javaPOS将库添加到项目

Question

我刚刚试着用我买的epson tm-t20打印机运行我得到的示例java文件。这些类应该可以运行，但它们总是给我错误。我已经看了8个多小时了，现在我真的很沮丧。这是它抛给我的一个异常：

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/xerces/parsers/DOMParser
at jpos.config.simple.xml.AbstractXercesRegPopulator.<init>(Unknown Source)
at jpos.config.simple.xml.XercesRegPopulator.<init>(Unknown Source)
at jpos.config.simple.xml.SimpleXmlRegPopulator.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
at java.lang.Class.newInstance0(Class.java:372)
at java.lang.Class.newInstance(Class.java:325)
at jpos.loader.simple.SimpleServiceManager.initRegPopulator(Unknown Source)
at jpos.loader.simple.SimpleServiceManager.initEntryRegistry(Unknown Source)
at jpos.loader.simple.SimpleServiceManager.init(Unknown Source)
at jpos.loader.simple.SimpleServiceManager.<init>(Unknown Source)
at jpos.loader.JposServiceLoader.<clinit>(Unknown Source)
at jpos.BaseJposControl.open(Unknown Source)
at postest.Step1Frame.processWindowEvent(Step1Frame.java:83)
at java.awt.Window.processEvent(Window.java:2003)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Window.dispatchEventImpl(Window.java:2713)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:680)
at java.awt.EventQueue$4.run(EventQueue.java:678)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

下面是我看过的示例代码：

POSPrinterControl19 ptr = (POSPrinterControl19)new POSPrinter();


JPanel contentPane;
JPanel jPanel_reciept = new JPanel();
TitledBorder titledBorder1;
GridBagLayout gridBagLayout1 = new GridBagLayout();
GridBagLayout gridBagLayout2 = new GridBagLayout();
JButton jButton_Print = new JButton();

/**Construct "Frame"*/
public Step1Frame() {
    enableEvents(AWTEvent.WINDOW_EVENT_MASK);
    try {
        jbInit();
    }
    catch(Exception e) {
        e.printStackTrace();
    }
}

/**Form the component*/
private void jbInit() throws Exception  {
    //setIconImage(Toolkit.getDefaultToolkit().createImage(Step1Frame.class.getResource("[Your Icon]")));
    contentPane = (JPanel) this.getContentPane();
    titledBorder1 = new TitledBorder(BorderFactory.createEtchedBorder(Color.white,new Color(134, 134, 134)),"Receipt");
    contentPane.setLayout(gridBagLayout1);
    this.setSize(new Dimension(300, 180));
    this.setTitle("Step 1  Print \"Hello JavaPOS\"");
    jPanel_reciept.setLayout(gridBagLayout2);
    jPanel_reciept.setBorder(titledBorder1);
    jButton_Print.setText("Print");
    jButton_Print.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            jButton_Print_actionPerformed(e);
        }
    });
    contentPane.add(jPanel_reciept, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(15, 0, 0, 0), 20, 20));
    jPanel_reciept.add(jButton_Print, new GridBagConstraints(0, 0, 1, 1, 0.0, 0.0
            ,GridBagConstraints.CENTER, GridBagConstraints.NONE, new Insets(5, 10, 5, 10), 130, 0));
}

/**
 * Outline     The processing code required in order to enable
 *            or to disable use of service is written here.
 * @exception JposException  This exception is fired toward the failure of
 *                          the method which JavaPOS defines.
 */
/**When the window was closed*/
protected void processWindowEvent(WindowEvent e) {
    super.processWindowEvent(e);
    if (e.getID() == WindowEvent.WINDOW_CLOSING) {
        this.closing();
    }
    /**When the window open*/
    else if (e.getID() == WindowEvent.WINDOW_OPENED) {
        // JavaPOS's code for Step1
        try {
            //Open the device.
            //Use the name of the device that connected with your computer.
                            //ptr.clearPrintArea();
            ptr.open("POSPrinter");

            //Get the exclusive control right for the opened device.
            //Then the device is disable from other application.
            ptr.claim(1000);

            //Enable the device.
            ptr.setDeviceEnabled(true);
        }
        catch(JposException ex) {
        }
    }
    // JavaPOS's code for Step1--END
}

//***********************Button*************************************************
/**
 * Outline      The code for using the most standard method "PrintNormal"
 *             to print is described.
 */
void jButton_Print_actionPerformed(ActionEvent e) {
    // JavaPOS's code for Step1
    try{
        //printNormal(int station, String data)
        //A string is sent by using the method "printNormal", and it is printed.
        // "\n" is the standard code for starting a new line.
        // When the end of the line have no "\n",printing by
        //  using the method "printNormal" doesn't start, may be.
        ptr.printNormal(POSPrinterConst.PTR_S_RECEIPT,"Hello JavaPOS\n");
    }
    catch(JposException ex){
    }
    // JavaPOS's code for Step1--END
}

//***********************Method*************************************************
/**
 * Outline     The code to finish a service.
 */
void closing(){
    // JavaPOS's code for Step1
    try{
        //Cancel the device.
        ptr.setDeviceEnabled(false);

        //Release the device exclusive control right.
        ptr.release();

        //Finish using the device.
        ptr.close();
    }
    catch(JposException ex){
    }
    // JavaPOS's code for Step1--END
    System.exit(0);
}

Answer 1

您必须将一些额外的依赖库添加到项目类路径中，其中一个似乎是apache xerces XML解析器，因此基本上您必须将该jar库添加到类路径中。

您可以找到apache xerces XML解析器here。

Answer 2

对于我来说，缺少org/apache/xerces/parsers/DOMParser类。你可以从maven repository xercesImpl.jar下载