processbuilder

问题 I have tried coding a servlet which creates a file based on the inputs given to it.The file gets created along with appropriate text but I am unable to give the file 777 permissions and I am also unable to run ProcessBuilder later. I thought it is inter related because the command fired in ProcessBuilder would require the file to have appropriate permissions but when I try giving it permissions using chmod it doesn't work either. import java.io.*; import java.util.Enumeration; import javax

问题 I am currently running a .class file as a process. The .class file is a simple program that asks the user to input a number, takes the input and prints the user's input back to the screen. Up to now, i have managed to print the "Enter a number: " statement from the process on the console through InputStream and write the input entered by the user through OutputStream . I am unable to print the last statements on the screen, which should be "You entered : " + userinput My code is: String

问题 I'm trying to execute applications from java servlet . When I run it on eclipse integrated tomcat its working fine. When I'm trying to do the same on os integrated tomcat server by deploying .war file into webapps, its not working. It doesn't encountering any error as well. Even I checked the logs, there is no error nothing but usual tomcat access log. Is there any other ways that I can execute applications like firefox, chrome, gedit etc. Note: Basic bash commands like ls, chmod, mkdir were

问题 I created an executable jar and executed it using process builder from another java program. Here's my code - public class SomeClass { public static void main(String[] args) { Process p = null; ProcessBuilder pb = new ProcessBuilder("java", "-jar", "src.jar"); pb.directory(new File("/Users/vivek/servers/azkaban-0.10/TestApp/src")); try { p = pb.start(); } catch(Exception ex) { ex.printStackTrace(); } } } I'm trying to now debug the src.jar from eclipse. I provided the project src as external

问题 I have a batch script which takes input as user name and age and prints both the inputs. I want to write a java program to execute that script and pass the inputs. I have written the java program using ProcessBuilder. I am also passing the username and age in the process OutputStream but only user name is getting printed and age is missing. my script(test.bat file) : @echo off echo executing test.bat set /p name=Enter Name: set /p age=Enter Age : echo Hi %name%, you are %age% years old. my

问题 A very good article (When Runtime.exec() won't) says: The only possible time you would use exitValue() instead of waitFor() would be when you don't want your program to block waiting on an external process that may never complete. Instead of using the waitFor() method, I would prefer passing a boolean parameter called waitFor into the exitValue() method to determine whether or not the current thread should wait. A boolean would be more beneficial because exitValue() is a more appropriate name

问题 I am trying to run an async process and I do not want the program to wait until the end of these processes executions. I found this question how to run shell script asynchronously from within Java program but it doesn't have the answer that I am looking for. What I am doing is I am simply running bash processes and after I run it, I do not want the Java program to wait until it's finished. This is what I have done: public void runCommandLine(String directory) throws IOException { Thread

问题 Please move down to the 2nd update. I didn't want to change the previous context of this question. I'm using wkhtmltoimage from a Java app. The standard way of using it is - path-to-exe http://url.com/ image.png . According to their docs, if we write a - instead of an input URL, the input shifts to STDIN. I'm starting the process using ProcessBuilder - ProcessBuilder pb = new ProcessBuilder(exe_path, " - ", image_save_path); Process process = pb.start(); Now I'm unable to figure out how to

问题 I've been trying to figure out how to pipe a few processes in Java using the new ProcessBuilder . I can't find a suitable example of what I want to do and when I try to do it myself the process just hangs. I would appreciate a very simple example of some code that runs the equivalent of cat test.txt | wc , but not through a shell. --Update-- OK, just to clarify. I know there are ways to simulate a pipe by reading and writing streams. I'm wondering if that's done in some automatic way by the

问题 I would like to pass multiple parameters to a processBuilder and the parameters to be separated by a space. Here is the command, String[] command_ary = {dir+"library/crc"," -s ", fileName," ",addressRanges}; I need to provide a space after "fcrc" and after "-p" and in between "filename" and the "addressRange". Thank you 回答1: You don't need to include spaces. The ProcessBuilder will deal with that for you. Just pass in your arguments one by one, without space: ProcessBuilder pb = new