package com.xcong.farmer.cms.modules.system.util;
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import com.google.code.kaptcha.impl.DefaultKaptcha;
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import com.xcong.farmer.cms.common.response.Result;
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import com.xcong.farmer.cms.modules.system.service.ICommonService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Component;
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import sun.misc.BASE64Encoder;
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import javax.imageio.ImageIO;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.util.*;
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import java.awt.*;
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@Component
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public class CaptchaUtil {
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@Autowired
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private DefaultKaptcha producer;
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@Autowired
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private ICommonService iCommonService;
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//生成catchCreator的map
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public Result catchaImgCreator() throws IOException {
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//生成文字验证码
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String text = producer.createText();
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//生成文字对应的图片验证码
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BufferedImage image = creatImage(text);
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//将图片写出
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ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
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ImageIO.write(image, "jpg", outputStream);
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//对写出的字节数组进行Base64编码 ==> 用于传递8比特字节码
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BASE64Encoder encoder = new BASE64Encoder();
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//生成token
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Map<String, Object> token = iCommonService.createToken(text);
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token.put("img", encoder.encode(outputStream.toByteArray()));
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return Result.ok(token);
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}
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private static final long serialVersionUID = 1L;
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//给定范围获得随机颜色
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public Color getRandColor(int fc, int bc) {
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Random random = new Random();
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if (fc > 255) {
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fc = 255;
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}
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if (bc > 255) {
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bc = 255;
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}
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int r = fc + random.nextInt(bc - fc);
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int g = fc + random.nextInt(bc - fc);
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int b = fc + random.nextInt(bc - fc);
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return new Color(r, g, b);
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}
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public BufferedImage creatImage(String code) {
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int width = 150, height = 42;
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//生成随机类
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Random random = new Random();
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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//获取图形上下文
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Graphics g = image.getGraphics();
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// 设定背景色
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g.setColor(getRandColor(200, 250));
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g.fillRect(0, 0, width, height);
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//设定字体 第二个参数为字体为加粗
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g.setFont(new Font("Times New Roman", Font.BOLD, 45));
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// 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
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g.setColor(getRandColor(160, 200));
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for (int i = 0; i < 155; i++) {
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int x = random.nextInt(width);
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int y = random.nextInt(height);
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int xl = random.nextInt(12);
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int yl = random.nextInt(12);
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g.drawLine(x, y, x + xl, y + yl);
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}
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// 取随机产生的认证码(4位数字)
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for (int i = 0; i < code.length(); i++) {
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String rand = code.substring(i, i + 1);
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// 将认证码显示到图象中
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g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
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//调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
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g.drawString(rand, 30 * i + 18, 35);
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}
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// 图象生效
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g.dispose();
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return image;
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}
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}
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