Java生成随机图片验证码

前台html代码

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<div style="margin-top: 50px;">         <span>验证码：</span><input type="text" name="verifyCode" id="verifyCode" style="width: 75px;height: 25px;"/>         <img id="verifyCodeImg" alt="点击更换" src="/qos/dog/getVerifyCodeImg"             title="点击更换">     </div>             注释：此处的src="/qos/dog/getVerifyCodeImg"   SpringBoot页面展示Thymeleaf的语法

前台js代码

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function change() {         var verifyCode = document.getElementById("verifyCodeImg");         verifyCode.src = "/qos/dog/getVerifyCodeImg?time=" + Math.random(1000);     }          /*-*/    /qos/dog/  这里的路径是需要换成自己的哦

验证代码，在controller里面新建一个util文件夹，然后放入VerifyCodeUtil.java

代码如下

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<font style="color:rgb(77, 77, 77)"><font face="&quot"><font style="font-size:16px">package com.paladin.qos.util;    import javax.imageio.ImageIO; import java.awt.*; import java.awt.image.BufferedImage; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.util.Random;    public class VerifyCodeUtil {        private static final Random random = new Random();     private static final String[] fontNames = {"宋体", "华文楷体", "黑体", "Georgia", "微软雅黑", "楷体_GB2312"};        public static String drawImage(ByteArrayOutputStream output) {         String code = "";         int width = 50;         int height = 25;            //创建图片缓冲区         BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);            Graphics2D g = bi.createGraphics();            //设置背景颜色         g.setBackground(new Color(255, 255, 255));         g.clearRect(0, 0, width, height);            StringBuilder stringBuilder = new StringBuilder();         //这里只画入四个字符         for (int i = 0; i < 4; i++) {             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             stringBuilder.append(s);           //添加到StringBuilder里面             float x = i * 1.0F * width / 4;   //定义字符的x坐标             g.setFont(randomFont());           //设置字体，随机             g.setColor(randomColor());         //设置颜色，随机             g.drawString(s, x, height - 5);         }         code = stringBuilder.toString();//获取验证码字符串            //定义干扰线         //定义干扰线的数量（3-5条）int num = random.nextInt(max)%(max-min+1) + min;         int num = random.nextInt(5) % 3 + 3;         Graphics2D graphics = (Graphics2D) bi.getGraphics();         for (int i = 0; i < num; i++) {             int x1 = random.nextInt(width);             int y1 = random.nextInt(height);             int x2 = random.nextInt(width);             int y2 = random.nextInt(height);             graphics.setColor(randomColor());             graphics.drawLine(x1, y1, x2, y2);         }         // 释放图形上下文         g.dispose();         try {             ImageIO.write(bi, "jpg", output);         } catch (IOException e) {             e.printStackTrace();         }         return code;//为了方便取值，直接返回code，              }        //随机字体     private static Font randomFont() {         int index = random.nextInt(fontNames.length);         String fontName = fontNames[index];         int style = random.nextInt(4);         //随机获取4种字体的样式         int size = random.nextInt(20) % 6 + 15;    //随机获取字体的大小(10-20之间的值)         return new Font(fontName, style, size);     }        //随机颜色     private static Color randomColor() {         int r = random.nextInt(225);         int g = random.nextInt(225);         int b = random.nextInt(225);         return new Color(r, g, b);     }           //随机字符     private static char randomChar() {         //A-Z,a-z,0-9,可剔除一些难辨认的字母与数字         String str = "0123456789ABCdefghiDEFGHIJopPQRVWXYZabcjklSTUmnqrstKLMNOvuwxyz";            return str.charAt(random.nextInt(str.length()));     }    }</font></font></font>

最后，在controller里面引用

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<font style="color:rgb(77, 77, 77)"><font face="&quot"><font style="font-size:16px">@RequestMapping("/getVerifyCodeImg")     @ResponseBody     public void getVerifyCodeImg(HttpServletResponse response, HttpSession session) {         ByteArrayOutputStream output = new ByteArrayOutputStream();         String code = VerifyCodeUtil.drawImage(output);         //将验证码文本直接存放到session中         session.setAttribute("verifyCode", code);         try {             ServletOutputStream out = response.getOutputStream();             output.writeTo(out);         } catch (IOException e) {             e.printStackTrace();         }     }</font></font></font>

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