简介

kaptcha是谷歌开源的简单实用的验证码生成工具。通过设置参数，可以自定义验证码大小、颜色、显示的字符等等。

Maven引入依赖

	<!-- https://mvnrepository.com/artifact/pro.fessional/kaptcha -->
    <dependency>
         <groupId>pro.fessional</groupId>
         <artifactId>kaptcha</artifactId>
         <version>2.3.3</version>
     </dependency>

新增配置类

• CaptchaConfig.java

package com.example.learn.config;


import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.google.code.kaptcha.util.Config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.util.Properties;

import static com.google.code.kaptcha.Constants.*;

@Configuration
public class CaptchaConfig {

    @Bean(name = "captchaProducer")
    public DefaultKaptcha getKaptchaBean()
    {
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        Properties properties = new Properties();
        // 是否有边框 默认为true 我们可以自己设置yes，no
        properties.setProperty(KAPTCHA_BORDER, "yes");
        // 验证码文本字符颜色 默认为Color.BLACK
        properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_COLOR, "black");
        // 验证码图片宽度 默认为200
        properties.setProperty(KAPTCHA_IMAGE_WIDTH, "160");
        // 验证码图片高度 默认为50
        properties.setProperty(KAPTCHA_IMAGE_HEIGHT, "60");
        // 验证码文本字符大小 默认为40
        properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_SIZE, "38");
        // KAPTCHA_SESSION_KEY
        properties.setProperty(KAPTCHA_SESSION_CONFIG_KEY, "kaptchaCode");
        // 验证码文本字符长度 默认为5
        properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "4");
        // 验证码文本字体样式 默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)
        properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_NAMES, "Arial,Courier");
        // 图片样式 水纹com.google.code.kaptcha.impl.WaterRipple 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy 阴影com.google.code.kaptcha.impl.ShadowGimpy
        properties.setProperty(KAPTCHA_OBSCURIFICATOR_IMPL, "com.google.code.kaptcha.impl.ShadowGimpy");
        Config config = new Config(properties);
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }

    @Bean(name = "captchaProducerMath")
    public DefaultKaptcha getKaptchaBeanMath()
    {
        DefaultKaptcha defaultKaptcha = new DefaultKaptcha();
        Properties properties = new Properties();
        // 是否有边框 默认为true 我们可以自己设置yes，no
        properties.setProperty(KAPTCHA_BORDER, "yes");
        // 边框颜色 默认为Color.BLACK
        properties.setProperty(KAPTCHA_BORDER_COLOR, "105,179,90");
        // 验证码文本字符颜色 默认为Color.BLACK
        properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_COLOR, "blue");
        // 验证码图片宽度 默认为200
        properties.setProperty(KAPTCHA_IMAGE_WIDTH, "160");
        // 验证码图片高度 默认为50
        properties.setProperty(KAPTCHA_IMAGE_HEIGHT, "60");
        // 验证码文本字符大小 默认为40
        properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_SIZE, "35");
        // KAPTCHA_SESSION_KEY
        properties.setProperty(KAPTCHA_SESSION_CONFIG_KEY, "kaptchaCodeMath");
        // 验证码文本生成器 【这个要修改为自己项目的包路径】
        properties.setProperty(KAPTCHA_TEXTPRODUCER_IMPL, "com.example.learn.config.KaptchaTextCreator");
        // 验证码文本字符间距 默认为2
        properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_SPACE, "3");
        // 验证码文本字符长度 默认为5
        properties.setProperty(KAPTCHA_TEXTPRODUCER_CHAR_LENGTH, "6");
        // 验证码文本字体样式 默认为new Font("Arial", 1, fontSize), new Font("Courier", 1, fontSize)
        properties.setProperty(KAPTCHA_TEXTPRODUCER_FONT_NAMES, "Arial,Courier");
        // 验证码噪点颜色 默认为Color.BLACK
        properties.setProperty(KAPTCHA_NOISE_COLOR, "white");
        // 干扰实现类
        properties.setProperty(KAPTCHA_NOISE_IMPL, "com.google.code.kaptcha.impl.NoNoise");
        // 图片样式 水纹com.google.code.kaptcha.impl.WaterRipple 鱼眼com.google.code.kaptcha.impl.FishEyeGimpy 阴影com.google.code.kaptcha.impl.ShadowGimpy
        properties.setProperty(KAPTCHA_OBSCURIFICATOR_IMPL, "com.google.code.kaptcha.impl.ShadowGimpy");
        Config config = new Config(properties);
        defaultKaptcha.setConfig(config);
        return defaultKaptcha;
    }
}

