Java实现滑动验证码的示例代码

 private int[][] getBlockData() {
 int[][] data = new int[targetLength][targetWidth];
 double x2 = targetLength-circleR-2;
 //随机生成圆的位置
 double h1 = circleR + Math.random() * (targetWidth-3*circleR-r1);
 double po = circleR*circleR;
 
 double xbegin = targetLength-circleR-r1;
 double ybegin = targetWidth-circleR-r1;
 
 for (int i = 0; i < targetLength; i++) {
  for (int j = 0; j < targetWidth; j++) {
  //右边○
  double d3 = Math.pow(i - x2,2) + Math.pow(j - h1,2);
  
  if (d1 <= po
   || (j >= ybegin && d2 >= po)
   || (i >= xbegin && d3 >= po)
   ) {
   data[i][j] = 0;
   
  } else {
   data[i][j] = 1;
  }
  }
 }
 return data;
 }

private void cutByTemplate(BufferedImage oriImage,BufferedImage targetImage, int[][] templateImage, int x,
  int y){
 for (int i = 0; i < targetLength; i++) {
  for (int j = 0; j < targetWidth; j++) {
  int rgb = templateImage[i][j];
  // 原图中对应位置变色处理
  
  int rgb_ori = oriImage.getRGB(x + i, y + j);
  
  if (rgb == 1) {
          //抠图上复制对应颜色值
   targetImage.setRGB(i, y + j, rgb_ori);
   int r = (0xff & rgb_ori);
   int g = (0xff & (rgb_ori >> 8));
   int b = (0xff & (rgb_ori >> 16)));
   rgb_ori = r + (g << 8) + (b << 16) + (200 << 24);
          //原图对应位置颜色变化
   oriImage.setRGB(x + i, y + j, rgb_ori);
  } 
  }
 }
 }

public static ConvolveOp getGaussianBlurFilter(int radius,
      boolean horizontal) {
    if (radius < 1) {
      throw new IllegalArgumentException("Radius must be >= 1");
    }
    
    int size = radius * 2 + 1;
    float[] data = new float[size];
    
    float sigma = radius / 3.0f;
    float twoSigmaSquare = 2.0f * sigma * sigma;
    float sigmaRoot = (float) Math.sqrt(twoSigmaSquare * Math.PI);
    float total = 0.0f;
    
    for (int i = -radius; i <= radius; i++) {
      float distance = i * i;
      int index = i + radius;
      data[index] = (float) Math.exp(-distance / twoSigmaSquare) / sigmaRoot;
      total += data[index];
    }
    
    for (int i = 0; i < data.length; i++) {
      data[i] /= total;
    }    
    
    Kernel kernel = null;
    if (horizontal) {
      kernel = new Kernel(size, 1, data);
    } else {
      kernel = new Kernel(1, size, data);
    }
    return new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
  }

public static void simpleBlur(BufferedImage src,BufferedImage dest) {
   BufferedImageOp op = getGaussianBlurFilter(2,false);
   op.filter(src, dest);
 }

public static byte[] fromBufferedImage2(BufferedImage img,String imagType) throws IOException {
 bos.reset();
 // 得到指定Format图片的writer
 Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName(imagType);
 ImageWriter writer = (ImageWriter) iter.next(); 

 // 得到指定writer的输出参数设置(ImageWriteParam )
 ImageWriteParam iwp = writer.getDefaultWriteParam();
 iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); // 设置可否压缩
 iwp.setCompressionQuality(1f); // 设置压缩质量参数

 iwp.setProgressiveMode(ImageWriteParam.MODE_DISABLED);

 ColorModel colorModel = ColorModel.getRGBdefault();
 // 指定压缩时使用的色彩模式
 iwp.setDestinationType(new javax.imageio.ImageTypeSpecifier(colorModel,
 colorModel.createCompatibleSampleModel(16, 16)));
 
 writer.setOutput(ImageIO
 .createImageOutputStream(bos));
 IIOImage iIamge = new IIOImage(img, null, null);
 writer.write(null, iIamge, iwp);
 
 byte[] d = bos.toByteArray();
 return d;
 }