331 lines
8.7 KiB
Markdown
331 lines
8.7 KiB
Markdown
# EasyCaptcha
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![JitPack](https://img.shields.io/jitpack/v/whvcse/EasyCaptcha.svg?style=flat-square)
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![Hex.pm](https://img.shields.io/hexpm/l/plug.svg?style=flat-square)
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## 1.简介
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  Java图形验证码,支持gif验证码、中文验证码,可用于Java Web、JavaSE项目。
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## 2.效果展示
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**gif效果:**
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftpd30vgc2g303m01c0st.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftpd22ixh9g303m01c3yj.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftpd2k0gjug303m01ct8t.jpg)
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**png效果:**
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftpd09lqpaj303m01cwee.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftpd0tj6nhj303m01ct8m.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftpd1cw3pcj303m01c0sn.jpg)
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**中文验证码:**
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftovnvbgx6g303m01cjrc.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftovojp2gng303m01cq2w.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftovp5u4c4g303m01cdft.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftovmfxg71j303m01cq2s.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftovmy720dj303m01cq2s.jpg)
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![验证码](https://ws1.sinaimg.cn/large/006a7GCKly1ftovn68um6j303m01cglf.jpg)
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## 3.导入项目
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### 2.1.gradle方式的引入
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需要先在project的build.gradle中添加:
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```text
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allprojects {
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repositories {
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maven { url 'https://jitpack.io' }
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}
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}
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```
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在项目的build.gradle中添加
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```text
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dependencies {
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compile 'com.github.whvcse:EasyCaptcha:1.5.0'
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}
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```
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### 2.2.maven方式引入
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在你的pom.xml中添加如下代码:
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```xml
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<project>
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<repositories>
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<repository>
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<id>jitpack.io</id>
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<url>https://jitpack.io</url>
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</repository>
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</repositories>
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<dependencies>
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<dependency>
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<groupId>com.github.whvcse</groupId>
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<artifactId>EasyCaptcha</artifactId>
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<version>1.5.0</version>
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</dependency>
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</dependencies>
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</project>
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```
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### 2.3.jar包下载
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[EasyCaptcha-1.5.0.jar](https://gitee.com/whvse/EasyCaptcha/releases)
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---
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## 3.使用方法
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### 3.1.快速使用
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1.在web.xml里面加入如下配置:
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```xml
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<web-app>
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<!-- 图形验证码servlet -->
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<servlet>
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<servlet-name>CaptchaServlet</servlet-name>
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<servlet-class>com.wf.captcha.servlet.CaptchaServlet</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>CaptchaServlet</servlet-name>
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<url-pattern>/images/captcha</url-pattern>
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</servlet-mapping>
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</web-app>
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```
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2.前端代码
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```html
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<img src="/images/captcha" />
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```
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### 3.2.在SpringMVC中使用
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也可以使用controller的形式输出验证码,方法如下:
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```java
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@Controller
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public class MainController {
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@RequestMapping("/images/captcha")
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public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
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CaptchaUtil.out(request, response);
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}
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}
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```
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前端代码:
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```html
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<img src="/images/captcha" />
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```
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### 3.3.判断验证码是否正确
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```java
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@Controller
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public class LoginController {
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@PostMapping("/login")
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public JsonResult login(String username,String password,String code){
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if (!CaptchaUtil.ver(code, request)) {
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CaptchaUtil.clear(request);
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return JsonResult.error("验证码不正确");
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}
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}
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}
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```
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### 3.4.设置宽高和位数
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```java
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@Controller
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public class MainController {
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@RequestMapping("/images/captcha")
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public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
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// 设置位数
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CaptchaUtil.out(5, request, response);
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// 设置宽、高、位数
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CaptchaUtil.out(130, 48, 5, request, response);
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}
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}
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```
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### 3.5.不使用工具类
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  CaptchaUtil是为了简化操作,封装了生成验证码、存session、判断验证码等功能。CaptchaUtil使用的GifCaptcha
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生成的字母数字混合的gif验证码,如果需要设置更多的参数,请参照如下操作使用:
