Programming a PHP/Java Bridge servlet

This guide shows how to create a servlet and how to call it from PHP code.

Create a servlet using the Eclipse IDE

• Start Eclipse Java EE IDE for Web Developers
• Click on File/New/Dynamic Web Project
• Enter Project name: "MyWebApp", Target runtime: "Apache Tomcat v6.0", Configuration: "Default configuration for Apache Tomcat"
• Click on Finish
• Open the tree: Project Explorer/MyWebApp/WebContent/WEB-INF so that the lib directory becomes visible
• Drag and drop JavaBridge.jar and php-servlet.jar to the lib directory.
• Click on File/New/Servlet
• Enter Java package: "test", Class name: "Hello"
• Click Next, Click Next
• Uncheck "doPost", check "doGet" and "doPut"
• Click on Finish
• Add the following code to the doGet method body:

  response.getWriter().write("HelloServlet is running!");

• Add the following code to the doPut method body (press Control-Shift-o to automatically resolve references):

  RemoteHttpServletContextFactory ctx = new RemoteHttpServletContextFactory(this,
  getServletContext(), request, request, response);

response.setHeader("X_JAVABRIDGE_CONTEXT", ctx.getId());
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");

try {
  ctx.handleRequests(request.getInputStream(), response.getOutputStream());
} finally {
  ctx.destroy();
}


• Add the following method to the servlet:

  public String hello() {return "hello from MyServlet";}

• Click on the Run button. In the dialog box click on the Finish button. You should see the browser "http://localhost:8080/MyWebApp/Hello" with the message "HelloServlet is running!".

Connect PHP with your servlet

• Drag and drop Java.inc to a directory and create the following PHP script "test.php":

  <?php
  define("JAVA_HOSTS", "localhost:8080");
  define("JAVA_SERVLET", "/MyWebApp/Hello");
  require_once("Java.inc");

  echo java_context()->getServlet()->hello();
?>


• Run the PHP script. For example with the command:

  php -n test.php


  It will invoke the hello() method and display its result.

Please see the Java API documentation for more information.