commons-cli命令行传参

参考链接

导入依赖

    <dependencies>
        <dependency>
            <groupId>commons-cli</groupId>
            <artifactId>commons-cli</artifactId>
            <version>1.4</version>
        </dependency>
    </dependencies>

简介

common-cli组件是一个解析命令参数的jar包，它能解析gnu风格参数、posix风格参数。精简而又强大，大小仅由二十多个class组成，maven地址如下：
传参示例java -jar CommandLine.jar -in a.txt -out b.txt -o options

一个example

import org.apache.commons.cli.*;
public class Arguments {
    private static Arguments arguments;
    private static String projectName = "CommandLine Test";
    private String[] args;
    // 解析存储的参数
    String inFilePath;
    String outFilePath;
    long longNum;
    int intNum;
    String option;
    private Arguments(String[] args) {
        this.args = args;
    }
    public static Arguments getInstance(String[] args) {
        arguments = new Arguments(args);
        arguments.initFromCmd();
        return arguments;
    }
    private void initFromCmd() {
        Options options = new Options();
        options.addRequiredOption("in", "data", true, "(Required) File path of data set");
        options.addRequiredOption("out", "output", true, "(Required) File path of output");
        options.addOption("l", "longNum", true, "a long type number");
        options.addOption("i", "intNum", true, "a int type number");
        options.addOption("o", "option", true, "a option parameter");
        options.addOption("h", "help", false, "Help");
        CommandLineParser parser = new DefaultParser();
        HelpFormatter formatter = new HelpFormatter();
        CommandLine cmd = null;
        try {
            cmd = parser.parse(options, args);
            if (cmd.hasOption("h")) {
                formatter.printHelp(projectName, options);
                System.exit(0);
            }
        } catch (ParseException e) {
            formatter.printHelp(projectName, options);
            System.out.println("运行了catch");
            System.exit(1);
        }
        // 提取参数到成员变量
        inFilePath = cmd.getOptionValue("in");
        outFilePath = cmd.getOptionValue("out", inFilePath + "_result");
        longNum = Long.parseLong(cmd.getOptionValue("s", "0"));
        intNum = Integer.parseInt(cmd.getOptionValue("i", "0"));
        option = cmd.getOptionValue("o", "null");
    }
}

public class Main {
    public static void main(String[] args) {
        if (args.length == 0) {
            System.out.println("没有命令行参数运行");
            System.exit(0);
        }
        Arguments arguments = Arguments.getInstance(args);
        System.out.println("打印输入的命令行参数：");
        System.out.println("输入的intNum: " + arguments.intNum);
        System.out.println("输入的longNum: " + arguments.longNum);
        System.out.println("输入的inFilePath: " + arguments.inFilePath);
        System.out.println("输入的outFilePath: " + arguments.outFilePath);
        System.out.println("输入的option: " + arguments.option);
    }
}