用javaswing实现文件拖拽上传，点击脱敏按钮，用另一个类接收swing界面上传文件的内容存入list集合中，对集合进行修改，所有数字+1，返回脱敏后的文件到swing界面中，文件可下载

以下是一个简单的示例代码，实现文件拖拽上传和数字+1的功能：

import javax.swing.*;
import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

public class FileUploadDemo extends JFrame {

    private JPanel contentPane;
    private JLabel lblFilePath;
    private JButton btnUpload;
    private JButton btnDesensitize;
    private JTextArea taContent;

    private File uploadedFile;

    public FileUploadDemo() {
        setTitle("文件上传示例");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(600, 400);
        setLocationRelativeTo(null);

        contentPane = new JPanel();
        setContentPane(contentPane);
        contentPane.setLayout(new BorderLayout());

        JPanel northPanel = new JPanel();
        northPanel.setLayout(new FlowLayout());

        lblFilePath = new JLabel("拖拽文件到这里上传");
        lblFilePath.setPreferredSize(new Dimension(300, 50));
        lblFilePath.setBorder(BorderFactory.createLineBorder(Color.BLACK));
        lblFilePath.setTransferHandler(new TransferHandler() {
            @Override
            public boolean canImport(TransferSupport support) {
                return support.isDataFlavorSupported(DataFlavor.javaFileListFlavor);
            }

            @Override
            public boolean importData(TransferSupport support) {
                if (!canImport(support)) {
                    return false;
                }

                Transferable transferable = support.getTransferable();
                try {
                    List<File> fileList = (List<File>) transferable.getTransferData(DataFlavor.javaFileListFlavor);
                    if (fileList.size() > 0) {
                        uploadedFile = fileList.get(0);
                        lblFilePath.setText(uploadedFile.getAbsolutePath());
                        taContent.setText(readFileContent(uploadedFile));
                        return true;
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }

                return false;
            }
        });
        northPanel.add(lblFilePath);

        btnUpload = new JButton("上传");
        btnUpload.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JFileChooser fileChooser = new JFileChooser();
                int result = fileChooser.showOpenDialog(FileUploadDemo.this);
                if (result == JFileChooser.APPROVE_OPTION) {
                    uploadedFile = fileChooser.getSelectedFile();
                    lblFilePath.setText(uploadedFile.getAbsolutePath());
                    taContent.setText(readFileContent(uploadedFile));
                }
            }
        });
        northPanel.add(btnUpload);

        btnDesensitize = new JButton("脱敏");
        btnDesensitize.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                List<String> contentList = new ArrayList<>();
                try {
                    BufferedReader reader = new BufferedReader(new StringReader(taContent.getText()));
                    String line;
                    while ((line = reader.readLine()) != null) {
                        contentList.add(line);
                    }
                    reader.close();
                } catch (IOException ex) {
                    ex.printStackTrace();
                }

                for (int i = 0; i < contentList.size(); i++) {
                    String content = contentList.get(i);
                    String[] tokens = content.split("\\s+");
                    StringBuilder sb = new StringBuilder();
                    for (String token : tokens) {
                        if (token.matches("\\d+")) {
                            sb.append(Integer.parseInt(token) + 1);
                        } else {
                            sb.append(token);
                        }
                        sb.append(" ");
                    }
                    contentList.set(i, sb.toString().trim());
                }

                StringBuilder sb = new StringBuilder();
                for (String content : contentList) {
                    sb.append(content).append("\n");
                }
                taContent.setText(sb.toString());
            }
        });
        northPanel.add(btnDesensitize);

        contentPane.add(northPanel, BorderLayout.NORTH);

        taContent = new JTextArea();
        JScrollPane scrollPane = new JScrollPane(taContent);
        contentPane.add(scrollPane, BorderLayout.CENTER);

        setVisible(true);
    }

    private String readFileContent(File file) {
        StringBuilder sb = new StringBuilder();
        try (BufferedReader reader = new BufferedReader(new FileReader(file))) {
            String line;
            while ((line = reader.readLine()) != null) {
                sb.append(line).append("\n");
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        return sb.toString();
    }

    public static void main(String[] args) {
        new FileUploadDemo();
    }

}

在这个示例中，我们使用了JFrame和JPanel等swing组件，实现了一个简单的文件上传界面。用户可以通过拖拽或点击“上传”按钮来选择一个文件，文件内容会显示在JTextArea中。

当用户点击“脱敏”按钮时，我们将JTextArea中的内容读取到一个List中，对List中的每一行进行数字+1的操作，最后将修改后的内容显示回JTextArea中。

注意，这里仅仅是对文件内容进行了修改，没有真正地改变上传的文件。如果需要保存修改后的文件，可以添加一个“下载”按钮，将修改后的内容保存到一个新文件中并提供下载链接。