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EasyCaptcha\n\n![MavenCentral](https://img.shields.io/maven-central/v/com.github.whvcse/easy-captcha?style=flat-square)\n![Hex.pm](https://img.shields.io/hexpm/l/plug.svg?style=flat-square)\n\n\n## 1.简介\n\u0026emsp;Java图形验证码，支持gif、中文、算术等类型，可用于Java Web、JavaSE等项目。\n\n---\n\n## 2.效果展示\n\n![验证码](https://s2.ax1x.com/2019/08/23/msFrE8.png) \n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msF0DP.png)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msFwut.png)\n\u003cbr/\u003e\n![验证码](https://s2.ax1x.com/2019/08/23/msFzVK.gif) \n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msFvb6.gif)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msFXK1.gif)\n\n**算术类型：**\n\n![验证码](https://s2.ax1x.com/2019/08/23/mskKPg.png)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msknIS.png)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/mskma8.png)\n\n**中文类型：**\n\n![验证码](https://s2.ax1x.com/2019/08/23/mskcdK.png)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msk6Z6.png)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msksqx.png)\n\n**内置字体：**\n\n![验证码](https://s2.ax1x.com/2019/08/23/msAVSJ.png)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msAAW4.png)\n\u0026emsp;\u0026emsp;\n![验证码](https://s2.ax1x.com/2019/08/23/msAkYF.png)\n\n\n---\n\n## 3.导入项目\n\n### 3.1.gradle方式的引入\n```text\ndependencies {\n    compile 'com.github.whvcse:easy-captcha:1.6.2'\n}\n```\n\n### 3.2.maven方式引入\n```xml\n\u003cdependencies\u003e\n   \u003cdependency\u003e\n      \u003cgroupId\u003ecom.github.whvcse\u003c/groupId\u003e\n      \u003cartifactId\u003eeasy-captcha\u003c/artifactId\u003e\n      \u003cversion\u003e1.6.2\u003c/version\u003e\n   \u003c/dependency\u003e\n\u003c/dependencies\u003e\n```\n\n### 3.3.jar包下载\n[easy-captcha-1.6.2.jar](https://gitee.com/whvse/EasyCaptcha/releases)\n\nmaven导入jar包，在项目根目录创建`libs`文件夹，然后pom.xml添加如下：\n```\n\u003cdependency\u003e\n  \u003cgroupId\u003ecom.github.whvcse\u003c/groupId\u003e\n  \u003cartifactId\u003eeasy-captcha\u003c/artifactId\u003e\n  \u003cversion\u003e1.6.1\u003c/version\u003e\n  \u003csystemPath\u003e${basedir}/libs/easy-captcha-1.6.2.jar\u003c/systemPath\u003e\n\u003c/dependency\u003e\n```\n\n---\n\n## 4.使用方法\n\n### 4.1.在SpringMVC中使用\n```java\n@Controller\npublic class CaptchaController {\n    \n    @RequestMapping(\"/captcha\")\n    public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {\n        CaptchaUtil.out(request, response);\n    }\n}\n```\n前端html代码：\n```html\n\u003cimg src=\"/captcha\" width=\"130px\" height=\"48px\" /\u003e\n```\n\n\u003e 不要忘了把`/captcha`路径排除登录拦截，比如shiro的拦截。\n\n### 4.2.在servlet中使用\nweb.xml中配置servlet：\n```xml\n\u003cweb-app\u003e\n    \u003c!-- 图形验证码servlet --\u003e\n    \u003cservlet\u003e\n        \u003cservlet-name\u003eCaptchaServlet\u003c/servlet-name\u003e\n        \u003cservlet-class\u003ecom.wf.captcha.servlet.CaptchaServlet\u003c/servlet-class\u003e\n    \u003c/servlet\u003e\n    \u003cservlet-mapping\u003e\n        \u003cservlet-name\u003eCaptchaServlet\u003c/servlet-name\u003e\n        \u003curl-pattern\u003e/captcha\u003c/url-pattern\u003e\n    \u003c/servlet-mapping\u003e\n\u003c/web-app\u003e\n\n```\n前端html代码：\n```html\n\u003cimg src=\"/captcha\" width=\"130px\" height=\"48px\" /\u003e\n```\n\n### 4.3.判断验证码是否正确\n\n```java\n@Controller\npublic class LoginController {\n    \n    @PostMapping(\"/login\")\n    public JsonResult login(String username,String password,String verCode){\n        if (!CaptchaUtil.ver(verCode, request)) {\n            CaptchaUtil.clear(request);  // 清除session中的验证码\n            return JsonResult.error(\"验证码不正确\");\n        }\n    }   \n}\n```\n\n### 4.4.