• KaptchaTextCreator

package com.example.learn.config;

import com.google.code.kaptcha.text.impl.DefaultTextCreator;

import java.util.Random;

/**
 * 验证码文本生成器
 *
 * @author ruoyi
 */
public class KaptchaTextCreator extends DefaultTextCreator
{
    private static final String[] CNUMBERS = "0,1,2,3,4,5,6,7,8,9,10".split(",");

    @Override
    public String getText()
    {
        Integer result = 0;
        Random random = new Random();
        int x = random.nextInt(10);
        int y = random.nextInt(10);
        StringBuilder suChinese = new StringBuilder();
        int randomoperands = random.nextInt(3);
        if (randomoperands == 0)
        {
            result = x * y;
            suChinese.append(CNUMBERS[x]);
            suChinese.append("*");
            suChinese.append(CNUMBERS[y]);
        }
        else if (randomoperands == 1)
        {
            if ((x != 0) && y % x == 0)
            {
                result = y / x;
                suChinese.append(CNUMBERS[y]);
                suChinese.append("/");
                suChinese.append(CNUMBERS[x]);
            }
            else
            {
                result = x + y;
                suChinese.append(CNUMBERS[x]);
                suChinese.append("+");
                suChinese.append(CNUMBERS[y]);
            }
        }
        else
        {
            if (x >= y)
            {
                result = x - y;
                suChinese.append(CNUMBERS[x]);
                suChinese.append("-");
                suChinese.append(CNUMBERS[y]);
            }
            else
            {
                result = y - x;
                suChinese.append(CNUMBERS[y]);
                suChinese.append("-");
                suChinese.append(CNUMBERS[x]);
            }
        }
        suChinese.append("=?@" + result);
        return suChinese.toString();
    }
}

简单使用

后端控制器

• CaptchaController

package com.example.learn.controller;


import cn.hutool.core.util.IdUtil;
import com.example.learn.common.returns.CommonResult;
import com.google.code.kaptcha.Producer;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Base64;
import java.util.concurrent.TimeUnit;

/**
 *  验证码操作处理
 */

@RestController
public class CaptchaController {

    @Resource(name = "captchaProducer")
    private Producer captchaProducer;
    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;
    
/*    @Autowired
    private StringRedisTemplate redisTemplate;*/

    // 验证码类型可以是char/math
    public static String CAPTCHA_TYPE = "char";
    
    public static String CAPTCHA_KEY_PREFIX = "captcha:";

    @GetMapping(value = "/captchaImage")
    public CommonResult captchaImage() {
        String capStr = null;
        String code = null;
        BufferedImage image = null;
        if ("math".equals(CAPTCHA_TYPE)) {
            // 1+2=?@3
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        } else if ("char".equals(CAPTCHA_TYPE)) {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }
        // 转换流信息写出
        ByteArrayOutputStream os = new ByteArrayOutputStream();
        try {
            ImageIO.write(image,"jpg",os);
        } catch (IOException e) {
            return CommonResult.error(e.getMessage());
        }
        // 若用到了redis，放开下面注释代码，并且联调时前端需要把返回的uuid传回来
        String uuid = IdUtil.simpleUUID();
        /*String captchaKey = CAPTCHA_KEY_PREFIX + uuid;
        // 将code到redis中
        redisTemplate.opsForValue().set(captchaKey,code,2, TimeUnit.MINUTES);*/
        
        CommonResult commonResult = CommonResult.success();
        commonResult.put("uuid",uuid);
        commonResult.put("img", Base64.getEncoder().encodeToString(os.toByteArray()));
        return commonResult;
    }
}

前端页面

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>显示 Base64 图片</title>
    <style>
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 20px;
        }
        .image-container {
            margin-top: 20px;
            text-align: center;
        }
        img {
            max-width: 100%;
            height: auto;
            border: 1px solid #ddd;
            border-radius: 4px;
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>显示 Base64 图片</h1>
        <div class="image-container">
            <img id="base64Image" src="" alt="Base64 图片">
        </div>
        <button onclick="loadImage()">加载图片</button>
    </div>

