blocks|key|3848985|text|CLI不支持默认值。任何未设置的选项都会导致getOptionValue返回null。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3848986|您可以使用Option.setType方法指定选项类型，并使用CommandLine.getParsedOptionValue提取解析后的选项值作为该类型|3848987|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/cli/api-1.2/org/apache/commons/cli/Option.html#setType%2528java.lang.Object%2529|1|http://commons.apache.org/cli/api-1.2/org/apache/commons/cli/CommandLine.html#getParsedOptionValue%2528java.lang.String%2529^0|M|E|12|4|0|5|E|0|V|W|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]|$9|U|A|V|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|W|8|@]|D|@$9|X|A|Y|1|Z]|$9|10|A|11|1|12]]|E|$]]|$1|H|3|-4|5|6|7|13|8|@]|D|@]|E|$]]]|I|$J|$5|K|L|M|E|$N|O]]|P|$5|K|L|M|E|$N|Q]]]]

CLI does not support default values. Any unset option results in <code>getOptionValue</code> returning <code>null</code>.

You can specify option types using the <a href="http://commons.apache.org/cli/api-1.2/org/apache/commons/cli/Option.html#setType%28java.lang.Object%29" rel="nofollow">Option.setType</a> method and extract the parsed option value as that type using <a href="http://commons.apache.org/cli/api-1.2/org/apache/commons/cli/CommandLine.html#getParsedOptionValue%28java.lang.String%29" rel="nofollow">CommandLine.getParsedOptionValue</a>

blocks|key|1777019|text|编辑:现在支持默认值。请参阅下面的answer++。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|1777020|正如Brent+Worden已经提到的，不支持默认值。|1777021|我在使用Option.setType时也遇到了一些问题。在类型为Integer.class的选项上调用getParsedOptionValue时，我总是得到一个空指针异常。因为文档并没有真正的帮助，所以我查看了源代码。|CODE|1777022|查看TypeHandler类和PatternOptionBuilder类，您可以看到Number.class必须用于int或Integer。|1777023|下面是一个简单的例子：|1777024|CommandLineParser+cmdLineParser+=+new+PosixParser();

Options+options+=+new+Options();
options.addOption(OptionBuilder.withLongOpt("integer-option")
++++++++++++++++++++++.withDescription("description")
++++++++++++++++++++++.withType(Number.class)
++++++++++++++++++++++.hasArg()
++++++++++++++++++++++.withArgName("argname")
++++++++++++++++++++++.create());

try+{
++++CommandLine+cmdLine+=+cmdLineParser.parse(options,+args);

++++int+value+=+0;+//+initialize+to+some+meaningful+default+value
++++if+(cmdLine.hasOption("integer-option"))+{
++++++++value+=+((Number)cmdLine.getParsedOptionValue("integer-option")).intValue();
++++}

++++System.out.println(value);
}+catch+(ParseException+e)+{
++++e.printStackTrace();
}|code-block|syntax|javascript|1777025|请记住，如果提供的数字不适合int，则value可能会溢出。|1777026|entityMap|0|LINK|mutability|MUTABLE|url|http://svn.apache.org/viewvc/commons/proper/cli/trunk/src/main/java/org/apache/commons/cli/TypeHandler.java?view=markup|1|http://svn.apache.org/viewvc/commons/proper/cli/trunk/src/main/java/org/apache/commons/cli/PatternOptionBuilder.java?view=markup^0|0|N|P|1|0|0|4|E|W|D|1F|K|0|16|C|1M|3|1Q|7|2|B|0|F|K|1|0|0|0|E|3|J|5|0^^$0|@$1|2|3|4|5|6|7|15|8|@$9|16|A|17|B|C]|$9|18|A|19|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1A|8|@]|D|@]|E|$]]|$1|H|3|I|5|6|7|1B|8|@$9|1C|A|1D|B|J]|$9|1E|A|1F|B|J]|$9|1G|A|1H|B|J]]|D|@]|E|$]]|$1|K|3|L|5|6|7|1I|8|@$9|1J|A|1K|B|J]|$9|1L|A|1M|B|J]|$9|1N|A|1O|B|J]]|D|@$9|1P|A|1Q|1|1R]|$9|1S|A|1T|1|1U]]|E|$]]|$1|M|3|N|5|6|7|1V|8|@]|D|@]|E|$]]|$1|O|3|P|5|Q|7|1W|8|@]|D|@]|E|$R|S]]|$1|T|3|U|5|6|7|1X|8|@$9|1Y|A|1Z|B|J]|$9|20|A|21|B|J]]|D|@]|E|$]]|$1|V|3|-4|5|6|7|22|8|@]|D|@]|E|$]]]|W|$X|$5|Y|Z|10|E|$11|12]]|13|$5|Y|Z|10|E|$11|14]]]]

EDIT: Default values are now supported. See answer <a href="https://stackoverflow.com/a/14309108/1082541">https://stackoverflow.com/a/14309108/1082541</a> below.

As Brent Worden already mentioned, default values are not supported.

I had issues with using <code>Option.setType</code> too. I always got a null pointer exception when calling <code>getParsedOptionValue</code> on an option with type <code>Integer.class</code>. Because the documentation was not really helpful I looked into the source code.

Looking at the <a href="http://svn.apache.org/viewvc/commons/proper/cli/trunk/src/main/java/org/apache/commons/cli/TypeHandler.java?view=markup" rel="noreferrer">TypeHandler</a> class and the <a href="http://svn.apache.org/viewvc/commons/proper/cli/trunk/src/main/java/org/apache/commons/cli/PatternOptionBuilder.java?view=markup" rel="noreferrer">PatternOptionBuilder</a> class you can see that <code>Number.class</code> must be used for <code>int</code> or <code>Integer</code>.

