Java生成随机图片验证码

分手后的思念是犯贱 2023-06-23 11:55 5阅读 0赞

转自：  [https://blog.csdn.net/qq\_32963841/article/details/103182827][https_blog.csdn.net_qq_32963841_article_details_103182827]

程序员把地府后台管理系统做出来了，还有3.0版本！12月7号最新消息：已在开发中有github地址:  [https://blog.csdn.net/m0\_37609579/article/details/103108301][https_blog.csdn.net_m0_37609579_article_details_103108301]

《吊打面试官》系列-Redis基础知识:  [https://blog.csdn.net/qq\_35190492/article/details/102841400][https_blog.csdn.net_qq_35190492_article_details_102841400]

java中的Maven项目的两种打包方法:  [https://blog.csdn.net/u010910436/article/details/48290323][https_blog.csdn.net_u010910436_article_details_48290323]

eclipse中打包maven项目完成流程: [https://blog.csdn.net/qq\_26442553/article/details/78693236][https_blog.csdn.net_qq_26442553_article_details_78693236]

[eclipse maven 打war包的几种方式][eclipse maven _war]:  [https://www.cnblogs.com/qlqwjy/p/8231032.html][eclipse maven _war]

eclipse通过maven install打包: [https://blog.csdn.net/yhblog/article/details/83818158][https_blog.csdn.net_yhblog_article_details_83818158]

[Eclipse中打包maven项目-war包方式][Eclipse_maven_-war]: [https://www.cnblogs.com/huangjinyong/p/9223934.html][Eclipse_maven_-war]

Eclipse中Maven打包程序并在Linux中运行: [https://cloud.tencent.com/developer/article/1080059][https_cloud.tencent.com_developer_article_1080059]

Eclipse中给maven项目打jar包:  [https://www.jianshu.com/p/a6bb81bb38d7][https_www.jianshu.com_p_a6bb81bb38d7]

效果如图

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" οnclick="change()">  
    </div>  
   
   
   
   
注释：此处的src="/qos/dog/getVerifyCodeImg"   SpringBoot页面展示Thymeleaf的语法  
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

[https_blog.csdn.net_qq_32963841_article_details_103182827]: https://blog.csdn.net/qq_32963841/article/details/103182827
[https_blog.csdn.net_m0_37609579_article_details_103108301]: https://blog.csdn.net/m0_37609579/article/details/103108301
[https_blog.csdn.net_qq_35190492_article_details_102841400]: https://blog.csdn.net/qq_35190492/article/details/102841400
[https_blog.csdn.net_u010910436_article_details_48290323]: https://blog.csdn.net/u010910436/article/details/48290323
[https_blog.csdn.net_qq_26442553_article_details_78693236]: https://blog.csdn.net/qq_26442553/article/details/78693236
[eclipse maven _war]: https://www.cnblogs.com/qlqwjy/p/8231032.html
[https_blog.csdn.net_yhblog_article_details_83818158]: https://blog.csdn.net/yhblog/article/details/83818158
[Eclipse_maven_-war]: https://www.cnblogs.com/huangjinyong/p/9223934.html
[https_cloud.tencent.com_developer_article_1080059]: https://cloud.tencent.com/developer/article/1080059
[https_www.jianshu.com_p_a6bb81bb38d7]: https://www.jianshu.com/p/a6bb81bb38d7