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java 生成验证码简单版

java 生成验证码简单版

作者: 烟雾袅绕 | 来源:发表于2016-07-25 16:23 被阅读244次

    1:使用springMVC方式的controller

    @RequestMapping(value="getYzm",method=RequestMethod.GET)
    
    public void getYzm(HttpServletResponse response,HttpServletRequest request){
    
     try {
    
     response.setHeader("Pragma", "No-cache"); 
    
     response.setHeader("Cache-Control", "no-cache"); 
    
     response.setDateHeader("Expires", 0); 
    
     response.setContentType("image/jpeg"); 
    
     
    
     //生成随机字串 
    
     String verifyCode = VerifyCodeUtils.generateVerifyCode(4); 
    
     //存入会话session 
    
     HttpSession session = request.getSession(true); 
    
     session.setAttribute("_code", verifyCode.toLowerCase()); 
    
     //生成图片 
    
     int w = 146, h = 33; 
    
     VerifyCodeUtils.outputImage(w, h, response.getOutputStream(), verifyCode); 
    
     } catch (Exception e) {
    
     LoggerUtils.fmtError(getClass(),e, "获取验证码异常:%s",e.getMessage());
    
     }
    
    }
    
    

    2:前端JS 代码

    $("#getYzm").click(function(){
    
     var url = "http://www.sojson.com/getYzm.shtml?t=" + Math.random();
    
     this.src = url;
    
    }).click().show();
    
    

    3:工具类

    package com.pro.shiro.shiro;
    
    import java.awt.Color;
    import java.awt.Font;
    import java.awt.Graphics;
    import java.awt.Graphics2D;
    import java.awt.RenderingHints;
    import java.awt.geom.AffineTransform;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.Arrays;
    import java.util.Random;
    import javax.imageio.ImageIO;
    
    public class VerifyCodeUtils {
    
         //使用到Algerian字体,系统里没有的话需要安装字体,字体只显示大写,去掉了1,0,i,o几个容易混淆的字符  
        public static final String VERIFY_CODES = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";  
        private static Random random = new Random();  
      
        
        /**
         * 验证码对象
         * @author 
         *
         */
        public static class Verify{
            
            private String code;//如 1 + 2
            
            private Integer value;//如  3
            public String getCode() {
                return code;
            }
            public void setCode(String code) {
                this.code = code;
            }
            public Integer getValue() {
                return value;
            }
            public void setValue(Integer value) {
                this.value = value;
            }
        }
      
        /** 
         * 使用系统默认字符源生成验证码 
         * @param verifySize    验证码长度 
         * @return 
         */  
        public static Verify generateVerify(){  
            int number1 = new Random().nextInt(10) + 1;;
            int number2 = new Random().nextInt(10) + 1;;
            Verify entity = new Verify();
            entity.setCode(number1  + " x " + number2);
            entity.setValue(number1 + number2);
            return entity;
        }  
        
        /** 
         * 使用系统默认字符源生成验证码 
         * @param verifySize    验证码长度 
         * @return 
         */  
        public static String generateVerifyCode(int verifySize){  
            return generateVerifyCode(verifySize, VERIFY_CODES);  
        }  
        
        
        /** 
         * 使用指定源生成验证码 
         * @param verifySize    验证码长度 
         * @param sources   验证码字符源 
         * @return 
         */  
        public static String generateVerifyCode(int verifySize, String sources){  
            if(sources == null || sources.length() == 0){  
                sources = VERIFY_CODES;  
            }  
            int codesLen = sources.length();  
            Random rand = new Random(System.currentTimeMillis());  
            StringBuilder verifyCode = new StringBuilder(verifySize);  
            for(int i = 0; i < verifySize; i++){  
                verifyCode.append(sources.charAt(rand.nextInt(codesLen-1)));  
            }  
            return verifyCode.toString();  
        }  
          
        /** 
         * 生成随机验证码文件,并返回验证码值 
         * @param w 
         * @param h 
         * @param outputFile 
         * @param verifySize 
         * @return 
         * @throws IOException 
         */  
        public static String outputVerifyImage(int w, int h, File outputFile, int verifySize) throws IOException{  
            String verifyCode = generateVerifyCode(verifySize);  
            outputImage(w, h, outputFile, verifyCode);  
            return verifyCode;  
        }  
          
        /** 
         * 输出随机验证码图片流,并返回验证码值 
         * @param w 
         * @param h 
         * @param os 
         * @param verifySize 
         * @return 
         * @throws IOException 
         */  
        public static String outputVerifyImage(int w, int h, OutputStream os, int verifySize) throws IOException{  
            String verifyCode = generateVerifyCode(verifySize);  
            outputImage(w, h, os, verifyCode);  
            return verifyCode;  
        }  
          
        /** 
         * 生成指定验证码图像文件 
         * @param w 
         * @param h 
         * @param outputFile 
         * @param code 
         * @throws IOException 
         */  
        public static void outputImage(int w, int h, File outputFile, String code) throws IOException{  
            if(outputFile == null){  
                return;  
            }  
            File dir = outputFile.getParentFile();  
            if(!dir.exists()){  
                dir.mkdirs();  
            }  
            try{  
                outputFile.createNewFile();  
                FileOutputStream fos = new FileOutputStream(outputFile);  
                outputImage(w, h, fos, code);  
                fos.close();  
            } catch(IOException e){  
                throw e;  
            }  
        }  
          
