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

Next: An Exceptionally Clever Cow >>
 

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