谷歌验证码kaptcha使用(包括前端获取解析)

1.后端

基于springboot开发。

包结构 

1.导入依赖

<!--kaptcha验证码生成器-->
		<dependency>
			<groupId>com.github.axet</groupId>
			<artifactId>kaptcha</artifactId>
			<version>0.0.9</version>
		</dependency>

2.配置类

@Configuration
public class CaptchaConfig {
    @Bean
    public DefaultKaptcha defaultKaptcha(){
        // 验证码生成器
        DefaultKaptcha captcha = new DefaultKaptcha();
        // 配置
        Properties properties = new Properties();
        //是否有边框
        properties.setProperty("kaptcha.border", "yes");
        //设置边框颜色
        properties.setProperty("kaptcha.border.color", "105,179,90");
        //边框粗细度,默认为1
        // properties.setProperty("kaptcha.border.thickness","1");
        //验证码
        properties.setProperty("kaptcha.session.key","code");
        //验证码文本字符颜色 默认为黑色
        properties.setProperty("kaptcha.textproducer.font.color", "blue");
        //设置字体样式
        properties.setProperty("kaptcha.textproducer.font.names", "宋体,楷体,微软雅黑");
        //字体大小,默认40
        properties.setProperty("kaptcha.textproducer.font.size", "30");
        //验证码文本字符内容范围 默认为abced2345678gfynmnpwx
        // properties.setProperty("kaptcha.textproducer.char.string", "");
        //字符长度,默认为5
        properties.setProperty("kaptcha.textproducer.char.length", "4");
        //字符间距 默认为2
        properties.setProperty("kaptcha.textproducer.char.space", "4");
        //验证码图片宽度 默认为200
        properties.setProperty("kaptcha.image.width", "100");
        //验证码图片高度 默认为40
        properties.setProperty("kaptcha.image.height", "40");
        Config config = new Config(properties);
        captcha.setConfig(config);
        return captcha;

    }
}

3.controller

@RestController
public class CaptchaController {

    @Autowired
    private DefaultKaptcha defaultKaptcha;
    
    @GetMapping(value = "/captcha",produces = "image/jpeg")
    public void getCaptcha(HttpServletRequest request, HttpServletResponse response){
        // 定义response输出类型为image/jpeg类型
        response.setDateHeader("Expires", 0);
        // Set standard HTTP/1.1 no-cache headers.
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        // Set IE extended HTTP/1.1 no-cache headers (use addHeader).
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        // Set standard HTTP/1.0 no-cache header.
        response.setHeader("Pragma", "no-cache");
        // return a jpeg
        response.setContentType("image/jpeg");

        //-------------------生成验证码 begin --------------------------
        //获取验证码文本内容
        String text = defaultKaptcha.createText();
        //将验证码文本内容放入session
        request.getSession().setAttribute("captcha",text);
        // 创建验证码图像
        BufferedImage image = defaultKaptcha.createImage(text);
        ServletOutputStream outputStream = null;
        try {
            outputStream = response.getOutputStream();
            //输出流输出图片,格式为jpg
            ImageIO.write(image,"jpg",outputStream);
            outputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            if (null!=outputStream){
                try {
                    outputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

}

2.前端

基于 vue 和 axios,这里只展示请求部分,如何拿到后端验证码图片的src路径

axios请求api

// 获取验证码
export function getCaptcha(){
    return request({
        method:"get",
        url: "/captcha",
        responseType:"blob" // 指定响应类型为二进制数据
    })
}

 根据请求api发起请求拿数据

   import {getCaptcha} from "@/api/login.js"

 // 获取验证码
    getCaptcha(){
      getCaptcha().then((resp)=>{
        const imgData = resp.data; // 拿到图片的二进制数据
        const imgSrc = URL.createObjectURL(new Blob([imgData],{type:'image/png'})) // 将二进制转换成url路径
        this.captcha = imgSrc;   
      })
    },

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转载自blog.csdn.net/Qhx20040819/article/details/131604411