Java 如何在netbeans中从Jframe将内容保存到我的计算机？

我有一些问题，谁能帮我一下，我是java新手。我不想在我的计算机上保存jframe中的内容，我需要一个选项，在我将其保存到我的计算机上后，我需要再次在程序中打开它，而不是txt文件，不是pdf文件？有人能帮我吗？ 这是jframe

这是目前的代码，但不起作用

 package servis1;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.StringReader;
import javax.swing.JFileChooser;

/**
 *
 * @author Boris
 */
public class NewJFrame extends javax.swing.JFrame {
     private String data;
    JFileChooser chooser = new JFileChooser();

/**
 * Creates new form NewJFrame
 */
public NewJFrame() {
    initComponents();
}
 @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

    jLabel1 = new javax.swing.JLabel();
    Imeiprezime = new java.awt.Label();
    textField1 = new java.awt.TextField();
    label2 = new java.awt.Label();
    textField2 = new java.awt.TextField();
    label3 = new java.awt.Label();
    label4 = new java.awt.Label();
    textField4 = new java.awt.TextField();
    label5 = new java.awt.Label();
    textField5 = new java.awt.TextField();
    label6 = new java.awt.Label();
    label7 = new java.awt.Label();
    jComboBox1 = new javax.swing.JComboBox();
    jLabel2 = new javax.swing.JLabel();
    jComboBox2 = new javax.swing.JComboBox();
    jScrollPane1 = new javax.swing.JScrollPane();
    jTextArea1 = new javax.swing.JTextArea();
    jScrollPane2 = new javax.swing.JScrollPane();
    jTextArea2 = new javax.swing.JTextArea();
    jButton1 = new javax.swing.JButton();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jLabel1.setFont(new java.awt.Font("Times New Roman", 1, 14)); // NOI18N
    jLabel1.setText("POTVDA O PRIJEMU NA SERVIS");

    Imeiprezime.setFont(new java.awt.Font("Dialog", 1, 12)); // NOI18N
    Imeiprezime.setText("Ime i prezime:");

    label2.setFont(new java.awt.Font("Dialog", 1, 12)); // NOI18N
    label2.setText("Broj telefona:");

    label3.setFont(new java.awt.Font("Dialog", 1, 12)); // NOI18N
    label3.setText("Proizvodjac:");

    label4.setFont(new java.awt.Font("Dialog", 1, 12)); // NOI18N
    label4.setText("Model:");

    label5.setFont(new java.awt.Font("Dialog", 1, 12)); // NOI18N
    label5.setText("IMEI:");

    label6.setFont(new java.awt.Font("Dialog", 1, 12)); // NOI18N
    label6.setText("Opis kvara:");

    label7.setFont(new java.awt.Font("Dialog", 1, 12)); // NOI18N
    label7.setText("Napomena:");

    jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Apple", "Samsung", "HTC", "Huawei" }));

    jLabel2.setFont(new java.awt.Font("Tahoma", 1, 11)); // NOI18N
    jLabel2.setText("Primio na servis:");

    jComboBox2.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Marko Markovic", "Petar Petrovic", "Janko Jankovic" }));

    jTextArea1.setColumns(20);
    jTextArea1.setRows(5);
    jScrollPane1.setViewportView(jTextArea1);

    jTextArea2.setColumns(20);
    jTextArea2.setRows(5);
    jScrollPane2.setViewportView(jTextArea2);

    jButton1.setText("Sacuvaj");
    jButton1.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            jButton1ActionPerformed(evt);
        }
    });

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(23, 23, 23)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(Imeiprezime, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(label2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(label3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(label4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(label5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(label6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(label7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jLabel2))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel1)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jComboBox1, 0, 400, Short.MAX_VALUE)
                    .addComponent(textField1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(textField2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(textField4, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(textField5, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, 166, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jButton1)
                        .addGap(49, 49, 49))
                    .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
                    .addComponent(jScrollPane2)))
            .addContainerGap(79, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(30, 30, 30)
            .addComponent(jLabel1)
            .addGap(25, 25, 25)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(Imeiprezime, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(textField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(24, 24, 24)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(label2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(textField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(18, 18, 18)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(label3, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jComboBox1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(18, 18, 18)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                .addComponent(label4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(textField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(label5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(textField5, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(label6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addGap(22, 22, 22)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(label7, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 41, Short.MAX_VALUE)
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                .addComponent(jLabel2)
                .addComponent(jComboBox2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addComponent(jButton1))
            .addGap(60, 60, 60))
    );

    pack();
}        


private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        // TODO add your handling code here:
           int retValue = chooser.showSaveDialog(null);
        if(retValue == chooser.APPROVE_OPTION){
        File f = chooser.getSelectedFile();
        try{
            BufferedReader reader = new BufferedReader(new StringReader(data));//data is string to save
            BufferedWriter writer = new BufferedWriter(new FileWriter(f));
            String str;
            while((str = reader.readLine())!= null){
                writer.write(str + System.getProperty("line.separator"));
        }
        }catch(Exception ex){
            System.out.println("Error!");
                    }
        }


    }                   



/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    /* Set the Nimbus look and feel */
    //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
    /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
     * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
     */
    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            new NewJFrame().setVisible(true);
        }
    });
}

