Java中文验证码实现

偏执的太偏执、 2022-11-12 10:52 159阅读 0赞

中文验证码实现，有几点需要注意：

*  一是生成的时候图片大小需要大一些，否则字体显示会非常不清晰，比如我设置的宽高就是700\*200
 *  二是Linux上使用时需要安装对应的字体，否则中文文字显示不出来。

目前实现了背景颜色随机、文字颜色及干扰线等颜色随机等；生成效果图如下所示：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ljYXJ1c2xpdQ_size_16_color_FFFFFF_t_70]  
随机生成第二次效果如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ljYXJ1c2xpdQ_size_16_color_FFFFFF_t_70 1]

package com.huashi.water.core.module.base.service;
    
    import com.huashi.water.core.common.service.RedisService;
    import com.liuqi.common.web.common.error.BusinessException;
    import org.springframework.stereotype.Service;
    
    import javax.annotation.Resource;
    import javax.imageio.ImageIO;
    import javax.servlet.http.HttpServletResponse;
    import java.awt.*;
    import java.awt.image.BufferedImage;
    import java.io.IOException;
    import java.util.*;
    import java.util.List;
    
    /** * 中文图片验证码 * * @author LiuQi 2021/3/2-11:10 * @version V1.0 **/
    @Service
    public class ChineseVerifyCodeService { 
        private static final int WIDTH = 700;
        private static final int HEIGHT = 200;
    
    // 常用中文字符
        private static final String WORDS = "\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6";
        private final List<Color> BG_COLORS = Arrays.asList(Color.decode("0xB4D9C2"), Color.decode("0xFAEBC8"), Color.decode("0xF5D5D3"), Color.decode("0xEDD3ED"),
                Color.decode("0xD4E5FF"), Color.decode("0xCCFCFF"), Color.decode("0xF2F2F2"));
        private final List<Color> TEXT_COLORS = Arrays.asList(Color.decode("0x7B297A"), Color.decode("0x992B23"), Color.decode("0x583E03"), Color.decode("0x205808"),
                Color.decode("0x04585D"), Color.decode("0x165BBF"), Color.decode("0x1610B2"), Color.decode("0x100066"), Color.decode("0x262626"), Color.decode("0x646B05"),
                Color.decode("0X410252"), Color.decode("0x84140C"), Color.decode("0x5C7427"), Color.decode("0x8C6604"), Color.decode("0xA003AB"), Color.decode("0x064D62"), Color.decode("0x06C70D"));
    
        @Resource
        private RedisService redisService;
    
        @Resource
        private HttpServletResponse response;
    
        public void generate(String key) { 
            BufferedImage bi = new BufferedImage(WIDTH, HEIGHT,
                    BufferedImage.TYPE_INT_RGB);
            Graphics2D g = (Graphics2D) bi.getGraphics();
    
            // 抗锯齿
            g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING, RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
            g.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_DEFAULT);
    
            // 设置背影色
            setBackGround(g);
            // 画干扰线
            drawRandomLine(g);
            // 写随机文本
            String random = drawRandomStr(g);
            redisService.cache("imageVerifyCode:" + key, random, 10);
            try { 
                ImageIO.write(bi, "jpg", response.getOutputStream());
            } catch (IOException e) { 
                throw BusinessException.create("生成验证码图片失败");
            }
        }
    
        /** * 校验验证码是否准确 */
        public boolean validate(String key, String text) { 
            String code = redisService.get("imageVerifyCode:" + key, String.class).orElse("");
            redisService.deleteCacheDirect("imageVerifyCode:" + key);
            return text.equals(code);
        }
    
        /** * 设置背景色 */
        private void setBackGround(Graphics g) { 
            // 设置颜色
            // 随机获取颜色
            Color color = BG_COLORS.get(new Random().nextInt(BG_COLORS.size()));
            g.setColor(color);
            // 填充区域
            g.fillRect(0, 0, WIDTH, HEIGHT);
        }
    
        /** * 画随机线条 */
        private void drawRandomLine(Graphics g) { 
            // 干扰点
            for (int i = 0; i < 40; i++) { 
                int x1 = new Random().nextInt(WIDTH);
                int y1 = new Random().nextInt(HEIGHT);
    
                g.setColor(TEXT_COLORS.get(new Random().nextInt(TEXT_COLORS.size())));
                g.setFont(new Font("Consolas", Font.BOLD, 20));
                g.drawString(".", x1, y1);
            }
    
            // 画干扰线
            for (int i = 0; i < 3; i++) { 
                int x1 = new Random().nextInt(WIDTH);
                int y1 = new Random().nextInt(HEIGHT);
    
                int x2 = new Random().nextInt(WIDTH);
                int y2 = new Random().nextInt(HEIGHT);
                g.setColor(TEXT_COLORS.get(new Random().nextInt(TEXT_COLORS.size())));
                g.drawLine(x1, y1, x2, y2);
            }
        }
    
        /** * 画随机汉字 */
        private String drawRandomStr(Graphics2D g) { 
            StringBuilder sb = new StringBuilder();
            // 设置字体
            g.setFont(new Font("楷体", Font.BOLD, 140));
            // 准备常用汉字集
            String base = WORDS;
            int x = 5;
            int y = 140;
            // 控制字数
            for (int i = 0; i < 6; i++) { 
                // 设置字体旋转角度
                int degree = new Random().nextInt(30);
    
                int sign = 1;
                if (new Random().nextInt(2) == 0) { 
                    sign = -1;
                }
    
                double rotate = sign * degree * Math.PI / 180;
                // 截取汉字
                String ch = base.charAt(new Random().nextInt(base.length())) + "";
                sb.append(ch);
                // 正向角度
                g.rotate(rotate, x, y);
    
                // 随机取颜色
                Color color = TEXT_COLORS.get(new Random().nextInt(TEXT_COLORS.size()));
                g.setColor(color);
    
                g.drawString(ch, x, y);
                // 反向角度
                g.rotate(-rotate, x, y);
                x += 110;
            }
            return sb.toString();
        }
    
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ljYXJ1c2xpdQ_size_16_color_FFFFFF_t_70]: /images/20221022/ac0b787e264e4dd49d35f93478b617f9.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2ljYXJ1c2xpdQ_size_16_color_FFFFFF_t_70 1]: /images/20221022/a1d66e618847489b8633598388d39f0f.png