Java/Development Class/ProcessBuilder
Содержание
Exec Helper
<source lang="java">
/*
* Convenience methods for executing non-Java processes. * Copyright (C) 2005 Stephen Ostermiller * http://ostermiller.org/contact.pl?regarding=Java+Utilities * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * See COPYING.TXT for details. */
import java.io.*; /**
* Convenience methods for executing non-Java processes. * More information about this class is available from . * * @author Stephen Ostermiller http://ostermiller.org/contact.pl?regarding=Java+Utilities * @since ostermillerutils 1.06.00 */
public final class ExecHelper {
/** * Executes the specified command and arguments in a separate process, and waits for the * process to finish.*
* Output from the process is expected to be text in the system"s default character set. * <p> * No input is passed to the process on STDIN. * * @param cmdarray array containing the command to call and its arguments. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if cmdarray is null * @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0). * * @since ostermillerutils 1.06.00 */ public static ExecHelper exec(String[] cmdarray) throws IOException { return new ExecHelper(Runtime.getRuntime().exec(cmdarray), null); } /** * Executes the specified command and arguments in a separate process, and waits for the * process to finish. * <p> * Output from the process is expected to be text in the system"s default character set. * <p> * No input is passed to the process on STDIN. * * @param cmdarray array containing the command to call and its arguments. * @param envp array of strings, each element of which has environment variable settings in format name=value. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if cmdarray is null * @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0). * * @since ostermillerutils 1.06.00 */ public static ExecHelper exec(String[] cmdarray, String[] envp) throws IOException { return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp), null); } /** * Executes the specified command and arguments in a separate process, and waits for the * process to finish. * <p> * Output from the process is expected to be text in the system"s default character set. * <p> * No input is passed to the process on STDIN. * * @param cmdarray array containing the command to call and its arguments. * @param envp array of strings, each element of which has environment variable settings in format name=value. * @param dir the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if cmdarray is null * @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0). * * @since ostermillerutils 1.06.00 */ public static ExecHelper exec(String[] cmdarray, String[] envp, File dir) throws IOException { return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp, dir), null); } /** * Executes the specified command and arguments in a separate process, and waits for the * process to finish. * <p> * No input is passed to the process on STDIN. * * @param cmdarray array containing the command to call and its arguments. * @param charset Output from the executed command is expected to be in this character set. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if cmdarray is null * @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0). * * @since ostermillerutils 1.06.00 */ public static ExecHelper exec(String[] cmdarray, String charset) throws IOException { return new ExecHelper(Runtime.getRuntime().exec(cmdarray), charset); } /** * Executes the specified command and arguments in a separate process, and waits for the * process to finish. * <p> * No input is passed to the process on STDIN. * * @param cmdarray array containing the command to call and its arguments. * @param envp array of strings, each element of which has environment variable settings in format name=value. * @param charset Output from the executed command is expected to be in this character set. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if cmdarray is null * @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0). * * @since ostermillerutils 1.06.00 */ public static ExecHelper exec(String[] cmdarray, String[] envp, String charset) throws IOException { return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp), charset); } /** * Executes the specified command and arguments in a separate process, and waits for the * process to finish. * <p> * No input is passed to the process on STDIN. * * @param cmdarray array containing the command to call and its arguments. * @param envp array of strings, each element of which has environment variable settings in format name=value. * @param dir the working directory of the subprocess, or null if the subprocess should inherit the working directory of the current process. * @param charset Output from the executed command is expected to be in this character set. