java日期下拉框

你是要誉胡30天的日期嘛。。。

public String genRqOpts() {

StringBuilder rtn = new StringBuilder("")

java.util.Date date = new java.util.Date()//获得当前系统时间

SimpleDateFormat simple = new SimpleDateFormat("yyyyMMdd")

String time = simple.format(date)

String cur_Y = time.substring(0,4)//年

String cur_M = time.substring(4,6)//月

String cur_D = time.substring(6,8)//日

Calendar calendar = Calendar.getInstance()//初始化对象

SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd")

calendar.set(Integer.parseInt(cur_Y), Integer.parseInt(cur_M), Integer.parseInt(cur_D))

rtn.append("<select>")

for (int i=0i<30i++) {//获取庆宏拦页面上下绝衫拉选项

calendar.add(Calendar.DATE, -1)

String elRq = sdf.format(calendar.getTime())

rtn.append("<option value='")

rtn.append(elRq)

rtn.append("'>")

rtn.append(elRq)

rtn.append("</option>")

}

rtn.append("</select>")

return rtn.toString()

}

String str = String.format("%tD", new Data())

这个只能用于格式化一个日期。

如果你旅拦要限制输入日期满足给定的格式，我觉得至少有两种解决方案：

1，使用日期控件

2，采用正则表达式判断历行输入的值是否满足给拆烂胡定的格式。

DateDropFrame extends JFrame

给year和month添加一个ItemListener来实时计算指定年春袜老和月中有多少天就可以了.

代码是用Swing写的,不过看你的图,不像是Swing界面.

/扒升好首**

* Create the frame.

*/

public DateDropFrame() {

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

setBounds(100, 100, 450, 300)

contentPane = new JPanel()

contentPane.setBorder(new EmptyBorder(5, 5, 5, 5))

contentPane.setLayout(new FlowLayout(FlowLayout.LEFT))

final JComboBox year = new JComboBox()

year.setModel(new DefaultComboBoxModel(getModel(start, end)))

contentPane.add(year)

final JComboBox month = new JComboBox()

month.setModel(new DefaultComboBoxModel(getModel(1, 12)))

contentPane.add(month)

final JComboBox day = new JComboBox()

contentPane.add(day)

year.addItemListener(new ItemListener() {

public void itemStateChanged(ItemEvent e) {

setDay(year, month, day)

}

})

month.addItemListener(new ItemListener() {

public void itemStateChanged(ItemEvent e) {

setDay(year, month, day)

}

})

setDay(year, month, day)

setContentPane(contentPane)

}

/**

* calculate days in select month &year

*/

private void setDay(JComboBox year, JComboBox month, JComboBox day) {

int y = Integer.parseInt((String) year.getSelectedItem())

int m = Integer.parseInt((String) month.getSelectedItem())

Calendar c = Calendar.getInstance()

c.set(Calendar.YEAR, y)

c.set(Calendar.MONTH, m - 1)

int days = c.getActualMaximum(Calendar.DAY_OF_MONTH)

day.setModel(new DefaultComboBoxModel(getModel(1, days)))

}

/**

* get String array [start, end]

*/

private String[] getModel(int start, int end) {

String[] m = new String[end - start + 1]

for (int i = 0i <m.lengthi++) {

m[i] = String.valueOf(i + start)

}

return m

}

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