I am trying to run an external process in Java and I have no idea why my code isn't working. It works for any other 'cmd' command (for example /c dir). If I replace cmd sc sdshow w32time with cmd /c dir it works.
Here is my code:
public class services2 {
public static void main(String args[]) {
try {
Process p = Runtime.getRuntime().exec("cmd sc sdshow w32time");
p.waitFor();
BufferedReader reader = new BufferedReader(new InputStreamReader(
p.getInputStream()));
String line = reader.readLine();
while (line != null) {
System.out.println(line);
line = reader.readLine();
}
} catch (IOException e1) {
} catch (InterruptedException e2) {
}
System.out.println("Done");
}
}
Any ideas?
Your problem seems to be that sc is not an argument for cmd.
What you need is:
sc sdshow w32time
Related
A very simple code running in the debugging mode perfectly but not working after installation of exe, giving no response/result in return. even no errors to trace.
After building a .exe and installing on my PC its happening, very strange.
tried process builder but the same thing, anyway to check/trace it. maybe paths ?
StringBuilder b = new StringBuilder();
Process p = Runtime.getRuntime().exec("wmic diskdrive get signature");
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
b.append(line);
}
Please note: CMD /c before commands also return an empty response in actual env.
An internal windows command with arguments, like "wmic diskdrive ..."
can be executed easily by wrapping it up inside a cmd window.
Here is the working code snippet for running the wmic command encapsulated in a cmd window:
import java.io.*;
public class Wmic {
public static void main(String[] args) {
StringBuilder b = new StringBuilder();
try {
// Initialize a process object to run
// wmic command and its parameters
// inside a cmd window
Process process = Runtime.getRuntime()
.exec("cmd /c C:\\Windows\\System32\\wbem\\WMIC.exe diskdrive get signature");
BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
b.append(line);
}
} catch (Exception ex) {
b.append(ex.toString());
}
System.out.println("Output: \n" + b.toString());
}
}
Output:
>javac Wmic.java
>java Wmic
Output:
Signature
More information:
https://mkyong.com/java/how-to-execute-shell-command-from-java/
The ProcessBuilder constructor takes a list of strings. When using ProcessBuilder to run a command, I separate all the words in the command into separate strings.
I read the output of the process in a separate thread. And I always wait for the command, that I launched via ProcessBuilder, to terminate.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringWriter;
public class PrcBldTs {
public static void main(String[] args) {
ProcessBuilder pb = new ProcessBuilder("wmic","diskdrive","get","signature");
try {
Process proc = pb.start();
StreamGobbler error = new StreamGobbler(proc.getErrorStream());
StreamGobbler output = new StreamGobbler(proc.getInputStream());
Thread stdout = new Thread(output);
Thread stderr = new Thread(error);
stdout.start();
stderr.start();
int result = proc.waitFor();
stdout.join();
stderr.join();
System.out.println("Exit status = " + result);
if (result != 0) {
System.out.println(error.getContents());
}
else {
System.out.println(output.getContents());
}
}
catch (IOException | InterruptedException x) {
x.printStackTrace();
}
}
}
class StreamGobbler implements Runnable {
private BufferedReader reader;
private StringWriter sw;
public StreamGobbler(InputStream is) {
InputStreamReader isr = new InputStreamReader(is);
reader = new BufferedReader(isr);
sw = new StringWriter();
}
public String getContents() {
return sw.toString();
}
public void run() {
try {
String line = reader.readLine();
while (line != null) {
sw.append(line);
sw.append(System.lineSeparator());
line = reader.readLine();
}
}
catch (IOException xIo) {
throw new RuntimeException(xIo);
}
}
}
Running the above code gave me the following output.
Exit status = 0
Signature
1145609371
import java.io.*;
public class ColorTest {
public static void main(String [] args){
try{
//Process p = Runtime.getRuntime().exec("cmd /c color 0a");
BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while ((line = in.readline()) != null) {
System.out.println(line);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
I am not understanding why the command won't execute. The line that is commented is the one I need help with.
