package com.sandu.ximon.admin.security.authcode;
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import com.baomidou.mybatisplus.core.toolkit.StringUtils;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics2D;
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import java.awt.image.BufferedImage;
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import java.io.*;
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import java.util.Base64;
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import java.util.Random;
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import javax.imageio.ImageIO;
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public class ImageVerificationCode {
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private int weight = 400; //验证码图片的长和宽
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private int height = 160;
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private String text; //用来保存验证码的文本内容
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private Random r = new Random(); //获取随机数对象
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//private String[] fontNames = {"宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312"}; //字体数组
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//字体数组
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private String[] fontNames = {"Georgia"};
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//验证码数组
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private String codes = "123456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";
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/**
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* 获取随机的颜色
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*
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* @return
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*/
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private Color randomColor() {
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int r = this.r.nextInt(225); //这里为什么是225，因为当r，g，b都为255时，即为白色，为了好辨认，需要颜色深一点。
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int g = this.r.nextInt(225);
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int b = this.r.nextInt(225);
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return new Color(r, g, b); //返回一个随机颜色
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}
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/**
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* 获取随机字体
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*
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* @return
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*/
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private Font randomFont() {
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int index = r.nextInt(fontNames.length); //获取随机的字体
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String fontName = fontNames[index];
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int style = r.nextInt(4); //随机获取字体的样式，0是无样式，1是加粗，2是斜体，3是加粗加斜体
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int size = r.nextInt(30) + 80; //随机获取字体的大小
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return new Font(fontName, style, size); //返回一个随机的字体
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}
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/**
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* 获取随机字符
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*
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* @return
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*/
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private char randomChar() {
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int index = r.nextInt(codes.length());
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return codes.charAt(index);
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}
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/**
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* 画干扰线，验证码干扰线用来防止计算机解析图片
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*
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* @param image
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*/
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private void drawLine(BufferedImage image) {
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int num = r.nextInt(15); //定义干扰线的数量
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Graphics2D g = (Graphics2D) image.getGraphics();
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for (int i = 0; i < num; i++) {
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int x1 = r.nextInt(weight);
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int y1 = r.nextInt(height);
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int x2 = r.nextInt(weight);
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int y2 = r.nextInt(height);
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g.setColor(randomColor());
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g.drawLine(x1, y1, x2, y2);
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}
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}
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/**
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* 创建图片的方法
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*
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* @return
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*/
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private BufferedImage createImage() {
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//创建图片缓冲区
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BufferedImage image = new BufferedImage(weight, height, BufferedImage.TYPE_INT_RGB);
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//获取画笔
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Graphics2D g = (Graphics2D) image.getGraphics();
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//设置背景色随机
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g.setColor(new Color(255, 255, r.nextInt(245) + 10));
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g.fillRect(0, 0, weight, height);
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//返回一个图片
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return image;
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}
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/**
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* 获取验证码图片的方法
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*
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* @return
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*/
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public BufferedImage getImage() {
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BufferedImage image = createImage();
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Graphics2D g = (Graphics2D) image.getGraphics(); //获取画笔
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < 4; i++) //画四个字符即可
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{
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String s = randomChar() + ""; //随机生成字符，因为只有画字符串的方法，没有画字符的方法，所以需要将字符变成字符串再画
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sb.append(s); //添加到StringBuilder里面
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float x = i * 1.0F * weight / 4; //定义字符的x坐标
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g.setFont(randomFont()); //设置字体，随机
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g.setColor(randomColor()); //设置颜色，随机
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g.drawString(s, x, height - 10);
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}
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this.text = sb.toString();
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drawLine(image);
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return image;
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}
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/**
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* 获取验证码文本的方法
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*
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* @return
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*/
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public String getText() {
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return text;
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}
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public static void output(BufferedImage image, OutputStream out) throws IOException //将验证码图片写出的方法
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{
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ImageIO.write(image, "JPEG", out);
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}
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}
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