本文介绍了springboot结合springsecurity实现图形验证码功能,分享给大家,具体如下:
生成图形验证码
- 根据随机数生成图片
- 将随机数存到session中
- 将生成的图片写到接口的响应中
生成图形验证码的过程比较简单,和springsecurity也没有什么关系。所以就直接贴出代码了
根据随机数生成图片
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/** * 生成图形验证码 * @param request * @return */ private imagecode generate(servletwebrequest request) { int width = 64 ; int height = 32 ; bufferedimage image = new bufferedimage(width, height, bufferedimage.type_int_rgb); graphics g = image.getgraphics(); random random = new random(); g.setcolor(getrandcolor( 200 , 250 )); g.fillrect( 0 , 0 , width, height); g.setfont( new font( "times new roman" , font.italic, 20 )); g.setcolor(getrandcolor( 160 , 200 )); for ( int i = 0 ; i < 155 ; i++) { int x = random.nextint(width); int y = random.nextint(height); int xl = random.nextint( 12 ); int yl = random.nextint( 12 ); g.drawline(x, y, x + xl, y + yl); } string srand = "" ; for ( int i = 0 ; i < 4 ; i++) { string rand = string.valueof(random.nextint( 10 )); srand += rand; g.setcolor( new color( 20 + random.nextint( 110 ), 20 + random.nextint( 110 ), 20 + random.nextint( 110 ))); g.drawstring(rand, 13 * i + 6 , 16 ); } g.dispose(); return new imagecode(image, srand, 60 ); } /** * 生成随机背景条纹 * * @param fc * @param bc * @return */ private color getrandcolor( int fc, int bc) { random random = new random(); if (fc > 255 ) { fc = 255 ; } if (bc > 255 ) { bc = 255 ; } int r = fc + random.nextint(bc - fc); int g = fc + random.nextint(bc - fc); int b = fc + random.nextint(bc - fc); return new color(r, g, b); } |
将随机数存到session中 && 将生成的图片写到接口的响应中
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@restcontroller public class validatecodecontroller { public static final string session_key = "session_key_image_code" ; private sessionstrategy sessionstrategy = new httpsessionsessionstrategy(); @getmapping ( "/code/image" ) public void createcode(httpservletrequest request, httpservletresponse response) throws ioexception { imagecode imagecode = generate( new servletwebrequest(request)); sessionstrategy.setattribute( new servletwebrequest(request), session_key, imagecode); imageio.write(imagecode.getimage(), "jpeg" , response.getoutputstream()); } } |
在认证流程中加入图形验证码
在springsecurity认证流程详解中,我们有讲到,springsecurity是通过过滤器链来进行校验的,我们想要验证图形验证码,所以可以在认证流程之前,也就是usernamepasswordauthenticationfilter
之前进行校验。
自定义图形验证码的过滤器
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@component public class validatecodefilter extends onceperrequestfilter { private sessionstrategy sessionstrategy = new httpsessionsessionstrategy(); private authenticationfailurehandler authenticationfailurehandler; @override protected void dofilterinternal(httpservletrequest httpservletrequest, httpservletresponse httpservletresponse, filterchain filterchain) throws servletexception, ioexception { if (stringutils.equals( "/user/login" , httpservletrequest.getrequesturi()) && stringutils.equalsignorecase(httpservletrequest.getmethod(), "post" )) { try { // 1. 进行验证码的校验 validate( new servletwebrequest(httpservletrequest)); } catch (validatecodeexception e) { // 2. 如果校验不通过,调用springsecurity的校验失败处理器 authenticationfailurehandler.onauthenticationfailure(httpservletrequest, httpservletresponse, e); return ; } } // 3. 校验通过,就放行 filterchain.dofilter(httpservletrequest, httpservletresponse); } } |
这里验证码校验的过程比较简单,主要就是判断传过来的参数和session中保存的是否一致,以及session中的验证码是否过期了。
有了自己的验证码过滤器之后,我们还需要将它配置在usernamepasswordauthenticationfilter之前:
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@override protected void configure(httpsecurity http) throws exception { validatecodefilter validatecodefilter = new validatecodefilter(); validatecodefilter.setauthenticationfailurehandler(myauthenticationfailurehandler); // 将我们自定义的过滤器,配置到usernamepasswordauthenticationfilter之前 http.addfilterbefore(validatecodefilter, usernamepasswordauthenticationfilter. class ) .formlogin() // 定义当需要用户登录时候,转到的登录页面。 // 后面的配置省略 } |
代码下载
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/u013435893/article/details/79617872