本文转载自:https://blog.csdn.net/huitoukest/article/details/49781431
- public class VerificationCode {
- Random rand = new Random();
- /**
- * 随机产生的加数和被加数
- */
- private int jiashu=0;
- private int beijiashu=0;
- /**
- * 随机产生的计算方式,0表示加,1表示减
- */
- private int js=0;
- private char[] aa={'零','壹','贰','叁','肆','伍','陆','柒','捌','玖'};
- private char[] action={'加','减'};
- private char[] jieguo={'等','是'};
- public static void main(String[] args) {
- VerificationCode code=new VerificationCode();
- JFrame jFrame=new JFrame();
- jFrame.setBounds(400, 400, 250, 250);
- ImageIcon img = new ImageIcon(code.getVerificationCode2());
- JLabel background = new JLabel(img);
- jFrame.add(background);
- jFrame.setVisible(true);
- jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
- }
- /**
- * 第二种验证码的计算方式,两位数的加减法
- * @return 一个新的验证码图片
- */
- public BufferedImage getVerificationCode2()
- {
- int width=200;
- int height=100;
- int degree=0;//继续一共旋转的角度,方便最后的时候旋转回来
- BufferedImage image = new BufferedImage(width, height,
- BufferedImage.TYPE_4BYTE_ABGR);
- // 获取图形上下文
- Graphics g = image.getGraphics();
- //画随机干扰框
- setSquareBackGround(g,width,height,5);
- //画干扰点
- //CreateRandomPoint(width, height,50,g,255);
- //随机画几条线
- // CreateRandomLine(width, height,2,g,255);
- // 设定背景色
- Color background=getColor(180);
- g.setColor(background);
- g.fillRect(0, 0, width, height);
- //画边框
- g.setColor(background);
- g.drawRect(0,0,width-1,height-1);
- // 将认证码显示到图像中,如果要生成更多位的认证码
- char[] content=getDrawContent2();
- int[] xs=getRadonWidths(width,content.length);
- int[] ys=getRadomHeights(height,content.length);
- for(int i=0;i<content.length;i++)
- { String s=content[i]+"";
- if(content[i]=='!')
- s="";
- //如果在画字之前旋转图片
- if(i!=2){
- int maxDegree=rand.nextInt(2);
- if(maxDegree==0)
- maxDegree=0;
- else maxDegree=305;
- degree=rand.nextInt(45)+maxDegree;
- } else degree=0;
- g.setColor(getColor(background,230));
- if(i==2)//运算符号显示大一些
- g.setFont(new Font("Atlantic Inline",Font.PLAIN,getIntRandom(22,25)));
- else
- g.setFont(new Font("Atlantic Inline",Font.PLAIN,getIntRandom(20,23)));
- RotateString(s, xs[i], ys[i], g, degree);
- }
- //画随机干扰框
- setSquareBackGround(g,width,height,3);
- //画干扰点
- CreateRandomPoint(width, height,100,g,100);
- //随机画几条线
- CreateRandomLine(width, height,8,g,100);
- // 释放图形上下文
- g.dispose();
- System.out.println("计算的结果是="+getResult2());
- return image;
- }
- /**
- * 旋转并且画出指定字符串
- * @param s 需要旋转的字符串
- * @param x 字符串的x坐标
- * @param y 字符串的Y坐标
- * @param g 画笔g
- * @param degree 旋转的角度
- */
- private void RotateString(String s,int x,int y,Graphics g,int degree)
- {
- Graphics2D g2d = (Graphics2D) g.create();
- // 平移原点到图形环境的中心 ,这个方法的作用实际上就是将字符串移动到某一个位置
- //g2d.translate(x-1, y+3);
- g2d.translate(getIntRandom(x, x+2), getIntRandom(y,y+2));
- // 旋转文本
- g2d.rotate(degree* Math.PI / 180);
- //特别需要注意的是,这里的画笔已经具有了上次指定的一个位置,所以这里指定的其实是一个相对位置
- g2d.drawString(s,0 , 0);
- }
- /**
