Java生成随机图片验证码

今天跟大佬学了JAVA随机生成验证码，

开心Ing,,,,,

激动ing,,,

前台html代码

 <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" onclick="change()">

 </div>

前台js代码

 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

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()));

 }

}

最后，在controller里面引用

 @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();

 }

 }

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原文链接：https://blog.csdn.net/qq_32963841/article/details/103182827