java解析命令行参数(common-cli)练习

最新推荐文章于 2024-05-18 08:47:54 发布

weixin_33758863

最新推荐文章于 2024-05-18 08:47:54 发布

阅读量212

点赞数

文章标签： java

本文介绍了一个Java程序如何使用Apache Commons CLI库来解析命令行参数，并展示了如何根据解析的结果设置程序行为。此外，还介绍了如何利用Java管理扩展(JMX)注册MBean以实现系统监控。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

package foo;

import org.apache.commons.cli.BasicParser;
import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.Options;

public class test {
    public static void main(String[] args) throws Exception{
        
        CommandLineParser parser = new BasicParser();
        Options options = new Options();
        options.addOption("h","help",false,"Print this usage information");
        options.addOption("v","verbose",false,"Print out VERBOSE information");
        options.addOption("f","file",true,"File to save program output to");
        //Parse the program arguments
        CommandLine commandLine = parser.parse(options, args);
        // Set the appropriate variables based on supplied options
        boolean verbose = false;
        String file = "";
        
        if(commandLine.hasOption('h')){
            System.out.println("Help Message");
            System.exit(0);
        }
        
        if(commandLine.hasOption('v')){
            verbose = true;
        }
        
        if(commandLine.hasOption('f')){
            file = commandLine.getOptionValue('f');
        }
    }
}

A class that implements the CommandLineParser interface can parse a String array according to the Options specified and return a CommandLine.

//获取配置文件
String configXmlFile = System.getProperty("Config");
//加载配置文件
AbstractApplicationContext applicationContext = new FileSystemXmlApplicationContext(
                configXmlFile);
//MBeanServer是一个包含所有注册MBean的仓库.它是JMX代理层的核心
MBeanServer mbs = java.lang.management.ManagementFactory
                .getPlatformMBeanServer();

logger.info("注册ApplicationServer.");
        ObjectName mbeanName = getApplicationObjectName();
        ApplicationServer applicationServer = new ApplicationServer();
        applicationServer.setApplicationContext(applicationContext);
        mbs.registerMBean(applicationServer, mbeanName);

public static ObjectName getApplicationObjectName()
            throws MalformedObjectNameException {
        ObjectName mbeanName = new ObjectName("fm5:name=ApplicationServer");
        return mbeanName;
    }