1 //设置响应头 2 response.setCharacterEncoding("image/jpeg"); 3 int width=160; 4 int height=40; 5 BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 6 Graphics g=image.getGraphics(); 7 Graphics2D g2d = (Graphics2D) g; 8 g2d.setColor(Color.WHITE); 9 g2d.fillRect(0, 0, width, height); 10 g2d.setFont(new Font("宋体", Font.BOLD, 18)); 11 Random random=new Random(); 12 for(int i=0;i<4;i++)//获取随机四个汉字 13 { 14 Color c=new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)); 15 String s=GetStr(); 16 17 AffineTransform aff = new AffineTransform(); 18 aff.rotate(Math.random(),i*10,height-20);//旋转 19 aff.scale(0.2+Math.random(), 0.2+Math.random());//缩放 20 g2d.setTransform(aff); 21 System.err.println(">:"+s); 22 23 g2d.setColor(c); 24 g2d.drawString(s, i*10, height- 5); 25 } 26 27 for(int i=0;i<3;i++) //干扰线 28 { 29 Color c=new Color(random.nextInt(256), random.nextInt(256), random.nextInt(256)); 30 g2d.setColor(c); 31 g2d.drawLine(random.nextInt(width), random.nextInt(height), random.nextInt(width), random.nextInt(height)); 32 33 } 34 g2d.dispose();//图片生效 35 ImageIO.write(image, "jpeg", response.getOutputStream());//输出 36 System.out.println("输出"); 37 } 38 39 //获取汉字 40 private static String GetStr() 41 { 42 String str = null; 43 try { 44 45 int hightPos, lowPos; // 定义高低位 46 Random random = new Random(); 47 hightPos = (176 + Math.abs(random.nextInt(39)));//获取高位值 48 lowPos = (161 + Math.abs(random.nextInt(93)));//获取低位值 49 byte[] b = new byte[2]; 50 b[0] = (new Integer(hightPos).byteValue()); 51 b[1] = (new Integer(lowPos).byteValue()); 52 str = new String(b, "GBK");//转成中文 53 54 } catch (Exception e) { 55 e.printStackTrace(); 56 } 57 return str; 58 59 }
PS：写验证码不能把所有的都用上，这样就无法识别了，可以选择其中的几种进行，如写汉字只加干扰线，写字母加旋转等。