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```java
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@Controller
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public class MainController {
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@RequestMapping("/images/captcha")
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public void captcha(HttpServletRequest request, HttpServletResponse response) throws Exception {
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// 设置请求头为输出图片类型
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CaptchaUtil.setHeader(response);
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// 三个参数分别为宽、高、位数
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GifCaptcha gifCaptcha = new GifCaptcha(130, 48, 5);
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// 设置字体
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gifCaptcha.setFont(new Font("Verdana", Font.PLAIN, 32)); // 有默认字体,可以不用设置
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// 设置类型,纯数字、纯字母、字母数字混合
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gifCaptcha.setCharType(Captcha.TYPE_ONLY_NUMBER);
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// 验证码存入session
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request.getSession().setAttribute("captcha", gifCaptcha.text().toLowerCase());
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// 输出图片流
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gifCaptcha.out(response.getOutputStream());
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}
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@PostMapping("/login")
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public JsonResult login(String username,String password,String code){
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// 获取session中的验证码
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String sessionCode = request.getSession().getAttribute("captcha");
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// 判断验证码
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if (code==null || !sessionCode.equals(code.trim().toLowerCase())) {
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return JsonResult.error("验证码不正确");
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}
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}
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}
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```
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## 4.更多设置
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### 4.1.使用Gif验证码
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```java
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public class Test {
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public static void main(String[] args) {
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OutputStream outputStream = new FileOutputStream(new File("D:/a/aa.gif"));
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// 三个参数分别为宽、高、位数
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GifCaptcha gifCaptcha = new GifCaptcha(130, 48, 5);
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// 设置字体
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gifCaptcha.setFont(new Font("Verdana", Font.PLAIN, 32)); // 有默认字体,可以不用设置
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// 设置类型,纯数字、纯字母、字母数字混合
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gifCaptcha.setCharType(Captcha.TYPE_ONLY_NUMBER);
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// 生成的验证码
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String code = gifCaptcha.text();
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// 输出图片流
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gifCaptcha.out(outputStream);
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}
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}
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```
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### 4.2.使用png验证码
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```java
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public class Test {
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public static void main(String[] args) {
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OutputStream outputStream = new FileOutputStream(new File("D:/a/aa.png"));
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// 三个参数分别为宽、高、位数
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SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 5);
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// 设置字体
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specCaptcha.setFont(new Font("Verdana", Font.PLAIN, 32)); // 有默认字体,可以不用设置
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// 设置类型,纯数字、纯字母、字母数字混合
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specCaptcha.setCharType(Captcha.TYPE_ONLY_NUMBER);
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// 生成的验证码
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String code = specCaptcha.text();
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// 输出图片流
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specCaptcha.out(outputStream);
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}
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}
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```
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### 4.3.验证码类型
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类型 | 描述
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:--- | :---
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TYPE_DEFAULT | 数字和字母混合
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TYPE_ONLY_NUMBER | 纯数字
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TYPE_ONLY_CHAR | 纯字母
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TYPE_ONLY_UPPER | 纯大写字母
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TYPE_ONLY_LOWER | 纯小写字母
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TYPE_NUM_AND_UPPER | 数字和大写字母
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### 4.4.中文验证码
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中文png验证码:
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```java
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public class Test {
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public static void main(String[] args) {
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OutputStream outputStream = new FileOutputStream(new File("D:/a/aa.png"));
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// 三个参数分别为宽、高、位数
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ChineseCaptcha chineseCaptcha = new ChineseCaptcha(130, 48, 4);
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// 设置字体
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chineseCaptcha.setFont(new Font("楷体", Font.PLAIN, 28)); // 有默认字体,可以不用设置
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// 生成的验证码
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String code = chineseCaptcha.text();
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// 输出图片流
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chineseCaptcha.out(outputStream);
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}
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}
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```
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中文gif验证码:
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```java
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public class Test {
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public static void main(String[] args) {
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OutputStream outputStream = new FileOutputStream(new File("D:/a/aa.png"));
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// 三个参数分别为宽、高、位数
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ChineseGifCaptcha chineseGifCaptcha = new ChineseGifCaptcha(130, 48, 4);
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// 设置字体
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chineseGifCaptcha.setFont(new Font("楷体", Font.PLAIN, 28)); // 有默认字体,可以不用设置
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// 生成的验证码
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String code = chineseGifCaptcha.text();
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// 输出图片流
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chineseGifCaptcha.out(outputStream);
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}
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}
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```
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### 4.5.前后端分离项目的使用
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  分离项目建议不要存储在session中,存储在redis中。
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## 5.自定义效果
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参考源代码中的SpecCaptcha和GifCaptcha继承Captcha即可。
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