How to implement dwr in php

In Web development, DWR (Data Web Remoting) is an excellent technology. It is a technology that uses AJAX technology to achieve direct communication between Web applications and server-side Java objects.

However, using DWR technology in PHP is not so straightforward. Although PHP is a very popular and easy-to-learn server-side dynamic language, implementing DWR requires Java. If we don't want to use Java, but use PHP to implement DWR, we need to use other technologies to complete it.

This article will discuss how to implement DWR in PHP and provide some useful tips and methods.

1. Basic knowledge of DWR

DWR is a technology that uses AJAX technology to achieve direct communication between Web applications and server-side Java objects. DWR supports some common data formats, such as JSON, XML, JavaScript, etc., to realize data transmission and parsing. In addition, DWR can easily implement remote calls of a variety of Java objects, including JavaBeans, POJOs, and Spring Beans.

2. How to use PHP to implement DWR

First of all, if you want to use PHP to implement DWR, you need a Java library, which contains some Java classes and methods for Interact data with PHP. The name of the library is dwr.jar. You can download it from the DWR official website.

Then, you need to use a PHP script to handle the request from the Java library. In fact, PHP needs to be in the Java library as a Servlet to handle the request, process the information, and send the results back to the Java library.

To do this, we need to use Java Bridge technology to map PHP to the Java Servlet container. Java Bridge is a Java Servlet container running on the web server, which can interpret PHP scripts as Java Servlets and process these scripts by Java Bridge.

The following is a sample PHP script that demonstrates how to use Java Bridge to use PHP as a Java Servlet to handle requests:

<?php
  // Include JavaBridge library
  require_once( "JavaBridge/java/Java.inc" ); 

  // Create JavaBridge
  $bridge = new JavaBridge();

  // Create DWR class
  $dwr = new Java("com.example.dwr");

  // Call method
  $result = $dwr->process($_REQUEST);

  // Output result
  echo json_encode( $result );
?>

In the above PHP script, first we introduced the JavaBridge library. Then a JavaBridge object is created to handle the request. Then we created a DWR class and passed the received request to the process() method in the class.

Then, we use PHP’s json_encode() function to output the processed results in JSON format.

3. Summary

To implement DWR in PHP, you need to use Java library and Java Bridge technology. Although it seems a bit complicated, it is not difficult to implement after understanding the basic principles.

The above method only provides an idea. In actual operation, more debugging and improvements need to be made to adapt to different project needs.

Finally, I hope this article can provide some help to PHP programmers in implementing DWR.

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