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生成隨機驗證碼
VerifyCode 工具類

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: 隨機驗證碼 
 * @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={"宋體","華文楷體","黑體","微軟雅黑","楷體_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&nbsp;sb&amp;amp;nbsp;= new StringBuilder(); 
        for(int i =0;i<4;i++){ 
            String s= randomChar()+""; 
           &nbsp;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);//添加干擾線 
        return image; 
    } 
    //返回驗證碼上的文本 
    public String getText(){ 
        return this.text; 
    } 
    //保存圖片到指定的輸出流 
    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("圖片中的驗證是："+vc.getText()); 
    } 
} 

使用

/** 
     * 生成隨機驗證碼     */    @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); 
    } 

驗證方法

/** 
     * 賬號登錄 
     * @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){ 
        //校驗驗證碼 
        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); 
    }