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Commons CLI API - Long Options Example
Where to get a Java example of managing long options with Commons CLI API?
✍: FYIcenter.com
Here is good Java example of managing long options with Commons CLI API,
ShortOptionTest.java:
// Copyright (c) 2018 FYIcenter.com
import org.apache.commons.cli.Options;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.UnrecognizedOptionException;
public class LongOptionTest {
public static void main(String[] args) throws Exception {
// Define a long option: --help -help -h
Options options = new Options();
options.addOption("h", "help", false, "Print this help message");
try {
// Parse options
CommandLineParser parser = new DefaultParser();
CommandLine cmd = parser.parse(options, args);
// Process options
if (cmd.hasOption("help")) {
help(options);
}
} catch (UnrecognizedOptionException e) {
System.out.println("Invalid options: "+e.getOption());
help(options);
}
}
public static void help(Options options) {
// Print options
HelpFormatter formatter = new HelpFormatter();
formatter.printHelp("LongOptionTest", options);
}
}
You can compile and run it with commons-cli-1.4.jar:
C:\fyicenter>javac -cp C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar LongOptionTest.java C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar LongOptionTest -h usage: LongOptionTest -h,--help Print this help message C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar LongOptionTest --help usage: LongOptionTest -h,--help Print this help message C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar LongOptionTest -help usage: LongOptionTest -h,--help Print this help message C:\fyicenter>java -cp .;C:\fyicenter\commons-cli-1.4\commons-cli-1.4.jar LongOptionTest -helps Invalid options: -helps usage: LongOptionTest -h,--help Print this help message
⇒ Commons CLI API - Options with Arguments
⇐ Commons CLI API - Long Options
2020-12-15, ∼1612🔥, 0💬
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