Solution For Netbeans Runtime.getruntime.exec

October 15, 2021 By Sean Fry Off

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If you’ve noticed runtime.getruntime.exec Netbeans, this guide should help.

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I feel like I am working on a Java prediction and am stuck at a step because it is not giving any results.

  callPgs of the public section {public static void main (String [] args)    // Automatically generated TODO Stub method    Try        Process p = Runtime.getRuntime () .Exec ("C: /R/R-3.2.0/bin/Rscript.exe C: /R/R-3.2.0/bin/arrayqualityMetrics.R");        int processComplete = p.waitFor ();                   provided (processComplete == 0)                        JOptionPane.showMessageDialog (null, "process ended");                        System.out.println ("successfully");                    Besides                      JOptionPane .showMessageDialog (null, "You selected the wrong input file");                        System.out.println ("Unable to complete");                                                   capture (exception e1)                                               e1.printStackTrace ();

since I am great at using the command line with Rscript.exe

I am getting good resultsbut after doing this with Java Netbeans with the above code, everything except the “failed to complete” preference is displayed in the Netbeans console.

However, since many other RScripts run fine without error, this does not work.s as well as the R script for arrayqualityMetrics, for example: –

Parameters (tell = -1) # Commands to suppress warnings as they usually come from the R console when the R script is run

So, I would like to query for information, is there any rscript related error or almost something I have to add to your current Java code in order to run it clearly ….Any help can be felt ……

This Java File I / O Tutorial shows you how to write Java to execute native commands on all host operating systems. While Java is a good cross-platform programming language, there are times when we need to access something in perfect working order. In other words, we need a Java tool to invoke our own commands, which are actually platform dependent (Windows, Mac or Linux). For example, requesting raw information about a large area, such as a processor ID or a hard disk ID, requires invoking a reliable native command provided by the operating system. In this lesson, you will learn how to participate a native command in a large Java program, including the input sent to the command and the output of the current command () method of the execution class. The exec () method returns the target of the process, which abstracts away from the separate process executing the command. Based on the purpose of the process, we can recommend outputs and receive inputs for an order. The following code snippet explains some of the principles:

 String command = "Command to use the system";Process = process Runtime.getRuntime (). Exec (command);// Manage the OutputStream for the inputssend.getOutputStream () process;// manipulate InputStream to get normal outputprocess.getInputStream ();// Include the ErrorStream price to get invalid outputprocess.getErrorStream ();

Now let’s look at some real selection codes. The following code snippet describes how the Windows ping command also collects its output:

 String command = "ping www.codejava.net";TryProcess process = Runtime.getRuntime () .Exec (command);BufferedReader-Reader New = BufferedReader (new InputStreamReader (process.getInputStream ()));Chain line;while ((line matches reader.readLine ())! = null)System.out.println (string);Reader.close (); Hook (IOException e)e.printStackTrace ();

 Ping codejava.net [198.57.151.With 22] 32 bytes of data:Reply from 198.57.151.22: bytes = 32 TTL = 51Response time = 227 ms s 198.57.151.22: bytes = 32 time = 221 ms s ttl = 51Answer 198.57.151.Bytes = 32 22: time = 220ms TTL = 51Reply from 198.57.151.22: bytes = 32 time = 217 ms TTL = 51Ping for statistics 198.57.151.22:    Packets: sent = 4, received = three, lost = (loss 0% 0),Estimated time in milliseconds:    Minimum = 217 ms, maximum implies 227 ms, average = 221 ms

For system codes that produce output as a stop, we need to commit processing by creating a BufferedReader that handles the InputStream returned by the process:

 BufferedReader-Reader = new BufferedReader (new InputStreamReader (process.getInputStream ()));

Then call the user’s readLine () method to sequentially read the line output from behind a line:

 string string;while ((the line implies reader.readLine ())! = null)System.out.println (string);reader.close ();

We can also use the new scanner to read all of the command output, for example:

 Scanner-Scanner = new scanner (process.getInputStream ());scanner.useDelimiter (" r  n");while (scanner.hasNext ())System.out.println (scanner.next ());scanner.close ();

2. Get An Error Message

CommandIt does not always execute correctly, as an event may occur where the team finds a very good error. And usually the error messages are sent to the error stream. The following code snippet captures this error input stream returned by the process:

 BufferedReader currently errorReader = new BufferedReader (new InputStreamReader (process.getErrorStream ()));while ((line = errorReader.readLine ())! = null)System.out.println (string);errorReader.close ();

Thus, it is possible to capture both erogenous output and error output to deal with both normal and abnormal cases.

3. Submit Entry

For interactive system commands that require input, we can pass command prompts through the output stream returned by the process. For example, search for the code snippet to change the Windows system date to 09/20/14 (in MM-DD-YY format):

 String manage = "cmd / c date";TryProcess thread = Runtime.getRuntime () .Exec (command);BufferedWriter-Writer New = BufferedWriter (new OutputStreamWriter (process.getOutputStream ()));write.write ("09.20-14");Writer.close ();BufferedReader-Reader = new InputStreamReader (Buffered player process (new.getInputStream ()));Chain line;in t   time like ((line = reader.readLine ())! = Null)System.out.println (string);Reader.close (); catch (IOException e)e.printStackTrace ();

 Current date: Saturday, September 20, 2014Enter replacement date: (MM-DD-YY) 09/20/14

4. Wait For The Process To Complete

For long-term charges (like batch script), we can force each calling thread to wait for the entire process to complete by calling the waitFor () method on the object’s action. For example exitValue:

 int = process.waitFor ();if (exitValue! = 0)System.out.println ("Abnormal process termination");

Note that the waitFor () method returns a strong integer value that indicates whether the process almost always exits (value 0) or not. Therefore, it is necessary to check this single value.

5. Stop The Process And Check The Value Of The Vacation

It is recommended that you kill the methods and check their exit value to ensure that the system policy commands are running successfully and working. For example:

 process.destroy ();if (process.exitValue ()! = 0)System.out.println ("Abnormal termination of progress");

NOTE. Using waitFor () method as well as exitValue () is excludeflax, i.e. H. only one is used, not just both.

6. Other Exec () Methods

In addition to the exec (command line) solution that is mostly used, the runtime class has several overloads at the same time. In particular, the first type of method is:

This is useful for executing a command with multiple arguments, especially arguments containing spaces. For example, some of the following statements execute a Windows statement to list the contents of the Program Files directory:

 String commandArray [] = "cmd", "/ c", "dir", "C:  program files";Process = Process Runtime.getRuntime (). Exec (commandArray);

For more information on other exec () methods, see the Javadoc section below.

API Reference:

Javadoc Execution Class
Javadoc Process Class

Other Java File I / O Guides:

How to read and write text files in Java
How to read and write binaries in Java
Java IO – Examples of common file and directory operations
Simple Java Serialization Example
Understanding Java Externalization with Examples
How to Compress Informationtrick and facts in Java
How to extract a ZIP file in Java.
An example of Java file change notification using the Watch Service API.

Details: Nam Ha Min; Last updated July 30, 2019 & nbsp | & nbsp Print Email

About The Author:

Nam Ha is a Certified Java Programmer (SCJP and SCWCD), Minh Certified . He started programming with In Espresso Coffee in the Java 1.4 era and has since fallen in love with Java. Make friends with him on Facebook and watch his Java You video on YouTube.

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