1  package util;
 2  
 3 import javax.imageio.ImageIO;
 4 import java.awt.*;
 5 import java.awt.image.BufferedImage;
 6 import java.io.File;
 7 import java.io.IOException;
 8 import java.util.Random;
 9  
10 public class image {
11     public static int[] ran() {
12         //設置圖片寬度和高度
13         int
 
 width = 150;
14         int height = 60;
15         //幹擾線條數
16         int lines = 10;
17 //        驗證碼數組
18         int[] random = new int[4];
19         Random r = new Random();
20         BufferedImage b = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
21         Graphics g = b.getGraphics();
 
22         g.setFont(new Font("宋體", Font.BOLD, 30));
23         for (int i = 0; i < 4; i++) {
24             int number = r.nextInt(10);
25             random[i] = number;
26             int y = 10+r.nextInt(40);// 10~40範圍內的一個整數，作為y坐標
27             //隨機顏色，RGB模式
28             Color c = new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255));
 
29             g.setColor(c);
30 //            g.drawString("" + a, 5 + i * width / 4, y);
31             //寫驗證碼
32             g.drawString(Integer.toString(number), 5 + i * width / 4, y);
33         }
34         for (int i = 0; i < lines; i++) {
35             //設置幹擾線顏色
36             Color c = new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255));
37             g.setColor(c);
38             g.drawLine(r.nextInt(width), r.nextInt(height), r.nextInt(width), r.nextInt(height));
39         }
40         try {
41             //清空緩沖
42             g.dispose();
43             //向文件中寫入
44             ImageIO.write(b, "jpg", new File("E:\\IntelliJ IDEA\\mail\\web\\imagecode\\test.jpg"));
45         } catch (IOException e) {
46             e.printStackTrace();
47         }
48         return random;
49     }
50  
51     //測試
52     public static void main(String[] args) {
53         ran();
54     }
55 } 

生成圖片驗證碼