WebSocketJson.java
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package net.ziemers.swxercise.ui.ws;
import javax.json.Json;
import javax.json.JsonObject;
import javax.json.JsonReader;
import javax.json.JsonReaderFactory;
import javax.websocket.DecodeException;
import javax.websocket.Decoder;
import javax.websocket.EncodeException;
import javax.websocket.Encoder;
import javax.websocket.EndpointConfig;
import java.io.StringReader;
import java.util.Collections;
/**
* Ein Beispiel-JSON zur Übertragung durch den WebSocket.
*
* Copyright (c) 2017 Dipl.-Inform. Thomas Ziemer
*
* This file is part of swXercise.
*
* swXercise is free software: you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation, either version 3
* of the License, or (at your option) any later version.
*
* swXercise is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
* even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with swXercise.
* If not, see <http://www.gnu.org/licenses/>.
*/
public class WebSocketJson {
/**
* Wandelt ein Objekt der Klasse in einen JSON-String um.
*/
public static class MessageEncoder implements Encoder.Text<WebSocketJson> {
@Override
public void init(EndpointConfig config) {}
@Override
public String encode(WebSocketJson message) throws EncodeException {
return Json.createObjectBuilder()
.add("message", message.getMessage())
.build()
.toString();
}
@Override
public void destroy() {}
}
/**
* Wandelt einen JSON-String in ein Objekt der Klasse um.
*/
public static class MessageDecoder implements Decoder.Text<WebSocketJson> {
private JsonReaderFactory factory = Json.createReaderFactory(Collections.emptyMap());
@Override
public void init(EndpointConfig config) {}
@Override
public WebSocketJson decode(String str) throws DecodeException {
WebSocketJson message = new WebSocketJson();
JsonReader reader = factory.createReader(new StringReader(str));
JsonObject json = reader.readObject();
message.setMessage(json.getString("message"));
return message;
}
@Override
public boolean willDecode(String str) {
return true;
}
@Override
public void destroy() {}
}
/*
* Payload der JSON-Nachricht
*/
private String message;
private WebSocketJson() {}
public String getMessage() {
return message;
}
private void setMessage(String message) {
this.message = message;
}
}