    <script>
        // 模拟从后端获取的 Base64 数据
        function getBase64ImageData() {
            // 这里是一个示例的 Base64 图片数据（一个简单的 PNG 图片）
            return '/9j/4AAQSkZJRgABAgAAAQABAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCAA8AKADASIAAhEBAxEB/8QAHwAAAQUBAQEBAQEAAAAAAAAAAAECAwQFBgcICQoL/8QAtRAAAgEDAwIEAwUFBAQAAAF9AQIDAAQRBRIhMUEGE1FhByJxFDKBkaEII0KxwRVS0fAkM2JyggkKFhcYGRolJicoKSo0NTY3ODk6Q0RFRkdISUpTVFVWV1hZWmNkZWZnaGlqc3R1dnd4eXqDhIWGh4iJipKTlJWWl5iZmqKjpKWmp6ipqrKztLW2t7i5usLDxMXGx8jJytLT1NXW19jZ2uHi4+Tl5ufo6erx8vP09fb3+Pn6/8QAHwEAAwEBAQEBAQEBAQAAAAAAAAECAwQFBgcICQoL/8QAtREAAgECBAQDBAcFBAQAAQJ3AAECAxEEBSExBhJBUQdhcRMiMoEIFEKRobHBCSMzUvAVYnLRChYkNOEl8RcYGRomJygpKjU2Nzg5OkNERUZHSElKU1RVVldYWVpjZGVmZ2hpanN0dXZ3eHl6goOEhYaHiImKkpOUlZaXmJmaoqOkpaanqKmqsrO0tba3uLm6wsPExcbHyMnK0tPU1dbX2Nna4uPk5ebn6Onq8vP09fb3+Pn6/9oADAMBAAIRAxEAPwDtrW1ga1hZoIySikkoOeKsCztv+feL/vgU2z/484P+ua/yqyKiMY8q0IjGPKtCIWdr/wA+0P8A3wKeLK1/59of+/YqUU4U+WPYfLHsRCytP+fWH/v2KcLG0/59YP8Av2Kh1HVLPSLGS8vp1hgjGWY/yA7n2qp4e8T6b4ltHuLB2wjbXSQAMp7ZGT1rVYabpuqoe6tL20C0b2NQWFn/AM+sH/fsU4WFn/z6Qf8AfsVT1rXLPQNNa/vmcQqyqdi7jycdP1/CtGCeO4hSWJg0bqGVh3B5FS6NoqfLo9L+n/DoOWPYaNPsv+fS3/79j/CnDTrL/nzt/wDv0v8AhTZdQtLe6htpbiNJ5s+UjNgvjk49ay/EHjHSfDQhW9kd55yBHBCAztzjOCRge5NVTw0qklCEbt7aA1FbmyNOsf8Anzt/+/S/4U4abY/8+Vv/AN+l/wAKmRgw4qQVlyx7Byx7FcaZYf8APlbf9+l/wp40yw/58bb/AL9L/hVgUu4DvRyx7Byx7EA0vT/+fG2/78r/AIU8aVp//Pha/wDflf8ACsF/H3h+PxKugm9BvC2wkD5Ff+4W/ve3rx1rqFIYcVrUw06VvaQtdXV1ugSi9iuNK07/AJ8LX/vyv+FOGk6d/wBA+1/78r/hVoU8Vlyx7Byx7FUaTpv/AED7T/vyv+FVtT0vT49IvXSxtVdYHKsIVBB2nkcVrCqurf8AIFv/APr3k/8AQTSlGPK9BSjHlehyVn/x5wf9c1/lVkVXs/8Ajzg/65r/ACqyKcfhQ4/ChwqG7mMMDsmN+07c+tTgVTv4mkhIFUUeIXGr33ijxB9n1iRza25Zvs/3RxxzTvDOtJ4c8bSJCdtlcN5TLngZ6H8D/M11es6YtotxdtGoIUszAcnHNeSF3ln39WZs195lUlmcasOXkpKCjy9LvW/rocs/ct3PQfHGq6zf3v2Vp1W3llxBarjlV/iY+5rrPBPja41Qx2Fzp7x7IuJ1+58vGD6GsqLSmvooblkDTBAN5HIqxpmhXdnqoube5eKGTmeADhzjgj0PrXz0sdh62F+rzgk4p2eu/wAu6S36776bcrUrpnN/FXUpZ/EVsqyECGIMhU4wcnn61n+HrSzm1