links for 2011-08-09

• Load a text file contents as a String
  import java.io.File;
  import java.io.FileReader;
  import java.io.IOException;

  public class Main {
  public static String deserializeString(File file)
  throws IOException {
  int len;
  char[] chr = new char[4096];
  final StringBuffer buffer = new StringBuffer();
  final FileReader reader = new FileReader(file);
  try {
  while ((len = reader.read(chr)) > 0) {
  buffer.append(chr, 0, len);
  }
  } finally {
  reader.close();
  }
  return buffer.toString();
  }
  }

  (tags: java programming load text file as string tips software developement read contents)
• Java Practices -> Parse text
  protected void processLine(String aLine){
  //use a second Scanner to parse the content of each line
  Scanner scanner = new Scanner(aLine);
  scanner.useDelimiter("=");
  if ( scanner.hasNext() ){
  String name = scanner.next();
  String value = scanner.next();
  log("Name is : " + quote(name.trim()) + ", and Value is : " + quote(value.trim()) );
  }
  else {
  log("Empty or invalid line. Unable to process.");
  }
  //no need to call scanner.close(), since the source is a String
  }
  (tags: java parse text token tips programmins software development)
• Commons Exec – Apache Commons Exec Tutorial
  You look at Commons Exec and think "Wow – calling Runtime.exec() is easy and the Apache folks are wasting their and my time with tons of code". Well, we learned it the hard way that using plain Runtime.exec() can be a painful experience [...] you are invited to delve into commons-exec and have a look at the hard lessons the easy way…

  CommandLine cmdLine = new CommandLine("AcroRd32.exe");
  cmdLine.addArgument("/p");
  cmdLine.addArgument("/h");
  cmdLine.addArgument("${file}");
  HashMap map = new HashMap();
  map.put("file",new File("invoice.pdf"));
  commandLine.setSubstitutionMap(map);
  DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();
  ExecuteWatchdog watchdog=new ExecuteWatchdog(60*1000);
  Executor executor = new DefaultExecutor();
  executor.setExitValue(1);
  executor.setWatchdog(watchdog);
  executor.execute(cmdLine, resultHandler);
  //some time later the result handler callback was invoked so we can safely request the exit value
  int exitValue=resultHandler.waitFor();

  (tags: java programming software development run external programs command apache commons-exec commons exec tips)
• DefaultExecutorTest.java
  Apache Commons-exec samples
  (tags: java programming software development run external program command tips)
• How can I capture the output of a command as a String with Commons Exec?
  Commons exec provides a PumpStreamHandler which redirects standard output to the Java process' standard output. How can I capture the output of the command into a String? He're what I found:

  import java.io.ByteArrayOutputStream;
  import org.apache.commons.exec.CommandLine;
  import org.apache.commons.exec.DefaultExecutor;
  import org.apache.commons.exec.Executor;
  import org.apache.commons.exec.PumpStreamHandler;

  public String execToString(String command) throws Exception {
  ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
  CommandLine commandline = CommandLine.parse(command);
  DefaultExecutor exec = new DefaultExecutor();
  PumpStreamHandler streamHandler = new PumpStreamHandler(outputStream);
  exec.setStreamHandler(streamHandler);
  exec.execute(commandline);
  return(outputStream.toString());
  }

  (tags: java run external program process apache commons-exec commons exec tips programming software development interface execute command capture output)