Node-RED node to run Java code like function node
Using the node, Node-RED users can use Java language instead of JavaScript in function node.
In the Java code of the node, msg will be received as Gson JsonObject. Then, you can add Java code to handle the data. Finally, the Java code needs to return JsonObject to send msg to the next node.
Because Gson library is used to handle JSON data in the node, the following user guide of Gson will be useful to write Java code in the node.
https://github.com/google/gson/blob/master/UserGuide.md
The Java function node supports Windows, macOS and Ubuntu.
(1) Download and install Java Development Kit
http://www.oracle.com/technetwork/java/javase/downloads/jdk10-downloads-4416644.html
(2) Set environment variables, JAVA_HOME and PATH to enable java and javac command
http://www.baeldung.com/java-home-on-windows-7-8-10-mac-os-x-linux
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[{"id":"44c7ddf6.403c24","type":"inject","z":"3cd542b9.3985de","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":180,"y":480,"wires":[["e38dcfdf.cc86e"]]},{"id":"5a9065ca.2d930c","type":"debug","z":"3cd542b9.3985de","name":"","active":true,"console":false,"complete":"false","x":510,"y":480,"wires":[]},{"id":"e38dcfdf.cc86e","type":"javafunction","z":"3cd542b9.3985de","name":"blink scroll lock","func":"Robot rb = new Robot();\nrb.keyPress(KeyEvent.VK_SCROLL_LOCK);\nrb.keyRelease(KeyEvent.VK_SCROLL_LOCK);\nreturn msg;","outputs":1,"x":340,"y":480,"wires":[["5a9065ca.2d930c"]]}]
[{"id":"b5368af2.afcbc8","type":"inject","z":"3cd542b9.3985de","name":"","topic":"","payload":"http://www.google.co.jp","payloadType":"str","repeat":"","crontab":"","once":false,"x":200,"y":380,"wires":[["272fb242.1067ee"]]},{"id":"272fb242.1067ee","type":"javafunction","z":"3cd542b9.3985de","name":"open browser","func":"URI uri = new URI(msg.get(\"payload\").getAsString());\nDesktop.getDesktop().browse(uri);\nreturn msg;","outputs":1,"x":400,"y":380,"wires":[["68407010.0f3ac"]]},{"id":"68407010.0f3ac","type":"debug","z":"3cd542b9.3985de","name":"","active":true,"console":false,"complete":"false","x":570,"y":380,"wires":[]}]
[{"id":"aee0f3ab.fadef","type":"inject","z":"3cd542b9.3985de","name":"","topic":"","payload":"data","payloadType":"str","repeat":"","crontab":"","once":false,"x":110,"y":360,"wires":[["8c33e48c.c2cac8"]]},{"id":"8c33e48c.c2cac8","type":"javafunction","z":"3cd542b9.3985de","name":"save to clipboard","func":"String str = msg.get(\"payload\").getAsString();\nToolkit tk = Toolkit.getDefaultToolkit();\nClipboard cb = tk.getSystemClipboard();\ncb.setContents(new StringSelection(str), null);\nreturn msg;","outputs":1,"x":270,"y":360,"wires":[["ce731dd.2cdc4e"]]},{"id":"ce731dd.2cdc4e","type":"debug","z":"3cd542b9.3985de","name":"","active":true,"console":false,"complete":"false","x":450,"y":360,"wires":[]},{"id":"51b942a1.110d0c","type":"inject","z":"3cd542b9.3985de","name":"","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":false,"x":120,"y":420,"wires":[["2e071160.2678ce"]]},{"id":"2e071160.2678ce","type":"javafunction","z":"3cd542b9.3985de","name":"read clipboard","func":"Toolkit tk = Toolkit.getDefaultToolkit();\nClipboard cb = tk.getSystemClipboard();\nObject oj = cb.getData(DataFlavor.stringFlavor);\nmsg.addProperty(\"payload\", oj.toString());\nreturn msg;","outputs":1,"x":280,"y":420,"wires":[["93c1a28a.e100a"]]},{"id":"93c1a28a.e100a","type":"debug","z":"3cd542b9.3985de","name":"","active":true,"console":false,"complete":"false","x":450,"y":420,"wires":[]}]
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