Java(TM) Boutique - PHP and Java: Powerful Forces Combined

Tutorials :PHP and Java: Powerful Forces Combined :

Java Classes in PHP Scripts: An Example

Now, that you know the PHP/Java Bridge basics, it's time to develop your first PHP/Java application. The example application is a PHP script that implements a hand-calculator with the four basic operations (+,-,* and, /). Java will be the �engine� of the application, because the results of calculations will be provided by a Java class named CalculatorBean. In other words, PHP will pass the operands to dedicated Java methods and will receive the calculation results, displaying them to the user.

The CalculatorBean class defines four methods for operators and one method for returning the result. The source code is shown in Listing 1.

After you compile this Java source, place it in a .jar archive named calculator.jar. Copy this file to the appName/WEB-INF/lib directory.

Now it's time to develop the PHP script that will call the above Java class. Using the methods described in the �Use Java classes in PHP scripts� section, you can write the calculator.php as shown in Listing 2.

Place the calculator.php script in the appName directory. Now, if you test this application under Tomcat application server (localhost, 8080), you should be able to see the result by going to the following URL: http://localhost:8080/appName/calculator.php. The result is shown in Figure 1.

PHP Scripts in JSP Pages: An Example

Suppose you want to call PHP's rand method to obtain a random number between zero and a maximum value. To do this, you'd use ScriptEngine as shown below:

<%
  javax.script.ScriptEngine e = 
  php.java.script.EngineFactory.getInvocablePhpScriptEngine 
(this, application, request, response);
  e.getContext().setWriter(out);

  e.eval ("<?php function randomNumber($maxim) { return rand(0,java_values($maxim)); }; ?>");

  javax.script.Invocable i = (javax.script.Invocable) e;

  Object result = null;
  result = i.invokeFunction("randomNumber", new Object[]{new Integer(100)});

  e.eval ((java.io.Reader)null); // flush the output generated by invokeXXX

  out.println("Random number printed from the servlet: " + result);
%>

Testing this example under Tomcat on localhost, 8080 using http://localhost:8080/appName/random.jsp, a possible result is shown in Figure 2.

Home / Articles / PHP and Java: Powerful Forces Combined / 1 / 2 / 3 /

Next: PHP scripts in Java Desktop Applications

Applet Index
(sorted alphabetically)
A B C D E F G H I J K
L M N O P Q R S T U
V W X Y Z #s

The Java Source
(applets w/source code)
A B C D E F G H I J K
L M N O P Q R S T U
V W X Y Z

How to Add Java Applets to Your Site

New on the Java Boutique:

New Review:

Time Management Made Easy with the Quartz Enterprise Job Scheduler
Why not just use the Java timer API? This open source scheduling API boasts simplicity, ease-of-integration, a well-rounded feature set, and it's free!

New Applet:

Reverse Complement
Reverse Complement is a simple applet that converts DNA or RNA sequences into three useful formats.