AWT-EventQueue-0"java.lang.NullPointerException [英] AWT-EventQueue-0" java.lang.NullPointerException

问题描述

谢谢你们的帮助，我得到了如下所示的代码，这不是我的全部，但我一直在编辑它以尝试做我想做的事，我快完成了，我只是收到一条错误消息在最后一关，我收到一条错误消息:

Thank you for your help guys, i have got the code to look like below, it is not all mine but i have been editing it to try and do what i want, i am almost done i am just getting one error message at the final hurdle, i am getting a error message :

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at java.text.AttributedString.<init>(AttributedString.java:127)
    at PrintText.print(PrintText.java:109)
    at sun.print.RasterPrinterJob.printPage(RasterPrinterJob.java:1973)
    at sun.print.RasterPrinterJob.print(RasterPrinterJob.java:1461)
    at sun.print.RasterPrinterJob.print(RasterPrinterJob.java:1277)
    at PrintText.printer(PrintText.java:98)
    at PrintText$1.run(PrintText.java:52)
    at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:721)
    at java.awt.EventQueue.access$200(EventQueue.java:103)
    at java.awt.EventQueue$3.run(EventQueue.java:682)
    at java.awt.EventQueue$3.run(EventQueue.java:680)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:691)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)

在我选择了要打印的文档之后和出现打印机框之前出现上述错误，此错误消息是什么意思?

The above error comes after i have selected the document i want to print and before the printer box appear, what does this error message mean ?

import java.awt.*;
import java.awt.font.*;
import java.awt.geom.*;
import java.awt.print.*;
import java.text.*;
import java.io.*;
import javax.swing.*;
import java.util.List;
import java.util.ArrayList;

public class PrintText implements Printable {

    private static String mText;


    // Below the code will allow the user to select a file and then print out the contents of the file
    public static void main(String[] args) throws IOException {
        new PrintText();
    }

    public PrintText() {
        EventQueue.invokeLater(new Runnable() {
                @Override
                public void run() {
                    try {
                        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                    } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    }

                    //selects the file
                    JFileChooser chooser = new JFileChooser();
                    chooser.showOpenDialog(null);
                    File file = chooser.getSelectedFile();
                    String filename = file.getName();
                    //System.out.println("You have selected: " + filename);  testing to see if file seleected was right
                    String path = file.getAbsolutePath();

                    //Reads contents of file into terminal 
                    //FileReader fr = new FileReader("filename");
                    // FileReader fr = new FileReader("D:/Documents/" + "filename")); 

                    BufferedReader br = null;
                    try {
                        br = new BufferedReader(new FileReader(path));
                        List<String> list = new ArrayList<String>();
                        while ((mText = br.readLine()) != null) {
                            //Displays the contents of the file in terminal
                            System.out.println(mText);
                            list.add(mText);
                        }

                        printer();
                    } catch (IOException exp) {
                        exp.printStackTrace();
                    } finally {
                        try {
                            br.close();
                        } catch (Exception e) {
                        }
                    }
                    //fr.close(); 
                }
            });
    }
    //private static final String mText = 
    //    "This is a test to see if this text will be printed "; //This works perfectly fine
    //AttributedString mStyledText = new AttributedString(mText);
    /**
     * Print a single page containing some sample text.
     */
    public void printer() {

        /* Get the representation of the current printer and 
         * the current print job.
         */
        PrinterJob printerJob = PrinterJob.getPrinterJob();
        /* Build a book containing pairs of page painters (Printables)
         * and PageFormats. This example has a single page containing
         * text.
         */
        Book book = new Book();
        book.append(this, new PageFormat());
        /* Set the object to be printed (the Book) into the PrinterJob.
         * Doing this before bringing up the print dialog allows the
         * print dialog to correctly display the page range to be printed
         * and to dissallow any print settings not appropriate for the
         * pages to be printed.
         */
        printerJob.setPageable(book);
        /* Show the print dialog to the user. This is an optional step
         * and need not be done if the application wants to perform
         * 'quiet' printing. If the user cancels the print dialog then false
         * is returned. If true is returned we go ahead and print.
         */
        boolean doPrint = printerJob.printDialog();
        if (doPrint) {
            try {
                printerJob.print();
            } catch (PrinterException exception) {
                System.err.println("Printing error: " + exception);
            }
        }
    }

    /**
     * Print a page of text.
     */
    public int print(Graphics g, PageFormat format, int pageIndex) {
        AttributedString mStyledText = new AttributedString(mText);
        /* We'll assume that Jav2D is available.
         */
        Graphics2D g2d = (Graphics2D) g;
        /* Move the origin from the corner of the Paper to the corner
         * of the imageable area.
         */
        g2d.translate(format.getImageableX(), format.getImageableY());
        /* Set the text color.
         */
        g2d.setPaint(Color.black);
        /* Use a LineBreakMeasurer instance to break our text into
         * lines that fit the imageable area of the page.
         */
        Point2D.Float pen = new Point2D.Float();
        AttributedCharacterIterator charIterator = mStyledText.getIterator();
        LineBreakMeasurer measurer = new LineBreakMeasurer(charIterator, g2d.getFontRenderContext());
        float wrappingWidth = (float) format.getImageableWidth();
        while (measurer.getPosition() < charIterator.getEndIndex()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            pen.y += layout.getAscent();
            float dx = layout.isLeftToRight() ? 0 : (wrappingWidth - layout.getAdvance());
            layout.draw(g2d, pen.x + dx, pen.y);
            pen.y += layout.getDescent() + layout.getLeading();
        }
        return Printable.PAGE_EXISTS;
    }
}

