saludos.

// input a value from a specified port address
public native short Inp32(short PortAddress);

// load ‘jnpout32.dll’
static { System.loadLibrary(“jnpout32″);}
}
/**
*
* @author Carlos Eduardo
*/
public class pPort
{
ioPort pp; // wrapper class for ‘Jnpout32.dll’
// with methods:
// int Out32(int port, int value);
// int Inp32(int port);
short portAddress; // address of data port
short currentVal; // current value of port bits

public pPort()
{
pp = new ioPort();
portAddress = (short)0×378; // Hex Address of Data Byte of PC Parallel Port
setAllDataBits((short)0); // initialize port bits to 0
currentVal = 0×00;
}

// wrap ParallelPort output method
public void output(short port, short value)
{
pp.Out32(port, value);
}

// wrap ParallelPort input method
public short input(short port)
{
return pp.Inp32(port);
}

// output to default Data port
public void output(short value)
{
pp.Out32(portAddress, value);
}

// input from default Data port
public short input()
{
return pp.Inp32(portAddress);
}

/**
* set all bits on Data port to zero
**/
public void setAllDataBits(short value)
{
pp.Out32(portAddress, value);
currentVal = value;
}

// For users who prefer dealing with Pin numbers
// Set Pin to
public void setPin(short pin, short value)
{
if (pin >= 2 && pin <= 9)
// just set the corresponding Data bit to indicted value
setDataBit((short)(pin-2), value);
}

/**
* Set Data Bit at selected index to a value of 1 or 0
* while preserving current values of all other Data bits
**/
void setDataBit(short index, short value)
{
switch(index)
{
case 0:
if (value==0) // Set Data[0] to 0

currentVal = (short) (currentVal & 0xFE);
// aaaa aaaa currentVal
// AND 1111 1110 mask
// =========
// aaaa aaa0 new currentVal

else // Set Data[0] to 1

currentVal = (short) (currentVal | 0×01);
// aaaa aaaa currentVal
// OR 0000 0001 mask
// =========
// aaaa aaa1 new currentVal
break;
case 1:
if (value==0)
currentVal = (short) (currentVal & 0xFD);
// currentVal = aaaa aa0a
else
currentVal = (short) (currentVal | 0×02);
// currentVal = aaaa aa1a
break;
case 2:
if (value==0)
currentVal = (short) (currentVal & 0xFB);
// currentVal = aaaa a0aa
else
currentVal = (short) (currentVal | 0×04);
// currentVal = aaaa a1aa
break;
case 3:
if (value==1)
currentVal = (short) (currentVal & 0xF7);
// currentVal = aaaa 0aaa
else
currentVal = (short) (currentVal | 0×08); // currentVal = aaaa 1aaa
break;
case 4:
if (value==0)
currentVal = (short) (currentVal & 0xEF);
// currentVal = aaa0 aaaa
else
currentVal = (short) (currentVal | 0×10); // currentVal = aaa1 aaaa
break;
case 5:
if (value==0)
currentVal = (short) (currentVal & 0xDF);
// currentVal = aa0a aaaa
else
currentVal = (short) (currentVal | 0×20); // currentVal = aa1a aaaa
break;
case 6:
if (value==0)
currentVal = (short) (currentVal & 0xBF);
// currentVal = a0aa aaaa
else
currentVal = (short) (currentVal | 0×40); // currentVal = a1aa aaaa
break;
case 7:
if (value==0)
currentVal = (short) (currentVal & 0x7F);
// currentVal = 0aaa aaaa
else
currentVal = (short) (currentVal | 0×80); // currentVal = 1aaa aaaa
break;

default:
System.out.println(“index must be 0 – 7″);
}
pp.Out32(portAddress, currentVal);
}

}