使用JFileChooser检查文件是否在特定目录中

Question

我制作了一个程序，我必须使用.db format在JFileChooser中保存文件。但问题是，当我创建一个具有相同名称的文件时，它会显示相同的消息，用于创建相同的文件或创建新文件。它在每种情况下都显示相同的结果False。这是我更清晰理解的代码！

public void actionPerformed(ActionEvent arg0) {
            int answer=JOptionPane.showConfirmDialog(null, "Do You Want To Create New Company ?","Confirm Dialog",JOptionPane.YES_NO_OPTION);
            switch(answer)
            {
            case JOptionPane.YES_OPTION:
                File file=new File("Database");
                file.mkdirs();
                JFileChooser fc = new JFileChooser(file);
                fc.setDialogTitle("Enter Inventory Plus File Name");
                fc.setMultiSelectionEnabled(false);
                fc.removeChoosableFileFilter(fc.getAcceptAllFileFilter());
                FileTypeFilter filefilter=new FileTypeFilter(".db","database");
                fc.setFileFilter(filefilter);
                int result = fc.showSaveDialog(null);
                if (result == JFileChooser.APPROVE_OPTION) {
                    File fileName=fc.getSelectedFile();
                    String filename=fileName.getName();
                    String filepath=fileName.getParent();
                    if(fileName.exists())
                    {
                        String message="File "+filename+".db"+" already exist in\n"+filepath+"\nDo you want to Overwrite?\n";
                        int reply=JOptionPane.showConfirmDialog(null, message,"Warning",JOptionPane.YES_NO_OPTION);
                        if(reply==JOptionPane.YES_OPTION)
                        {
                            try {
                                fileName.delete();
                                BufferedWriter writer=new BufferedWriter(new FileWriter(fileName+".db"));
                                writer.close();
                                JOptionPane.showMessageDialog(null, "File "+filename+".db"+" is Overwritten Successfully in\n"+filepath);
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                        }
                    }
                    else
                    {
                            try {
                                BufferedWriter writer=new BufferedWriter(new FileWriter(fileName+".db"));
                                writer.close();
                            } catch (IOException e) {
                                e.printStackTrace();
                            }
                    }
                }
            case JOptionPane.NO_OPTION:
            }
        }

public class FileTypeFilter extends FileFilter{

        private final String Extension;
        private final String Description;
        @Override
        public boolean accept(File file) {
            if(file.isDirectory()) {
            return true;
            }
            return file.getName().endsWith(Extension);
        }

        public FileTypeFilter(String extension, String description) {
            super();
            Extension = extension;
            Description = description;
        }

        @Override
        public String getDescription() {
            return Description + String.format("(*%s)", Extension);
        }
    }

Answer 1

解决方法是我必须检查该目录中的所有文件，并将文件名与其扩展名匹配，如果任何文件具有相同的名称，该文件已在该目录中，则显示该文件已存在的消息，否则创建新文件如果文件具有不在该目录中的不同名称，则使用该名称。

public void actionPerformed(ActionEvent arg0) {
                int answer=JOptionPane.showConfirmDialog(null, "Do You Want To Create New Company ?","Confirm Dialog",JOptionPane.YES_NO_OPTION);
                switch(answer)
                {
                case JOptionPane.YES_OPTION:
                    File file=new File("Database");
                    file.mkdirs();
                    JFileChooser fc = new JFileChooser(file);
                    fc.setDialogTitle("Enter Inventory Plus File Name");
                    fc.setMultiSelectionEnabled(false);
                    fc.removeChoosableFileFilter(fc.getAcceptAllFileFilter());
                    FileTypeFilter filefilter=new FileTypeFilter(".db","database");
                    fc.setFileFilter(filefilter);
                    int result = fc.showSaveDialog(null);
                    if (result == JFileChooser.APPROVE_OPTION) {
                        File[] dircontent=file.listFiles();
                        File fileName=fc.getSelectedFile();//Database\Second
                        String filename=fileName.getName();//second,first
                        String filepath=fileName.getParent();//database
                        for(int i=0;i<dircontent.length;i++)
                        {
                            if(dircontent[i].getName().equals(filename+".db"))
                                    {
                                String message="File "+filename+".db"+" already exist in\n"+filepath+"\nDo you want to Overwrite?\n";
                                int reply=JOptionPane.showConfirmDialog(null, message,"Warning",JOptionPane.YES_NO_OPTION);
                                if(reply==JOptionPane.YES_OPTION)
                                {
                                    try {
                                        fileName.delete();
                                        BufferedWriter writer=new BufferedWriter(new FileWriter(fileName+".db"));
                                        writer.close();
                                        JOptionPane.showMessageDialog(null, "File "+filename+".db"+" is Overwritten Successfully in\n"+filepath);
                                    } catch (IOException e) {
                                        e.printStackTrace();
                                    }
                                }
                                    }
                            else
                            {
                                    try {
                                        BufferedWriter writer=new BufferedWriter(new FileWriter(fileName+".db"));
                                        writer.close();
                                    } catch (IOException e) {
                                        e.printStackTrace();
                                    }
                            }
                        }
                    }
                case JOptionPane.NO_OPTION:
                }
            }


            public class FileTypeFilter extends FileFilter{

        private final String Extension;
        private final String Description;
        @Override
        public boolean accept(File file) {
            if(file.isDirectory()) {
            return true;
            }
            return file.getName().endsWith(Extension);
        }

        public FileTypeFilter(String extension, String description) {
            super();
            Extension = extension;
            Description = description;
        }

        @Override
        public String getDescription() {
            return Description + String.format("(*%s)", Extension);
        }

    }