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if cmdarray is null * @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0). * * @since ostermillerutils 1.06.00 */ public static ExecHelper exec(String[] cmdarray, String[] envp, File dir, String charset) throws IOException { return new ExecHelper(Runtime.getRuntime().exec(cmdarray, envp, dir), charset); } /** * Executes the specified command using a shell. On windows uses cmd.exe or command.exe. * On other platforms it uses /bin/sh. * <p> * A shell should be used to execute commands when features such as file redirection, pipes, * argument parsing are desired. * <p> * Output from the process is expected to be text in the system"s default character set. * <p> * No input is passed to the process on STDIN. * * @param command String containing a command to be parsed by the shell and executed. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if command is null * * @since ostermillerutils 1.06.00 */ public static ExecHelper execUsingShell(String command) throws IOException { return execUsingShell(command, null); } /** * Executes the specified command using a shell. On windows uses cmd.exe or command.exe. * On other platforms it uses /bin/sh. * <p> * A shell should be used to execute commands when features such as file redirection, pipes, * argument parsing are desired. * <p> * No input is passed to the process on STDIN. * * @param command String containing a command to be parsed by the shell and executed. * @param charset Output from the executed command is expected to be in this character set. * @return The results of the execution in an ExecHelper object. * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if command is null * * @since ostermillerutils 1.06.00 */ public static ExecHelper execUsingShell(String command, String charset) throws IOException { if (command == null) throw new NullPointerException(); String[] cmdarray; String os = System.getProperty("os.name"); if (os.equals("Windows 95") || os.equals("Windows 98") || os.equals("Windows ME")){ cmdarray = new String[]{"command.exe", "/C", command}; } else if (os.startsWith("Windows")){ cmdarray = new String[]{"cmd.exe", "/C", command}; } else { cmdarray = new String[]{"/bin/sh", "-c", command}; } return new ExecHelper(Runtime.getRuntime().exec(cmdarray), charset); } /** * Take a process, record its standard error and standard out streams, wait for it to finish * * @param process process to watch * @throws SecurityException if a security manager exists and its checkExec method doesn"t allow creation of a subprocess. * @throws IOException - if an I/O error occurs * @throws NullPointerException - if cmdarray is null * @throws IndexOutOfBoundsException - if cmdarray is an empty array (has length 0). * * @since ostermillerutils 1.06.00 */ private ExecHelper(Process process, String charset) throws IOException { StringBuffer output = new StringBuffer(); StringBuffer error = new StringBuffer(); Reader stdout; Reader stderr; if (charset == null){ // This is one time that the system charset is appropriate, // don"t specify a character set. stdout = new InputStreamReader(process.getInputStream()); stderr = new InputStreamReader(process.getErrorStream()); } else { stdout = new InputStreamReader(process.getInputStream(), charset); stderr = new InputStreamReader(process.getErrorStream(), charset); } char[] buffer = new char[1024]; boolean done = false; boolean stdoutclosed = false; boolean stderrclosed = false; while (!done){ boolean readSomething = false; // read from the process"s standard output if (!stdoutclosed && stdout.ready()){ readSomething = true; int read = stdout.read(buffer, 0, buffer.length); if (read < 0){ readSomething = true; stdoutclosed = true; } else if (read > 0){ readSomething = true; output.append(buffer, 0, read); } } // read from the process"s standard error if (!stderrclosed && stderr.ready()){ int read = stderr.read(buffer, 0, buffer.length); if (read < 0){ readSomething = true; stderrclosed = true; } else if (read > 0){ readSomething = true; error.append(buffer, 0, read); } } // Check the exit status only we haven"t read anything, // if something has been read, the process is obviously not dead yet. if (!readSomething){ try { this.status = process.exitValue(); done = true; } catch (IllegalThreadStateException itx){ // Exit status not ready yet. // Give the process a little breathing room. try { Thread.sleep(100); } catch (InterruptedException ix){ process.destroy(); throw new IOException("Interrupted - processes killed"); } } } } this.output = output.toString(); this.error = error.toString(); } /** * The output of the job that ran. * * @since ostermillerutils 1.06.00 */ private String output; /** * Get the output of the job that ran. * * @return Everything the executed process wrote to its standard output as a String. * * @since ostermillerutils 1.06.00 */ public String getOutput(){ return output; } /** * The error output of the job that ran. * * @since ostermillerutils 1.06.00 */ private String error; /** * Get the error output of the job that ran. * * @return Everything the executed process wrote to its standard error as a String. * * @since ostermillerutils 1.06.00 */ public String getError(){ return error; } /** * The status of the job that ran. * * @since ostermillerutils 1.06.00 */ private int status; /** * Get the status of the job that ran. * * @return exit status of the executed process, by convention, the value 0 indicates normal termination. * * @since ostermillerutils 1.06.00 */ public int getStatus(){ return status; } } </source>
Launches a process, redirecting the output of that sub-process to the output of this (the parent) process.
