我用mysql的driver连接mysql,写了如下的一段代码：
import java.sql.*;

 public class LoadDriver{
      public static void main(String[] Args){
      
             try {
                    
                 Class.forName("org.gjt.mm.mysql.Driver").newInstance();
                 System.out.println("yes load it!"); 
              }
                catch (Exception E) {
                    System.err.println("Unable to load driver.");
                    E.printStackTrace();
                }
             try{
             Connection sqlConn;
         sqlConn=DriverManager.getConnection("jdbc:mysql://localhost/bbs?user=root&password=banyi;useUnicode=true");
             }
             catch(Exception e){
              System.err.println("can't connect!");
              e.printStackTrace();
              }   
              }
           }
运行后：
yes load it!
java.lang.ArrayIndexOutOfBoundsException
        at org.gjt.mm.mysql.Buffer.writeString(Buffer.java:318)
        at org.gjt.mm.mysql.MysqlIO.init(MysqlIO.java:252)
        at org.gjt.mm.mysql.Connection.(Connection.java:230)
        at org.gjt.mm.mysql.Driver.connect(Driver.java:126)
        at java.sql.DriverManager.getConnection(DriverManager.java:517)
        at java.sql.DriverManager.getConnection(DriverManager.java:199)
        at LoadDriver.main(LoadDriver.java:29)
can't connect!
java.sql.SQLException: Cannot connect to MySQL server on localhost:3306. Is ther
e a MySQL server running on the machine/port you are trying to connect to? (java
.lang.ArrayIndexOutOfBoundsException)
        at org.gjt.mm.mysql.Connection.(Connection.java:239)
        at org.gjt.mm.mysql.Driver.connect(Driver.java:126)
        at java.sql.DriverManager.getConnection(DriverManager.java:517)
        at java.sql.DriverManager.getConnection(DriverManager.java:199)
        at LoadDriver.main(LoadDriver.java:29)
这是为什么？

jdbc:mysql://[hostname][:port]/dbname[?param1=value1][=value2]...
      ...

            try {
                Connection C = DriverManager.getConnection(
                  "jdbc:mysql://localhost/test?user=monty=greatsqldb");
                
                // Do something with the Connection
                
                ....
            }
            catch (SQLException E) {
              System.out.println("SQLException: " + E.getMessage());
              System.out.println("SQLState:     " + E.getSQLState());
              System.out.println("VendorError:  " + E.getErrorCode());
            }