类似微软IP输入框的实例

 这是一个SWING组件，可以直接实例化加到框架中

其思想就是创建4个带格式文本框，这个文本框只能输入0-255之间的数字，输入完一个可以直接跳到下一个输入框，支持小键盘左右键操作

package textField;import java.awt.Color;import java.awt.Dimension;import java.awt.Rectangle;import java.awt.event.ComponentEvent;import java.awt.event.KeyEvent;import java.util.StringTokenizer;import javax.swing.BorderFactory;import javax.swing.JLabel;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.SwingConstants;import javax.swing.border.Border;import javax.swing.text.AttributeSet;import javax.swing.text.BadLocationException;import javax.swing.text.PlainDocument;/** * 一个完整的IP输入框实例，只有一个文件 */public class IPField extends JPanel {private static final Dimension fixedDimension = new Dimension(140, 26);private static final int fixedWidth = 140; // 组件的固定长度private static final int fixedHeight = 26; // 组件的固定宽度private String ipAddress;DigitalText digitalText1 = new DigitalText();DigitalText digitalText2 = new DigitalText();DigitalText digitalText3 = new DigitalText();DigitalText digitalText4 = new DigitalText();JLabel jLabel1 = new JLabel();JLabel jLabel2 = new JLabel();JLabel jLabel3 = new JLabel();Border border;public IPField() {try {jbInit(); // 初始化} catch (Exception ex) {ex.printStackTrace();}}/** * <pre> * * Function: jbInit * Description: 初始化，由构造函数调用 * </pre> * * @param void * @return void * @exception Exception */private void jbInit() throws Exception {border = BorderFactory.createEmptyBorder(); // 创建一个不占用空间的空边框（顶线、底线、左边框线和右边框线的宽度都为零）this.setLayout(null);this.setBorder(BorderFactory.createEtchedBorder()); // 创建一个具有“浮雕化”外观效果的边框，将组件的当前背景色用于高亮显示和阴影显示this.addComponentListener(new java.awt.event.ComponentAdapter() {public void componentResized(ComponentEvent e) {this_componentResized(e);}});this.setSize(fixedWidth, fixedHeight);this.setMaximumSize(fixedDimension);this.setMinimumSize(fixedDimension);this.setPreferredSize(fixedDimension);// 设置第一个输入框属性digitalText1.setMaxLength(3); // 3列，即3位数digitalText1.setMaxValue(255);digitalText1.setValue(255);digitalText1.setBorder(border);digitalText1.setHorizontalAlignment(SwingConstants.CENTER);digitalText1.setBounds(new Rectangle(2, 2, 30, 22)); // X坐标，Y坐标，宽，高digitalText1.addKeyListener(new java.awt.event.KeyAdapter() {public void keyReleased(KeyEvent e) {digitalText1_keyReleased(e);}});digitalText1.addKeyListener(new java.awt.event.KeyAdapter() {public void keyPressed(KeyEvent e) {digitalText1_keyPressed(e);}});// 设置第二个输入框属性digitalText2.setBounds(new Rectangle(37, 2, 30, 22));digitalText2.setBorder(border);digitalText2.setHorizontalAlignment(SwingConstants.CENTER);digitalText2.setMaxLength(3);digitalText2.setMaxValue(255);digitalText2.setValue(255);digitalText2.addKeyListener(new java.awt.event.KeyAdapter() {public void keyReleased(KeyEvent e) {digitalText2_keyReleased(e);}});digitalText2.addKeyListener(new java.awt.event.KeyAdapter() {public void keyPressed(KeyEvent e) {digitalText2_keyPressed(e);}});// 设置第三个输入框属性digitalText3.setBounds(new Rectangle(72, 2, 30, 22));digitalText3.setBorder(border);digitalText3.setHorizontalAlignment(SwingConstants.CENTER);digitalText3.setMaxLength(3);digitalText3.setMaxValue(255);digitalText3.setValue(255);digitalText3.addKeyListener(new java.awt.event.KeyAdapter() {public void keyReleased(KeyEvent e) {digitalText3_keyReleased(e);}});digitalText3.addKeyListener(new java.awt.event.KeyAdapter() {public void keyPressed(KeyEvent e) {digitalText3_keyPressed(e);}});// 设置第四个输入框属性digitalText4.setBounds(new Rectangle(107, 2, 30, 22));digitalText4.setBorder(border);digitalText4.setHorizontalAlignment(SwingConstants.CENTER);digitalText4.setMaxLength(3);digitalText4.setMaxValue(255);digitalText4.setValue(255);digitalText4.addKeyListener(new java.awt.event.KeyAdapter() {public void keyReleased(KeyEvent e) {digitalText4_keyReleased(e);}});digitalText4.addKeyListener(new java.awt.event.KeyAdapter() {public void keyPressed(KeyEvent e) {digitalText4_keyPressed(e);}});jLabel1.setBounds(new Rectangle(30, 2, 8, 22));jLabel1.setBackground(Color.white);jLabel1.setFont(new java.awt.Font("Dialog", 0, 13)); // 设置"."