代碼如下：

import javax.swing.*;import java.awt.*;import java.awt.image.BufferedImage;import java.util.Random;public class Text extends JFrame { private static final int WIDTH=300;//窗口的寬度 private static final int HEIGHT=400;//窗口的高度 private static final int LINES=120;//內部的線條數量 private static final int SPACE=10;//線條與線條之間的間距 private static JFrame jFrame=null; public static void main(String[] args) {initialize(); } private static void initialize(){//初始化窗口jFrame=new JFrame('條形碼');jFrame.setSize(WIDTH,HEIGHT);jFrame.setLayout(null);JLabel jLabel=new JLabel();jLabel.setBounds(0,0,WIDTH,80);jLabel.setIcon(new ImageIcon(setCode()));jFrame.add(jLabel);jFrame.setVisible(true);jFrame.setLocationRelativeTo(null);jFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); } private static BufferedImage setCode() {Random random = new Random();BufferedImage bufferedImage = new BufferedImage(WIDTH, 80, BufferedImage.TYPE_INT_RGB);//創建一個圖片畫板Graphics g = bufferedImage.getGraphics();//得到畫筆g.setColor(Color.white);//設置畫筆顏色g.fillRect(0, 0, WIDTH, 80);//規定畫筆的一個范圍g.setColor(Color.black);//這個是設置線條的顏色for(int i=0;i<LINES;i++){ int row=random.nextInt(WIDTH)+SPACE; g.drawLine(row,0,row,HEIGHT);}return bufferedImage; }}

效果如下：

代碼如下：

import javax.swing.*;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.MouseAdapter;import java.awt.event.MouseEvent;import java.awt.image.BufferedImage;import java.util.Random;public class Text extends JFrame{ private final static char[] words=('1234567890' + 'abcdefghijklmnopqrstuvwxyz' + 'ABCDEFGHIJKLMNOPQRSTUVWXYZ').toCharArray(); private final static int WORDLENGTH=4; private final static int WIDTH=200; private final static int HEIGHT=100; private final static int STAR=200; private static Text t=null; private static TextField textFile=null; private static Object[] obj=null; private static Object[] drawCode(){BufferedImage bufferedImage=new BufferedImage(WIDTH,HEIGHT,BufferedImage.TYPE_INT_RGB);Graphics g=bufferedImage.getGraphics();char[] selectWord=new char[4];g.setColor(Color.LIGHT_GRAY);g.fillRect(0,0,WIDTH,HEIGHT);Random random=new Random();for(int i=0;i<WORDLENGTH;i++){ int n=random.nextInt(words.length); selectWord[i]=words[i]; g.setFont(new Font('微軟雅黑',0,random.nextInt(20)+40)); g.setColor(setRandomColor()); g.drawString(words[n]+'',i*WIDTH/WORDLENGTH,HEIGHT/2+10);}for(int i=0;i<STAR;i++){ g.setColor(setRandomColor()); g.setFont(new Font('楷書',0,40)); g.drawOval(random.nextInt(WIDTH),random.nextInt(HEIGHT),3, 3);}return new Object[]{selectWord,bufferedImage}; } private static Color setRandomColor(){Random colorRandom=new Random();return new Color(colorRandom.nextInt(256),colorRandom.nextInt(256),colorRandom.nextInt(256)); } public static void main(String[] args) {t=new Text();t.setLocationRelativeTo(null);t.setSize(WIDTH,200);t.setLayout(null);t.add(setLabel());t.add(setButton());t.add(setTextField());t.setVisible(true);t.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); }private static JLabel setLabel(){JLabel jLabel=new JLabel();obj=drawCode();jLabel.setIcon(new ImageIcon((BufferedImage)obj[1]));jLabel.setBounds(0,0,WIDTH,HEIGHT);jLabel.addMouseListener(new MouseAdapter() { @Override public void mouseClicked(MouseEvent e) {jLabel.setIcon(new ImageIcon((BufferedImage)drawCode()[1])); }});return jLabel; } private static TextField setTextField(){textFile=new TextField();textFile.setFont(new Font('華文行楷',0,20));textFile.setBounds(5,120, 100,30);return textFile; } private static JButton setButton(){JButton jButton=new JButton('檢測');jButton.setBounds(110,120, 70,30);jButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) {System.out.println(textFile.getText().equals(obj[0])); }});return jButton; }}

效果如下：

驗證碼這里是因為沒有設置好字符編碼的原因，讓中文字符無法在窗口內不顯示

驗證碼就比條形碼難以點點，但是基本的編寫思想都是差不多的，但最難的還是在二維碼上，編寫二維碼就需要要求編寫者的算法能力足夠的扎實，而且還要有足夠豐富的Java功底

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