diff options
| author | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
|---|---|---|
| committer | Sven Eisenhauer <sven@sven-eisenhauer.net> | 2023-11-10 15:11:48 +0100 |
| commit | 33613a85afc4b1481367fbe92a17ee59c240250b (patch) | |
| tree | 670b842326116b376b505ec2263878912fca97e2 /Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java | |
| download | Studium-master.tar.gz Studium-master.tar.bz2 | |
Diffstat (limited to 'Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java')
| -rw-r--r-- | Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java | 101 |
1 files changed, 101 insertions, 0 deletions
diff --git a/Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java b/Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java new file mode 100644 index 0000000..03f1de9 --- /dev/null +++ b/Master/Reference Architectures and Patterns/hjp5/examples/RunCommand.java @@ -0,0 +1,101 @@ +/* RunCommand.java */
+
+import java.io.*;
+
+public class RunCommand
+{
+ static final int MODE_UNCONNECTED = 0;
+ static final int MODE_WAITFOR = 1;
+ static final int MODE_CATCHOUTPUT = 2;
+
+ private static void runCommand(String cmd, int mode)
+ throws IOException
+ {
+ Runtime rt = Runtime.getRuntime();
+ System.out.println("Running " + cmd);
+ Process pr = rt.exec(cmd);
+ if (mode == MODE_WAITFOR) {
+ System.out.println("waiting for termination");
+ try {
+ pr.waitFor();
+ } catch (InterruptedException e) {
+ }
+ } else if (mode == MODE_CATCHOUTPUT) {
+ System.out.println("catching output");
+ BufferedReader procout = new BufferedReader(
+ new InputStreamReader(pr.getInputStream())
+ );
+ String line;
+ while ((line = procout.readLine()) != null) {
+ System.out.println(" OUT> " + line);
+ }
+ }
+ try {
+ System.out.println(
+ "done, return value is " + pr.exitValue()
+ );
+ } catch (IllegalThreadStateException e) {
+ System.out.println(
+ "ok, process is running asynchronously"
+ );
+ }
+ }
+
+ private static void runShellCommand(String cmd, int mode)
+ throws IOException
+ {
+ String prefix = "";
+ String osName = System.getProperty("os.name");
+ osName = osName.toLowerCase();
+ if (osName.indexOf("windows") != -1) {
+ if (osName.indexOf("95") != -1) {
+ prefix = "command.com /c ";
+ } else if (osName.indexOf("98") != -1) {
+ prefix = "command.com /c ";
+ }
+ }
+ if (prefix.length() <= 0) {
+ System.out.println(
+ "unknown OS: don\'t know how to invoke shell"
+ );
+ } else {
+ runCommand(prefix + cmd, mode);
+ }
+ }
+
+ public static void main(String[] args)
+ {
+ try {
+ if (args.length <= 0) {
+ System.out.println(
+ "Usage: java RunCommand [-shell] " +
+ "[-waitfor|-catchoutput] <command>"
+ );
+ System.exit(1);
+ }
+ boolean shell = false;
+ int mode = MODE_UNCONNECTED;
+ String cmd = "";
+ for (int i = 0; i < args.length; ++i) {
+ if (args[i].startsWith("-")) {
+ if (args[i].equals("-shell")) {
+ shell = true;
+ } else if (args[i].equals("-waitfor")) {
+ mode = MODE_WAITFOR;
+ } else if (args[i].equals("-catchoutput")) {
+ mode = MODE_CATCHOUTPUT;
+ }
+ } else {
+ cmd = args[i];
+ }
+ }
+ if (shell) {
+ runShellCommand(cmd, mode);
+ } else {
+ runCommand(cmd, mode);
+ }
+ } catch (Exception e) {
+ System.err.println(e.toString());
+ }
+ }
+}
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