        /** 
         * 输出指定验证码图片流 
         * @param w 
         * @param h 
         * @param os 
         * @param code 
         * @throws IOException 
         */  
        public static void outputImage(int w, int h, OutputStream os, String code) throws IOException{  
            int verifySize = code.length();  
            BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);  
            Random rand = new Random();  
            Graphics2D g2 = image.createGraphics();  
            g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,RenderingHints.VALUE_ANTIALIAS_ON);  
            Color[] colors = new Color[5];  
            Color[] colorSpaces = new Color[] { Color.WHITE, Color.CYAN,  
                    Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE,  
                    Color.PINK, Color.YELLOW };  
            float[] fractions = new float[colors.length];  
            for(int i = 0; i < colors.length; i++){  
                colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];  
                fractions[i] = rand.nextFloat();  
            }  
            Arrays.sort(fractions);  
              
            g2.setColor(Color.GRAY);// 设置边框色  
            g2.fillRect(0, 0, w, h);  
              
            Color c = getRandColor(200, 250);  
            g2.setColor(c);// 设置背景色  
            g2.fillRect(0, 2, w, h-4);  
              
            //绘制干扰线  
            Random random = new Random();  
            g2.setColor(getRandColor(160, 200));// 设置线条的颜色  
            for (int i = 0; i < 20; i++) {  
                int x = random.nextInt(w - 1);  
                int y = random.nextInt(h - 1);  
                int xl = random.nextInt(6) + 1;  
                int yl = random.nextInt(12) + 1;  
                g2.drawLine(x, y, x + xl + 40, y + yl + 20);  
            }  
              
            // 添加噪点  
            float yawpRate = 0.05f;// 噪声率  
            int area = (int) (yawpRate * w * h);  
            for (int i = 0; i < area; i++) {  
                int x = random.nextInt(w);  
                int y = random.nextInt(h);  
                int rgb = getRandomIntColor();  
                image.setRGB(x, y, rgb);  
            }  
              
            shear(g2, w, h, c);// 使图片扭曲  
      
            g2.setColor(getRandColor(100, 160));  
            int fontSize = h-4;  
            Font font = new Font("Algerian", Font.ITALIC, fontSize);  
            g2.setFont(font);  
            char[] chars = code.toCharArray();  
            for(int i = 0; i < verifySize; i++){  
                AffineTransform affine = new AffineTransform();  
                affine.setToRotation(Math.PI / 4 * rand.nextDouble() * (rand.nextBoolean() ? 1 : -1), (w / verifySize) * i + fontSize/2, h/2);  
                g2.setTransform(affine);  
                g2.drawChars(chars, i, 1, ((w-10) / verifySize) * i + 5, h/2 + fontSize/2 - 10);  
            }  
              
            g2.dispose();  
            ImageIO.write(image, "jpg", os);  
        }  
          
        private static Color getRandColor(int fc, int bc) {  
            if (fc > 255)  
                fc = 255;  
            if (bc > 255)  
                bc = 255;  
            int r = fc + random.nextInt(bc - fc);  
            int g = fc + random.nextInt(bc - fc);  
            int b = fc + random.nextInt(bc - fc);  
            return new Color(r, g, b);  
        }  
          
        private static int getRandomIntColor() {  
            int[] rgb = getRandomRgb();  
            int color = 0;  
            for (int c : rgb) {  
                color = color << 8;  
                color = color | c;  
            }  
            return color;  
        }  
          
        private static int[] getRandomRgb() {  
            int[] rgb = new int[3];  
            for (int i = 0; i < 3; i++) {  
                rgb[i] = random.nextInt(255);  
            }  
            return rgb;  
        }  
      
        private static void shear(Graphics g, int w1, int h1, Color color) {  
            shearX(g, w1, h1, color);  
            shearY(g, w1, h1, color);  
        }  
          
        private static void shearX(Graphics g, int w1, int h1, Color color) {  
      
            int period = random.nextInt(2);  
      
            boolean borderGap = true;  
            int frames = 1;  
            int phase = random.nextInt(2);  
      
            for (int i = 0; i < h1; i++) {  
                double d = (double) (period >> 1)  
                        * Math.sin((double) i / (double) period  
                                + (6.2831853071795862D * (double) phase)  
                                / (double) frames);  
                g.copyArea(0, i, w1, 1, (int) d, 0);  
                if (borderGap) {  
                    g.setColor(color);  
                    g.drawLine((int) d, i, 0, i);  
                    g.drawLine((int) d + w1, i, w1, i);  
                }  
            }  
      
        }  
      
        private static void shearY(Graphics g, int w1, int h1, Color color) {  
      
            int period = random.nextInt(40) + 10; // 50;  
      
            boolean borderGap = true;  
            int frames = 20;  
            int phase = 7;  
            for (int i = 0; i < w1; i++) {  
                double d = (double) (period >> 1)  
                        * Math.sin((double) i / (double) period  
                                + (6.2831853071795862D * (double) phase)  
                                / (double) frames);  
                g.copyArea(i, 0, 1, h1, 0, (int) d);  
                if (borderGap) {  
                    g.setColor(color);  
                    g.drawLine(i, (int) d, i, 0);  
                    g.drawLine(i, (int) d + h1, i, h1);  
                }  
      
            }  
      
        }  
        public static void main(String[] args) throws IOException{  
            File dir = new File("F:/verifies");  
            int w = 200, h = 80;  
            for(int i = 0; i < 50; i++){  
                String verifyCode = generateVerifyCode(4);  
                File file = new File(dir, verifyCode + ".jpg");  
                outputImage(w, h, file, verifyCode);  
            }  
        
        
       
    }
        
        
    }
    
    
    
    

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