Commons CLI使用

原来粗略的浏览过apache Commons CLI,今天有个项目用到了，竟然没有印象，又重新浏览了一下，在此纪录一下。

Apache Commons CLI library为用户提供了一个解释命令行的API.它在解释命令行时主要有三个状态，即：定义、解释和询问交互。

代码如下，具体实现通过注释表示：

package com.apache.common.cli.demo;

import java.util.List;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.commons.cli.PosixParser;

import com.Utils;

public class ApaCliDemo {
public static void main(String[] args) throws Exception {
//1。访问参数必须加-,如果不加则认为是前一参数的value,也可以写在一起，用空格隔开
//2.参数不能有空格，否则commandLine.getOptionValue(name.trim())获取不到值，commandLine.getArgList()则能获取到值（原因没有仔细看）
String arg[] = { "-h", "-s", "-r","nameOne nameTwo", "-start" ,"-x", "helloWord"};
//		String arg[] = { "-h", "-s", "-r nameOne nameTwo", "-start" ,"-x", "helloWord"};
testOptions(arg);
}

public static void testOptions(String[] args) throws ParseException {
// CLI定义
Options option = new Options();
option.addOption("h","help", false, "this is help");
option.addOption("start","start-all", false, "this app is start ....");
option.addOption("stop","stop-all", false, "this app is stop ....");
option.addOption("s", "stop-all", false, "this app is stop ....");
option.addOption("r", "run", true, "this app is stop ....");
option.addOption("x", "rsn", true, "this app is stop ....");
// CLI的解析
CommandLineParser parser = new PosixParser();
CommandLine commandLine = null;

HelpFormatter hf = new HelpFormatter();
hf.setWidth(110);
try {
commandLine = parser.parse(option, args);
} catch (Exception e) {
hf.printHelp("test", option, true);
System.err.println(e.getLocalizedMessage());
return;
}

// CLI询问
if (commandLine.hasOption("h")) {
List<?> list = commandLine.getArgList();
args = commandLine.getArgs();
Utils.printList(list);
System.out.println("h execte...");

}
// 打印opts的名称和值
System.out.println("--------------------------------------");
Option[] opts = commandLine.getOptions();
if (opts != null) {
for (Option opt1 : opts) {
String name = opt1.getOpt();
String value = commandLine.getOptionValue(name.trim());
System.out.println(name + "=>" + value);
}
}
System.out.println("--------------------------------------");

}
}