- * 随机产生干扰点
- * @param width
- * @param height
- * @param many
- * @param g
- * @param alpha 透明度0~255 0表示全透
- */
- private void CreateRandomPoint(int width,int height,int many,Graphics g,int alpha)
- { // 随机产生干扰点
- for (int i=0;i<many;i++) {
- int x = rand.nextInt(width);
- int y = rand.nextInt(height);
- g.setColor(getColor(alpha));
- g.drawOval(x,y,rand.nextInt(3),rand.nextInt(3));
- }
- }
- /**
- * 随机产生干扰线条
- * @param width
- * @param height
- * @param minMany 最少产生的数量
- * @param g
- * @param alpha 透明度0~255 0表示全透
- */
- private void CreateRandomLine(int width,int height,int minMany,Graphics g,int alpha)
- { // 随机产生干扰线条
- for (int i=0;i<getIntRandom(minMany, minMany+6);i++) {
- int x1 =getIntRandom(0,(int)(width*0.6));
- int y1 =getIntRandom(0,(int)(height*0.6));
- int x2 =getIntRandom((int)(width*0.4),width);
- int y2 =getIntRandom((int)(height*0.2),height);
- g.setColor(getColor(alpha));
- g.drawLine(x1, y1, x2, y2);
- }
- }
- /**
- * 由随机产生的方块来作为干扰背景
- */
- private void setSquareBackGround(Graphics g,int width,int height,int count){
- // 随机产生干扰线条
- for (int i=0;i<getIntRandom(count, count+2);i++) {
- int x1 =getIntRandom(0,(int)(width*0.3));
- int y1 =getIntRandom(0,(int)(height*0.3));
- int x2 =getIntRandom((int)(width*0.5),width);
- int y2 =getIntRandom((int)(height*0.55),height);
- g.setColor(getColor(100));
- int w=x2-x1;
- int h=y2-y1;
- if(w<0) w=-w;
- if(h<0) h=-h;
- g.drawRect(x1, y1, w, h);
- g.setColor(getColor(25));
- g.fillRect(x1, y1, w, h);
- }
- }
- /***
- * @return 随机返一个指定区间的数字
- */
- private int getIntRandom(int start,int end)
- { if(end<start)
- {
- int t=end;
- end=start;
- start=t;
- }
- int i=start+(int) (Math.random()*(end-start));
- return i;
- }
- @SuppressWarnings("unused")
- private int getIntRandom(double start,double end)
- { if(end<start)
- {
- double t=end;
- end=start;
- start=t;
- }
- double i=start+(int) (Math.random()*(end-start));
- return (int)i;
- }
- /*** 随机返回一种颜色,透明度0~255 0表示全透
- * @return 随机返回一种颜色
- * @param alpha 透明度0~255 0表示全透
- */
- private Color getColor(int alpha)
- {
- int R=(int) (Math.random()*255);
- int G=(int) (Math.random()*255);
- int B=(int) (Math.random()*255);
- return new Color(R,G,B,alpha);
- }
- /***
- * @return 随机返回一种颜色,与给定颜色相类似
- * @param alpha 透明度0~255 0表示全透
- */
- private Color getColor(Color c,int alpha)
- {
- int R=getIntRandom(-140,140);
- int G=getIntRandom(-140,140);
- int B=getIntRandom(-140,140);
- R=getCloserRandom(c.getRed(),R);
- B=getCloserRandom(c.getBlue(),B);
- G=getCloserRandom(c.getGreen(),G);
- return new Color(R,G,B,alpha);
- }
- /**
- * 在颜色值和给定的随机数之间返回一个随机颜色值0~255
- * @param colorValue
- * @param randomValue
- * @param deep,默认为0
- * @return
- */
- @SuppressWarnings("unused")
- private int getCloserRandom(int colorValue,int randomValue){
- if(colorValue+randomValue>255)
- {
- return getCloserRandom(colorValue,randomValue-getIntRandom(1, randomValue+20));
