分享一个Java生成二维码工具类

直接上代码：

1、CodeUtil.class

package top.lrshuai.blog.util;import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.util.Random;/*** 验证码工具类**/public class CodeUtil {private static final String[] CODE = { "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "P","Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z", "1", "2", "3", "4", "5", "6", "7", "8", "9" };/*** 生成验证码图片* * @return obj[0]: 图片; obj[1]:字符串*/public static Object[] CreateCode() {int imgW = 120;int imgH = 42;int r, g, b;Color color;String result = "";Random random = new Random();BufferedImage img = new BufferedImage(imgW, imgH, BufferedImage.TYPE_INT_RGB);Graphics2D graphics = img.createGraphics();graphics.setFont(new Font("MicroSoft YaHei", Font.PLAIN, 30));// 绘制背景色r = random.nextInt(20) + 230;g = random.nextInt(20) + 230;b = random.nextInt(20) + 230;color = new Color(r, g, b);graphics.setColor(color);graphics.fillRect(0, 0, imgW, imgH);// 绘制背景干扰线条for (int i = 0; i < 3; i++) {r = random.nextInt(50) + 200;g = random.nextInt(50) + 200;b = random.nextInt(50) + 200;color = new Color(r, g, b);graphics.setColor(color);graphics.setStroke(new BasicStroke(2.0f));graphics.drawLine(random.nextInt(20), random.nextInt(imgH), random.nextInt(20) + 80, random.nextInt(imgH));}if (random.nextInt(100) >= 50) {// 绘制字符串验证码for (int i = 0; i < 4; i++) {String str = CODE[random.nextInt(CODE.length)];r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);graphics.drawString(str, (i * 20) + 20, random.nextInt(4) + 30);result += str;}} else {// 绘制计算题验证码int is = random.nextInt(100);int num1 = 0, num2 = 0;if (is >= 50) {// 加法r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);num1 = random.nextInt(9) + 1;graphics.drawString(num1 + "", 20, random.nextInt(4) + 30);r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);graphics.drawString("+", 40, random.nextInt(4) + 30);r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);num2 = random.nextInt(9) + 1;graphics.drawString(num2 + "", 60, random.nextInt(4) + 30);r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);graphics.drawString("=", 80, random.nextInt(4) + 30);result = (num1 + num2) + "";} else {// 乘法r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);num1 = random.nextInt(9) + 1;graphics.drawString(num1 + "", 20, random.nextInt(4) + 30);r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);graphics.drawString("×", 40, random.nextInt(4) + 30);r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);num2 = random.nextInt(9) + 1;graphics.drawString(num2 + "", 60, random.nextInt(4) + 30);r = random.nextInt(180) + 50;g = random.nextInt(180) + 50;b = random.nextInt(180) + 50;color = new Color(r, g, b);graphics.setColor(color);graphics.drawString("=", 80, random.nextInt(4) + 30);result = (num1 * num2) + "";}}// 绘制前景干扰线条for (int i = 0; i < 3; i++) {r = random.nextInt(50) + 200;g = random.nextInt(50) + 200;b = random.nextInt(50) + 200;color = new Color(r, g, b);graphics.setColor(color);graphics.setStroke(new BasicStroke(1.0f));graphics.drawLine(0, random.nextInt(imgH), imgW, random.nextInt(imgH));}return new Object[] { img, result };}}

2、controller 请求

/*** 生成验证码* @throws IOException */@GetMapping(value = "/code")public String getCode(HttpServletResponse response){OutputStream os = null;try {// 获取图片Object[] img = CodeUtil.CreateCode();System.out.println("code="+img[1].toString());BufferedImage image = (BufferedImage) img[0];// 输出到浏览器response.setContentType("image/png");os = response.getOutputStream();ImageIO.write(image, "png", os);os.flush();// 用于验证的字符串存入sessionthis.getSession().setAttribute(Const.AUTH_CODE, img[1].toString());} catch (IOException e) {log.error("验证码输出异常",e);}finally {if(os != null) {try {os.close();} catch (IOException e) {System.out.println("close error");e.printStackTrace();}}}return null;}

3、html 页面调用

<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no" name="viewport"></head><body><img id="authCode" onclick="changeCode()" src="/code" alt="验证码" title="点击更换" /><script>function changeCode() {document.getElementById("authCode").src = "/code?t=" + genTimestamp();}function genTimestamp() {var time = new Date();return time.getTime();}</script></body></html>

分享结束，觉得不错，点个赞。

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