Java Main参数解析(Args4j)

最近实现一个工具，Main函数会有很多参数，而且参数类型不同，为了统一解析，网上找到三方工具类Args4j，轻松搞定。

代码实例如下：

定义解析类：

        
import java.io.File
import org.kohsuke.args4j.Option
import org.slf4j.LoggerFactory

/**
  * 数据库报表生成命令行参数定义
  *
  * @author BarryWang create at 2018/6/23 20:21
  * @version 0.0.1
  */
class ArgOptions {
  val logger= LoggerFactory.getLogger(classOf[ArgOptions])
  /**
    * 对象名及查询SQL脚本对，中间用英文分号":"隔开
    */
  val query = new scala.collection.mutable.ListBuffer[(String, String, String)];
  @Option(name = "-q",
          aliases = Array("-query"),
          metaVar = "<db>:<objectName>:<sql>",
          usage = "对象名及查询SQL脚本对，中间用英文分号“:”隔开, 例如database:objectName:sql。（String）")
  def setProperty(property: String): Unit = {
    var arr = property.split(":")
    arr.length match {
      case 3 => query.+=((arr(0), arr(1), arr(2)))
      case _ => logger.info("-query 传入参数格式错误, 正确格式: <db>:<objectName>:<sql>")
    }
  }
  /**
    * JXLS Excel模板文件绝对路径
    */
  @Option(name = "-t",
          aliases = Array("-template"),
          metaVar = "<template file>",
          usage = "JXLS Excel模板文件绝对路径， 请参考：http://jxls.sourceforge.net/reference/simple_exporter.html。(File)" )
  var template: File = null
  /**
    * Scala脚本文件
    */
  @Option(name = "-s",
          aliases = Array("-script"),
          metaVar = "<scala script file path>",
          usage = "Scala脚本文件， 请参考：http://ammonite.io/#ScalaScripts。(String)")
  var script: String = null
  /**
    * 输出Excel文件
    */
  @Option(name = "-o",
          aliases = Array("-output"),
    /* required = true,handler = classOf[StringArrayOptionHandler],*/
          metaVar = "<output excel file>",
          usage = "输出Excel文件绝对路径。(File)")
  var output: String = null
  /**
    * 输出Excel文件
    */
  @Option(name = "-m",
    aliases = Array("-mailto"),
    metaVar = "<email>",
    usage = "生成报表发送邮箱，多个使用英文分号“;”分割。(String)")
  var email: String = null

  /**
    * 邮件主题
    */
  @Option(name = "-sub",
    aliases = Array("-subject"),
    metaVar = "<subject>",
    usage = "邮件主题。(String)")
  var subject: String = null
}
引用解析类如下：
import java.io.File

import java.util.Date
import com.today.dbreport.action.impl.{GenReportByScriptAction, GenReportBySqlAction, GenReportByTemplateBySqlAction}
import com.today.dbreport.dto.GenReportParam
import com.today.dbreport.utils.EmailUtil
import com.today.service.commons.util.DateTools
import org.kohsuke.args4j.CmdLineParser
import org.slf4j.LoggerFactory
import scala.collection.JavaConverters._
/**
  * 生成报表入口
  *
  * @author BarryWang create at 2018/6/1 11:02
  * @version 0.0.1
  */
object Main {
  val logger= LoggerFactory.getLogger(Main.getClass)
  def main(args: Array[String]): Unit = {
    val options = new ArgOptions
    val parser = new CmdLineParser(options)
    // print usage
    parser.printUsage(System.out)
    parser.parseArgument(args.toList.asJava)
    //输出文件或发送邮件必填一个
    if(options.output == null && options.email == null){
      println("请传入参数-output 或 -mailto其中之一")
      return
    }
    //生成报表地址
    var utf8Output = ""
    if (options.output != null) {
        utf8Output = new String(options.output.getBytes("UTF-8"), "UTF-8")
    } else {//本地临时文件
      val currentTime = DateTools.format(new Date(), "yyyyMMddHHmmssSSS")
      val outDir = s"${System.getProperty("user.dir")}${File.separator}output"
      var outputDir = new File(outDir)
      if(!outputDir.exists()){
        outputDir.mkdirs()
      }
      utf8Output = s"${outDir}${File.separator}${currentTime}.xlsx"
    }
    //带有Scala脚本
    if (options.script != null) {
      var templateOptional: Option[File] = None
      if (options.template != null) {
        templateOptional = Some(options.template)
      }
      val scriptOptional = Some(options.script)
      var mailtoOptional: Option[String] = None
      if (options.email != null) {
        mailtoOptional = Some(options.email)
      }
      val genReportParam = new GenReportParam(options.query, utf8Output, templateOptional, scriptOptional, mailtoOptional)
      //sql + script + jxls template
      //script + jxls tempalte
      new GenReportByScriptAction(genReportParam).execute
    } else {//无Scala脚本
      var templateOptional: Option[File] = None
      if (options.template != null){
        templateOptional = Some(options.template)
      }
      var scriptOptional : Option[String] = None
      if(options.script != null){
        scriptOptional = Some(options.script)
      }
      var mailtoOptional: Option[String] = None
      if (options.email != null){
        mailtoOptional = Some(options.email)
      }
      val genReportParam = new GenReportParam(options.query, utf8Output, templateOptional, scriptOptional, mailtoOptional)
      if (options.template != null) { //sql* + jxls template
        new GenReportByTemplateBySqlAction(genReportParam).execute
      } else { //no template + sql
        new GenReportBySqlAction(genReportParam).execute
      }
    }
    println(s"报表生成成功${utf8Output}！")
    //发送邮件
    if (options.email != null) {
      var subject = "报表工具生成报表"
      if(options.subject != null){
        subject = options.subject
      }
      EmailUtil.sendEmail(options.email.trim, subject, "生成报表请参考附件", utf8Output)
      println("邮件发送成功，请邮件附件下载相关报表！")
      //邮件发送成功， 删除本地临时文件
      if (options.output == null) {
        new File(utf8Output).deleteOnExit()
      }
    }
    logger.info(s"报表生成成功${utf8Output}")
  }
}

原文：https://www.cnblogs.com/barrywxx/p/9976543.html