的字体jLabel1.setForeground(Color.black);jLabel1.setOpaque(true);jLabel1.setHorizontalAlignment(SwingConstants.CENTER);jLabel1.setText(".");jLabel2.setBounds(new Rectangle(65, 2, 8, 22));jLabel2.setText(".");jLabel2.setForeground(Color.black);jLabel2.setOpaque(true);jLabel2.setHorizontalAlignment(SwingConstants.CENTER);jLabel2.setHorizontalTextPosition(SwingConstants.CENTER);jLabel2.setFont(new java.awt.Font("Dialog", 0, 13));jLabel2.setBackground(Color.white);jLabel3.setBounds(new Rectangle(100, 2, 8, 22));jLabel3.setText(".");jLabel3.setForeground(Color.black);jLabel3.setOpaque(true);jLabel3.setHorizontalAlignment(SwingConstants.CENTER);jLabel3.setFont(new java.awt.Font("Dialog", 0, 13));jLabel3.setBackground(Color.white);this.add(digitalText1);this.add(jLabel1);this.add(digitalText2);this.add(jLabel2);this.add(digitalText3);this.add(jLabel3);this.add(digitalText4);this.setIpAddress("127.0.0.1"); // 默认本机IP}public void setEnabled(boolean valueSel) {if (valueSel == false) {digitalText1.setValue(0);digitalText2.setValue(0);digitalText3.setValue(0);digitalText4.setValue(0);digitalText1.setEditable(false);digitalText2.setEditable(false);digitalText3.setEditable(false);digitalText4.setEditable(false);} else {digitalText1.setEditable(true);digitalText2.setEditable(true);digitalText3.setEditable(true);digitalText4.setEditable(true);}}/** * <pre> * * Function: setIpAddress * Description: 设置IP地址 * </pre> * * @param newIpAddress * @return void * @exception void */public void setIpAddress(String newIpAddress) {// 以"/"为分割符StringTokenizer strToken = new StringTokenizer(newIpAddress, ".");String[] strIPAddress = new String[strToken.countTokens()];if (strToken.countTokens() != 4)return;// 分割IP地址串int k = 0;while (strToken.hasMoreTokens()) {strIPAddress[k] = strToken.nextToken();k++;}// 给数组赋值try {digitalText1.setValue(Integer.parseInt(strIPAddress[0]));digitalText2.setValue(Integer.parseInt(strIPAddress[1]));digitalText3.setValue(Integer.parseInt(strIPAddress[2]));digitalText4.setValue(Integer.parseInt(strIPAddress[3]));ipAddress = getIpAddress();} catch (Exception e) {return;}}public void setText(String newIpAddress) {// 以"/"为分割符StringTokenizer strToken = new StringTokenizer(newIpAddress, ".");String[] strIPAddress = new String[strToken.countTokens()];if (strToken.countTokens() != 4)return;// 分割IP地址串int k = 0;while (strToken.hasMoreTokens()) {strIPAddress[k] = strToken.nextToken();k++;}// 给数组赋值try {digitalText1.setValue(Integer.parseInt(strIPAddress[0]));digitalText2.setValue(Integer.parseInt(strIPAddress[1]));digitalText3.setValue(Integer.parseInt(strIPAddress[2]));digitalText4.setValue(Integer.parseInt(strIPAddress[3]));ipAddress = getIpAddress();} catch (Exception e) {return;}}/** * <pre> * * Function: getIpAddress * Description: 从4个输入框获取IP地址 * </pre> * * @param void * @return void * @exception void */public String getIpAddress() {ipAddress = Integer.toString(digitalText1.getValue()) + "."+ Integer.toString(digitalText2.getValue()) + "."+ Integer.toString(digitalText3.getValue()) + "."+ Integer.toString(digitalText4.getValue());return ipAddress;}public String getText() {ipAddress = Integer.toString(digitalText1.getValue()) + "."+ Integer.toString(digitalText2.getValue()) + "."+ Integer.toString(digitalText3.getValue()) + "."