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Library to manage system processes using Java
/*
* Copyright 2016 Javier Garcia Alonso.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jutils.jprocesses.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Locale;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Utility methods
*
* @author Javier Garcia Alonso
*/
@SuppressWarnings("Since15")
public class ProcessesUtils {
private static final String CRLF = "\r\n";
private static String customDateFormat;
private static Locale customLocale;
//Hide constructor
private ProcessesUtils() {
}
public static String executeCommand(String... command) {
String commandOutput = null;
try {
ProcessBuilder processBuilder = new ProcessBuilder(command);
processBuilder.redirectErrorStream(true); // redirect error stream to output stream
commandOutput = readData(processBuilder.start());
} catch (IOException ex) {
Logger.getLogger(ProcessesUtils.class.getName()).log(Level.SEVERE, null, ex);
}
return commandOutput;
}
private static String readData(Process process) {
StringBuilder commandOutput = new StringBuilder();
BufferedReader processOutput = null;
try {
processOutput = new BufferedReader(new InputStreamReader(process.getInputStream()));
String line;
while ((line = processOutput.readLine()) != null) {
if (!line.isEmpty()) {
commandOutput.append(line).append(CRLF);
}
}
} catch (IOException ex) {
Logger.getLogger(ProcessesUtils.class.getName()).log(Level.SEVERE, null, ex);
} finally {
try {
if (processOutput != null) {
processOutput.close();
}
} catch (IOException ioe) {
Logger.getLogger(ProcessesUtils.class.getName()).log(Level.SEVERE, null, ioe);
}
}
return commandOutput.toString();
}
public static int executeCommandAndGetCode(String... command) {
Process process;
try {
process = Runtime.getRuntime().exec(command);
process.waitFor();
} catch (IOException ex) {
Logger.getLogger(ProcessesUtils.class.getName()).log(Level.SEVERE, null, ex);
return -1;
} catch (InterruptedException ex) {
Logger.getLogger(ProcessesUtils.class.getName()).log(Level.SEVERE, null, ex);
return -1;
}
return process.exitValue();
}
/**
* Parse Window DateTime format to time format (hh:mm:ss).
*
* @param dateTime original datetime format
* @see
*
* https://msdn.microsoft.com/fr-fr/library/windows/desktop/aa387237(v=vs.85).aspx
*
* @return string with formatted time (hh:mm:ss)
*/
public static String parseWindowsDateTimeToSimpleTime(String dateTime) {
String returnedDate = dateTime;
if (dateTime != null && !dateTime.isEmpty()) {
String hour = dateTime.substring(8, 10);
String minutes = dateTime.substring(10, 12);
String seconds = dateTime.substring(12, 14);
returnedDate = hour + ":" + minutes + ":" + seconds;
}
return returnedDate;
}
/**
* Parse Window DateTime format to time format (MM/dd/yyyy hh:mm:ss)
*
* @param dateTime original datetime format
* @see
*
* https://msdn.microsoft.com/fr-fr/library/windows/desktop/aa387237(v=vs.85).aspx
*
* @return string with formatted time (mm/dd/yyyy HH:mm:ss)
*/
public static String parseWindowsDateTimeToFullDate(String dateTime) {
String returnedDate = dateTime;
if (dateTime != null && !dateTime.isEmpty()) {
String year = dateTime.substring(0, 4);
String month = dateTime.substring(4, 6);
String day = dateTime.substring(6, 8);
String hour = dateTime.substring(8, 10);
String minutes = dateTime.substring(10, 12);
String seconds = dateTime.substring(12, 14);
returnedDate = month + "/" + day + "/" + year + " " + hour + ":"
+ minutes + ":" + seconds;
}
return returnedDate;
}
/**
* Parse Unix long date format(ex: Fri Jun 10 04:35:36 2016) to format
* MM/dd/yyyy HH:mm:ss
*
* @param longFormatDate original datetime format
*
* @return string with formatted date and time (mm/dd/yyyy HH:mm:ss)
*/
public static String parseUnixLongTimeToFullDate(String longFormatDate) throws ParseException {
DateFormat targetFormat = new SimpleDateFormat("MM/dd/yyyy HH:mm:ss");
List formatsToTry = new ArrayList();
formatsToTry.addAll(Arrays.asList("MMM dd HH:mm:ss yyyy", "dd MMM HH:mm:ss yyyy"));
List localesToTry = new ArrayList();
localesToTry.addAll(Arrays.asList(Locale.getDefault(),
Locale.getDefault(Locale.Category.FORMAT),
Locale.ENGLISH)
);
if (getCustomDateFormat() != null) {
formatsToTry.add(0, getCustomDateFormat());
}
if (getCustomLocale() != null) {
localesToTry.add(0, getCustomLocale());
}
ParseException lastException = null;
for (Locale locale : localesToTry) {
for (String format : formatsToTry) {
DateFormat originalFormat = new SimpleDateFormat(format, locale);
try {
return targetFormat.format(originalFormat.parse(longFormatDate));
} catch (ParseException ex) {
lastException = ex;
}
}
}
throw lastException;
}
public static String getCustomDateFormat() {
return customDateFormat;
}
/**
* Custom date format to be used when parsing date string in "ps" output
* NOTE: We assume 5 space separated fields for date, where we pass the last 4 to the parser, e.g.
* for input text søn 23 okt 08:30:00 2016 we would send 23 okt 08:30:00 2016
* to the parser, so a pattern dd MMM HH:mm:ss yyyy would work.
* @param dateFormat the custom date format string to use
*/
public static void setCustomDateFormat(String dateFormat) {
customDateFormat = dateFormat;
}
public static Locale getCustomLocale() {
return customLocale;
}
/**
* Sets a custom locale if the defaults won't parse your ps output
* @param customLocale the Locale object to use
*/
public static void setCustomLocale(Locale customLocale) {
ProcessesUtils.customLocale = customLocale;
}
}