在Java中解析命令行参数的好方法是什么?
当前回答
最近有人向我推荐了基于注释的args4j。我真的很喜欢!
其他回答
是的。
我想你在寻找这样的东西: http://commons.apache.org/cli
Apache Commons CLI库提供了一个用于处理命令行接口的API。
这是谷歌的命令行解析库,作为Bazel项目的一部分是开源的。我个人认为它是最好的,比Apache CLI简单得多。
https://github.com/pcj/google-options
安装
Bazel
maven_jar(
name = "com_github_pcj_google_options",
artifact = "com.github.pcj:google-options:jar:1.0.0",
sha1 = "85d54fe6771e5ff0d54827b0a3315c3e12fdd0c7",
)
Gradle
dependencies {
compile 'com.github.pcj:google-options:1.0.0'
}
Maven
<dependency>
<groupId>com.github.pcj</groupId>
<artifactId>google-options</artifactId>
<version>1.0.0</version>
</dependency>
使用
创建一个扩展OptionsBase并定义@Option(s)的类。
package example;
import com.google.devtools.common.options.Option;
import com.google.devtools.common.options.OptionsBase;
import java.util.List;
/**
* Command-line options definition for example server.
*/
public class ServerOptions extends OptionsBase {
@Option(
name = "help",
abbrev = 'h',
help = "Prints usage info.",
defaultValue = "true"
)
public boolean help;
@Option(
name = "host",
abbrev = 'o',
help = "The server host.",
category = "startup",
defaultValue = ""
)
public String host;
@Option(
name = "port",
abbrev = 'p',
help = "The server port.",
category = "startup",
defaultValue = "8080"
)
public int port;
@Option(
name = "dir",
abbrev = 'd',
help = "Name of directory to serve static files.",
category = "startup",
allowMultiple = true,
defaultValue = ""
)
public List<String> dirs;
}
解析参数并使用它们。
package example;
import com.google.devtools.common.options.OptionsParser;
import java.util.Collections;
public class Server {
public static void main(String[] args) {
OptionsParser parser = OptionsParser.newOptionsParser(ServerOptions.class);
parser.parseAndExitUponError(args);
ServerOptions options = parser.getOptions(ServerOptions.class);
if (options.host.isEmpty() || options.port < 0 || options.dirs.isEmpty()) {
printUsage(parser);
return;
}
System.out.format("Starting server at %s:%d...\n", options.host, options.port);
for (String dirname : options.dirs) {
System.out.format("\\--> Serving static files at <%s>\n", dirname);
}
}
private static void printUsage(OptionsParser parser) {
System.out.println("Usage: java -jar server.jar OPTIONS");
System.out.println(parser.describeOptions(Collections.<String, String>emptyMap(),
OptionsParser.HelpVerbosity.LONG));
}
}
https://github.com/pcj/google-options
我使用过JOpt,发现它非常方便:http://jopt-simple.sourceforge.net/
首页还提供了一个大约8个备选库的列表,检查它们并选择最适合您的需求。
我想向您展示我的实现:ReadyCLI
优点:
for lazy programmers: a very small number of classes to learn, just see the two small examples on the README in the repository and you are already at 90% of learning; just start coding your CLI/Parser without any other knowledge; ReadyCLI allows coding CLIs in the most natural way; it is designed with Developer Experience in mind; it largely uses the Builder design pattern and functional interfaces for Lambda Expressions, to allow a very quick coding; it supports Options, Flags and Sub-Commands; it allows to parse arguments from command-line and to build more complex and interactive CLIs; a CLI can be started on Standard I/O just as easily as on any other I/O interface, such as sockets; it gives great support for documentation of commands.
我开发这个项目是因为我需要新的功能(选项,标志,子命令),并且可以在我的项目中以最简单的方式使用。
看一看最近的JCommander。
我创造了它。我很高兴收到问题或功能请求。
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