I want to execute android shell command from my android app to execute a uiautomator test jar.
i have tried following options. but neither of them is working for me...
public void execute(String shellcommand) {
Runtime rt = Runtime.getRuntime();
Process p = r.exec(new String[]{"/system/bin/sh", "-c", shellcommand});
}
Also tried...
public void execute(String shellcommand) {
Process su = Runtime.getRuntime().exec("su");
DataOutputStream outputStream = new DataOutputStream(su.getOutputStream());
outputStream.writeBytes(shellcommand + "\n");
outputStream.flush();
outputStream.writeBytes("exit\n");
outputStream.flush();
su.waitFor();
}
Please tell what mistake i m doing?
Android 5.0 solved your problem. Here is new API using which you can execute shell commands.Check here : executeShellCommand (String command)
Enjoy!!!
Try this, i added an output reading process also. But you'll need to cut up your shell command:
ProcessBuilder pb = new ProcessBuilder("adb", "shell", "uiautomator", "runtest", "/data/local/tmp/MyJar.jar", "-c", "com.my.test.Class#testmethod", "-e someparameter someparameterName");
Process pc;
try {
pc = pb.start();
InputStream stdin = pc.getInputStream();
InputStreamReader isr = new InputStreamReader(stdin);
BufferedReader br = new BufferedReader(isr);
String line;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
InputStreamReader esr = new InputStreamReader(pc.getErrorStream());
BufferedReader errorReader = new BufferedReader(esr);
pc.waitFor();
} catch (IOException e) {
e.printStackTrace();
Assert.fail(e.getMessage());
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Assert.fail(e.getMessage());
}
i want to read anything written in the terminal the Java class read it and store it in variable to use it in another method
can any one help me?
public class Termainl {
public static void main (String args[] ) throws IOException{
String[] cmdArray = {"gnome-terminal","java -classpath /home/r/byz/ Orchestrator"};
try {
Runtime.getRuntime().exec(cmdArray);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
I don't think you can easily get the output of the console like this but you can get the output of the process you launch. Why not directly launch the process and get its output.
You could try something like this:
try {
Runtime.getRuntime().exec( "java -classpath /home/r/byz/ Orchestrator" );
String line;
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
//<-- Parse data here.
}
input.close();
} catch (Exception err) {
//......
}
I'm running a Java program from another Java application using Runtime.getRuntime().exec like this
Process p1 = Runtime.getRuntime().exec("javac test.java");
Process p2 = Runtime.getRuntime().exec("java test");
The content of the test.java
import java.io.*;
class test
{
public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
String s = sc.nextLine();
System.out.println(s);
}
}
I want to handle Input, Output and Error stream of the process p2.
I did capture of the output of the test.java, however, I do not know how to handle output and error.
Here is my code:
try {
String s = "";
InputStream istr = p2.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(istr));
BufferedReader bre = new BufferedReader
(new InputStreamReader(p2.getErrorStream()));
while ((s = br.readLine()) != null) {
System.out.println(s);
}
br.close();
while ((s = bre.readLine()) != null) {
System.out.println(s);
}
bre.close();
p2.waitFor();
} catch (IOException ex) {
ex.printStackTrace();
} catch (Exception err) {
err.printStackTrace();
}
The code above works fine for capturing the output of the test.java. But it does not display error of the test.java.
Could you please give me a sample code for fixing this problem and handling output stream or share idea? Thanks in advance
The solution I've always used is to create a separate thread to read one of the streams
So, in your case it should be something like
String s = "";
InputStream istr = p2.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(istr));
BufferedReader bre = new BufferedReader
(new InputStreamReader(p2.getErrorStream()));
new Thread(new Runnable() {
#Override
public void run() {
while ((s = br.readLine()) != null) {
System.out.println(s);
}
}
}).start();
new Thread(new Runnable() {
#Override
public void run() {
while ((s = bre.readLine()) != null) {
System.out.println(s);
}
}
}).start();
// when you are finished close streams