Java_打开/保存文件

  private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {                                        

         int result;
        JFileChooser fileChooser = new JFileChooser(); // 文件选择框
        File file = null; // 接收文件
        result = fileChooser.showSaveDialog(jButton2); // 显示保存框
        if (result == JFileChooser.APPROVE_OPTION) { // 选择的是确定按钮
            file = fileChooser.getSelectedFile(); // 得到选择的文件
            JOptionPane.showMessageDialog(null, "选择的存储文件名称为：" + file.getName(), "保存", JOptionPane.ERROR_MESSAGE);

        } else if (result == JFileChooser.CANCEL_OPTION) {
            JOptionPane.showMessageDialog(null, "没有选择任何文件", "保存", JOptionPane.ERROR_MESSAGE);

        } else {
            JOptionPane.showMessageDialog(null, "操作出现错误", "Error", JOptionPane.ERROR_MESSAGE);
        }
        if (file != null) {
            try {
                PrintStream out = new PrintStream(new FileOutputStream(file));
                out.print(jPanel1.getvector());

                out.close();
            } catch (Exception e1) {
            }
        }
    }                                       

    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                        

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try {
            JFileChooser fc = new JFileChooser();
            int intRetVal = fc.showOpenDialog(jButton1);
            if (intRetVal == JFileChooser.APPROVE_OPTION) {
                br = new BufferedReader(new FileReader(fc.getSelectedFile().getPath()));
                String temp = br.readLine();
                String s1=new String();
//                jTextArea_Before.setText(null);
                while (temp != null) {
//                    jTextArea_Before.append(temp + " ");
                   s1 += temp;
                    temp = br.readLine();
                }
//                JOptionPane.showMessageDialog(null, s1, "Error", JOptionPane.ERROR_MESSAGE);
                jPanel1.setvector(s1);
                jPanel1.repaint();
               
            }
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "文件打开失败!!!\n" + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
        }

 

 

    }