And here is a simple example:

<pre class="lang-java prettyprint-override"><code>CommandLineParser cmdLineParser = new PosixParser();

Options options = new Options();
options.addOption(OptionBuilder.withLongOpt("integer-option")
 .withDescription("description")
 .withType(Number.class)
 .hasArg()
 .withArgName("argname")
 .create());

try {
 CommandLine cmdLine = cmdLineParser.parse(options, args);

 int value = 0; // initialize to some meaningful default value
 if (cmdLine.hasOption("integer-option")) {
 value = ((Number)cmdLine.getParsedOptionValue("integer-option")).intValue();
 }

 System.out.println(value);
} catch (ParseException e) {
 e.printStackTrace();
}
</code></pre>

Keep in mind that <code>value</code> can overflow if a number is provided which does not fit into an <code>int</code>.

blocks|key|2239125|text|我不知道是不是不工作，或者是最近添加的，但getOptionValue()+有，这是一个接受默认值(字符串)的重载版本|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|2239126|entityMap|0|LINK|mutability|MUTABLE|url|http://commons.apache.org/proper/commons-cli/apidocs/org/apache/commons/cli/CommandLine.html#getOptionValue%2528java.lang.String,%2520java.lang.String%2529^0|12|1|L|G|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@$9|O|A|P|B|C]]|D|@$9|Q|A|R|1|S]]|E|$]]|$1|F|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|G|$H|$5|I|J|K|E|$L|M]]]]

I do not know if not working or if added recently but <a href="http://commons.apache.org/proper/commons-cli/apidocs/org/apache/commons/cli/CommandLine.html#getOptionValue%28java.lang.String,%20java.lang.String%29">getOptionValue()</a> has an overloaded version that accepts a default (String) value

blocks|key|3849099|text|在1.3+&+1.4版本中，OptionBuilder已被弃用，并且Option.Builder似乎没有直接的函数来设置类型。Option类有一个名为setType的函数。您可以使用函数CommandLine.getParsedOptionValue检索转换后的值。不确定为什么它不再是构建器的一部分。现在它需要一些类似下面这样的代码：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3849100|++++options+=+new+Options();

++++Option+minOpt+=+Option.builder("min").hasArg().build();
++++minOpt.setType(Number.class);
++++options.addOption(minOpt);|code-block|syntax|javascript|3849101|读着它：|3849102|++++String+testInput+=+"-min+14";
++++String[]+splitInput+=+testInput.split("\\s%2B");

++++CommandLine+cmd+=++CLparser.parse(options,+splitInput);
++++System.out.println(cmd.getParsedOptionValue("min"));+|3849103|它会给出一个Long类型的变量|3849104|entityMap^0|Y|E|1R|6|23|7|2L|W|0|0|0|0|6|4|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@]|E|$]]|$1|M|3|N|5|H|7|13|8|@]|D|@]|E|$I|J]]|$1|O|3|P|5|6|7|14|8|@$9|15|A|16|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|17|8|@]|D|@]|E|$]]]|R|$]]

The OptionBuilder is deprecated in version 1.3 &amp; 1.4 and <code>Option.Builder</code> doesn't seem to have a direct function to set the type. There is a function for the <code>Option</code> class called <code>setType</code>. You can a retrieve a converted value with the function <code>CommandLine.getParsedOptionValue</code>.
Not sure why it's not part of the builder anymore. It requires some code like this now:

<pre><code> options = new Options();

 Option minOpt = Option.builder("min").hasArg().build();
 minOpt.setType(Number.class);
 options.addOption(minOpt);
</code></pre>

and reading it:

<pre><code> String testInput = "-min 14";
 String[] splitInput = testInput.split("\\s+");

 CommandLine cmd = CLparser.parse(options, splitInput);
 System.out.println(cmd.getParsedOptionValue("min")); 
</code></pre>

which would give a variable of type <code>Long</code>

blocks|key|158752|text|可以使用另一种定义|type|unstyled|depth|inlineStyleRanges|entityRanges|data|158753|getOptionValue:
public+String+getOptionValue(String+opt,+String+defaultValue)|code-block|syntax|javascript|158754|并将您的默认值包装为string。|158755|示例：|158756|String+checkbox+=+line.getOptionValue("cb",+String.valueOf(false));|158757|输出:+false|158758|这对我很管用|158759|entityMap^0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|V|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|W|8|@]|9|@]|A|$E|F]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

One can use other definition of 

<pre><code>getOptionValue:
public String getOptionValue(String opt, String defaultValue)
</code></pre>

and wrap your default value to string.

Example:

<pre><code>String checkbox = line.getOptionValue("cb", String.valueOf(false));
</code></pre>

output: false

it worked for me

How can I give a CLI Option a type - such as <code>int</code> or <code>Integer</code>? (Later, how can I get the parsed value with a single function call?)

How can I give a CLI Option a default value? Such that <code>CommandLine.getOptionValue()</code> or the function call mentioned above return that value unless one is specified on the command line?

Apache Commons CLI - option type and default value

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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如何为命令行界面选项指定类型-如int或Integer？(稍后，如何通过单个函数调用获得解析后的值？)如何为CLI选项提供默认值？以便CommandLine.getOptionValue()或上面提到的函数调用返回该值，除非在命令行中指定了该值？

问Apache Commons CLI -选项类型和默认值
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