推荐答案

1. 不要将 print 方法设为静态.您需要在用户进行文件选择后调用它，传入文件内容...
2. 不要在 print 中创建 PrintText 的新实例，这不会与 print 共享文件选择的结果方法.
3. 确保您遵守 Swing 的 Thread 规则
4. 如果你打开它，你有责任关闭它.确保关闭流/阅读器
5. 您可能想检查一下用户是否真的选择了一个文件，但我会留给您.

1. Don't make the print method static. You need to call this after the user has made a file selection, passing in the file contents...
2. Don't create a new instance of the PrintText in the print this is not sharing the results of the file selection with the print method.
3. Make sure you are honoring the Thread rules of Swing
4. If you open it, you're responsible for closing it. Make sure you are closing you streams/readers
5. You might like to check to see if the user actually selected a file, but I'll leave that up to you.

更多类似……

public class PrintText implements Printable {

    private static String mText;

    // Below the code will allow the user to select a file and then print out the contents of the file
    public static void main(String[] args) throws IOException {
        new PrintText();
    }

    public PrintText() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                //selects the file
                JFileChooser chooser = new JFileChooser();
                chooser.showOpenDialog(null);
                File file = chooser.getSelectedFile();
                String filename = file.getName();
                //System.out.println("You have selected: " + filename);  testing to see if file seleected was right
                String path = file.getAbsolutePath();

                //Reads contents of file into terminal 
                //FileReader fr = new FileReader("filename");
                // FileReader fr = new FileReader("D:/Documents/" + "filename")); 

                BufferedReader br = null;
                try {
                    br = new BufferedReader(new FileReader(path));
                    List<String> list = new ArrayList<String>();
                    while ((mText = br.readLine()) != null) {
                        //Displays the contents of the file in terminal
                        System.out.println(mText);
                        list.add(mText);
                    }

                    printer();
                } catch (IOException exp) {
                    exp.printStackTrace();
                } finally {
                    try {
                        br.close();
                    } catch (Exception e) {
                    }
                }
                //fr.close(); 
            }
        });
    }
    //private static final String mText = 
    //    "This is a test to see if this text will be printed "; //This works perfectly fine
    AttributedString mStyledText = new AttributedString(mText);

    /**
     * Print a single page containing some sample text.
     */
    public void printer() {

        /* Get the representation of the current printer and 
         * the current print job.
         */
        PrinterJob printerJob = PrinterJob.getPrinterJob();
        /* Build a book containing pairs of page painters (Printables)
         * and PageFormats. This example has a single page containing
         * text.
         */
        Book book = new Book();
        book.append(this, new PageFormat());
        /* Set the object to be printed (the Book) into the PrinterJob.
         * Doing this before bringing up the print dialog allows the
         * print dialog to correctly display the page range to be printed
         * and to dissallow any print settings not appropriate for the
         * pages to be printed.
         */
        printerJob.setPageable(book);
        /* Show the print dialog to the user. This is an optional step
         * and need not be done if the application wants to perform
         * 'quiet' printing. If the user cancels the print dialog then false
         * is returned. If true is returned we go ahead and print.
         */
        boolean doPrint = printerJob.printDialog();
        if (doPrint) {
            try {
                printerJob.print();
            } catch (PrinterException exception) {
                System.err.println("Printing error: " + exception);
            }
        }
    }

    /**
     * Print a page of text.
     */
    public int print(Graphics g, PageFormat format, int pageIndex) {
        /* We'll assume that Jav2D is available.
         */
        Graphics2D g2d = (Graphics2D) g;
        /* Move the origin from the corner of the Paper to the corner
         * of the imageable area.
         */
        g2d.translate(format.getImageableX(), format.getImageableY());
        /* Set the text color.
         */
        g2d.setPaint(Color.black);
        /* Use a LineBreakMeasurer instance to break our text into
         * lines that fit the imageable area of the page.
         */
        Point2D.Float pen = new Point2D.Float();
        AttributedCharacterIterator charIterator = mStyledText.getIterator();
        LineBreakMeasurer measurer = new LineBreakMeasurer(charIterator, g2d.getFontRenderContext());
        float wrappingWidth = (float) format.getImageableWidth();
        while (measurer.getPosition() < charIterator.getEndIndex()) {
            TextLayout layout = measurer.nextLayout(wrappingWidth);
            pen.y += layout.getAscent();
            float dx = layout.isLeftToRight() ? 0 : (wrappingWidth - layout.getAdvance());
            layout.draw(g2d, pen.x + dx, pen.y);
            pen.y += layout.getDescent() + layout.getLeading();
        }
        return Printable.PAGE_EXISTS;
    }
}

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