<dependency>
<groupId>commons-cli</groupId>
<artifactId>commons-cli</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>info.picocli</groupId>
<artifactId>picocli</artifactId>
<version>4.6.1</version>
</dependency>
import org.apache.commons.cli.*;
public class MyApp {
public static void main(String[] args) {
Options options = new Options();
options.addOption("h", "help", false, "Display help");
options.addOption("v", "verbose", false, "Enable verbose mode");
options.addOption("f", "file", true, "Input file");
CommandLineParser parser = new DefaultParser();
try {
CommandLine cmd = parser.parse(options, args);
if (cmd.hasOption("h")) {
printHelp(options);
return;
}
String inputFileName = cmd.getOptionValue("f");
} catch (ParseException e) {
System.err.println("Error parsing command line arguments: " + e.getMessage());
}
}
private static void printHelp(Options options) {
HelpFormatter formatter = new HelpFormatter();
formatter.printHelp("myapp", options);
}
}
import picocli.CommandLine;
import picocli.CommandLine.Command;
import picocli.CommandLine.Option;
import picocli.CommandLine.Parameters;
@Command(name = "myapp", mixinStandardHelpOptions = true, version = "1.0")
public class MyApp implements Runnable {
@Option(names = { "-v", "--verbose" }, description = "Enable verbose mode")
private boolean verbose;
@Option(names = { "-f", "--file" }, description = "Input file", required = true)
private String inputFile;
@Override
public void run() {
}
public static void main(String[] args) {
CommandLine.run(new MyApp(), args);
}
}
CommandLineParser parser = new DefaultParser();
try {
CommandLine cmd = parser.parse(options, args);
if (cmd.hasOption("h")) {
printHelp(options);
return;
}
String inputFileName = cmd.getOptionValue("f");
} catch (ParseException e) {
System.err.println("Error parsing command line arguments: " + e.getMessage());
}
CommandLine.run(new MyApp(), args);
javac -cp commons-cli-1.4.jar MyApp.java
java -cp commons-cli-1.4.jar:. MyApp -h
javac -cp picocli-4.6.1.jar MyApp.java
java -cp picocli-4.6.1.jar:. MyApp -h
