这个也许是你想要的
public class Input extends javax.swing.JFrame {
private String limit1="[0-9]",limit2="[a-h]";
/** Creates new form Input */
public Input() {
initComponents();
CheckInput c1=new CheckInput();
c1.setCharLimit(limit1);
//设置输入范围
c1.setMaxLength(5);
//设置输入的最大长度
c1.setMaxValue(10000);
//设置输入的最大数字
jTextField1.setDocument(c1);
CheckInput c2=new CheckInput();
c2.setCharLimit(limit2);
c2.setMaxLength(7);
jTextField2.setDocument(c2);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jLabel3 = new javax.swing.JLabel();
jLabel4 = new javax.swing.JLabel();
jTextField2 = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setText("可以输入0到9之间的数字5个，最大值为10000，不正确或超出长度均报警");
jLabel2.setText("请输入");
jLabel3.setText("可以输入a到h之间的字母7个，不正确或超出长度均报警");
jLabel4.setText("请输入");
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()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel2)
.addGap(18, 18, 18)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 155, javax.swing.GroupLayout.PREFERRED_SIZE))
.addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, 384, Short.MAX_VALUE)
.addGroup(layout.createSequentialGroup()
.addComponent(jLabel4)
.addGap(18, 18, 18)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 156, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1)
.addPreferredGap(javax.swing.)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel2)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGap(18, 18, 18)
.addComponent(jLabel3)
.addGap(18, 18, 18)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jLabel4)
.addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addContainerGap(15, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Input().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JLabel jLabel3;
private javax.swing.JLabel jLabel4;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration
}
import javax.swing.text.AttributeSet;
import javax.swing.text.BadLocationException;
import javax.swing.text.PlainDocument;
import java.awt.Toolkit;
import java.util.regex.Pattern;
public class CheckInput extends PlainDocument {
private String limit = null; // 输入字符限制的正则表达式
private int maxLength = -1; // 输入字符最大长度的限制，-1为不限制
private double maxValue = 0; // 如果输入的是数字，则最大值限制
private boolean isMaxValue = false; // 是否采用了最大值限制
private Toolkit toolkit = null; // 用来在错误的时候发出系统声音
public CheckInput() {
super();
this.init();
}
private void init() {
toolkit = Toolkit.getDefaultToolkit();
}
public void setCharLimit(String limit) {
this.limit = limit;
}
public void setMaxLength(int maxLength) {
this.maxLength = maxLength;
}
public void setMaxValue(double maxValue){
this.isMaxValue = true;
this.maxValue = maxValue;
}
public void insertString(int offs, String str, AttributeSet a) throws BadLocationException, NumberFormatException {
//offs起始的偏移量
str - 要插入的字符串
// 若字符串为空，直接返回。
if (str == null) {
return;
}
char[] ch = str.toCharArray();
for (int i = 0; i < ch.length; i++) {
String temp = String.valueOf(ch[i]);
// 如果要输入的字符不在允许范围内
boolean ab=(limit).matcher(temp).find();
if (!ab) {
toolkit.beep(); // 发出声音
return;
}
// 如果有字符长度限制，并且现在的字符长度已经大于或等于限制
if (maxLength > -1 && this.getLength() >= maxLength) {
toolkit.beep(); // 发出声音
return;
}
}
// 如果内容设置了最大数字
if (isMaxValue) {
String s = this.getText(0, this.getLength()); // 文档中已有的字符
s = s.substring(0, offs) + str + s.substring(offs, s.length());
if (Double.parseDouble(s) > maxValue) {
toolkit.beep(); // 发出声音
return;
}
}
super.insertString(offs, new String(ch), a);
}
}
2008-06-01 14:16
