Day76-Spring Boot实践，开发社区登录模块-生成二维码

Day76-Spring Boot实践，开发社区登录模块-生成二维码

一.Kaptcha

1.1导入jar包

        <dependency>
            <groupId>com.github.pengglegroupId>
            <artifactId>kaptchaartifactId>
            <version>2.3.2version>
        dependency>
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1.2编写Kaptcha配置类

package com.nowcoder.community.config;

import com.google.code.kaptcha.Producer;
import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

@Configuration
public class KaptchaConfig{

    @Bean
    public Producer KaptchaProducer(){
        Properties properties = new Properties();
        properties.setProperty("Kaptcha.image.width","100");
        properties.setProperty("Kaptcha.image.height","40");
        properties.setProperty("Kaptcha.textproducer.font.size","32");
        properties.setProperty("Kaptcha.textproducer.font.color","0,0,0");
        properties.setProperty("Kaptcha.textproducer.char.string","0123456789ABCDEFGHIJKLMNOPQRSTUVWZYZ");
        properties.setProperty("Kaptcha.textproducer.char.length","4");
        properties.setProperty("Kaptcha.noise.impl","com.google.code.kaptcha.impl.NoNoise");

        DefaultKaptcha kaptcha = new DefaultKaptcha();
        Config config = new Config(properties);
        kaptcha.setConfig(config);
        return kaptcha;
    }



}

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1.3生成随机字符,生成图片

@RequestMapping(path = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response, HttpSession session){
        //生成验证码
        String text = kpatchaProducer.createText();
        BufferedImage image = kpatchaProducer.createImage(text);
        //将验证码存入session
        session.setAttribute("kaptcha",text);

        //将图片输出到浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image,"png",os);
        } catch (IOException e) {
            logger.error("响应验证码失败:"+e.getMessage());
        }

    }
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