Java 生成滑动图片验证码, 阴影, 切块

1, 效果

图片都是280x210

2, 切图工具

import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.imageio.stream.ImageInputStream;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.awt.image.ConvolveOp;
import java.awt.image.Kernel;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Iterator;public class ImageUtil {public static void cut(int x,int y,int width,int height,String srcpath,String subpath) throws IOException {//裁剪方法FileInputStream is=null;ImageInputStream iis=null;try{is=new FileInputStream(srcpath); //读取原始图片Iterator<ImageReader>it=ImageIO.getImageReadersByFormatName("jpg"); //ImageReader声称能够解码指定格式ImageReader reader=it.next();iis=ImageIO.createImageInputStream(is); //获取图片流reader.setInput(iis, true); //将iis标记为true（只向前搜索）意味着包含在输入源中的图像将只按顺序读取ImageReadParam param=reader.getDefaultReadParam(); //指定如何在输入时从 Java Image I/O框架的上下文中的流转换一幅图像或一组图像Rectangle rect=new Rectangle(x, y, width, height); //定义空间中的一个区域param.setSourceRegion(rect); //提供一个 BufferedImage，将其用作解码像素数据的目标。BufferedImage bi=reader.read(0, param); //读取索引imageIndex指定的对象ImageIO.write(bi, "jpg", new File(subpath)); //保存新图片}finally{if(is!= null)is.close();if(iis != null)iis.close();}}public void cutByTemplate2(BufferedImage oriImage,BufferedImage newSrc,BufferedImage newSrc2,int x,int y,int width,int height, int c_a, int c2_b){//固定圆半径为5int c_r=10;double rr=Math.pow(c_r, 2);//r平方//圆心的位置 cb//System.out.println(c_a);int c_b=y;//第二个圆（排除圆内的点） c2_aint c2_a=x;//System.out.println(oriImage.getWidth()+"   "+oriImage.getHeight());for(int i=0;i<oriImage.getWidth();i++){for(int j=0;j<oriImage.getHeight();j++){//data[i][j]=oriImage.getRGB(i,j);//(x-a)²+(y-b)²=r²中，有三个参数a、b、r，即圆心坐标为(a，b)，半径r。double f=Math.pow((i-c_a), 2)+Math.pow((j-c_b), 2);double f2=Math.pow((i-c2_a), 2)+Math.pow((j-c2_b), 2);int rgb=oriImage.getRGB(i,j);if(i>=x&&i<(x+width) &&j>=y&&j<(y+height) && f2>=rr){//在矩形内//块范围内的值in(newSrc, newSrc2, i, j, rgb);}else if(f<=rr){//在圆内in(newSrc, newSrc2, i, j, rgb);}else{//剩余位置设置成透明out(newSrc, newSrc2, i, j, rgb);}}}}private void in(BufferedImage newSrc,BufferedImage newSrc2,int i,int j,int rgb){newSrc.setRGB(i, j, rgb);//原图设置变灰int r = (0xff & rgb);int g = (0xff & (rgb >> 8));int b = (0xff & (rgb >> 16));rgb = r + (g << 8) + (b << 16) + (100 << 24);//rgb = r + (g << 8) + (b << 16);newSrc2.setRGB(i, j, rgb);newSrc.setRGB(i + 1, j + 1, rgb);}private void out(BufferedImage newSrc,BufferedImage newSrc2,int i,int j,int rgb){newSrc.setRGB(i, j, 0x00ffffff);newSrc2.setRGB(i, j, rgb);}public static BufferedImage createDropShadow(BufferedImage image,int size, float opacity) {int width = image.getWidth() + size * 2;int height = image.getHeight() + size * 2;BufferedImage mask = new BufferedImage(width, height,BufferedImage.TYPE_INT_ARGB);Graphics2D g2 = mask.createGraphics();g2.drawImage(image, size, size, null);g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_IN,opacity));g2.setColor(Color.BLACK);g2.fillRect(0, 0, width, height);g2.dispose();BufferedImage shadow = createBlurOp(size).filter(mask, null);g2 = shadow.createGraphics();g2.dispose();return shadow;}private static ConvolveOp createBlurOp(int size) {float[] data = new float[size * size];float value = 1f / (float) (size * size);for (int i = 0; i < data.length; i++) {data[i] = value;}return new ConvolveOp(new Kernel(size, size, data),ConvolveOp.EDGE_NO_OP, null);}
}

