Send data from php to java

Question

I have found quite a lot of other posts on this topic but none seem to have the answer I need.
I have written a Bukkit plugin for Minecraft that can send post data to a PHP page and get a return from the page.

Now the one thing I can't figure out. I would like to have a button on the page, and when the button is clicked, send data to the Java plugin and have the plugin print the message.

I have seen something about sockets. But after reading about them I can't figure out how to set them up.
Pretty much at any time you should be able to click the button and it sends data to the Java plugin and I can use that data however I like.

Does anyone know how I can have the Java plugin constantly waiting for data from the page?

My current code:
(This sends the players name to the website.)

String re = "";  
URL url = new URL("address here");  
URLConnection con = url.openConnection();  
con.setDoOutput(true);  
PrintStream ps = new PrintStream(con.getOutputStream());  
ps.print("player=" + player.getName());  
con.getInputStream();  
BufferedReader rd = new BufferedReader(new InputStreamReader(con.getInputStream()));  
String line;  
while ((line = rd.readLine()) != null) {  
   re += line + "\n";  
}  
rd.close();  
ps.close();

And my php just returns any post data it gets.
It works fine, but I would like to listen in my java plugin for data from the php page.

Aron · Accepted Answer · 2014-12-23 09:41:37Z

1

There are many ways to make communication between two servers. I'd use one of them:

Sockets
JMS - Java Message Service such as ActiveMQ

Both of them have tutorials available, just google.

answered Dec 23, 2014 at 9:41

Aron

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1 Comment

Parker Jones Over a year ago

Yes, I heard about sockets. And I am trying to figure out how to use them.

Un3qual · Accepted Answer · 2015-08-08 18:22:12Z

1

You could use a database, or setup a json/xml api on the PHP end, and access the database, or access the json/xml from Java with this example code to open the url.

URL url = new URL("site.com/api/foo.json");

try (BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream(), "UTF-8"))) {
    for (String line; (line = reader.readLine()) != null;) {
        System.out.println(line);
    }
}

You can look at this tutorial to parse JSON with Java.

edited Aug 8, 2015 at 18:22

answered Dec 30, 2014 at 5:09

Un3qual

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2 Comments

Parker Jones Over a year ago

So you say I should write to a file with Java and read it with PHP and write a file with PHP and read it with Java? I think that would only work one way because the PHP can't access files where the Java is running.

Un3qual Over a year ago

@ParkerJones Generate the JSON from a database in PHP, and read it from Java. Write from Java using an api in PHP. It's pretty complicated, but doable. The simplest way is to use a database.

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