OC/8QX5lnkZTEskxJJHQs3X8K0/HmkS3M63KKTIgxj1FcxZ6I93ZSPIzrcAfu1bgcdq9zC43DSyynS9r7Nr3ZWXva9uy6t/IylGXO3a59Hw6lb2tkbi6njhiVdzPIwUAeuTXH2vxl0SfXjZNBNFYltiXznAJ9SuMqvv19QOccPpurW/irw0mg6szi6tGDRuPvMq8d++Mg/nWVL4itpYP7Pn0ZYtGzsjIQh0I/iz/e9e/qT387D5RCEqlGtBzmuzSsujjf4m+i8mW6j0aZ9CPrun+fHbJeQtcSxmVI1cEsoxz9Oa8O8TS+K7DxBNDHqtw1veyEJJG5C89iP4TVPSLvR/C90l3YtJquoyHbCiDAjU8HpnLY4/oK9Nk0tdRgS7jDbJFDAMMEexHY+1YKTyqp7SnHnhJW96NrvyTu1bz31H/EVmeV65pul6Po0CW7N/aKuGE2cMx7n2HpXt3w88Vr4l8PwzSMPtUX7ucf7QHX8eteFeN7W4h15w6N5CooRscAd/1zXefB+2lsluZGPE7LgD0Gf8a9DMYwqZPCtWqc1Ru6+e8fktbEQ0qNJaHt4p4qOI5QVKK+QOgcKq6t/yBL//AK9pP/QTVsVV1f8A5Al//wBe0n/oJqZfCyZfCzkrP/jyg/65r/KrIqvZf8eUH/XNf5VZFEfhQR+FDhSlQRzQKcBVFHI+MbbzdJuYkHLxso/EV4TCradfIbuFsKckf4V9KanYi6gZcda831fwj5sjBotyk5xXsZXmv1OMqNSN6c97aP5MznDm1W5maD4q1q91qKWysHl0uAbJoUAJKnq2T1YdQB9O+a9ftbaC5iSaLDI6hlPqDXFeHdEks1SOOPy416KBXoNjD5UQGMd65MdiKNaa9jTUIrRd2vPzKimt2c/rmhR3MLZHbqK8i1LR/EGn30zw3CPH/Ccgcf7p6GvoSeASxkYrktX8OG4DEDrU4TGSwsm1GMr9JK4SjzHgSXM8WqxzhSlwsgyBxk16lcaGby2ZXjDxuMFSOtRx+Cx/akc8kO5kbKmvTdM0tRaqrr2rvzXNYY32UoQ5ZQVn+lvJdPUmEOW9zzTw14Sh0y/86KJzKeA7nJUegr1S0tCbTDDnFWIdMijbIUVoJGFXAFeVWr1K8+erJyfdlpJaI8m8aeGprtHaA7ZR8yZ+6x9D7Gqnwx1zTjqA0Ropra9XcRHLgjI+8qnrxycH0PpXqOq2ImiOBzXL6T4dtLPXn1JLOMXb8NNjn049Pwroo16SoTpVYt9YtdH591+XTdiad7o9DiHyipRUFvnyxmrAriKHCqur/wDIEv8A/r2k/wDQTVsVV1f/AJAl/wD9e0n/AKCamXwsmXws5Ky/48rf/rmv8qsiuZi1q5iiSNUiIRQoyD2/GpP7fuv+ecP/AHyf8ayjWjZGcasbI6UU4VzP/CQ3f/POD/vk/wCNL/wkV3/zzg/75P8AjVe2iP20Tp9uaiezjkPKiue/4SS8/wCeUH/fJ/xpf+ElvP8AnlB/3yf8aPbRD20TpIrSOPooq0qgVyX/AAk97/zyt/8Avlv8aX/hKL3/AJ5W/wD3y3+NHtoh7aJ14FBjVhyK5H/hKr7/AJ5W/wD3y3+NL/wld9/zytv++W/xo9tEPbROp+xRls7RVqOMIMCuN/4S2/8A+eNt/wB8t/jS/wDCX6h/zxtv++W/+Ko9tEPbRO2FPFcP/wAJhqH/ADxtf++W/wDiqX/hMtR/542v/fLf/FUe2iHtoncMgYYIqNbRA2dorjP+Ez1H/nja/wDfDf8AxVL/AMJrqX/PC0/74b/4qj20Q9tE7xFwKkFcB/wm2pf88LT/AL4b/wCKpf8AhONT/wCeFp/3w3/xVHtoh7aJ6CKq6v8A8gPUP+vaT/0E1xX/AAnOp/8APC0/74b/AOKqO58Z6jdWs1u8NqElRkYqrZAIxx81TKtGzFKrGzP/2Q==';
        }

