JFileChooser文件的选择与保存

JFileChooser chooser = new JFileChooser();

      chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);//只能选择文件夹

JFileChooser fileChooser = new JFileChooser();

    fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);//只能选择文件

int flag = fileChooser.showOpenDialog(this);

    if(flag ==JFileChooser.APPROVE_OPTION){

     File file = fileChooser.getSelectedFile();   

     attachHorizontalList.addNewAttaches(file);

     jScrollPane.setBorder(BorderFactory.createEmptyBorder(0, 10, 10, 10));

//     jScrollPane.setBorder(BorderFactory.createTitledBorder("共"+(++count)+"份附件"));

     jScrollPane.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_NEVER);

     jScrollPane.setOpaque(false);

     jScrollPane.getViewport().setOpaque(false);

     this.add(jScrollPane);

     this.repaint();

    }

JFileChooser chooser = new JFileChooser();

      chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

      int flag = chooser.showSaveDialog(mainFrame);

      if (flag == JFileChooser.APPROVE_OPTION) {

       String path = chooser.getSelectedFile().getAbsolutePath()+attachmentName;

       try {

        FileInputStream ins = new FileInputStream(

          attachmentFile);

        FileOutputStream out = new FileOutputStream(path);

        byte b[] = new byte[512];

        while ((ins.read(b)) > 0) {

         out.write(b);

        }

        out.close();

        ins.close();

       } catch (IOException e2) {

        JOptionPane.showMessageDialog(null, "保存失败");

        e2.printStackTrace();

       }     

      }

打开对话框和保存对话框的设计   swing java

1.点击打开按钮后，打开一个对话框

button.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

//产生一个文件选择器

jChooser = new JFileChooser();

//设置默认的打开目录,如果不设的话按照window的默认目录(我的文档)

jChooser.setCurrentDirectory(new File("e:/"));

//设置打开文件类型,此处设置成只能选择文件夹，不能选择文件

jChooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);//只能打开文件夹

//打开一个对话框

int index = jChooser.showDialog(null, "打开文件");

if (index == JFileChooser.APPROVE_OPTION) {

//把获取到的文件的绝对路径显示在文本编辑框中

jt.setText(jChooser.getSelectedFile().getAbsolutePath());

readPath = jt.getText() + "\\";

}

}

});

2.点击保存按钮后，打开一个保存对话框

button2.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

jChooser2 = new JFileChooser();

jChooser2.setCurrentDirectory(new File("e:/"));//设置默认打开路径

jChooser2.setDialogType(JFileChooser.SAVE_DIALOG);//设置保存对话框

//将设置好了的两种文件过滤器添加到文件选择器中来

TxtFileFilter txtFileFilter = new TxtFileFilter();

XlsFileFilter xlsFileFilter = new XlsFileFilter();

jChooser2.addChoosableFileFilter(txtFileFilter);

jChooser2.addChoosableFileFilter(xlsFileFilter);

int index = jChooser2.showDialog(null, "保存文件");

if (index == JFileChooser.APPROVE_OPTION) {

File f = jChooser2.getSelectedFile();

String fileName = jChooser2.getName(f) + ".xls";

writePath = jChooser2.getCurrentDirectory().getAbsolutePath() + fileName;

try {

writeFile();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

//程序执行完毕后，出现一个对话框来提示

int option = JOptionPane.showConfirmDialog(null, "贱人:结果已产生", "结果",

JOptionPane.YES_NO_OPTION);

System.exit(0);

}

}

});

//重写文件过滤器，设置打开类型中几种可选的文件类型，这里设了两种，一种txt，一种xls

class TxtFileFilter extends FileFilter {

@Override

public boolean accept(File f) {

// TODO Auto-generated method stub

String nameString = f.getName();

return nameString.toLowerCase().endsWith(".txt");

}

@Override

public String getDescription() {

// TODO Auto-generated method stub

return "*.txt(文本文件)";

}

}

class XlsFileFilter extends FileFilter {

@Override

public boolean accept(File f) {

// TODO Auto-generated method stub

String nameString = f.getName();

return nameString.toLowerCase().endsWith(".xls");

}

@Override

public String getDescription() {

// TODO Auto-generated method stub

return "*.xls(表格文件)";

}

}