<source lang="java">
import java.io.BufferedReader; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Iterator; import java.util.logging.Level; import java.util.logging.Logger; /**
* Launches a process, redirecting the output of that sub-process to the output * of this (the parent) process. * * @author Klaas Waslander */
public final class ProcessLauncher {
/** the logger for this class */
private final static Logger LOGGER = Logger.getLogger(ProcessLauncher.class.getName());
private String commandLine;
private String[] commandArray;
private File baseDir;
private ArrayList listeners = new ArrayList(1);
private Process subProcess;
private boolean finished = false;
StringBuffer out = new StringBuffer();
StringBuffer err = new StringBuffer();
/**
* Constructs new process launcher with the given command line.
*/
public ProcessLauncher(String commandLine) {
this(commandLine, null);
}
public ProcessLauncher(String commandLine, File baseDir) {
this.rumandLine = commandLine;
this.baseDir = baseDir;
}
/**
* Constructs new process launcher with the given command array.
*/
public ProcessLauncher(String[] commandArray) {
this(commandArray, null);
}
public ProcessLauncher(String[] commandArray, File baseDir) {
this.rumandArray = commandArray;
this.baseDir = baseDir;
}
/**
* Constructs new process launcher with the given command element list.
*/
public ProcessLauncher(ArrayList commandList) {
this(commandList, null);
}
public ProcessLauncher(ArrayList commandList, File baseDir) {
this(toStringArray(commandList), baseDir);
}
private static String[] toStringArray(ArrayList list) {
String[] result = new String[list.size()];
Iterator iter = list.iterator();
int arrayIndex = 0;
while (iter.hasNext()) {
result[arrayIndex++] = iter.next().toString();
}
return result;
}
/**
* Classes implementing this interface can receive output generated by
* processes launched using the ProcessLauncher.
*/
public interface OutputListener {
public void standardOutput(char[] output);
public void errorOutput(char[] output);
}
/**
* Add a listener for output from the to-be-launched process.
*/
public void addOutputListener(OutputListener listener) {
this.listeners.add(listener);
}
/** fire error output event */
private void fireErr(char[] err) {
if (this.listeners.isEmpty()) {
this.err.append(out);
}
Iterator iter = this.listeners.iterator();
while (iter.hasNext()) {
((OutputListener) iter.next()).errorOutput(err);
}
}
/** fire standard output event */
private void fireOut(char[] out) {
if (this.listeners.isEmpty()) {
this.out.append(out);
}
Iterator iter = this.listeners.iterator();
while (iter.hasNext()) {
((OutputListener) iter.next()).standardOutput(out);
}
}
/**
* Get standard output, in case no listeners were registered - never returns
* null.
*/
public String getStandardOutput() {
if (!this.listeners.isEmpty()) {
throw new IllegalStateException(
"Cannot get standard output, because outputlisteners have been registered.");
}
return this.out.toString();
}
/**
* Get error output, in case no listeners were registered - never returns
* null.
*/
public String getErrorOutput() {
if (!this.listeners.isEmpty()) {
throw new IllegalStateException(
"Cannot get error output, because outputlisteners have been registered.");
}
return this.err.toString();
}
/**
* Get the commandline that is used to launch the process.
*/
public String getCommandLine() {
String usedCommand = this.rumandLine;
if (this.rumandLine == null && this.rumandArray != null) {
usedCommand = "";
for (int i = 0; i < this.rumandArray.length; i++) {
if (i > 0) {
usedCommand += " ";
}
usedCommand += this.rumandArray[i];
}
}
return usedCommand;
}
/**
* Check whether execution has finished.
