opt.addOption("p", false, "no error if existing, " +
"make parent directories as needed.");
opt.addOption("v", "verbose", false, "explain what is being done.");
opt.addOption(OptionBuilder.withArgName("file")
.hasArg()
.withDescription("search for buildfile towards the root of the filesystem and use it")
.create("O"));
opt.addOption(OptionBuilder.withLongOpt("block-size")
.withDescription("use SIZE-byte blocks")
.withValueSeparator('=')
.hasArg()
.create() );
opt.addOption("h", "help", false, "print help for the command.");
String formatstr = "gmkdir [-p][-v/--verbose][--block-size][-h/--help] DirectoryName";
HelpFormatter formatter = new HelpFormatter();
CommandLineParser parser = new PosixParser();
CommandLine cl = null;
try {
// 处理Options和参数
cl = parser.parse( opt, args );
} catch (ParseException e) {
formatter.printHelp( formatstr, opt ); // 如果发生异常，则打印出帮助信息
}
// 如果包含有-h或--help，则打印出帮助信息
if (cl.hasOption("h")) {
HelpFormatter hf = new HelpFormatter();
hf.printHelp(formatstr, "", opt, "");
return;
}
// 判断是否有-p参数
if (cl.hasOption("p")) {
System.out.println("has p");
}
// 判断是否有-v或--verbose参数
if (cl.hasOption("v")) {
System.out.println("has v");
}
// 获取参数值，这里主要是DirectoryName
String[] str = cl.getArgs();
int length = str.length;
System.out.println("length="+length);
System.out.println("Str[0]="+str[0]);
//判断是否含有block-size参数
if( cl.hasOption( "block-size" ) ) {
// print the value of block-size
System.out.println("block-size=" + cl.getOptionValue("block-size"));
}
}
}