如何在Java中解析命令行参数？ [英] How do I parse command line arguments in Java?

问题描述

在Java中解析命令行参数的好方法是什么？

What is a good way of parsing command line arguments in Java?

推荐答案

最近的后起之秀是 picocli （ANSI颜色，命令行自动完成，注释和编程API等）。

A recent rising star is picocli (ANSI colors, command line autocompletion, both annotations and programmatic API, and more).

同时检查这些（旧）：

• http://commons.apache.org/cli/


• http://www.martiansoftware.com/jsap/

• http://commons.apache.org/cli/
• http://www.martiansoftware.com/jsap/

或者自己动手：

• http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html

• http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html

例如，这就是你使用 commons-cli 解析2个字符串参数：

For instance, this is how you use commons-cli to parse 2 string arguments:

import org.apache.commons.cli.*;

public class Main {


    public static void main(String[] args) throws Exception {

        Options options = new Options();

        Option input = new Option("i", "input", true, "input file path");
        input.setRequired(true);
        options.addOption(input);

        Option output = new Option("o", "output", true, "output file");
        output.setRequired(true);
        options.addOption(output);

        CommandLineParser parser = new DefaultParser();
        HelpFormatter formatter = new HelpFormatter();
        CommandLine cmd;

        try {
            cmd = parser.parse(options, args);
        } catch (ParseException e) {
            System.out.println(e.getMessage());
            formatter.printHelp("utility-name", options);

            System.exit(1);
        }

        String inputFilePath = cmd.getOptionValue("input");
        String outputFilePath = cmd.getOptionValue("output");

        System.out.println(inputFilePath);
        System.out.println(outputFilePath);

    }

}

来自命令的用法line：

usage from command line:

$> java -jar target/my-utility.jar -i asd                                                                                       
Missing required option: o

usage: utility-name
 -i,--input <arg>    input file path
 -o,--output <arg>   output file

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