*/
public boolean hasFinished() {
return finished;
}
/**
* Launches the process, and blocks until that process completes execution.
*
* @throws CommandNotExistsException
* If the command could not be executed because it does not exist
*/
public int launch() throws CommandNotExistsException {
this.err.setLength(0);
this.out.setLength(0);
BackgroundPrinter stdout = null;
BackgroundPrinter stderr = null;
try {
if (this.rumandArray != null) {
this.subProcess = Runtime.getRuntime().exec(this.rumandArray, null, this.baseDir);
} else {
this.subProcess = Runtime.getRuntime().exec(this.rumandLine, null, this.baseDir);
}
stdout = new BackgroundPrinter(subProcess.getInputStream(), false);
stderr = new BackgroundPrinter(subProcess.getErrorStream(), true);
stdout.start();
stderr.start();
// kill process and wait max 10 seconds for output to complete
int exitValue = this.subProcess.waitFor();
stdout.join(10000);
stderr.join(10000);
/*
* if (exitValue != 0) { LOGGER.fine("WARNING: exit value " + exitValue + "
* for command \"" + getCommandLine() + "\""); }
*/
return exitValue;
} catch (IOException ioe) {
// usually caused if the command does not exist at all
throw new CommandNotExistsException("Command probably does not exist: " + ioe);
} catch (Exception e) {
LOGGER
.log(Level.SEVERE, "Exception while running/launching \"" + getCommandLine() + "\".", e);
} finally {
if (this.subProcess != null) {
this.subProcess.destroy();
this.subProcess = null;
}
if (stdout != null) {
stdout.close();
}
if (stderr != null) {
stderr.close();
}
this.finished = true;
}
return -1;
}
/**
* Tries to abort the currently running process.
*/
public void abort() {
if (this.subProcess != null) {
this.subProcess.destroy();
this.subProcess = null;
}
}
/**
* Catches output from a "java.lang.Process" and writes it to either
* System.err or System.out.
*
* @author Klaas Waslander - Sun Java Center
*/
private class BackgroundPrinter extends Thread {
private InputStream in;
boolean isErrorOutput;
public BackgroundPrinter(InputStream in, boolean isErrorOutput) {
this.in = in;
this.isErrorOutput = isErrorOutput;
}
public void run() {
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(this.in));
// read buffer
char[] buf = new char[1024];
// write data to target, until no more data is left to read
int numberOfReadBytes;
while ((numberOfReadBytes = reader.read(buf)) != -1) {
char[] clearedbuf = new char[numberOfReadBytes];
System.arraycopy(buf, 0, clearedbuf, 0, numberOfReadBytes);
if (this.isErrorOutput) {
fireErr(clearedbuf);
} else {
fireOut(clearedbuf);
}
}
/*
* } catch (IOException ioe) { // ignore this: process has ended,
* causing IOException } catch (NullPointerException ioe) { // ignore
* this: there was no resulting output
*/
} catch (Exception e) {
LOGGER.log(Level.FINE, "Exception while reading from stream from subprocess.", e);
}
}
public void close() {
try {
this.in.close();
} catch (Exception e) {
LOGGER.log(Level.WARNING,
"Closing background stream for launched process caused exception.", e);
}
}
}
/**
* Exception that is thrown when a command could not be executed because it
* (probably) does not exist at all.
*
* @author Klaas Waslander
*/
public static class CommandNotExistsException extends RuntimeException {
/**
* Construct a new exception for a command that does not exist.
*
* @param msg
* The message for this exception.
