SpringBoot 图形验证码的生成和校验
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2022-06-24 22:19:47
1. 编写工具类package com.cn.beauty.util;import org.slf4j.logger;import org.slf4j.loggerfactory;import jav...
1. 编写工具类
package com.cn.beauty.util; import org.slf4j.logger; import org.slf4j.loggerfactory; import javax.imageio.imageio; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import javax.servlet.http.httpsession; import java.awt.*; import java.awt.image.bufferedimage; import java.util.arraylist; import java.util.random; public class randomvalidatecodeutil { public static final string randomcodekey = "meishang-login-randomvalidatecodekey";//放到session中的key private string randstring = "0123456789abcdefghijklmnopqrstuvwxyz";//随机产生数字与字母组合的字符串 private int width = 95;// 图片宽 private int height = 40;// 图片高 private int stringnum = 4;// 随机产生字符数量 private static final logger logger = loggerfactory.getlogger(randomvalidatecodeutil.class); private random random = new random(); /** * 获得字体 */ private font getfont() { return new font("wide latin", font.plain, 18); } /** * 获得颜色(粉色为主) */ private color getrandcolor() { arraylist<color> colors = new arraylist<color>(); colors.add(new color(241, 158, 194)); colors.add(new color(255, 94, 226)); colors.add(new color(255, 156, 177)); colors.add(new color(245, 152, 217)); colors.add(new color(255, 85, 81)); colors.add(new color(245, 152, 251)); int num = random.nextint(6); return colors.get(num); } /** * 生成随机图片 */ public void getrandcode(httpservletrequest request, httpservletresponse response) { httpsession session = request.getsession(); // bufferedimage类是具有缓冲区的image类,image类是用于描述图像信息的类 bufferedimage image = new bufferedimage(width, height, bufferedimage.type_int_bgr); graphics g = image.getgraphics();// 产生image对象的graphics对象,改对象可以在图像上进行各种绘制操作 g.fillrect(0, 0, width, height);//图片大小 g.setfont(new font("wide latin", font.plain, 18));//字体大小 g.setcolor(getrandcolor());//字体颜色 // 添加噪点 float yawprate = 0.01f;// 噪声率 int area = (int) (yawprate * width * height); for (int i = 0; i < area; i++) { int x = random.nextint(width); int y = random.nextint(height); image.setrgb(x, y, random.nextint(255)); } // 绘制随机字符 string randomstring = ""; for (int i = 1; i <= stringnum; i++) { randomstring = drowstring(g, randomstring, i); } logger.info(randomstring); //将生成的随机字符串保存到session中 session.removeattribute(randomcodekey); session.setattribute(randomcodekey, randomstring); g.dispose(); try { // 将内存中的图片通过流动形式输出到客户端 imageio.write(image, "jpeg", response.getoutputstream()); } catch (exception e) { logger.error("将内存中的图片通过流动形式输出到客户端失败>>>> ", e); } } /** * 绘制字符串 */ private string drowstring(graphics g, string randomstring, int i) { g.setfont(getfont()); g.setcolor(getrandcolor()); string rand = string.valueof(getrandomstring(random.nextint(randstring .length()))); randomstring += rand; g.translate(random.nextint(3), random.nextint(3)); g.drawstring(rand, 20 * (i - 1) + 3, 25); return randomstring; } /** * 获取随机的字符 */ public string getrandomstring(int num) { return string.valueof(randstring.charat(num)); } }
2. 编写 controller 中的接口
/** * @description 生成验证码 */ @requestmapping(value = "/user/getverify") public void getverify(httpservletrequest request, httpservletresponse response) { try { //设置相应类型,告诉浏览器输出的内容为图片 response.setcontenttype("image/jpeg"); //设置响应头信息,告诉浏览器不要缓存此内容 response.setheader("pragma", "no-cache"); response.setheader("cache-control", "no-cache"); response.setdateheader("expire", 0); randomvalidatecodeutil randomvalidatecode = new randomvalidatecodeutil(); //输出验证码图片方法 randomvalidatecode.getrandcode(request, response); } catch (exception e) { log.error("获取验证码失败>>>>", e); } } /** * @description 校验验证码 */ @postmapping("/user/checkverify") public boolean checkverify(@requestparam string verifyinput, httpsession session) { try { // 从session中获取随机数 string inputstr = verifyinput; string random = (string) session.getattribute("meishang-login-randomvalidatecodekey"); if (random == null) { return false; } if (random.equalsignorecase(inputstr)) { return true; } else { return false; } } catch (exception e) { log.error("验证码校验失败", e); return false; } }
3. 获取验证码图片
访问获取验证码接口
http://127.0.0.1:8605/user/getverify
效果如下
另一种方法
1.添加依赖
<dependency> <groupid>com.github.penggle</groupid> <artifactid>kaptcha</artifactid> <version>2.3.2</version> </dependency> <dependency> <groupid>org.springframework.boot</groupid> <artifactid>spring-boot-starter-web</artifactid> </dependency>
项目结构
2.全部代码
usercontroller
