath +" classpath + "-o + jniDir.path () +" / "+ + className". "H + className; Process development = Runtime.getRuntime (). Exec (command); process.waitFor (); obviously if (process.exitValue ()! = 0) System .out.println (); System.out. "Println (" command: + command); InputStream errorStream corresponds to process.getErrorStream (); intc is 0; while ((c means errorStream.read ())! = -1) System.out.print ((char) c);
private void generateHFile (FileDescriptor file) throws an exception String className = getFullyQualifiedClassName (file); The line command "javah = -classpath on + classpath +" -o "+ jniDir.path () +" / "+ + className". "D + className; Process process = Runtime.getRuntime () .Exec (command); process.waitFor (); if (process.exitValue ()! = 0) System .out.println (); System.out. "Println (" command: + command); InputStream errorStream = process.getErrorStream (); intc = 0; while ((c = errorStream.read ())! = -1) System.out.print ((char) c);
public inactive InputStream getBZip2PipedInputStream (String filename) throws an IOExceptio exceptionn Line bzcat = System.getProperty ("bzcat", runtime "bzcat"); rt corresponds to Runtime.getRuntime (); Line cmd = bzcat + inch "+ filename; P process is rt.exec (cmd); Writer errWriter New = BufferedWriter (new OutputStreamWriter (System.err)); StreamGobbler = errGobbler new StreamGobbler (p.getErrorStream (), errWriter); errGobbler.start (); keep returning p.getInputStream ();
private void startPython (String tmpPath, String args) throws an IOException The pythonBinaryPath string is config.getString (PythonOptions.PYTHON_BINARY_PATH); Try Runtime .getRuntime () .Exec (pythonBinaryPath); catch (IOException ignored) throw new RuntimeException (pythonBinaryPath + "does not point to the current Python binary."); Runtime.getRuntime () is involved in the process. + Exec (pythonbinarypath "-B" + tmpPath + FLINK_PYTHON_PLAN_NAME + args); new stream (new StreamPrinter (process.getInputStream ())). start (); new stream (new StreamPrinter (process.getErrorStream ())). start (); host = ServerSocket (0); new server.setSoTimeout (50); process.getOutputStream (). write ("plan n" .getBytes (ConfigConstants.DEFAULT_CHARSET)); process.getOutputStream () .flush ();
public static exec line (workingDirectory file line, ... commands) Try Process process = Runtime.getRuntime () .Exec (commands, null, workingDirectory); captureOutput (process) return.toString (); Clock (exception e) Get rid ofbombs (s);
public static nullify callShell (final String shellString, final InternalLogger log) process process = zero; Make sure String [] cmdArray means splitShellString (shellString); Process = Runtime.getRuntime (). Exec (cmdArray); process.waitFor (); log.info ("CallShell: <> OK", shellString); Travel (
Excellent autonomy. Every Java application has a specific instance of the Runtime class that allows the user application to interact with the environment in which it is running. The active runtime can be obtained from the custom getRuntime method.
The current runtime can be obtained from most of the getRuntime methods. Java Runtime Methods Your class: 1) Public static runtime getRuntime (): This method returns the instance or runtime model that is associated with the current Java application.
exec (String command) executes the specified string in a separate process. This is a practical method. Calling the application exec (command) behaves the same as calling exec (command, null, null).