*/
public CommandNotExistsException(String msg) {
super(msg);
}
}
}
</source>
ProcessBuilder Demo
<source lang="java">
class MainClass {
public static void main(String args[]) {
try {
ProcessBuilder proc = new ProcessBuilder("notepad.exe", "testfile");
proc.start();
} catch (Exception e) {
System.out.println("Error executing notepad.");
}
}
}
</source>
Process Watcher
<source lang="java">
/**
* * vpc-commons library * * Description: <start><end> * * Copyright (C) 2006-2008 Taha BEN SALAH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * */
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; /**
**
* Process process = Runtime.getRuntime().exec(new String[]{"/bin/java","-version"}, null, new File("."));
* ProcessWatcher w = new ProcessWatcher(process, new ProcessWatcherHandler() {
* public void started(Process process) {
* System.out.println("Prcess started");
* }
*
* public void stdout(Process process, String line) {
* System.out.println(line);
* }
*
* public void stderr(Process process, String line) {
* System.err.println(line);
* }
*
* public void ended(Process process, int value) {
* System.out.println("Process Shutdown. Exit Value :" + value);
* }
*
* public void error(Process process, Throwable th) {
* System.err.println(th);
* }
* });
* w.start();
*
* @author Taha Ben Salah (taha.bensalah@gmail.ru) * @creationtime 27 juin 2007 12:08:13 */
public class ProcessWatcher {
private Process process; private Thread end; private Thread out; private Thread err; private int result; private boolean stopped=false; private ProcessWatcherHandler handler;
public ProcessWatcher(Process theProcess, ProcessWatcherHandler theHandler) {
this.process = theProcess;
this.handler = theHandler;
end=new Thread(){
@Override
public void run() {
try {
result = process.waitFor();
handler.ended(process,result);
} catch (Throwable e) {
handler.error(process,e);
} finally{
stopped=true;
}
}
};
out=new Thread(){
@Override
public void run() {
String read;
BufferedReader in=new BufferedReader(new InputStreamReader(process.getInputStream()));
while (!stopped) {
try {
read = in.readLine();
if (read == null) {
break;
}
handler.stdout(process,read);
} catch (Throwable e) {
handler.error(process,e);
break;
}
}
}
};
err=new Thread(){
@Override
public void run() {
String read;
BufferedReader in=null;
try {
in = new BufferedReader(new InputStreamReader(process.getErrorStream()));
while (!stopped) {
try {
read = in.readLine();
if (read == null) {
break;
}
handler.stderr(process,read);
} catch (Throwable e) {
handler.error(process,e);
break;
}
}
} catch(Throwable e) {
handler.error(process,e);
} finally {
if (in!=null) {
try {
in.close();
} catch (IOException e) {
handler.error(process,e);
}
}
}
}
};
}
public void start(){
handler.started(process);
end.start();
out.start();
err.start();
}
public int waitfor(){
while(!stopped){
Thread.yield();
}
return result;
}
} /**
* * vpc-commons library * * Description: <start><end> * * Copyright (C) 2006-2008 Taha BEN SALAH * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * */
/**
* @author Taha Ben Salah (taha.bensalah@gmail.ru)
* @creationtime 27 juin 2007 12:08:46
*/
interface ProcessWatcherHandler {
public void started(Process process);
public void stdout(Process process,String line);
public void stderr(Process process,String line);
public void ended(Process process,int value);
public void error(Process process,Throwable th);
}
</source>
Use of ProcessBuilder that duplicates the functions of the DoRuntime example:
<source lang="java">
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.Arrays; public class Main {
public static void main(String args[]) throws IOException {
Process process = new ProcessBuilder(args).start();
InputStream is = process.getInputStream();
InputStreamReader isr = new InputStreamReader(is);
BufferedReader br = new BufferedReader(isr);
String line;
System.out.printf("Output of running %s is:", Arrays.toString(args));
while ((line = br.readLine()) != null) {
System.out.println(line);
}
}
}
</source>
Use ProcessBuilder.environment()
<source lang="java">
/*
* Copyright (c) 1995 - 2008 Sun Microsystems, Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of Sun Microsystems nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
import java.util.Map; public class PassEnv {
public static void main(String[] args) throws java.io.IOException {
System.out.println(System.getProperty("java.class.path"));
ProcessBuilder pb = new ProcessBuilder("java", "Env", "DRAGONBALLS");
Map<String, String> env = pb.environment();
env.put("DRAGONBALLS", "7");
pb.start();
}
}
</source>