// Variables declaration - do not modify                     
private java.awt.Label Imeiprezime;
private javax.swing.JButton jButton1;
private javax.swing.JComboBox jComboBox1;
private javax.swing.JComboBox jComboBox2;
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTextArea jTextArea1;
private javax.swing.JTextArea jTextArea2;
private java.awt.Label label2;
private java.awt.Label label3;
private java.awt.Label label4;
private java.awt.Label label5;
private java.awt.Label label6;
private java.awt.Label label7;
private java.awt.TextField textField1;
private java.awt.TextField textField2;
private java.awt.TextField textField4;
private java.awt.TextField textField5;
// End of variables declaration                   

套餐服务1；
导入java.io.BufferedReader；
导入java.io.BufferedWriter；
导入java.io.File；
导入java.io.FileWriter；
导入java.io.StringReader；
导入javax.swing.JFileChooser；
/**
*
*@作者鲍里斯
*/
公共类NewJFrame扩展了javax.swing.JFrame{
私有字符串数据；
JFileChooser chooser=新的JFileChooser（）；
/**
*创建新表单NewJFrame
*/
公共NewJFrame（）{
初始化组件（）；
}
@抑制警告（“未选中”）
//                           
私有组件（）{
jLabel1=newjavax.swing.JLabel（）；
Imeiprezime=newjava.awt.Label（）；
textField1=newjava.awt.TextField（）；
label2=newjava.awt.Label（）；
textField2=newjava.awt.TextField（）；
label3=newjava.awt.Label（）；
label4=newjava.awt.Label（）；
textField4=newjava.awt.TextField（）；
label5=newjava.awt.Label（）；
textField5=newjava.awt.TextField（）；
label6=newjava.awt.Label（）；
label7=newjava.awt.Label（）；
jcombox1=newjavax.swing.JComboBox（）；
jLabel2=newjavax.swing.JLabel（）；
jcombox2=newjavax.swing.JComboBox（）；
jScrollPane1=newjavax.swing.JScrollPane（）；
jTextArea1=newjavax.swing.JTextArea（）；
jScrollPane2=newjavax.swing.JScrollPane（）；
jTextArea2=newjavax.swing.JTextArea（）；
jButton1=newjavax.swing.JButton（）；
setDefaultCloseOperation（javax.swing.WindowConstants.EXIT_ON_CLOSE）；
jLabel1.setFont（新java.awt.Font（“Times new Roman”，1，14））；//NOI18N
jLabel1.setText（“POTVDA O PRIJEMU NA SERVIS”）；
Imeiprezime.setFont（新的java.awt.Font（“Dialog”，1，12））；//NOI18N
setText（“Imeiprezime:”）；
label2.setFont（新的java.awt.Font（“Dialog”，1，12））；//NOI18N
标签2.setText（“Broj telefona:”）；
label3.setFont（新的java.awt.Font（“Dialog”，1，12））；//NOI18N
标签3.setText（“Proizvodjac:”）；
label4.setFont（新的java.awt.Font（“Dialog”，1，12））；//NOI18N
标签4.setText（“型号：”）；
label5.setFont（新的java.awt.Font（“Dialog”，1，12））；//NOI18N
标签5.setText（“IMEI:”）；
label6.setFont（新的java.awt.Font（“Dialog”，1，12））；//NOI18N
标签6.setText（“Opis kvara:”）；
label7.setFont（新的java.awt.Font（“Dialog”，1，12））；//NOI18N
标签7.setText（“Napomena:”）；
setModel（新的javax.swing.DefaultComboxModel（新的字符串[]{“Apple”、“Samsung”、“HTC”、“Huawei”}））；
jLabel2.setFont（新的java.awt.Font（“Tahoma”，1，11））；//NOI18N
jLabel2.setText（“Primio na servis:”）；
jcombox2.setModel（新的javax.swing.DefaultComboxModel（新字符串[]{“Marko-Markovic”、“Petar-Petrovic”、“Janko-Jankovic”}）；
jTextArea1.设置列（20）；
jTextArea1.设置行（5）；
jScrollPane1.setViewportView（jTextArea1）；
jTextArea2.设置列（20）；
jTextArea2.设置行（5）；
jScrollPane2.setViewportView（jTextArea2）；
jButton1.setText（“Sacuvaj”）；
jButton1.addActionListener（新java.awt.event.ActionListener（）{
public void actionPerformed（java.awt.event.ActionEvent evt）{
jButton1ActionPerformed（evt）；
}
});
javax.swing.GroupLayout=newjavax.swing.GroupLayout（getContentPane（））；
getContentPane（）.setLayout（布局）；
layout.setHorizontalGroup(
createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addGroup（layout.createSequentialGroup（）
.addGap（23,23,23）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addComponent（Imeiprezime，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（label2，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（label3，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（label4，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（label5，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（label6，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（label7，javax.swing.GroupLayout.PREFERRED\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.PREFERRED\u SIZE）
.addComponent（jLabel2））
.addPreferredGap（javax.swing.LayoutStyle.ComponentPlacement.RELATED）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING）
.addComponent（jLabel1）
.addGroup（layout.createParallelGroup（javax.swing.GroupLayout.Alignment.LEADING，false）
.addComponent（JCombox1，0，400，短.MAX_值）
.addComponent（textField1，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addComponent（textField2，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addComponent（textField4，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addComponent（textField5，javax.swing.GroupLayout.DEFAULT\u SIZE，javax.swing.GroupLayout.DEFAULT\u SIZE，Short.MAX\u值）
.addGroup（layout.createSequentialGroup（）