IP控件

最新推荐文章于 2023-07-10 20:18:43 发布

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本文介绍了一个使用Java Swing实现的IP地址输入面板组件。该组件能够验证用户输入的IPv4地址的有效性，并通过按钮获取或设置IP地址。此外，文章还详细介绍了组件的工作原理和实现细节。

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import java.awt.BorderLayout;

import java.awt.FlowLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.util.StringTokenizer;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

public class IpTextPanel extends JPanel{

/**

* init a IpTextPanel instance

* @param frame parent JFrame

public IpTextPanel(JFrame frame){

super();

this.frame = frame;

seg1 = new IpTextField(3,frame,1,255);

seg2 = new IpTextField(3,frame,0,255);

seg3 = new IpTextField(3,frame,0,255);

seg4 = new IpTextField(3,frame,1,255);

setLayout(new FlowLayout(FlowLayout.CENTER,3,3));

add(seg1);

add(new JLabel("."));

add(seg2);

add(new JLabel("."));

add(seg3);

add(new JLabel("."));

add(seg4);

}

/**

* set an ip address,it won't check the ip is valid or not

* @param ip address type

public void setText(String ip){

StringTokenizer st = new StringTokenizer(ip,".");

seg1.setText(st.nextToken());

seg2.setText(st.nextToken());

seg3.setText(st.nextToken());

seg4.setText(st.nextToken());

}

/**

* clear the ip address

public void clear(){

seg1.setText("");

seg2.setText("");

seg3.setText("");

seg4.setText("");

}

/**

* get the ip address content

* @return ipaddress String value

public String getText(){

if(seg1.getText().equals("")||seg2.getText().equals("")||seg3.getText().equals("")||seg4.getText().equals("")){

JOptionPane.showMessageDialog(frame,"请输入完整","WARNING",JOptionPane.WARNING_MESSAGE);

return null;

}else{

return Integer.parseInt(seg1.getText().trim())+"."+Integer.parseInt(seg2.getText().trim())+"."+Integer.parseInt(seg3.getText().trim())+"."+Integer.parseInt(seg4.getText().trim());

}

private JFrame frame = null;

private IpTextField seg1 = null;

private IpTextField seg2 = null;

private IpTextField seg3 = null;

private IpTextField seg4 = null;

public static void main(String[] args){

JFrame frame = new JFrame();

frame.getContentPane().setLayout(new BorderLayout());

final IpTextPanel pane = new IpTextPanel(frame);

frame.getContentPane().add(pane,BorderLayout.CENTER);

JPanel buttonPane = new JPanel();

JButton getText = new JButton("getText");

JButton setText = new JButton("setText");

buttonPane.setLayout(new FlowLayout(FlowLayout.CENTER,3,3));

buttonPane.add(getText);

buttonPane.add(setText);

frame.getContentPane().add(buttonPane,BorderLayout.SOUTH);

frame.setLocation(400,300);

frame.setSize(400,300);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setVisible(true);

getText.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

System.out.println(pane.getText());

}

});

setText.addActionListener(new ActionListener(){

public void actionPerformed(ActionEvent e) {

pane.setText("15.0.33.499");

//pane.clear();

}

});

}

//************************************************************************************************

import java.awt.Component;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.JTextField;

import javax.swing.text.AttributeSet;

import javax.swing.text.BadLocationException;

import javax.swing.text.PlainDocument;

public class IpTextField extends JTextField {

private int min = 0;// min value

private int max = 255;// max value

IpSegDocument document = null;

public IpTextField(int columns, JFrame frame, int min, int max) {

super(columns);

this.min = min;

this.max = max;

setDocument(document = new IpSegDocument(frame, columns, min, max));

}

public int getMax() {

return max;

}

public void setMax(int max) {

this.max = max;

if (document != null) {

document.setMax(max);

}

public int getMin() {

return min;

}

public void setMin(int min) {

this.min = min;

if (document != null) {

document.setMin(min);

}

class IpSegDocument extends PlainDocument {

private int limit;

private int min;

private int max;

Component parentComponent;

public IpSegDocument(Component parentComponent, int limit, int min, int max) {

super();

this.parentComponent = parentComponent;

this.limit = limit;

this.min = min;

this.max = max;

}

/**

* offset 输入位置 str 输入字符串.有多个输入的情况,如粘贴剪贴板中的内容 attr 总是null

public void insertString(int offset, String str, AttributeSet attr)

throws BadLocationException {

if (str == null) {

return;

}

if (((getText(0, getLength()).trim()).length() + str.length()) <= limit) {

char[] upper = str.toCharArray();

int length = 0;

for (int i = 0; i < upper.length; i++) {

if (upper[i] >= '0' && upper[i] <= '9') {

upper[length++] = upper[i];

}

String valueStr = getText(0, offset) + new String(upper, 0, length)

+ getText(offset, getLength() - offset).trim();

if (!valueStr.equals("")) {

int value = Integer.parseInt(valueStr.trim());

if (value >= min && value <= max) {

super.remove(0, getLength());

super.insertString(0, String.valueOf(value), attr);

} else {

if (parentComponent == null) {

parentComponent = JOptionPane.getRootFrame();

}

JOptionPane.showMessageDialog(parentComponent, "非法输入",

"WARNING", JOptionPane.WARNING_MESSAGE);

super.remove(0, getLength());

}

public int getLimit() {

return limit;

}

public void setLimit(int limit) {

this.limit = limit;

}

public int getMax() {

return max;

}

public void setMax(int max) {

this.max = max;

}

public int getMin() {

return min;

}

public void setMin(int min) {

this.min = min;

}