Using PHP with Java - Passing The Parcel
( Page 5 of 7 )

This next example demonstrates how one object instance can be passed to another in a single PHP script.

Here's the code:

import java.io.Writer;
import java.io.IOException;
import java.lang.Exception;

public class ReverseString 
{
        public Writer out;

        public void setWriter(Writer out) 
	 {
  this.out = out;
        }

        public void reverse(String string) throws Exception 
	 {
  try 
  {
	            	// reverse the string here
  	char tempArray[] = new char[string.length()];

  	for (int i = 0; i < string.length(); i++)
    tempArray[i] =
string.charAt(string.length() - i - 1);
  	String reversedString = new String(tempArray);
  	out.write(reversedString);

  } 
  catch (IOException e) 
  {
                     // catch IO exceptions
                     throw new Exception("Something bad
happened");

  } 
  catch (Exception e) 
  {
                        	// catch everything else
             	           	throw new Exception("Something really
bad happened");
  }

	}
}

This class uses a Writer object for script communication; this Writer object is instantiated via the setWriter() class method.

        	public void setWriter(Writer out) 
  {
  this.out = out;
        	}

Next, the class method reverse() accepts a string, reverses it and returns it via the Writer object.

      	public void reverse(String string) throws Exception 
	{
  try 
  {
	             	// reverse the string here
  	char tempArray[] = new char[string.length()];

  	for (int i = 0; i < string.length(); i++)
    tempArray[i] =
string.charAt(string.length() - i - 1);
  	String reversedString = new String(tempArray);
  	out.write(reversedString);

  // snip
  } 
  

	}

Compile this class, copy it to your Java CLASSPATH, and write a simple PHP script to access it.

<?php

// create an instance of the ReverseString object
$obj = new Java("ReverseString");

// create an instance of the StringWriter object
$writer = new Java("java.io.StringWriter");

$obj->setWriter($writer);
$obj->reverse("The cow jumped over the moon");

echo $writer->toString();
$writer->flush();
$writer->close();

?>

In this case, I've instantiated two objects, one for the ReverseString class and the other for the StringWriter class. Next, I've passed the StringWriter object, as stored in the PHP object $writer, to the ReverseString class via the class' setWriter() method, and then used the reverse() method to reverse a string and return the result.

Here's what the output looks like:

noom eht revo depmuj woc ehT

>>> More PHP Articles          >>> More By Harish Kamath, (c) Melonfire