        // 加载图片
        function loadImage() {
            const base64Data = getBase64ImageData();
            const img = document.getElementById('base64Image');
            img.src = 'data:image/jpg;base64,' + base64Data;
        }

        // 页面加载时直接显示图片
        window.onload = function() {
            loadImage();
        };
    </script>
</body>
</html>

说明： 将后端接口返回的img的值复制到前端页面的 function getBase64ImageData()中

效果：

• 验证码类型：math
  
• 验证码类型：char
  

其他相关代码

• pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.example</groupId>
    <artifactId>learn</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>learn</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.5.15</spring-boot.version>
        <spring-framework.version>5.3.39</spring-framework.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- redis 缓存操作 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
            <version>${spring-boot.version}</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/pro.fessional/kaptcha -->
        <dependency>
            <groupId>pro.fessional</groupId>
            <artifactId>kaptcha</artifactId>
            <version>2.3.3</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/cn.hutool/hutool-all -->
        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.8.36</version>
        </dependency>


    </dependencies>
    <dependencyManagement>
        <dependencies>
            <!-- 覆盖SpringFramework的依赖配置-->
            <dependency>
                <groupId>org.springframework</groupId>
                <artifactId>spring-framework-bom</artifactId>
                <version>${spring-framework.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <configuration>
                    <mainClass>com.example.learn.LearnApplication</mainClass>
                    <skip>true</skip>
                </configuration>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>public</id>
            <name>aliyun nexus</name>
            <url>https://maven.aliyun.com/repository/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>public</id>
            <name>aliyun nexus</name>
            <url>https://maven.aliyun.com/repository/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>

• CommonResult.java

package com.example.learn.common.returns;

import java.util.HashMap;
import java.util.Objects;

public class CommonResult extends HashMap<String, Object> {


    // 状态码
    public static final String CODE_TAG = "code";

    // 返回内容
    public static final String MSG_TAG = "msg";

    // 数据对象
    public static final String DATA_TAG = "data";

    /**
     *  初始化一个新创建的 CommonResult 对象，使其表示一个空消息。
     */
    public CommonResult() {
    }

    /**
     * 初始化一个新创建的 CommonResult 对象
     * @param code 状态码
     * @param msg 返回内容
     */
    public CommonResult(int code, String msg) {
        super.put(CODE_TAG, code);
        super.put(MSG_TAG, msg);
    }

    /**
     * 初始化一个新创建的 CommonResult 对象
     *
     * @param code 状态码
     * @param msg 返回内容
     * @param data 数据对象
     */
    public CommonResult(int code, String msg, Object data)
    {
        super.put(CODE_TAG, code);
        super.put(MSG_TAG, msg);
        super.put(DATA_TAG, data);
    }

    /**
     * 返回成功消息
     *
     * @return 成功消息
     */
    public static CommonResult success()
    {
        return CommonResult.success("操作成功");
    }

    /**
     * 返回成功数据
     *
     * @return 成功消息
     */
    public static CommonResult success(Object data)
    {
        return CommonResult.success("操作成功", data);
    }

    /**
     * 返回成功消息
     *
     * @param msg 返回内容
     * @return 成功消息
     */
    public static CommonResult success(String msg)
    {
        return CommonResult.success(msg, null);
    }

