用JAVA命令行執行scala程序時的一個小問題

scala訪問MySQL數據庫例子：

import java.sql.{Connection,ResultSet,DriverManager}

import scala.util.control.Exception.Catch

//import java.sql.DriverManager
object DataAnalysisTest {
  def main(args: Array[String]): Unit = {
    if(args.length!=3)
      {
        println("參數錯誤!")
        println("使用方法：DataAnalysisTest 數據庫名  用戶名  密碼")
        return
      }
    //驅動名稱
  val driver = "com.mysql.jdbc.Driver"
  //數據庫名
  var dbdata = args(0)
  //用戶名
  val username = args(1)
  //密碼
  val password = args(2)
  
  val dbc = "jdbc:mysql://localhost:3306/"+dbdata+"?user="+username+"&password="+password
  //初始化數據鏈接
  var connection:Connection =null   
  //
  try
  {
    Class.forName(driver)
    connection = DriverManager.getConnection(dbc) 
    val statement = connection.createStatement()
    val rs = statement.executeQuery("select * from imtesttable ")
    while(rs.next())
    {
      println(rs.getInt("id"))
      println(rs.getInt("f0"))
    }
    
   
    connection.close()
  }
  catch{
    case e:Exception=>e.printStackTrace()
  }
  }  
}

程序在eclipse中執行都很正常。命令行用scala來執行（上面源代碼所在的目錄是C:\Users\joe\eclipse-workspace\HelloScala\）：

C:\Users\joe\eclipse-workspace\HelloScala\bin>scala DataAnalysisTest 數據庫名 用戶名 密碼

程序也能正常執行。如今想用java命令行來執行：

先在此將相關的環境變量顯示給你們看：

C:\Users\joe\eclipse-workspace\HelloScala\bin>echo %SCALA_HOME%
C:\Program Files (x86)\scala

我如今開始在cmd中輸入命令：

C:\Users\joe\eclipse-workspace\HelloScala\bin>java -cp .;"D:/Program Files (x86)
/eclipse-jee-oxygen-3a-win32-x86_64/eclipse/plugins/org.scala-lang.scala-library
.source_2.12.3.v20170725-052526-VFINAL-6ac6da8.jar";D:\software\mysql-connector-
java-5.1.46/mysql-connector-java-5.1.46.jar;%SCALA_HOME%\lib\*  DataAnalysisTest
 dbtest root 123abc
錯誤: 找不到或沒法加載主類 Files

而後我將最後一個scala相關的jar庫放在前面：

C:\Users\joe\eclipse-workspace\HelloScala\bin>java -cp .;"D:/Program Files (x86)
/eclipse-jee-oxygen-3a-win32-x86_64/eclipse/plugins/org.scala-lang.scala-library
.source_2.12.3.v20170725-052526-VFINAL-6ac6da8.jar";"%SCALA_HOME%\lib\*";D:\soft
ware\mysql-connector-java-5.1.46/mysql-connector-java-5.1.46.jar  DataAnalysisTe
st dbtest root 123abc
1
10
2
11

說明成功執行。怎麼會這樣呢？難道xxx\*這樣的jar包含格式不能放在最後面嗎？應該不是這樣的。再作實驗以下：

C:\Users\joe\eclipse-workspace\HelloScala\bin>java -cp .;"D:/Program Files (x86)
/eclipse-jee-oxygen-3a-win32-x86_64/eclipse/plugins/org.scala-lang.scala-library
.source_2.12.3.v20170725-052526-VFINAL-6ac6da8.jar";D:\software\mysql-connector-
java-5.1.46/mysql-connector-java-5.1.46.jar;"%SCALA_HOME%\lib\*"  DataAnalysisTe
st dbtest root 123abc
1
10
2
11

再次說明只是由於沒有加雙引號的緣由。再後來發現第一個jar包是源碼包，根本就不須要：

C:\Users\joe\eclipse-workspace\HelloScala\bin>java -cp .;D:\software\mysql-connector-
java-5.1.46/mysql-connector-java-5.1.46.jar;"%SCALA_HOME%\lib\*"  DataAnalysisTe
st dbtest root 123abc
1
10
2
11

若是將上面的mysql的jar包放在bin目錄下執行以下命令也能夠正確執行：

C:\Users\joe\eclipse-workspace\HelloScala\bin>java -cp .;mysql-connector-java-5.1.46.jar;"%SCALA_HOME%\lib\*"  DataAnalysisTe
st dbtest root 123abc
1
10
2
11

換成下面的命令則不能正確執行：

C:\Users\joe\eclipse-workspace\HelloScala\bin>java -cp .;"%SCALA_HOME%\li
b\*"  DataAnalysisTest dbtest root 123abc
java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:264)
        at DataAnalysisTest$.main(DataAnalysisTest.scala:32)
        at DataAnalysisTest.main(DataAnalysisTest.scala)

換成以下命令則能正確執行：

C:\Users\joe\eclipse-workspace\HelloScala\bin>java -cp .;".\*";"%SCALA_HO
ME%\lib\*"  DataAnalysisTest dbtest root 123abc
1
10
2
11