- }else if(colorValue+randomValue<0){
- return getCloserRandom(colorValue,randomValue+getIntRandom(1, randomValue+20));
- }else if(Math.abs(randomValue)<60)
- {
- return getCloserRandom(colorValue,getIntRandom(-255,255));
- }else{
- return colorValue+randomValue;
- }
- }
- /**
- *
- * @return 返回getVerificationCode2需要画出的内容:两位数加减法字符数组
- */
- private char[] getDrawContent2()
- { beijiashu=0;
- jiashu=0;
- char[] temp=new char[6];
- char[] w =aa;
- int k=0;
- /**
- * 产生被加数
- */
- //从aa\bb\cc中选择一个字符数组作为素材
- k=(int)(Math.random()*4);
- w=aa;
- k=(int)(Math.random()*10);
- temp[0]=w[k];
- if(k==0) temp[0]='!';
- beijiashu+=k*10;
- k=(int)(Math.random()*10);
- temp[1]=w[k];
- beijiashu+=k;
- /**
- * 产生加数
- */
- k=(int)(Math.random()*2);
- w=aa;
- k=(int)(Math.random()*10);
- temp[3]=w[k];
- if(k==0) temp[3]='!';
- jiashu=k*10+jiashu;
- k=(int)(Math.random()*10);
- temp[4]=w[k];
- jiashu+=k;
- //选择加减乘除
- w=action;
- k=(int)(Math.random()*2 );
- temp[2]=w[k];
- js=k%2;
- //结果
- w=jieguo;
- k=(int)(Math.random()*2);
- temp[5]=w[k];
- return temp;
- }
- /**
- * 对图片选择,这里保留以方便以后使用
- * @param bufferedimage
- * @param degree
- * @return 一张旋转后的图片
- */
- public BufferedImage rolateImage(BufferedImage bufferedimage,int degree,Color backGround)
- {
- BufferedImage img;
- int w = bufferedimage.getWidth();
- int h = bufferedimage.getHeight();
- int type = BufferedImage.TYPE_INT_RGB;
- Graphics2D graphics2d;
- graphics2d = (img = new BufferedImage(w, h, type)).createGraphics();
- graphics2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
- RenderingHints.VALUE_INTERPOLATION_BICUBIC);
- graphics2d.rotate(Math.toRadians(degree), w / 2, h / 2);
- graphics2d.drawImage(bufferedimage,null, null);
- return img;
- }
- /**
- * 得到验证码getVerificationCode2,计算出来的结果
- */
- public int getResult2()
- { if(js==0)
- return(beijiashu+jiashu);
- else if(js==1) return (beijiashu-jiashu);
- return 0;
- }
- /**
- *
- * @param many
- * @return 画图的时候随机的高度的数组
- */
- private int[] getRadomHeights(int height,int many){
- int[] temp=new int[many];
- for(int i=0;i<many;i++){
- temp[i]=getRadomHeight(height);
- }
- return temp;
- }
- /**
- *
- * @param many
- * @return 画图的时候起始x坐标的数组
- */
- private int[] getRadonWidths(int width,int many)
- { int[] temp=new int[many];
- for(int i=0;i<many;i++){
- if(i==0)
- temp[i]=getRadonWidth(many,0,width);
- else temp[i]=getRadonWidth(many,temp[i-1],width);
- }
- return temp;
- }
- private int getRadomHeight(int fullHeight)
- {
- return getIntRandom((int)(fullHeight*0.2), (int)(fullHeight*0.75));
- }
- private int getRadonWidth(int many,int minWidth, int maxWidth)
- {
- int minJianju=maxWidth/(many+2);
- int maxJianju=maxWidth/(many);
- int temp=maxJianju-minJianju;
- //在的规定的范围内产生一个随机数
- return (int)(Math.random()*temp)+minWidth+minJianju;
- }
- }
说明,干扰信息,如干扰点,干扰框等待在文字和背景的前后都加入理论效果更高;
通过设置图片大小,颜色透明度,干扰数量,文字大小,旋转角度等等,可以自行下载定制;
效果图:
干扰点:
干扰框/点/线图:
不加入干扰的效果:
干扰框的图:
调整验证码大小和字体大小之后的图: