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import java.text.ParseException
import javax.swing.JFormattedTextField
import javax.swing.JFrame
import javax.swing.JPanel
/**
*
* @author Administrator
*/
public class JFormattedText extends JFrame {
private JFormattedTextField text
public JFormattedText() {
JPanel panel = new JPanel()
text = new JFormattedTextField(new java.text.DecimalFormat("#0"))
//text = new JFormattedTextField()
//text.setFormatterFactory(new javax.swing.text.DefaultFormatterFactory(new javax.swing.text.NumberFormatter(new java.text.DecimalFormat("#0"))))
text.setFont(new java.awt.Font("宋体", 0, 12))// NOI18N
text.setMaximumSize(new java.awt.Dimension(50, 21))
text.setMinimumSize(new java.awt.Dimension(50, 21))
text.setPreferredSize(new java.awt.Dimension(50, 21))
//过滤输入的字符
text.addKeyListener(new java.awt.event.KeyAdapter() {
public void keyReleased(java.awt.event.KeyEvent evt) {
String old = text.getText()
JFormattedTextField.AbstractFormatter formatter = text.getFormatter()
if (!old.equals("")) {
if (formatter != null) {
String str = text.getText()
try {
long page = (Long) formatter.stringToValue(str)
text.setText(page + "")
} catch (ParseException pe) {
text.setText("1")//解析异常直接将文本框中值设置为1
}
}
}
}
})
panel.add(text)
this.add(panel)
this.setBounds(200, 100, 100, 100)
}
public static void main(String[] arg) {
new JFormattedText().setVisible(true)
}
}
<html><head>
<meta http-equiv="content-Type" content="text/htmlcharset=gb2312">
<title>js 只能输入数字和小数点</title>
<script language="JavaScript" type="text/javascript">
function clearNoNum(obj)
{
//先把非数字的都替换掉，除了数字和.
obj.value = obj.value.replace(/[^\d.]/g,"")
//必须保证第一个为数字而不是.
obj.value = obj.value.replace(/^\./g,"")
//保证只有出现一个.而没有多个.
obj.value = obj.value.replace(/\.{2,}/g,".")
//保证.只出现一次，而不能出现两次以上
obj.value = obj.value.replace(".","$#$").replace(/\./g,"").replace("$#$",".")
}
</script>
</head>
<body>
<!--把下面代码加到<body>与</body>之间-->
只能输入数字和小数点的文本框：<input id="input1" onkeyup="clearNoNum(this)">
</body>
</html>
