代码画验证码图片（一）

随机数验证码：

@Data
public class ImageCode {//图形中的内容private String code;//图片private ByteArrayInputStream image;private int width = 400;private int height = 100;public static ImageCode getInstance() throws IOException {return new ImageCode();}private ImageCode() throws IOException {//图像缓冲区 (黑板)BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);//画笔Graphics graphics = image.getGraphics();//拿笔涂色画图形graphics.setColor(new Color(255,255,255));//画矩形graphics.fillRect(0,0,width,height);//字体graphics.setFont(new Font("宋体",Font.PLAIN,30));Random random = new Random();this.code="";for(int i=0;i<6;i++){String s = String.valueOf(random.nextInt(10));this.code += s;graphics.setColor(new Color(45,31,37));graphics.drawString(s,(width/6)*i,40);//画线graphics.setColor(new Color(100,100,100));graphics.drawLine((width/6)*i,40,(width/6)*i+25,40-30);}graphics.setColor(new Color(100,100,100));for (int i=0;i<100;i++){int x = random.nextInt(width);int y = random.nextInt(height);int x1 = random.nextInt(20);int y1 = random.nextInt(20);graphics.drawLine(x,y,x+x1,y+y1);}//收笔graphics.dispose();ByteArrayInputStream inputStream = null;ByteOutputStream outputStream = new ByteOutputStream();try {//赋值给byteArrayInputStreamImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(outputStream);ImageIO.write(image,"jpeg",imageOutputStream);inputStream = new ByteArrayInputStream(outputStream.toByteArray());}catch (Exception e){System.out.println("生成验证码失败");}this.image = inputStream;}
}

加法验证码（1+8=？）：

@Data
public class ImageCode {//图形中的内容private String code;//图片private ByteArrayInputStream image;private int width = 400;private int height = 100;public static ImageCode getInstance() throws IOException {return new ImageCode();}private ImageCode() throws IOException {//图像缓冲区 (黑板)BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_BGR);//画笔Graphics graphics = image.getGraphics();//拿笔涂色画图形graphics.setColor(new Color(255,255,255));//画矩形graphics.fillRect(0,0,width,height);//字体graphics.setFont(new Font("宋体",Font.PLAIN,30));Random random = new Random();int num1 = random.nextInt(20);int num2 = random.nextInt(20);graphics.setColor(new Color(0,200,100));graphics.drawString(num1+"", (width/6)*0+2,60);graphics.drawString("+", (width/6)*1+2,60);graphics.drawString(num2+"", (width/6)*2+2,60);graphics.drawString("=", (width/6)*3+2,60);graphics.drawString("?", (width/6)*4+2,60);int result = num1 + num2;this.code = result + "";//画100段干扰线段graphics.setColor(new Color(100,100,100));for (int i=0;i<100;i++){int x = random.nextInt(width);int y = random.nextInt(height);int x1 = random.nextInt(20);int y1 = random.nextInt(20);graphics.drawLine(x,y,x+x1,y+y1);}//收笔graphics.dispose();ByteArrayInputStream inputStream = null;ByteOutputStream outputStream = new ByteOutputStream();try {//赋值给byteArrayInputStreamImageOutputStream imageOutputStream = ImageIO.createImageOutputStream(outputStream);ImageIO.write(image,"jpeg",imageOutputStream);inputStream = new ByteArrayInputStream(outputStream.toByteArray());}catch (Exception e){System.out.println("生成验证码失败");}this.image = inputStream;}
}

保存验证码图片：

@RestController
@RequestMapping("/code")
public class VerifyCodeController {String attrName = "verifyCode";@GetMapping("/generator")@TokenCheck(required = false)public void  generatorCode(HttpServletRequest request,HttpServletResponse response){try {ImageCode imageCode = ImageCode.getInstance();//验证码的值String code = imageCode.getCode();request.getSession().setAttribute(attrName,code);//验证码图片ByteArrayInputStream image = imageCode.getImage();response.setContentType("image/jpeg");byte[] bytes = new byte[1024];try(ServletOutputStream out = response.getOutputStream()){while (image.read(bytes)!=-1){out.write(bytes);}}}catch (Exception e){System.out.println("异常");}}@GetMapping("/verity")@TokenCheck(required = false)public String verity(String verityCode, HttpServletRequest request){String s = request.getSession().getAttribute(attrName).toString();if(verityCode.equals(s)){return "效验码验证通过";}return "效验码验证不通过";}
}

base64字符串验证码：

    String attrName = "verifyCode";@GetMapping("/generator-base64")@TokenCheck(required = false)public String  generatorCodeBase64(HttpServletRequest request,HttpServletResponse response){try {ImageCode imageCode = ImageCode.getInstance();//验证码的值String code = imageCode.getCode();request.getSession().setAttribute(attrName,code);//验证码图片ByteArrayInputStream image = imageCode.getImage();request.getSession().setAttribute(attrName,code);ByteArrayOutputStream swapStream = new ByteArrayOutputStream();byte[] buff = new byte[1024];int r = 0;while ((r=image.read(buff,0,1024))>0){swapStream.write(buff,0,r);}byte[] data = swapStream.toByteArray();return Base64.getEncoder().encodeToString(data);}catch (Exception e){System.out.println("异常");return "";}}@GetMapping("/verity")@TokenCheck(required = false)public String verity(String verityCode, HttpServletRequest request){String s = request.getSession().getAttribute(attrName).toString();if(verityCode.equals(s)){return "效验码验证通过";}return "效验码验证不通过";}
}

识别验证码：

<dependency><groupId>net.sourceforge.tess4j</groupId><artifactId>tess4j</artifactId><version>4.5.4</version>
</dependency>

public class TesseractTest {public static void main(String[] args) throws TesseractException {ITesseract iTesseract = new Tesseract();//语言包，加进来iTesseract.setDatapath("语言包具体路径");//iTesseract.setLanguage("chi_sim");iTesseract.setLanguage("eng");File fileDir = new File("文件具体路径");for(File file:fileDir.listFiles()){String s = iTesseract.doOCR(file);System.out.println(file.getName()+"识别后的数字:"+s);}}
}

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