设置宽高和位数\n```java\n@Controller\npublic class CaptchaController {\n    \n    @RequestMapping(\"/captcha\")\n    public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {\n        // 设置位数\n        CaptchaUtil.out(5, request, response);\n        // 设置宽、高、位数\n        CaptchaUtil.out(130, 48, 5, request, response);\n        \n        // 使用gif验证码\n        GifCaptcha gifCaptcha = new GifCaptcha(130,48,4);\n        CaptchaUtil.out(gifCaptcha, request, response);\n    }\n}\n```\n\n### 4.5.不使用工具类\n\u0026emsp;CaptchaUtil封装了输出验证码、存session、判断验证码等功能，也可以不使用此工具类：\n\n```java\n@Controller\npublic class CaptchaController {\n    \n    @RequestMapping(\"/captcha\")\n    public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {\n        // 设置请求头为输出图片类型\n        response.setContentType(\"image/gif\");\n        response.setHeader(\"Pragma\", \"No-cache\");\n        response.setHeader(\"Cache-Control\", \"no-cache\");\n        response.setDateHeader(\"Expires\", 0);\n        \n        // 三个参数分别为宽、高、位数\n        SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);\n        // 设置字体\n        specCaptcha.setFont(new Font(\"Verdana\", Font.PLAIN, 32));  // 有默认字体，可以不用设置\n        // 设置类型，纯数字、纯字母、字母数字混合\n        specCaptcha.setCharType(Captcha.TYPE_ONLY_NUMBER);\n        \n        // 验证码存入session\n        request.getSession().setAttribute(\"captcha\", specCaptcha.text().toLowerCase());\n        \n        // 输出图片流\n        specCaptcha.out(response.getOutputStream());\n    }\n    \n    @PostMapping(\"/login\")\n    public JsonResult login(String username,String password,String verCode){\n        // 获取session中的验证码\n        String sessionCode = request.getSession().getAttribute(\"captcha\");\n        // 判断验证码\n        if (verCode==null || !sessionCode.equals(verCode.trim().toLowerCase())) {\n            return JsonResult.error(\"验证码不正确\");\n        }\n    }  \n}\n```\n\n## 5.更多设置\n\n### 5.1.验证码类型\n\n```java\npublic class Test {\n    \n    public static void main(String[] args) {\n        // png类型\n        SpecCaptcha captcha = new SpecCaptcha(130, 48);\n        captcha.text();  // 获取验证码的字符\n        captcha.textChar();  // 获取验证码的字符数组\n        \n        // gif类型\n        GifCaptcha captcha = new GifCaptcha(130, 48);\n        \n        // 中文类型\n        ChineseCaptcha captcha = new ChineseCaptcha(130, 48);\n        \n        // 中文gif类型\n        ChineseGifCaptcha captcha = new ChineseGifCaptcha(130, 48);\n        \n        // 算术类型\n        ArithmeticCaptcha captcha = new ArithmeticCaptcha(130, 48);\n        captcha.setLen(3);  // 几位数运算，默认是两位\n        captcha.getArithmeticString();  // 获取运算的公式：3+2=?\n        captcha.text();  // 获取运算的结果：5\n        \n        captcha.out(outputStream);  // 输出验证码\n    }\n}\n```\n\n\u003e 注意：\u003cbr/\u003e\n\u003e \u0026emsp;算术验证码的len表示是几位数运算，而其他验证码的len表示验证码的位数，算术验证码的text()表示的是公式的结果，\n\u003e 对于算术验证码，你应该把公式的结果存储session，而不是公式。\n\n### 5.2.验证码字符类型\n\n 类型 | 描述 \n :--- | :--- \n TYPE_DEFAULT | 数字和字母混合 \n TYPE_ONLY_NUMBER | 纯数字\n TYPE_ONLY_CHAR | 纯字母 \n TYPE_ONLY_UPPER | 纯大写字母\n TYPE_ONLY_LOWER | 纯小写字母\n TYPE_NUM_AND_UPPER | 数字和大写字母\n\n使用方法：\n```\nSpecCaptcha captcha = new SpecCaptcha(130, 48, 5);\ncaptcha.setCharType(Captcha.TYPE_ONLY_NUMBER);\n```\n\n\u003e 只有`SpecCaptcha`和`GifCaptcha`设置才有效果。\n\n### 5.3.