EasyCaptcha的简单教程-gitee.com

一、简介

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。

二、引入依赖

        <!--        引入验证码依赖--><dependency><groupId>com.github.whvcse</groupId><artifactId>easy-captcha</artifactId><version>1.6.2</version></dependency>

三、生成几种类型验证码

1. 算术型验证码

controller

package com.zhuang.captcha.controller;import com.wf.captcha.ArithmeticCaptcha;
import com.wf.captcha.utils.CaptchaUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;import java.io.FileOutputStream;
import java.io.IOException;import static java.awt.Font.*;/*** @program: leanings* @description: 验证码* @author: mrzhuang* @create: 2022-08-11 21:09**/@Slf4j
@RestController
@RequestMapping("/captcha")
public class EasyCaptchaController {@RequestMapping("/getCaparithmetictcha")public void   arithmetic(HttpServletResponse response) throws IOException {//创建算术类型的验证码ArithmeticCaptcha arithmeticCaptcha = new ArithmeticCaptcha(130,80,2);int height = arithmeticCaptcha.getHeight();int width = arithmeticCaptcha.getWidth();int len = arithmeticCaptcha.getLen();log.info("算术验证码的宽{},高{},算术个数{}", height, width, len);//获得算术验证码的结果（如：15）String text = arithmeticCaptcha.text();log.info("验证码的结果为：{}", text);//将获得的验证码的结果转化为字符（如：'1','6'）char[] chars = arithmeticCaptcha.textChar();System.out.print("chars[]: " + "\t");for (int i = 0; i < chars.length; i++) {System.out.print(chars[i] + "\t");}System.out.println();String toBase64 = arithmeticCaptcha.toBase64();//获取算术型验证码字符串（如："9+6=?"）String arithmeticString = arithmeticCaptcha.getArithmeticString();log.info("chars.length:{},toBase64:{},arithmeticString:{}", chars.length, toBase64, arithmeticString);FileOutputStream fileOutputStream = new FileOutputStream("/Users/mrzhuang/Downloads/captcha.png");boolean out = arithmeticCaptcha.out(fileOutputStream);if (out){log.info("验证码写入图片图片成功！");}//将算术性型验证码写入到response中boolean out1 = arithmeticCaptcha.out(response.getOutputStream());if (out1){log.info("验证码写入response成功！");}}}

CaptchaUtil类

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//package com.wf.captcha.utils;import com.wf.captcha.SpecCaptcha;
import com.wf.captcha.base.Captcha;
import java.awt.Font;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public class CaptchaUtil {private static final String SESSION_KEY = "captcha";private static final int DEFAULT_LEN = 4;private static final int DEFAULT_WIDTH = 130;private static final int DEFAULT_HEIGHT = 48;public CaptchaUtil() {}public static void out(HttpServletRequest request, HttpServletResponse response) throws IOException {out(4, request, response);}public static void out(int len, HttpServletRequest request, HttpServletResponse response) throws IOException {out(130, 48, len, request, response);}public static void out(int width, int height, int len, HttpServletRequest request, HttpServletResponse response) throws IOException {out(width, height, len, (Font)null, request, response);}public static void out(Font font, HttpServletRequest request, HttpServletResponse response) throws IOException {out(130, 48, 4, font, request, response);}public static void out(int len, Font font, HttpServletRequest request, HttpServletResponse response) throws IOException {out(130, 48, len, font, request, response);}public static void out(int width, int height, int len, Font font, HttpServletRequest request, HttpServletResponse response) throws IOException {SpecCaptcha specCaptcha = new SpecCaptcha(width, height, len);if (font != null) {specCaptcha.setFont(font);}out((Captcha)specCaptcha, request, response);}// 将验证码以"captcha"为key，以验证码的值为value，放入请求的session中public static void out(Captcha captcha, HttpServletRequest request, HttpServletResponse response) throws IOException {setHeader(response);request.getSession().setAttribute("captcha", captcha.text().toLowerCase());captcha.out(response.getOutputStream());}
// 取出请求的session中的验证码，与页面填入的值进行验证public static boolean ver(String code, HttpServletRequest request) {if (code != null) {String captcha = (String)request.getSession().getAttribute("captcha");return code.trim().toLowerCase().equals(captcha);} else {return false;}}public static void clear(HttpServletRequest request) {request.getSession().removeAttribute("captcha");}public static void setHeader(HttpServletResponse response) {response.setContentType("image/gif");response.setHeader("Pragma", "No-cache");response.setHeader("Cache-Control", "no-cache");response.setDateHeader("Expires", 0L);}
}```

1.1 结果

方式一：写入response体

方式二：写入png文件

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使用easy-captcha工具获得验证码

一、简介

二、引入依赖

三、生成几种类型验证码

1. 算术型验证码

1.1 结果

方式一：写入response体

方式二：写入png文件

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