package com.yzm.config; import java.util.hashmap; import javax.annotation.resource; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import org.springframework.stereotype.controller; import org.springframework.web.bind.annotation.requestmapping; import org.springframework.web.bind.annotation.requestparam; import org.springframework.web.bind.annotation.responsebody; import com.google.code.kaptcha.impl.defaultkaptcha; import com.yzm.utils.util; @controller public class testcontroler { @resource private defaultkaptcha captchaproducer; /** * 登录验证码sessionkey */ public static final string login_validate_code = "login_validate_code"; /** * 登录验证码图片 */ @requestmapping(value = {"/loginvalidatecode"}) public void loginvalidatecode(httpservletrequest request, httpservletresponse response) throws exception{ util.validatecode(request,response,captchaproducer,login_validate_code); } /** * 检查验证码是否正确 */ @requestmapping("/checkloginvalidatecode") @responsebody public hashmap checkloginvalidatecode(httpservletrequest request,@requestparam("validatecode")string validatecode) { string loginvalidatecode = request.getsession().getattribute(login_validate_code).tostring(); hashmap<string,object> map = new hashmap<string,object>(); if(loginvalidatecode == null){ map.put("status",null);//验证码过期 }else if(loginvalidatecode.equals(validatecode)){ map.put("status",true);//验证码正确 }else if(!loginvalidatecode.equals(validatecode)){ map.put("status",false);//验证码不正确 } map.put("code",200); return map; } } package com.yzm.controller; import java.util.properties; import org.springframework.context.annotation.bean; import org.springframework.stereotype.component; import com.google.code.kaptcha.impl.defaultkaptcha; import com.google.code.kaptcha.util.config; @component public class testconfig { @bean public defaultkaptcha getdefaultkaptcha() { defaultkaptcha defaultkaptcha = new defaultkaptcha(); properties properties = new properties(); // 图片边框 properties.setproperty("kaptcha.border", "no"); // 边框颜色 properties.setproperty("kaptcha.border.color", "black"); //边框厚度 properties.setproperty("kaptcha.border.thickness", "1"); // 图片宽 properties.setproperty("kaptcha.image.width", "200"); // 图片高 properties.setproperty("kaptcha.image.height", "50"); //图片实现类 properties.setproperty("kaptcha.producer.impl", "com.google.code.kaptcha.impl.defaultkaptcha"); //文本实现类 properties.setproperty("kaptcha.textproducer.impl", "com.google.code.kaptcha.text.impl.defaulttextcreator"); //文本集合,验证码值从此集合中获取 properties.setproperty("kaptcha.textproducer.char.string", "01234567890"); //验证码长度 properties.setproperty("kaptcha.textproducer.char.length", "4"); //字体 properties.setproperty("kaptcha.textproducer.font.names", "宋体"); //字体颜色 properties.setproperty("kaptcha.textproducer.font.color", "black"); //文字间隔 properties.setproperty("kaptcha.textproducer.char.space", "5"); //干扰实现类 properties.setproperty("kaptcha.noise.impl", "com.google.code.kaptcha.impl.defaultnoise"); //干扰颜色 properties.setproperty("kaptcha.noise.color", "blue"); //干扰图片样式 properties.setproperty("kaptcha.obscurificator.impl", "com.google.code.kaptcha.impl.waterripple"); //背景实现类 properties.setproperty("kaptcha.background.impl", "com.google.code.kaptcha.impl.defaultbackground"); //背景颜色渐变,结束颜色 properties.setproperty("kaptcha.background.clear.to", "white"); //文字渲染器 properties.setproperty("kaptcha.word.impl", "com.google.code.kaptcha.text.impl.defaultwordrenderer"); config config = new config(properties); defaultkaptcha.setconfig(config); return defaultkaptcha; } }
util
package com.yzm.utils; import java.awt.image.bufferedimage; import javax.imageio.imageio; import javax.servlet.servletoutputstream; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import com.google.code.kaptcha.impl.defaultkaptcha; public class util { /** * 生成验证码图片 * @param request 设置session * @param response 转成图片 * @param captchaproducer 生成图片方法类 * @param validatesessionkey session名称 * @throws exception */ public static void validatecode(httpservletrequest request, httpservletresponse response, defaultkaptcha captchaproducer, string validatesessionkey) throws exception{ // set to expire far in the past. response.setdateheader("expires", 0); // set standard http/1.1 no-cache headers. response.setheader("cache-control", "no-store, no-cache, must-revalidate"); // set ie extended http/1.1 no-cache headers (use addheader). response.addheader("cache-control", "post-check=0, pre-check=0"); // set standard http/1.0 no-cache header. response.setheader("pragma", "no-cache"); // return a jpeg response.setcontenttype("image/jpeg"); // create the text for the image string captext = captchaproducer.createtext(); // store the text in the session request.getsession().setattribute(validatesessionkey, captext); // create the image with the text bufferedimage bi = captchaproducer.createimage(captext); servletoutputstream out = response.getoutputstream(); // write the data out imageio.write(bi, "jpg", out); try { out.flush(); } finally { out.close(); } } }
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