如果我尝试更改值，java My JSpinner将跳到1970

Question

正如我在标题中所描述的，我的微调器从数据库中显示一年中的一周，格式化的文本字段显示给定周的第一天。 到目前为止一切正常，但如果我尝试更改微调器的周，则日期会跳到1970年

这是我的喷丝头模型：

spinner_KW.setModel(new javax.swing.SpinnerDateModel(new java.util.Date(), null, null, java.util.Calendar.WEEK_OF_YEAR));

下面是我在DB和DateEditor中设置值的代码：

public void setDateKWSpinner(Date kw){
    JSpinner.DateEditor timeEditor = new JSpinner.DateEditor(spinner_KW, "w");
    spinner_KW.setEditor(timeEditor);        
    spinner_KW.setValue(kw); // will only show the current time
    setWeekfromto();
}

我真的希望我的问题不像我想的那么愚蠢-

更新

作为请求集，这里有一个小的运行代码，显示了问题：

package datespinner_test;

import java.util.Calendar;
import java.util.Date;
import javax.swing.JSpinner;

public class SpinnerJFrame extends javax.swing.JFrame {

    public SpinnerJFrame() {
        initComponents();
        setDateKWSpinner();
        setWeekfrom();
    }

    public void setDateKWSpinner(){
        JSpinner.DateEditor timeEditor = new JSpinner.DateEditor(dateSpinner, "w");
        dateSpinner.setEditor(timeEditor);
        dateSpinner.setValue(new Date());
    }

    public void setWeekfrom(){
        Calendar cal = Calendar.getInstance();
        cal.setTime((Date) dateSpinner.getModel().getValue());
        cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
        firstDayofWeek.setValue(cal.getTime());
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        dateSpinner = new javax.swing.JSpinner();
        firstDayofWeek = new javax.swing.JFormattedTextField();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        dateSpinner.setModel(new javax.swing.SpinnerDateModel(new java.util.Date(), null, null, java.util.Calendar.WEEK_OF_YEAR));
        dateSpinner.addChangeListener(new javax.swing.event.ChangeListener() {
            public void stateChanged(javax.swing.event.ChangeEvent evt) {
                dateSpinnerStateChanged(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()
                .addContainerGap()
                .addComponent(dateSpinner, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addComponent(firstDayofWeek, javax.swing.GroupLayout.PREFERRED_SIZE, 84, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(190, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(dateSpinner, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(firstDayofWeek, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );

        pack();
    }// </editor-fold>                        

    private void dateSpinnerStateChanged(javax.swing.event.ChangeEvent evt) {                                         
        setWeekfrom();
    }                                        

    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(SpinnerJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(SpinnerJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(SpinnerJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(SpinnerJFrame.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 SpinnerJFrame().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JSpinner dateSpinner;
    private javax.swing.JFormattedTextField firstDayofWeek;
    // End of variables declaration                   
}

Answer 1

编辑：满是鳗鱼的气垫船在评论中击败了我。 更好的解决方案在https://stackoverflow.com/a/3894581/2040545

---

我想问题是从这一行开始的：

JSpinner.DateEditor timeEditor = new JSpinner.DateEditor(dateSpinner, "w");

这将生成一个日期编辑器，该编辑器存储日期，但仅显示一年中的日期。当然，这会丢失信息，当尝试从用户输入更新并从一周恢复到一整年时，在引擎盖下使用的SimpleDateParser会在新纪元（即1970年）开始时填充丢失的信息

一种可能的解决方法是仅读取该日期后的一周，并使用该方法更新日期显示：

public void setWeekfrom(){
    Calendar cal = Calendar.getInstance();
    Calendar calWeekOnly = Calendar.getInstance();
    calWeekOnly.setTime((Date) dateSpinner.getModel().getValue());
    cal.set(Calendar.WEEK_OF_YEAR, calWeekOnly.get(Calendar.WEEK_OF_YEAR));
    cal.set(Calendar.DAY_OF_WEEK, cal.getFirstDayOfWeek());
    firstDayofWeek.setValue(cal.getTime());
}

然而，如果一周低于零（实际上甚至超过2）或超过52，就会产生奇怪的“环绕”效应