图形验证码生成工具

来源：互联网发布：mysql 批量删除数据编辑：程序博客网时间：2024/05/17 03:21

一、引用所需的包

<dependencies>        <dependency>            <groupId>log4j</groupId>            <artifactId>log4j</artifactId>            <version>1.2.17</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>commons-codec</groupId>            <artifactId>commons-codec</artifactId>            <version>1.10</version>        </dependency>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.osgi</groupId>            <artifactId>org.osgi</artifactId>            <version>3.0.0</version>            <type>jar</type>        </dependency>        <dependency>            <groupId>org.slf4j</groupId>            <artifactId>slf4j-api</artifactId>            <version>1.7.7</version>            <type>jar</type>        </dependency> </dependencies>

二、工具类

public class CodeUtil {   public static final String VERIFY_CODES = "123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";    /**      * 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();          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);          Paint linearPaint = new LinearGradientPaint(0, 0, w, h, fractions, colors);          Paint linearPaint2 = new LinearGradientPaint(0, 0, w, h, new float[]{0.3f, .6f, .8f, .9f}, new Color[]{Color.BLUE, Color.BLACK, Color.GREEN, Color.BLUE});          //设置图片背景为白色          g2.setPaint(Color.WHITE);          g2.fillRect(0, 0, w, h);          //设置图片渐变背景          g2.setPaint(linearPaint);          g2.fillRoundRect(0, 0, w, h, 5, 5);                    g2.setPaint(linearPaint2);          int fontSize = (int) (Math.min(w/verifySize, h));          Font font = new Font("微软雅黑", Font.BOLD, 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 / verifySize) * i, h/2 + fontSize /2);          }          g2.dispose();          ImageIO.write(image, "jpg", os);      }      //    public static void main(String[] args) throws IOException{  //        File dir = new File("F:/verifies");  //        int w = 200, h = 80;  //        for(int i = 0; i < 100; i++){  //            String verifyCode = generateVerifyCode(4);  //            File file = new File(dir, verifyCode + ".jpg");  //            outputImage(w, h, file, verifyCode);  //        }  //    }  }

三、调用

<div class="form-group">                        <label for="verifyCode"><span class="form-require"></span>验证码：</label>                        <div class="form-control-box">                            <input class="form-control" type="text" id="verifyCode" value="" name="verifyCode">                            <img id="vCode" src="/Image.do" />                              <a href="javascript:changeCode();" class="login-forget primary"> 看不清,换一个</a>                         </div></div>

public void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {        int w = 70, h = 40;        String validateCode=CodeUtil.generateVerifyCode(4);        request.getSession().setAttribute("validateCode", validateCode);//必须放在方法调用的前面        CodeUtil.outputImage(w,h,response.getOutputStream(),validateCode);}

完毕！

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