基于Java实现随机字母数字验证码

你的名字 2022-12-11 04:25 181阅读 0赞

#### 生成随街验证码 ####

**VerifyCode 工具类**

package com.meeno.common.cerifycode;
    
    import javax.imageio.ImageIO;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.io.FileNotFoundException;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.util.Random;
    
    /**
     * @description: 随机验证码
     * @author: Wzq
     * @create: 2020-09-08 16:55
     */
    public class VerifyCode {
    
        private int w=70;
        private int h=35;
        private Random r= new Random();
    
        private String[] fontNames={"宋体","华文楷体","黑体","微软雅黑","楷体_GB2312"};
        private String codes="012345678901234567890123456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ";
        private Color bgColor = new Color(255,255,255);
        private String text;
    
        private Color randomColor(){
            int red = r.nextInt(150);
            int green = r.nextInt(150);
            int blue = r.nextInt(150);
            return new Color(red,green,blue);
        }
    
        private Font randomFont(){
            int index = this.r.nextInt(fontNames.length);
            String fontName = fontNames[index];
            int style = this.r.nextInt(4);
            int size = this.r.nextInt(5) + 24;
            return new Font(fontName, style, size);
        }
    
        private void drawLine (BufferedImage image){
            int num = 3;
            Graphics2D g2=(Graphics2D)image.getGraphics();
            for(int i=0;i<num;i++){
                int x1=r.nextInt(w);
                int y1=r.nextInt(h);
                int x2=r.nextInt(w);
                int y2=r.nextInt(h);
                g2.setStroke(new BasicStroke(1.5F));
                g2.setColor(Color.BLUE);
                g2.drawLine(x1,y1,x2,y2);
            }
    
        }
    
        private char randomChar(){
            int index=r.nextInt(this.codes.length());
            return this.codes.charAt(index);
        }
    
        private BufferedImage createImage(){
            BufferedImage image=new BufferedImage(this.w,this.h,BufferedImage.TYPE_INT_RGB);//BufferedImage.TYPE_INT_RGB
            Graphics2D g2 = (Graphics2D)image.getGraphics();
            g2.setColor(this.bgColor);
            g2.fillRect(0,0,this.w,this.h);
            return image;
        }
    
        public BufferedImage getImage(){
            BufferedImage image=createImage();
            Graphics2D g2=(Graphics2D)image.getGraphics();
            StringBuilder sb = new StringBuilder();
            for(int i =0;i<4;i++){
                String s= randomChar()+"";
                sb.append(s);
                float x= i*1.0F*this.w/4.0F;
                g2.setFont(randomFont());
                g2.setColor(randomColor());
                g2.drawString(s,x,this.h-5);
            }
            this.text=sb.toString();
            drawLine(image);//添加干扰线
            return image;
        }
        //返回验证码上的文本
        public String getText(){
            return this.text;
    
        }
        //保存图片到指定的输出流
        public static void output(BufferedImage image, OutputStream out)
                throws IOException {
            ImageIO.write(image,"JPEG",out);
    
        }
    
        public static void main(String[] args) throws IOException {
            VerifyCode vc=new VerifyCode();
            BufferedImage bi = vc.getImage();
            VerifyCode.output(bi,new FileOutputStream("E:\\work\\temp\\xxx.jpg"));
    
            System.out.println("图片中的验证是："+vc.getText());
    
        }
    
    
    }

#### 使用 ####

/**
         * 生成随机验证码
         */
        @RequestMapping("randomVerifyCode.do")
        public ResponseBean randomVerifyCode() throws IOException {
            VerifyCode vc = new VerifyCode();
            BufferedImage bi = vc.getImage();
            //VerifyCode.output(bi,response.getOutputStream());
            ByteArrayOutputStream out = new ByteArrayOutputStream();
            ImageIO.write(bi, "png", out);
            byte[] bytes = out.toByteArray();
    
            String str = Base64.encode(bytes);
            str = "data:image/png;base64," + str;
    
            String uuid = IdUtil.simpleUUID();
    
            Map<String,String> resultMap = Maps.newHashMap();
            resultMap.put("base64", str);
            resultMap.put("uuid", uuid);
    
            //save redis
            String key = "RandomVerify:" + uuid;
            RedisUtil.set(key, vc.getText(), 180);
    
            return ResultUtil.success(resultMap);
        }

#### 验证方法 ####

/**
         * 账号登录
         * @param session
         * @param phone
         * @param pwd
         * @param entryType
         * @return
         */
        @RequestMapping("accountLogin.do")
        public ResponseBean accountLogin(final HttpSession session, String phone, String pwd, String entryType,
                                         String uuid, String randomCerifyCode){
    
            //校验验证码
            MeenoAssert.hasLength(randomCerifyCode,"randomCerifyCode can not empty!");
            Object randomCerifyCodeObj = RedisUtil.get("RandomVerify:" + uuid);
    
            MeenoAssert.notNull(randomCerifyCodeObj, CErrEnum.RANDOM_VERIFY_CODE_FAILURE);
            MeenoAssert.isTrue(randomCerifyCode.toLowerCase().equals(randomCerifyCodeObj.toString().toLowerCase()), CErrEnum.RANDOM_VERIFY_CODE_ERR);
    
    
            LoginResult loginResult = this.employeeService.accountLogin(session, phone, pwd, entryType);
            EmpView employeeView = this.employeeService.getEmployee(loginResult.getUserInfo().getId());
    
            Map<String,Object> resultMap = Maps.newHashMap();
            resultMap.put("loginResult", loginResult);
            resultMap.put("employee", employeeView);
    
            return ResultUtil.success(resultMap);
        }