登入驗證碼生成kaptcha（輸入驗證碼）

天梦红發表於2024-06-27
APT
新增依賴
<dependency>
    <groupId>com.github.axet</groupId>
    <artifactId>kaptcha</artifactId>
    <version>0.0.9</version>
</dependency>

配置類

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;

/**
 * 驗證碼配置
 */
@Configuration
public class KaptchaConfig {

    @Bean
    public DefaultKaptcha producer(){
        Properties properties = new Properties();
        properties.put("kaptcha.border", "no");
        properties.put("kaptcha.textproducer.font.color", "black");
        properties.put("kaptcha.textproducer.char.space", "5");
        Config config = new Config(properties);
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }
}

控制器，提供API

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletOutputStream;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.apache.tomcat.util.http.fileupload.IOUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;

/**
 * 驗證碼生成
 */
@RestController
public class SysLoginController {

    @Autowired
    private Producer producer;

    @GetMapping("captcha.jpg")
    public void captcha(HttpServletResponse response, HttpServletRequest request) throws ServletException, IOException {
        response.setHeader("Cache-Control", "no-store, no-cache");
        response.setContentType("image/jpeg");

        // 生成文字驗證碼
        String text = producer.createText();
        // 生成圖片驗證碼
        BufferedImage image = producer.createImage(text);
        // 儲存到驗證碼到 session
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY, text);

        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(image, "jpg", out);
        IOUtils.closeQuietly(out);
    }
}







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