SpringBoot学习(九):验证码(EasyCaptcha)使用

1. 什么是EasyCaptcha？

Java图形验证码，支持gif、中文、算术等类型，可用于Java Web、JavaSE等项目。

源码地址: https://github.com/whvcse/EasyCaptcha

2. 添加依赖

<dependency>
  <groupId>com.github.whvcse</groupId>
  <artifactId>easy-captcha</artifactId>
  <version>1.6.2</version>
</dependency>

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以下内容是对EasyCaptcha封装，生成的验证码储存到redis中。

3. 创建验证码接口

新建文件: EasyCaptchaService.java

package com.hui.javalearn.service;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 验证码类
 * https://github.com/whvcse/EasyCaptcha
 */
public interface EasyCaptchaService {
    /**
     * 验证码宽度
     */
    Integer CAPTCHA_WIDTH = 130;
    /**
     * 验证码高度
     */
    Integer CAPTCHA_HEIGHT = 48;

    /**
     * 验证码长度
     */
    Integer CAPTCHA_LENGTH = 4;

    /**
     * 验证码缓存key前缀
     */
    String CAPTCHA_KEY_PRE = "CAPTCHA:LIST:";

    /**
     * 验证码缓存时间
     */
    Integer CAPTCHA_CACHE_TIME = 120;

    /**
     * 验证码类型: 默认图片
     * */
     int CAPTCHA_TYPE_DEFAULT_PNG = 10;
    /**
     * 验证码类型: 动态GIF
     * */
    final int CAPTCHA_TYPE_GIF = 20;
    /**
     * 验证码类型: 中文
     * */
    final int CAPTCHA_TYPE_CHINESE = 30;
    /**
     * 验证码类型: 动态中文
     * */
    final int CAPTCHA_TYPE_GIF_CHINESE = 40;
    /**
     * 验证码类型: 算术
     * */
    final int CAPTCHA_TYPE_ARITHMETIC = 50;

    /**
     * 生成普通图片验证码
     * @param uuid
     * @param request
     * @param response
     * @return
     */
    String outputCaptchaImg(String uuid, Integer type,HttpServletRequest request, HttpServletResponse response) throws IOException;

    /**
     * 校验图片验证码
     * @param uuid
     * @param captchaCode
     * @return
     */
    boolean verifyCaptchaCode(String uuid,String captchaCode);
}

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4. 实现验证码接口

新建文件: EasyCaptchaServiceImpl.java

package com.hui.javalearn.service.Impl;

import com.hui.javalearn.common.enums.ResultEnum;
import com.hui.javalearn.exception.ApiException;
import com.hui.javalearn.service.EasyCaptchaService;
import com.wf.captcha.*;
import com.wf.captcha.utils.CaptchaUtil;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.concurrent.TimeUnit;

@Service
public class EasyCaptchaServiceImpl implements EasyCaptchaService {
    /**
     * 注入redis
     */
    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    /**
     * 保存验证码到缓存
     *
     * @param uuid
     * @param codeValue
     */
    private void saveCaptcha2Cache(String uuid, String codeValue) {
        stringRedisTemplate.opsForValue().set(CAPTCHA_KEY_PRE + uuid, codeValue, CAPTCHA_CACHE_TIME, TimeUnit.SECONDS);
    }

    /**
     *
     * @param uuid
     * @param type
     * @param request
     * @param response
     * @return
     * @throws IOException
     */
    @Override
    public String outputCaptchaImg(String uuid, Integer type, HttpServletRequest request, HttpServletResponse response) throws IOException {
        String codeValue="";
        switch (type) {
            case CAPTCHA_TYPE_DEFAULT_PNG:
                SpecCaptcha specCaptcha = new SpecCaptcha(CAPTCHA_WIDTH,CAPTCHA_HEIGHT,CAPTCHA_LENGTH);
                codeValue = specCaptcha.text().toLowerCase();
                CaptchaUtil.out(specCaptcha,request,response);
                break;
            case CAPTCHA_TYPE_GIF:
                GifCaptcha gifCaptcha = new GifCaptcha(CAPTCHA_WIDTH, CAPTCHA_HEIGHT, CAPTCHA_LENGTH);
                codeValue = gifCaptcha.text().toLowerCase();
                CaptchaUtil.out(gifCaptcha,request,response);
                break;
            case CAPTCHA_TYPE_CHINESE:
                ChineseCaptcha chineseCaptcha = new ChineseCaptcha(CAPTCHA_WIDTH,CAPTCHA_HEIGHT,CAPTCHA_LENGTH);
                codeValue = chineseCaptcha.text();
                CaptchaUtil.out(chineseCaptcha,request,response);
                break;
            case CAPTCHA_TYPE_GIF_CHINESE:
                ChineseGifCaptcha chineseGifCaptcha = new ChineseGifCaptcha(CAPTCHA_WIDTH, CAPTCHA_HEIGHT, CAPTCHA_LENGTH);
                codeValue = chineseGifCaptcha.text();
                CaptchaUtil.out(chineseGifCaptcha,request,response);
                break;
            case CAPTCHA_TYPE_ARITHMETIC:
                ArithmeticCaptcha arithmeticCaptcha = new ArithmeticCaptcha(CAPTCHA_WIDTH,CAPTCHA_HEIGHT);
                codeValue = arithmeticCaptcha.text();
                CaptchaUtil.out(arithmeticCaptcha,request,response);
                break;
            default:
                throw new IOException("类型不存在");
        }
        saveCaptcha2Cache(uuid,codeValue);
        return codeValue;
    }

    /**
     * 校验图片验证码
     * @param uuid
     * @param captchaCode
     * @return
     */
    @Override
    public boolean verifyCaptchaCode(String uuid, String captchaCode) {
        String cacheCaptchaCode = stringRedisTemplate.opsForValue().get(CAPTCHA_KEY_PRE + uuid);
        if (StringUtils.isBlank(cacheCaptchaCode)) {
            throw new ApiException(ResultEnum.ERROR.getCode(),"图形验证码超时,请重新获取！");
        }
        if (!cacheCaptchaCode.equals(captchaCode.toLowerCase())){
            throw new ApiException(ResultEnum.ERROR.getCode(),"图形验证码输入不正确！");
        }
        return true;
    }
}

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5. 使用

5.1 生成验证码

新建文件: CaptchaController.java

package com.hui.javalearn.controller;

import com.hui.javalearn.service.EasyCaptchaService;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
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.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.constraints.NotEmpty;
import java.io.IOException;

@Api(tags = "验证码")
@RestController
@RequestMapping("/captcha")
public class CaptchaController {

    @Autowired
    private EasyCaptchaService captchaService;

    @GetMapping("/generate")
    @ApiOperation("生成验证码")
    public void generate(
            HttpServletRequest request,
            HttpServletResponse response,
            @NotEmpty(message = "uuid不能为空") @RequestParam("uuid") String uuid
    ) throws IOException {
        captchaService.outputCaptchaImg(uuid,EasyCaptchaService.CAPTCHA_TYPE_GIF,request,response);
    }
}

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5.2 校验验证码

...
// 校验图片验证码
easyCaptchaService.verifyCaptchaCode(uuid,captchaCode);
...

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