图形验证码

java实现图片验证码

一、导入依赖

<dependency>
    <groupId>com.github.axet</groupId>
    <artifactId>kaptcha</artifactId>
    <version>0.0.9</version>
</dependency>

二、配置类创建DefaultKaptcha

package com.springboot.springbootvue.config;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.google.code.kaptcha.util.Config;
import java.util.Properties;
/**
 * @Author 张伟雄
 * @Date 2022/12/30
 **/
@Configuration
public class CaptchaConfig {

    @Bean
    public DefaultKaptcha defaultKaptcha(){
        //验证码生成器
        DefaultKaptcha defaultKaptcha=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);
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }

}

三、创建验证码接口

package com.springboot.springbootvue.controller;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import io.swagger.annotations.ApiOperation;
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 javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;


/**
 * @Author 张伟雄
 * @Date 2022/12/30
 **/
@RestController
public class CaptchaController {

    @Autowired
    private DefaultKaptcha defaultKaptcha;

    @ApiOperation(value = "验证码")
    @GetMapping(value = "/captcha",produces = "image/jpeg")
    public void captcha(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();
        System.out.println("验证码内容："+text);
        //将验证码文本内容放入session
        request.getSession().setAttribute("captcha",text);
        //根据文本验证码内容创建图形验证码
        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();
                }
            }
        }
        //-------------------生成验证码 end --------------------------
    }
}