为什么 总是 java.sql.SQLException: No suitable driver found for jdbc:Cache://localhost:1972/SAMPLES

import java.sql.Connection;

import java.sql.Driver;

import java.sql.DriverManager;

import java.sql.SQLException;



public class GetConnection {

public static Connection GetConn(String JarName,String ClassName,String ConnectString,String UserName ,String PassWord){

	Connection conn = null;

	Class c = null;

	Object o = null;

	try {

		System.out.println(JarName);

		JarClassLoader jarLoader = new JarClassLoader (JarName);

        /* Load the class from the jar file and resolve it. */

        c = jarLoader.loadClass (ClassName, true);

        try {

			o = c.newInstance();

		} catch (InstantiationException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} catch (IllegalAccessException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		Class.forName(ClassName, true, c.getClassLoader());

	} catch (ClassNotFoundException e) {

		// TODO Auto-generated catch block

		e.printStackTrace();

	}

	try 

	{

		Driver dr = (Driver)o;

		DriverManager.registerDriver(dr);

		System.out.println( dr.getClass().toString());

		System.out.println( dr.jdbcCompliant() );

		System.out.println( "UserName : " + UserName);

		System.out.println( "PassWord : " + PassWord);

		conn = DriverManager.getConnection( ConnectString,UserName,PassWord); 

	} 

	catch (SQLException  ex) 

	{ 

		ex.printStackTrace();

	} 



	if (conn!=null) 

		return conn;

	else 

		return null;



	

	}

public static void main(String [] args){

	GetConn("c:/CacheDB.jar","com.intersys.jdbc.CacheDriver" , "jdbc:Cache://localhost:1972/SAMPLES","_system","sys");

}

}

public class JarClassLoader extends MultiClassLoader {

	private JarResources jarResources;



	public JarClassLoader(String jarName) {

		// Create the JarResource and suck in the jar file.

		jarResources = new JarResources(jarName);

	}



	protected byte[] loadClassBytes(String className) {

		// Support the MultiClassLoader's class name munging facility.

		className = formatClassName(className);

		// Attempt to get the class data from the JarResource.

		return (jarResources.getResource(className));

	}

}

import java.io.*;

import java.util.*;

import java.util.zip.*;



/**

 * JarResources: JarResources maps all resources included in a

 * Zip or Jar file. Additionaly, it provides a method to extract one

 * as a blob.

 */

public final class JarResources

    {



    // external debug flag

    public boolean debugOn=false;



    // jar resource mapping tables

    private Hashtable htSizes=new Hashtable();  

    private Hashtable htJarContents=new Hashtable();



    // a jar file

    private String jarFileName;



    /**

      * creates a JarResources. It extracts all resources from a Jar

      * into an internal hashtable, keyed by resource names.

      * @param jarFileName a jar or zip file

      */

    public JarResources(String jarFileName)

	{

	this.jarFileName=jarFileName;

	init();

	}



    /**

      * Extracts a jar resource as a blob.

      * @param name a resource name.

      */

    public byte[] getResource(String name)

	{

	return (byte[])htJarContents.get(name);

	}



    /** initializes internal hash tables with Jar file resources.  */

    private void init()

	{

	try

	    {

	    // extracts just sizes only. 

	    ZipFile zf=new ZipFile(jarFileName);

	    Enumeration e=zf.entries();

	    while (e.hasMoreElements())

		{

		ZipEntry ze=(ZipEntry)e.nextElement();



		if (debugOn)

		    {

		    System.out.println(dumpZipEntry(ze));

		    }



		htSizes.put(ze.getName(),new Integer((int)ze.getSize()));

		}

	    zf.close();



	    // extract resources and put them into the hashtable.

	    FileInputStream fis=new FileInputStream(jarFileName);

	    BufferedInputStream bis=new BufferedInputStream(fis);

	    ZipInputStream zis=new ZipInputStream(bis);

	    ZipEntry ze=null;

	    while ((ze=zis.getNextEntry())!=null)

		{

		if (ze.isDirectory())

		    {

		    continue;

		    }



		if (debugOn)

		    {

		    System.out.println("ze.getName()="+ze.getName()+

				       ","+"getSize()="+ze.getSize() );

		    }



		int size=(int)ze.getSize();

		// -1 means unknown size.

		if (size==-1)

		    {

		    size=((Integer)htSizes.get(ze.getName())).intValue();

		    }



		byte[] b=new byte[(int)size];

		int rb=0;

		int chunk=0;

		while (((int)size - rb) > 0)

		    {

		    chunk=zis.read(b,rb,(int)size - rb);

		    if (chunk==-1)

			{

			break;

			}

		    rb+=chunk;

		    }



		// add to internal resource hashtable

		htJarContents.put(ze.getName(),b);



		if (debugOn)

		    {

		    System.out.println( ze.getName()+"  rb="+rb+

					",size="+size+

					",csize="+ze.getCompressedSize() );

		    }

		}

	    }

	catch (NullPointerException e)

		{

		System.out.println("done.");

		}

	catch (FileNotFoundException e)

	    {

	    e.printStackTrace();

	    }

	catch (IOException e)

	    {

	    e.printStackTrace();

	    }

	}



    /**

      * Dumps a zip entry into a string.

      * @param ze a ZipEntry

      */

    private String dumpZipEntry(ZipEntry ze)

	{

	StringBuffer sb=new StringBuffer();

	if (ze.isDirectory())

	    {

	    sb.append("d ");

	    }

	else

	    {

	    sb.append("f ");

	    }



	if (ze.getMethod()==ZipEntry.STORED)

	    {

	    sb.append("stored   ");

	    }

	else

	    {

	    sb.append("defalted ");

	    }



	sb.append(ze.getName());

	sb.append("\t");

	sb.append(""+ze.getSize());

	if (ze.getMethod()==ZipEntry.DEFLATED)

	    {

	    sb.append("/"+ze.getCompressedSize());

	    }



	return (sb.toString());

	}



    }	// End of JarResources class.