字体设置\n内置字体：\n\n 字体 | 效果 \n :--- | :--- \n Captcha.FONT_1 |  ![](https://s2.ax1x.com/2019/08/23/msMe6U.png)\n Captcha.FONT_2 | ![](https://s2.ax1x.com/2019/08/23/msMAf0.png)\n Captcha.FONT_3 |  ![](https://s2.ax1x.com/2019/08/23/msMCwj.png)\n Captcha.FONT_4 | ![](https://s2.ax1x.com/2019/08/23/msM9mQ.png)\n Captcha.FONT_5 | ![](https://s2.ax1x.com/2019/08/23/msKz6S.png)\n Captcha.FONT_6 | ![](https://s2.ax1x.com/2019/08/23/msKxl8.png)\n Captcha.FONT_7 | ![](https://s2.ax1x.com/2019/08/23/msMPTs.png)\n Captcha.FONT_8 | ![](https://s2.ax1x.com/2019/08/23/msMmXF.png)\n Captcha.FONT_9 | ![](https://s2.ax1x.com/2019/08/23/msMVpV.png)\n Captcha.FONT_10 | ![](https://s2.ax1x.com/2019/08/23/msMZlT.png)\n\n使用方法：\n```\nSpecCaptcha captcha = new SpecCaptcha(130, 48, 5);\n\n// 设置内置字体\ncaptcha.setFont(Captcha.FONT_1); \n\n// 设置系统字体\ncaptcha.setFont(new Font(\"楷体\", Font.PLAIN, 28)); \n```\n\n### 5.4.输出base64编码\n```\nSpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);\nspecCaptcha.toBase64();\n\n// 如果不想要base64的头部data:image/png;base64,\nspecCaptcha.toBase64(\"\");  // 加一个空的参数即可\n```\n\n### 5.5.输出到文件\n```\nFileOutputStream outputStream = new FileOutputStream(new File(\"C:/captcha.png\"))\nSpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);\nspecCaptcha.out(outputStream);\n```\n\n---\n\n## 6.前后端分离项目的使用\n\n\u0026emsp;前后端分离项目建议不要存储在session中，存储在redis中，redis存储需要一个key，key一同返回给前端用于验证输入：\n```java\n@Controller\npublic class CaptchaController {\n    @Autowired\n    private RedisUtil redisUtil;\n    \n    @ResponseBody\n    @RequestMapping(\"/captcha\")\n    public JsonResult captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {\n        SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);\n        String verCode = specCaptcha.text().toLowerCase();\n        String key = UUID.randomUUID().toString();\n        // 存入redis并设置过期时间为30分钟\n        redisUtil.setEx(key, verCode, 30, TimeUnit.MINUTES);\n        // 将key和base64返回给前端\n        return JsonResult.ok().put(\"key\", key).put(\"image\", specCaptcha.toBase64());\n    }\n    \n    @ResponseBody\n    @PostMapping(\"/login\")\n    public JsonResult login(String username,String password,String verCode,String verKey){\n        // 获取redis中的验证码\n        String redisCode = redisUtil.get(verKey);\n        // 判断验证码\n        if (verCode==null || !redisCode.equals(verCode.trim().toLowerCase())) {\n            return JsonResult.error(\"验证码不正确\");\n        }\n    }  \n}\n```\n前端使用ajax获取验证码：\n```html\n\u003cimg id=\"verImg\" width=\"130px\" height=\"48px\"/\u003e\n\n\u003cscript\u003e\n    var verKey;\n    // 获取验证码\n    $.get('/captcha', function(res) {\n        verKey = res.key;\n        $('#verImg').attr('src', res.image);\n    },'json');\n    \n    // 登录\n    $.post('/login', {\n        verKey: verKey,\n        verCode: '8u6h',\n        username: 'admin'，\n        password: 'admin'\n    }, function(res) {\n        console.log(res);\n    }, 'json');\n\u003c/script\u003e\n```\n\n\u003e RedisUtil到这里获取[https://gitee.com/whvse/RedisUtil](https://gitee.com/whvse/RedisUtil)\n\n---\n\n## 7.自定义效果\n\n\u0026emsp;继承`Captcha`实现`out`方法，中文验证码可继承`ChineseCaptchaAbstract`，算术验证码可继承`ArithmeticCaptchaAbstract`。\n\n---\n\n## 8.更新日志\n\n- **2019-08-23 (v1.6.2)**\n    - 增加10种漂亮的内置字体，不依赖系统字体\n    \n    - 增加算术验证码，运算位数可自由配置\n    - 增加输出base64编码的功能\n    - 增加贝塞尔曲线作为干扰线\n    \n- **2018-08-09 (v1.5.0)**\n    - 增加纯大写字母、纯小写字母、数字和大写字母配置\n    \n    - 增加中文验证码、中文gif验证码\n    - 增加抗锯齿效果，优化文字颜色\n    - 增加CaptchaUtil便于Web项目使用\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fele-admin%2FEasyCaptcha","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fele-admin%2FEasyCaptcha","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fele-admin%2FEasyCaptcha/lists"}