从JAR运行但从Eclipse运行时，从Java应用程序打开tmp PDF时出错 [英] Error opening tmp PDF from my Java application when run from JAR but not Eclipse

问题描述

当用户在我的应用程序中单击帮助"时，我希望能够打开PDF文件. PDF文件与JAR一起定位，提取到tmp目录中，然后由awt.Desktop.getDesktop()选择打开以允许Windows和Linux使用.

I want to be able to open a PDF file when the user clicks on 'HELP' in my application. The PDF file is located with the JAR, extracted to a tmp directory and then selected to open by awt.Desktop.getDesktop () (to allow for windows and linux use).

当我从Eclipse运行该应用程序时，它运行良好，PDF正常打开.当我导出到JAR并运行时，我收到一条错误消息，指出"PDF文档已损坏"，如果我手动导航到PDF文档(在我的ubuntu机器上/tmp/546434564.pdf)，则在尝试时会遇到相同的错误打开文件.我很困惑发生了什么. 损坏"的PDF的文件大小与正常工作的PDF大小相同，因此我认为这不是许可问题.

When I run the app from Eclipse then it works fine, the PDF opens with no errors. When I export to JAR and run then I get an error stating the 'PDF document is damaged', if I navigate manually to the PDF document (on my ubuntu machine /tmp/546434564.pdf) then I get the same error when I try to open the file. I am confused what is going on. The file size of the 'damaged' PDF is the same as the working one, so I dont think it is a permission issue.

我正在使用的代码是:

public Main() throws FontFormatException, IOException {

    //lets load the font
       Font font = Font.createFont(Font.TRUETYPE_FONT, this.getClass().getResourceAsStream("/Coalition_v2.ttf")).deriveFont(Font.PLAIN, 14); 
       System.out.println(font);

    //lets write the tmp file for help to the machine now
       try {
            java.io.InputStream iss = getClass().getResourceAsStream("/nullpdf.pdf"); //update the filename here when the help guide is written
            byte[] data = new byte[iss.available()];
            iss.read(data);
            iss.close();
            String tempFile = "file";
            File temp = File.createTempFile(tempFile, ".pdf");
            FileOutputStream fos = new FileOutputStream(temp);
            fos.write(data);
            fos.flush();
            fos.close();
        tmphelpfile = temp.getAbsolutePath();
        System.out.println(tmphelpfile);
        } catch (IOException ex) {
            ex.printStackTrace();
            System.out.println("TEMP FILE NOT CREATED - ERROR in tmp file writing");
        }

然后调用pdf:

JMenu mnHelpGuide = new JMenu("Help Guide");
mnHelpGuide.addMouseListener(new MouseAdapter() {
    @Override
    public void mouseClicked(MouseEvent e) {
    //  Help();
        Desktop d = java.awt.Desktop.getDesktop ();  

        try {
            System.out.println(tmphelpfile);
            d.open (new java.io.File (String.valueOf(tmphelpfile)));
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            System.out.println("Couldnt open your file - error on HELP Guide");
            e1.printStackTrace();
        } 
    }
    });

推荐答案

感谢帮助人员.通过导入ApachecommonsIO jar，然后将代码修改为此，可以解决此问题:

Thanks for the help guys. The problem was fixed by importing the ApachecommonsIO jar and then modifying the code to this:

 try {
                java.io.InputStream iss = getClass().getResourceAsStream("/nullpdf.pdf"); //update the filename here when the help guide is written
               // byte[] data = new byte[iss.available()];
                byte[] data = IOUtils.toByteArray(iss);
                iss.read(data);
                iss.close();
                String tempFile = "file";
                File temp = File.createTempFile(tempFile, ".pdf");
                FileOutputStream fos = new FileOutputStream(temp);
                fos.write(data);
                fos.flush();
                fos.close();
            tmphelpfile = temp.getAbsolutePath();
            System.out.println(tmphelpfile);
            } catch (IOException ex) {
                ex.printStackTrace();
                System.out.println("TEMP FILE NOT CREATED - ERROR in tmp file writing");
            }

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