Java socket printing

[Geert De Pauw]

Hello,

I am a beginner with java, I need to create a java swing application with a button to print to a Zebra printer.

So I need to send for example: "Hello World" to ip address 192.168.0.20 with port number 9100.

How can I proceed with this?

I have already my swing application with my print button.

Regards

My code :

                   
        Socket clientSocket = new Socket("192.168.100.200",9100);

    DataOutputStream outToServer = new DataOutputStream(clientSocket.getOutputStream() );
            //The data being sent in the lines below illustrate CPCL  one can change the data for the corresponding 
            //language being used (ZPL, EPL)   
   
     outToServer.writeBytes("! 0 200 200 203 1" + 'n' + "CENTER" + 'n');
            outToServer.writeBytes("TEXT 0 3 10 50 JAVA TEST" + 'n' + "PRINT" + 'n');

    try {
    Thread.sleep(1000);
} catch(InterruptedException ex) {
    Thread.currentThread().interrupt();
}
    clientSocket.close();        // TODO add your handling code here:
    }                                        

[Henry Wong]

Geert De Pauw wrote:
So I need to send for example: "Hello World" to ip address 192.168.0.20 with port number 9100.

How can I proceed with this?

If you need to connect via TCP, then you take a look at the Socket class. If you need to connect via UDP, then you take a look at the DatagramSocket class... but ... does the printer really allows a direct connection? I thought that there was a protocol talking to print servers.

Henry

[Geert De Pauw]

Hello Henry,

I implemented this:

https://km.zebra.com/kb/index?page=content&id=SO7149&actp=RSS

But I think I didn't implement it correctly.(it's not a swing example)

Need a TCP/ip socket to ip address and port 9100

[Tim Moores]

I took the liberty of removing the Swing code, since the problem is I/O related.

Why do you think you implemented it incorrectly? What happens when you run this code? I assume that you have ascertained that the code is being called at all; if not, start with that.

[Geert De Pauw]

Without the swing code it's working.

With swing code a receive the error's:

Exception in thread "AWT-EventQueue-0" java.lang.RuntimeException: Uncompilable source code - unreported exception java.net.UnknownHostException; must be caught or declared to be thrown
at convert.ConvertTemperature.jButton1ActionPerformed(ConvertTemperature.java:68)
at convert.ConvertTemperature.access$000(ConvertTemperature.java:15)
at convert.ConvertTemperature$1.actionPerformed(ConvertTemperature.java:42)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6535)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6300)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4891)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2750)
at java.awt.Component.dispatchEvent(Component.java:4713)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
BUILD SUCCESSFUL (total time: 28 seconds)

[Henry Wong]

First, read this...

https://coderanch.com/wiki/660183/Wiki/Fix-Compiler-Errors-Running-Application

I highly recommend that you use the compiler to find errors, and fix them first. Running the application to find compiler errors is not very ideal (see Wiki for reason).


As for the compiler error, it looks like you forgot to handle a checked exception.

Henry