原文：http://blog.csdn.net/huangshulang1234/article/details/51776806

 

@Action("/getCode1")    public void getCode1() throws IOException{        // TODO Auto-generated method stub          //设置不缓存图片          response.setHeader("Pragma", "No-cache");          response.setHeader("Cache-Control", "No-cache");          response.setDateHeader("Expires", 0);          //指定生成的响应图片          response.setContentType("image/jpeg");          int width=86;           //指定生成验证码的宽度          int height=22;          //指定生成验证码的高度          BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);          Graphics g = image.getGraphics();          Graphics2D g2d = (Graphics2D)g;             //创建Graphics2D对象          Random random = new Random();          Font mFont = new Font("黑体", Font.BOLD, 16); //定义字体样式          g.setColor(getRandColor(200, 250));          g.fillRect(0, 0, width, height);        //绘制背景          g.setFont(mFont);                       //设置字体          g.setColor(getRandColor(180, 200));                              //绘制100根位置和颜色全部为随机产生的线条，该线条为2f          for (int i = 0; i < 100; i++) {              int x = random.nextInt(width-1);              int y = random.nextInt(height-1);              int x1 = random.nextInt(6)+1;              int y1 = random.nextInt(12)+1;              BasicStroke bs = new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);              Line2D line = new Line2D.Double(x,y,x+x1,y+y1);              g2d.setStroke(bs);              g2d.draw(line);             //绘制直线                        }                              //输出由英文，数字和中文随机组成的验证文字，具体的组合方式根据生成随机数确定          String sRand = "";          //输出随机的验证文字          String ctmp = "";          int itmp = 0;          for(int i = 0;i<4;i++){              //random = new Random(new java.util.Date().getTime()+i);              switch (random.nextInt(4)) {              case 1:                  itmp = random.nextInt(26)+65;               //生成A~Z的字母                  ctmp = String.valueOf((char)itmp);                                    break;                case 2://生成汉字                  String[] rBase = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};                  //生成第一位的区码                  int r1 = random.nextInt(3)+11;              //生成11~14之间的随机数                  String str_r1 = rBase[r1];                  //生成第二位的区码                  int r2;                  if(r1==13){                      r2 = random.nextInt(7);             //生成0~7之间的随数                  }else{                      r2 = random.nextInt(16);            //生成0~16之间的随机数                  }                  String str_r2 = rBase[r2];                  //生成第一位的位码                  int r3 = random.nextInt(6)+10;          //生成10~16之间的随机数                  String str_r3 = rBase[r3];                  //生成第二位的位码                  int r4;                  if(r3==10){                      r4 = random.nextInt(15)+1;          //生成1~16之间的随机数                                        }else if(r3==15){                      r4 = random.nextInt(15);            //生成0~15之间的随机数                  }else {                      r4 = random.nextInt(16);            //生成0~16之间的随机数                                                }                  String str_r4 = rBase[r4];                  //将生成的机内码转换为汉字                  byte[] bytes = new byte[2];                  //将生成的区码保存到字节数组的第一个元素中                  String str_r12 = str_r1+str_r2;                  int tempLow=Integer.parseInt(str_r12,16);                  bytes[0] = (byte)tempLow;                  //将生成的位码保存到字节数组的第二个元素中                  String str_r34 = str_r3+str_r4;                  int tempHigh = Integer.parseInt(str_r34,16);                  bytes[1] = (byte)tempHigh;                  ctmp = new String(bytes);           //根据字节数组生成汉字                  break;              default:                  itmp = random.nextInt(10)+48;       //生成0~9的数字                  ctmp = String.valueOf((char)itmp);                  break;              }              sRand+=ctmp;              Color color = new Color(20+random.nextInt(110), 20+random.nextInt(110), 20+random.nextInt(110));              g.setColor(color);                            //将生成的随机数进行随机缩放病旋转指定角度              //将文字旋转指定角度              Graphics2D g2d_word = (Graphics2D)g;              AffineTransform trans = new AffineTransform();              trans.rotate(random.nextInt(45)*3.14/180,15*i+8,7);              //缩放文字              float scaleSize = random.nextFloat()+0.8f;              if(scaleSize>1f){                  scaleSize = 1f;              }              trans.scale(scaleSize, scaleSize);              g2d_word.setTransform(trans);              g.drawString(ctmp, 15*i+18, 14);          }                    //将生成的验证码保存道session中          HttpSession session = request.getSession(true);          session.setAttribute("randCheckCode", sRand);                    //输出生成的验证码图片          g.dispose();          ImageIO.write(image, "JPEG", response.getOutputStream());      }          public Color getRandColor(int s,int e){          Random random = new Random();          if(s>255)s = 255;          if(e>255)e = 255;          int r = s+random.nextInt(e-s);          int g = s+random.nextInt(e-s);          int b = s+random.nextInt(e-s);          return new Color(r, g, b);      }