如何创建一个可执行的 jar 文件，该文件可以执行同一 package 中其他 java 类的方法

Question

文件夹结构的图像：我的项目的文件夹结构

I am trying to create a executable jar file from the eclipse.. I have 3 classes in java package, in that one class is main class and other 2 classes contains some methods which are there in the main class. I have checked in the online and created a jar file but it is not executing the output from the other class methods.. how I know is I ran the same in eclipse and it is giving output but when I running it from the executable jar file它没有执行其他类的方法。 所以有人可以帮我创建一个 jar 文件。

我按照本网站https://www.java67.com/2014/04/how-to-make-executable-jar-file-in-Java-Eclipse.ZFC336988883A2中的步骤创建了 jar 文件

用户界面图片

当用户单击“生成”按钮时，它将开始执行同一个 class 中的方法，并且在该方法中我正在调用另一个 class 方法。

方法

public static String generateOutput(String url, String tagName) {
        XpathUITest output = new XpathUITest();

        try {
            return output.xpathBuilder(url, tagName);
        } catch (IOException | InterruptedException e) {
            return "Failed with exceotion, please try again";
        }
    }

生成按钮执行代码

bj.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                
                JLabel j = null;
                url = userInput.getText();
                if(!url.startsWith("http") || !url.startsWith("https")){
                    url="";
                }
                locType = combo.getSelectedItem().toString();
                tagName = comboTags.getSelectedItem().toString();
                boolean executeOutput = false;
                JPanel output = new JPanel(new BorderLayout(4, 4));
                output.setPreferredSize(new DimensionUIResource(500, 350));
                JPanel resOpJP = new JPanel(new GridLayout(0, 1, 4, 4));
                resOpJP.add(new JLabel("Output : ", SwingConstants.LEFT));
                JButton downLoad = new JButton("Download in file");

                JPanel Message = new JPanel();
                if (url.isEmpty()
                        && (selectedFile != null && selectedFile.endsWith(".html") && !selectedFile.isEmpty())) {
                    j = new JLabel("Selected File/URL is " + selectedFile, SwingConstants.RIGHT);
                    inputPath = selectedFile;
                    executeOutput = true;
                } else if ((url.startsWith("http") || url.startsWith("https"))
                        && (selectedFile == null || selectedFile.isEmpty())) {
                    j = new JLabel("Selected File/URL is " + url, SwingConstants.RIGHT);
                    inputPath = url;
                    executeOutput = true;
                } else if ((url==null ||url.isEmpty()) && (selectedFile == null || selectedFile.isEmpty())) {
                    JOptionPane.showMessageDialog(Message, "Please provide a valid html file / provide a URL", "Error",
                            JOptionPane.ERROR_MESSAGE);
                } else if (selectedFile != null && !selectedFile.isEmpty()) {
                    if (selectedFile.contains("html") && !(new File(selectedFile).exists())) {
                        JOptionPane.showMessageDialog(Message, "Please provide a valid html file path", "Error",
                                JOptionPane.ERROR_MESSAGE);
                        selectedFile = "";
                    } else if (!selectedFile.endsWith(".html") && (new File(selectedFile).exists())) {
                        JOptionPane.showMessageDialog(Message, "Please provide a valid html file", "Error",
                                JOptionPane.ERROR_MESSAGE);
                        selectedFile = "";
                    }
                } else if (!url.isEmpty() && (!url.startsWith("http") || !url.startsWith("https"))) {
                    JOptionPane.showMessageDialog(Message, "Please provide a valid URL", "Error",
                            JOptionPane.ERROR_MESSAGE);
                }

                if (locType.contains("Select Locator") || tagName.contains("Select Tag")) {
                    executeOutput = false;
                    JOptionPane.showMessageDialog(Message, "Locator Type and Tag is mandatory", "Error",
                            JOptionPane.ERROR_MESSAGE);
                } else if (!locType.contains("Select Locator") && !tagName.contains("Select Tag")) {
                    executeOutput = true;
                }
                if (executeOutput) {

    ///*****This is the step where other class method invoke***///
                    xpathUI.expectedOutput = generateOutput(inputPath, tagName);
                    if (xpathUI.expectedOutput.equals("No html tag found in the provided html")) {
                        JOptionPane.showMessageDialog(new JPanel(), xpathUI.expectedOutput, "Information",
                                JOptionPane.WARNING_MESSAGE);
                    } else if(xpathUI.expectedOutput.contains("Error")){
                        JOptionPane.showMessageDialog(new JPanel(), xpathUI.expectedOutput, "Error Message",
                                JOptionPane.ERROR_MESSAGE);
                    }else {
                    downLoad.addActionListener(new ActionListener() {

                        @SuppressWarnings("null")
                        @Override
                        public void actionPerformed(ActionEvent e) {
                                JFrame jF = new JFrame();
                                jF.setSize(300, 300);
                                choose = new JFileChooser();
                                choose.showSaveDialog(jF);
                                choose.setCurrentDirectory(new File(System.getProperty("user.home")));
                                choose.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
                                try {
                                    String saveFile = "";
                                    try {
                                        saveFile = choose.getSelectedFile().getAbsolutePath();
                                        System.out.println(saveFile);
                                    } catch (Exception ex) {
                                        saveFile = "";
                                    }

                                    if ((saveFile != null || !saveFile.isEmpty())
                                            && !saveFile.split(".txt")[0].isEmpty()) {
                                        FileOutputStream fout = new FileOutputStream(new File(saveFile));
                                        fout.write(xpathUI.expectedOutput.getBytes());
                                        fout.flush();
                                        fout.close();
                                        if (new File(saveFile).exists()) {
                                            JOptionPane.showMessageDialog(new JPanel(),
                                                    "Locator file saved successfully at :\n" + saveFile,
                                                    "Confirmation Message", JOptionPane.INFORMATION_MESSAGE);
                                        }
                                    }

                                } catch (IOException e1) {
                                    e1.printStackTrace();
                                }
                            }
                    });

                    j.setFont(new FontUIResource("Arial", Font.PLAIN, 10));
                    resOpJP.add(j);
                    output.add(resOpJP, BorderLayout.LINE_START);
                    JPanel text = new JPanel(new GridLayout(0, 1));
                    JTextArea jta = new JTextArea();
                    jta.setText("");
                    jta.setText(xpathUI.expectedOutput);
                    jta.setLineWrap(true);
                    jta.setRows(15);
                    jta.setColumns(1);
                    text.add(jta);
                    output.add(text, BorderLayout.PAGE_END);
                    JOptionPane.showOptionDialog(null, output, "XPATH Generator : Output", JOptionPane.DEFAULT_OPTION,
                            JOptionPane.INFORMATION_MESSAGE, null, new Object[] { downLoad }, null);
                }
            }
        }
    });

Answer 1

我将总结解决方案。 依赖库未打包在 JAR 中。 因此，导致

NoClassDefFoundError:org/jsoup/Jsoup

Thus, repackaging the jsoup dependency using maven https://maven.apache.org/guides/getting-started/maven-in-five-minutes.html solved this issue.

一个快速的解决方法是通过 IDE 复制生成的 jar。