using jssc and java applet to communicate to Serial with JS but browser freezes
Question
Im trying to talk to the serial port with JS using a java applet. Im not too experienced with java but i managed to get jssc running just fine when not in a applet or using js. and Ive also been able to talk between an applet and JS passing functions and variables. but I cannot understand why my browers freezes everytime i try to load the serialCom.class applet that contains the jssc information
here is my java
import jssc.SerialPort;
import jssc.SerialPortException;
import java.applet.*;
import java.awt.*;
public class serialCom extends Applet{
SerialPort serialPort;
public void connect(){
serialPort = new SerialPort("/dev/pts/2");
try {
serialPort.openPort();
serialPort.setParams(9600, 8, 1, 0);
serialPort.writeBytes("Hello Again".getBytes());
serialPort.closePort();
}
catch (SerialPortException ex){
System.out.print(ex);
}
}
public void disconnect(){
//SerialPort serialPort = new SerialPort("/dev/pts/1");
try {
//serialPort.openPort();
//serialPort.setParams(9600, 8, 1, 0);
//serialPort.writeBytes("Hello Again".getBytes());
serialPort.closePort();
}
catch (SerialPortException ex){
System.out.print(ex);
}
}
public void writeSerial(){
//SerialPort serialPort = new SerialPort("/dev/pts/1");
try {
//serialPort.openPort();
//serialPort.setParams(9600, 8, 1, 0);
serialPort.writeBytes("Hello Again".getBytes());
//serialPort.closePort();
}
catch (SerialPortException ex){
System.out.print(ex);
}
}
}
and here is my html
<!DOCTYPE html>
<html>
<head>
<title>
Will It Work
</title>
</head>
<body>
<div>
<button id="test" onclick="connectTest();">Connect</button>
<button id="test" onclick="writeTest();">Write</button>
<button id="test" onclick="readTest();">Read</button>
<button id="test" onclick="disconnectTest();">Disconnect</button>
<applet code="serialCom.class" id="myApplet" width="0" height="0"></applet>
<script>
var connectTest = function(){
alert("Im Connected");
myApplet.connect();
}
alert("Connect");
var disconnectTest = function(){
alert("Im Disconnected");
myApplet.disconnect();
}
alert("Disconnect");
var writeTest = function(){
alert("Im Writing");
myApplet,writeSerial();
}
alert("Write");
var readTest = function(){
}
alert("Read");
</script>-->
</div>
</body>
</html>
1 answers
solution1
0 2014-03-11 21:07:32
I'm quite new to all this java applet programming, but its seems like we are trying to do something similar. I have no idea what exactly is wrong with your code but I found jss-bridge which helped me a lot on achieving serial port communication trough javascript/java-applet.
you can download the full code using svn
svn checkout http://java-simple-serial-connector.googlecode.com/svn/trunk/ java-simple-serial-connector-read-only
inside the js_terminal folder you will find an index.html that simulates a terminal on your browser to communicate with the serial ports. it works amazingly well. you will also probably need to lower your java security setting or self-sign the applet.
I hope it helps!
pd: I know it isn't an answer, but i can't comment yet.
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