    /**
     * 返回成功消息
     *
     * @param msg 返回内容
     * @param data 数据对象
     * @return 成功消息
     */
    public static CommonResult success(String msg, Object data)
    {
        return new CommonResult(HttpStatus.SUCCESS, msg, data);
    }

    /**
     * 返回警告消息
     *
     * @param msg 返回内容
     * @return 警告消息
     */
    public static CommonResult warn(String msg)
    {
        return CommonResult.warn(msg, null);
    }

    /**
     * 返回警告消息
     *
     * @param msg 返回内容
     * @param data 数据对象
     * @return 警告消息
     */
    public static CommonResult warn(String msg, Object data)
    {
        return new CommonResult(HttpStatus.WARN, msg, data);
    }

    /**
     * 返回错误消息
     *
     * @return 错误消息
     */
    public static CommonResult error()
    {
        return CommonResult.error("操作失败");
    }

    /**
     * 返回错误消息
     *
     * @param msg 返回内容
     * @return 错误消息
     */
    public static CommonResult error(String msg)
    {
        return CommonResult.error(msg, null);
    }

    /**
     * 返回错误消息
     *
     * @param msg 返回内容
     * @param data 数据对象
     * @return 错误消息
     */
    public static CommonResult error(String msg, Object data)
    {
        return new CommonResult(HttpStatus.ERROR, msg, data);
    }

    /**
     * 返回错误消息
     *
     * @param code 状态码
     * @param msg 返回内容
     * @return 错误消息
     */
    public static CommonResult error(int code, String msg)
    {
        return new CommonResult(code, msg, null);
    }

    /**
     * 是否为成功消息
     *
     * @return 结果
     */
    public boolean isSuccess()
    {
        return Objects.equals(HttpStatus.SUCCESS, this.get(CODE_TAG));
    }

    /**
     * 是否为警告消息
     *
     * @return 结果
     */
    public boolean isWarn()
    {
        return Objects.equals(HttpStatus.WARN, this.get(CODE_TAG));
    }

    /**
     * 是否为错误消息
     *
     * @return 结果
     */
    public boolean isError()
    {
        return Objects.equals(HttpStatus.ERROR, this.get(CODE_TAG));
    }

    /**
     * 方便链式调用
     *
     * @param key 键
     * @param value 值
     * @return 数据对象
     */
    @Override
    public CommonResult put(String key, Object value)
    {
        super.put(key, value);
        return this;
    }
}

• HttpStatus.java

package com.example.learn.common.returns;

/**
 * 返回状态码
 * 
 * @author ruoyi
 */
public class HttpStatus
{
    /**
     * 操作成功
     */
    public static final int SUCCESS = 200;

    /**
     * 对象创建成功
     */
    public static final int CREATED = 201;

    /**
     * 请求已经被接受
     */
    public static final int ACCEPTED = 202;

    /**
     * 操作已经执行成功，但是没有返回数据
     */
    public static final int NO_CONTENT = 204;

    /**
     * 资源已被移除
     */
    public static final int MOVED_PERM = 301;

    /**
     * 重定向
     */
    public static final int SEE_OTHER = 303;

    /**
     * 资源没有被修改
     */
    public static final int NOT_MODIFIED = 304;

    /**
     * 参数列表错误（缺少，格式不匹配）
     */
    public static final int BAD_REQUEST = 400;

    /**
     * 未授权
     */
    public static final int UNAUTHORIZED = 401;

    /**
     * 访问受限，授权过期
     */
    public static final int FORBIDDEN = 403;

    /**
     * 资源，服务未找到
     */
    public static final int NOT_FOUND = 404;

    /**
     * 不允许的http方法
     */
    public static final int BAD_METHOD = 405;

    /**
     * 资源冲突，或者资源被锁
     */
    public static final int CONFLICT = 409;

    /**
     * 不支持的数据，媒体类型
     */
    public static final int UNSUPPORTED_TYPE = 415;

    /**
     * 系统内部错误
     */
    public static final int ERROR = 500;

    /**
     * 接口未实现
     */
    public static final int NOT_IMPLEMENTED = 501;

    /**
     * 系统警告消息
     */
    public static final int WARN = 601;
}

参考

• kaptcha验证码组件
• RuoYi-Vue-v3.8.9