+ Integer.toString(digitalText4.getValue());return ipAddress;}void this_componentResized(ComponentEvent e) {this.setSize(fixedWidth, fixedHeight);validate();}public void setBounds(int l, int t, int w, int h) {super.setBounds(l, t, fixedWidth, fixedHeight);return;}/** * <pre> * * Function: digitalText1_keyReleased * Description: 输入完一个IP后，自动跳到下一个输入框并选中该输入框全部数字 * </pre> * * @param e * @return void * @exception void */void digitalText1_keyReleased(KeyEvent e) {if (e.getKeyCode() != KeyEvent.VK_LEFT&& e.getKeyCode() != KeyEvent.VK_RIGHT&& e.getKeyCode() != KeyEvent.VK_ESCAPE&& e.getKeyCode() != KeyEvent.VK_ENTER) {if (digitalText1.getText().length() >= digitalText1.getMaxLength()) {digitalText2.requestFocus();digitalText2.selectAll();}}}void digitalText1_keyPressed(KeyEvent e) {if (e.getKeyCode() == KeyEvent.VK_RIGHT) {if (digitalText1.getCaretPosition() == digitalText1.getText().length()) {digitalText2.requestFocus();digitalText2.selectAll();}}}void digitalText2_keyReleased(KeyEvent e) {if (digitalText2.getText().length() >= digitalText2.getMaxLength()) {digitalText3.requestFocus();digitalText3.selectAll();}}void digitalText2_keyPressed(KeyEvent e) {if (e.getKeyCode() == KeyEvent.VK_RIGHT) {if (digitalText2.getCaretPosition() == digitalText2.getText().length()) {digitalText3.requestFocus();digitalText3.selectAll();}}if (e.getKeyCode() == KeyEvent.VK_LEFT) {if (digitalText2.getCaretPosition() == 0) {digitalText1.requestFocus();digitalText1.selectAll();}}}void digitalText3_keyReleased(KeyEvent e) {if (digitalText3.getText().length() >= digitalText3.getMaxLength()) {digitalText4.requestFocus();digitalText4.selectAll();}}void digitalText3_keyPressed(KeyEvent e) {if (e.getKeyCode() == KeyEvent.VK_RIGHT) {if (digitalText3.getCaretPosition() == digitalText3.getText().length()) {digitalText4.requestFocus();digitalText4.selectAll();}}if (e.getKeyCode() == KeyEvent.VK_LEFT) {if (digitalText3.getCaretPosition() == 0) {digitalText2.requestFocus();digitalText2.selectAll();}}}void digitalText4_keyReleased(KeyEvent e) {if (digitalText4.getText().length() >= digitalText4.getMaxLength()) {}}void digitalText4_keyPressed(KeyEvent e) {if (digitalText4.getCaretPosition() == 0) {digitalText3.requestFocus();digitalText3.selectAll();}}class DigitalTextDocument extends PlainDocument {private JTextField JTF;public DigitalTextDocument(JTextField tmpJTF) {JTF = tmpJTF;}// 重载父类的insertString函数public void insertString(int offset, String str, AttributeSet a)throws BadLocationException {int valueAfterInsert = 0;String strBeforeInsert = getText(0, getLength());String strAfterInsert = strBeforeInsert.substring(0, offset) + str+ strBeforeInsert.substring(offset);// 首先保证插入该字符串后，是整数；如果不是，则不进行插入操作try {valueAfterInsert = Integer.parseInt(strAfterInsert);} catch (NumberFormatException e) {return;}// 如果插入字符串str后，文档超长，则插入失败if (strAfterInsert.length() > 3)return;// 如果插入后数据超出范围，插入失败，弹出警告else if (valueAfterInsert > 255) {JTF.setText("255");JOptionPane.showConfirmDialog(null,valueAfterInsert + "不是一个有效项目。请指定一个介于 0 和 255 之间的数值", "提示",JOptionPane.CLOSED_OPTION);JTF.setCaretPosition(0);} else {super.insertString(offset, str, a);return;}}}}

 

 

下面是个测试实例

package textField;import java.awt.Container;import java.awt.FlowLayout;import javax.swing.JFrame;import javax.swing.JLabel;import textField.IPAddressField;public class Test {public static void main(String[] args) {JFrame frame = new JFrame("IP输入框");Container container = frame.getContentPane();container.setLayout(new FlowLayout());JLabel ipLabel = new JLabel("IP: ");IPField ipField = new IPField();int fixedHeight = 0;int fixedWidth = 0;ipField.setSize(fixedWidth, fixedHeight);container.add(ipLabel);container.add(ipField);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setSize(300, 200);frame.setLocation(500, 300);frame.setVisible(true);}}