How to use firebase with javafx

2020-06-17 06:10发布

站内问答 / 前端开发
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am building a desktop application that I want to use the intuitive firebase API for live data syncs. I have been searching the web but no one points out what Jars to use and how to configure with your firebase application. If you can assist please give me steps. I am good at following steps. I want to create a helper class for all firebase operations.

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神经病院院长
2楼-- · 2020-06-17 06:15

It is risky to use the admin SDK on a client machine because it has admin rights to your database. I have developed a work around by creating a WebEngine that will read a html file that has no body just the firebase web scripts. 

<!DOCTYPE html>
<html>`
<head>
    <script src="https://www.gstatic.com/firebasejs/4.3.0/firebase.js"></script>

    <title></title>
</head>
<body>
</body>
<script>
    try {
        var config = {
          //firebase config here
        };

        firebase.initializeApp(config);
        var data = firebase.database();
        var ref = data.ref("/ref");
        ref.on("value", function (snapshot) {
            //pass snapshot to java
            alert(JSON.stringify(snapshot.val()));
        });
    } catch (error) {
        alert("Error - jse:" + error.message);
    }
</script>
</html>

and to retrieve it in java

    //Start new webengine to run javascript.
    final WebEngine engine = new WebEngine();
    //get my html file.
    final URL url = NoficationTest.class.getResource("/javafx.html");
    //set to catch alerts from the javascript.
    engine.setOnAlert(event -> {
        try {

            final String data = event.getData();
            if (data != null) {
                if (data.contains("jse")) {
                      //handle if error in javascript.
                } else {
                      //handle if successfull
                }
            }
        } catch (final IOException e) {
            e.printStackTrace();
        }
    });
    //Load html into webengine.
    engine.load(url.toString());

There is a better way for the javascript to call the java side of things, I just did it that way to have a fast answer. I have tested this and it works.

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萌系小妹纸
3楼-- · 2020-06-17 06:22

You can use the REST Api for accessing database as well as authentication. Check out this answer: https://stackoverflow.com/a/37419212/5287436

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手持菜刀，她持情操
4楼-- · 2020-06-17 06:35

Follow the steps from https://firebase.google.com/docs/server/setup

Which can be broken down into:

  • Create a firebase project
  • Download the SDK from Maven
  • Download the service account file which you can create from the web interface
  • Add the SDK
  • Initialize the SDK

I think the problem is that it is easy to overlook some of the steps on the website. Just follow them step by step and read carefully what steps are listed.

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