Laravel8 使用图形验证码做登录功能的实现

//路由分组
Route::group(["prefix"=>"admin","namespace"=>"Admin"],function (){

    //登录显示 name给路由起一个别名
    Route::get("login","LoginController@index")->name("admin.login");

    //登录方法 name给路由起一个别名
    Route::post("login","LoginController@login")->name("admin.login");

    //定义图形验证码路由
    Route::get("img_code","CommonController@imgCode")->name("admin.img_code");
});

<?php

namespace AppHttpControllersAdmin;

use AppHttpControllersController;
use CarbonCarbon;
use GregwarCaptchaCaptchaBuilder;
use GregwarCaptchaPhraseBuilder;

class CommonController extends Controller
{
    //验证码
    public function imgCode()
    {
        $phrase = new PhraseBuilder;
        // 设置验证码位数
        $code = $phrase->build(4);
        // 生成验证码图片的Builder对象，配置相应属性
        $builder = new CaptchaBuilder($code, $phrase);
        // 设置背景颜色25,25,112
        $builder->setBackgroundColor(34, 0, 45);
        // 设置倾斜角度
        $builder->setMaxAngle(25);
        // 设置验证码后面最大行数
        $builder->setMaxBehindLines(10);
        // 设置验证码前面最大行数
        $builder->setMaxFrontLines(10);
        // 设置验证码颜色
        $builder->setTextColor(230, 81, 175);
        // 可以设置图片宽高及字体
        $builder->build($width = 150, $height = 40, $font = null);
        // 获取验证码的内容
        $phrase = $builder->getPhrase();

        // 把内容存入 cache，10分钟后过期
        $client_id = md5( rand(1,1000).time());
        Cache::put($client_id, $phrase, Carbon::now()->addMinutes(10));

        // 组装接口数据
        $data = [
            "client" => $client_id,
            "captcha" => $builder->inline(),
        ];
        return $data;
    }
}


![image.png](https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/8034e8b8f6ac4f0abe121f296591e3bd~tplv-k3u1fbpfcp-watermark.image)

<script>
    //页面加载完毕事件
    $(function(){
        getCaptCha();
    });

    //获取图形验证码的方法
    var getCaptCha = function (){
        $.ajax({
            url:"{{route("admin.img_code")}}",
            success(res){
                $("#client").val(res.client);
                $("#img_code").attr("src",res.captcha);
            }
        })
    }

</script>

 <input type="hidden" id="client" name="client" >

<div class="row cl">
                <div class="formControls col-xs-8 col-xs-offset-3">
                    <input name="captcha" class="input-text size-L" type="text" placeholder="验证码" onblur="if(this.value==""){this.value="验证码:"}" onclick="if(this.value=="验证码:"){this.value="";}" value="" style="width:150px;">
                    <img id="img_code" src="" onclick="getCaptCha()"> <a id="kanbuq" onclick="getCaptCha()" href="javascript:;" rel="external nofollow" >看不清，换一张</a> </div>
            </div>

 //登录方法
    public function login(Request $request)
    {
        //接收所有参数
        $params = $request->all();
        //取出验证码是否一致
        $captcha = Cache::get($params["client"]);
        if ($params["captcha"] != $captcha){
            return redirect(route("admin.login"))->withErrors(["error" => "验证码错误"]);
        }
    }