package java_processbuilder; import java.io.File; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.PrintWriter; import java.util.logging.Level; import java.util.logging.Logger; /** * * @web java-buddy.blogspot.com */ public class Java_ProcessBuilder { public static void main(String[] args) { // Example to run "dir" in Windows String[] command = {"cmd", "/c", "dir"}; StringBuilder cmdReturn = new StringBuilder(); try { //print to System.out PrintWriter printWriter_out = new PrintWriter(System.out, true); //print to file, text.txt File file = new File("test.txt"); file.createNewFile(); try (PrintWriter printWriter_file = new PrintWriter(new FileWriter(file))) { ProcessBuilder processBuilder = new ProcessBuilder(command); Process process = processBuilder.start(); try (InputStream inputStream = process.getInputStream()) { int c; while ((c = inputStream.read()) != -1) { cmdReturn.append((char) c); } } //System.out.println(cmdReturn.toString()); printWriter_out.println(cmdReturn.toString()); printWriter_file.println(cmdReturn.toString()); } } catch (IOException ex) { Logger.getLogger(Java_ProcessBuilder.class.getName()) .log(Level.SEVERE, null, ex); } } }
Wednesday, December 11, 2013
Example of using PrintWriter
This example show a how to use PrintWriter to print to System.out and file. PrintWriter prints formatted representations of objects to a text-output stream. We will use last example of "ProcessBuilder to create operating system processes" to get input from.
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