3, 生成背景图

x就是验证码, x 轴的偏移量, 验证就是需要这个

@GetMapping("/xcode")public Result getXCode1(HttpServletResponse resp, HttpServletRequest request) throws IOException {ImageUtil tt = new ImageUtil();// 随机选择背景图int num = new Random().nextInt(10) + 1;InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("xcode/" + num + ".jpg");BufferedImage src= ImageIO.read(resourceAsStream);//移动图BufferedImage newSrc=new BufferedImage(src.getWidth(), src.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage//对比图BufferedImage newSrc2=new BufferedImage(src.getWidth(), src.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage//抠块的大小int blockWidth=48;int blockHeight=48;// 用于生成 移动图XCodeTdo code = new XCodeTdo();code.setNum(num);Random rand1=new Random();int x=rand1.nextInt(src.getWidth()-blockWidth-20)+20;//10,width-200if (x > 210 - 58) {x = 210 - 58;}Random rand2=new Random();int y=rand2.nextInt(src.getHeight()-blockHeight-20)+20;//code.setX(x);code.setY(y);int ca = new Random().nextInt(blockWidth-2*20)+(x+20);int cb = new Random().nextInt(blockHeight-2*20)+(y+20);code.setCa(ca);code.setCb(cb);tt.cutByTemplate2(src,newSrc,newSrc2,x,y,blockWidth,blockHeight, ca, cb);//图片大小是固定，位置是随机request.getSession().setAttribute("X_CODE", JSON.toJSONString(code));//生成对比图ImageIO.write(newSrc2, "png", resp.getOutputStream());return null;}

4, 生成区块图

@GetMapping("/xcodem")public Result getXCode2(HttpServletResponse resp, HttpServletRequest request) throws IOException {ImageUtil tt = new ImageUtil();Object o = request.getSession().getAttribute("X_CODE");if (o == null) {return new Result();}XCodeTdo codeTdo = JSON.parseObject(String.valueOf(o), XCodeTdo.class);int num = codeTdo.getNum();InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("xcode/" + num + ".jpg");BufferedImage src= ImageIO.read(resourceAsStream);//移动图BufferedImage newSrc=new BufferedImage(src.getWidth(), src.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage//对比图BufferedImage newSrc2=new BufferedImage(src.getWidth(), src.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage//抠块的大小int x= codeTdo.getX();int y= codeTdo.getY();tt.cutByTemplate2(src,newSrc,newSrc2,x,y,48,48, codeTdo.getCa(), codeTdo.getCb());//图片大小是固定，位置是随机newSrc = newSrc.getSubimage(x - 1, 0, 58, 210);//ImageUtil.createDropShadow(newSrc, 3, 0.08f);//生成对比图ImageIO.write(newSrc, "png", resp.getOutputStream());return null;}

5, 阴影图

@GetMapping("/xcodey")public void getXCode3(HttpServletResponse resp, HttpServletRequest request) throws IOException {ImageUtil tt = new ImageUtil();Object o = request.getSession().getAttribute("X_CODE");if (o == null) {return;}XCodeTdo codeTdo = JSON.parseObject(String.valueOf(o), XCodeTdo.class);int num = codeTdo.getNum();InputStream resourceAsStream = this.getClass().getClassLoader().getResourceAsStream("xcode/" + num + ".jpg");BufferedImage src= ImageIO.read(resourceAsStream);//移动图BufferedImage newSrc=new BufferedImage(src.getWidth(), src.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage//对比图BufferedImage newSrc2=new BufferedImage(src.getWidth(), src.getHeight(),BufferedImage.TYPE_4BYTE_ABGR);//新建一个类型支持透明的BufferedImage//抠块的大小int x= codeTdo.getX();int y= codeTdo.getY();tt.cutByTemplate2(src,newSrc,newSrc2,x,y,48,48, codeTdo.getCa(), codeTdo.getCb());//图片大小是固定，位置是随机newSrc = newSrc.getSubimage(x - 1, 0, 48, 210);newSrc = ImageUtil.createDropShadow(newSrc, 4, 0.6f);//生成对比图ImageIO.write(newSrc, "png", resp.getOutputStream());}

public class XCodeTdo {private int num;private int x;private int y;private int ca;private int cb;public int getNum() {return num;}public void setNum(int num) {this.num = num;}public int getX() {return x;}public void setX(int x) {this.x = x;}public int getY() {return y;}public void setY(int y) {this.y = y;}public int getCa() {return ca;}public void setCa(int ca) {this.ca = ca;}public int getCb() {return cb;}public void setCb(int cb) {this.cb = cb;}
}

4, 怎么验证?

前端需要传 x 轴的偏移量, 与第一次生成的背景图保存在session 中的 X_CODE, 中的x进行比较值

@RequestMapping(value = "/login", method = RequestMethod.POST)@ResponseBodypublic Object loginVali(HttpServletRequest request) {String username = super.getPara("username").trim();String password = super.getPara("password").trim();String xcode= super.getPara("xcode");int token = Integer.parseInt(xcode);Object obj = request.getSession().getAttribute("X_CODE");XCodeTdo codeTdo = JSON.parseObject(String.valueOf(obj), XCodeTdo.class);// 这里 / 2.1 是因为前端的滑动器值是100int x = (int) (codeTdo.getX() / 2.1);// 预留了正负6 * 2.1 = 13的像素的偏差if (token > x + 3 || token < x - 3) {// 删除验证记录request.getSession().removeAttribute("X_CODE");return new SuccessTip(400,"验证码错误!",null);}return new SuccessTip(200,"登录成功!",null);}

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Java 生成滑动图片验证码, 阴影, 切块

1, 效果

2, 切图工具

3, 生成背景图

4, 生成区块图

5, 阴影图

4, 怎么验证?

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