1、easy-captcha简介
easy-captcha是生成图形验证码的Java类库，支持gif、中文、算术等类型，可用于Java Web、JavaSE等项目。参考地址：[https://github.com/whvcse/EasyCaptcha]
2、添加依赖
<guava.version>20.0</guava.version> <captcha.version>1.6.2</captcha.version> <dependency> <groupId>com.google.guava</groupId> <artifactId>guava</artifactId> <version>${guava.version}</version> </dependency> <dependency> <groupId>com.github.whvcse</groupId> <artifactId>easy-captcha</artifactId> <version>${captcha.version}</version> </dependency>
3、编写service层代码
@Service public class CaptchaServiceImpl implements CaptchaService { /** * Local Cache 5分钟过期 */ Cache<String, String> localCache = CacheBuilder.newBuilder().maximumSize(1000).expireAfterAccess(5, TimeUnit.MINUTES).build(); @Override public void create(HttpServletResponse response, String uuid) throws IOException { response.setContentType("image/gif"); response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); //生成验证码 SpecCaptcha captcha = new SpecCaptcha(150, 40); captcha.setLen(5); captcha.setCharType(Captcha.TYPE_DEFAULT); captcha.out(response.getOutputStream()); //保存到缓存 setCache(uuid, captcha.text()); } @Override public boolean validate(String uuid, String code) { //获取验证码 String captcha = getCache(uuid); //效验成功 if(code.equalsIgnoreCase(captcha)){ return true; } return false; } private void setCache(String key, String value){ localCache.put(key, value); } private String getCache(String key){ String captcha = localCache.getIfPresent(key); //删除验证码 if(captcha != null){ localCache.invalidate(key); } return captcha; } }
4、开发验证码接口
创建LoginController并提供生成验证码的方法
@Controller @AllArgsConstructor public class CaptchaController { private CaptchaService captchaService; @GetMapping("/captcha") public void captcha(HttpServletResponse response, String uuid)throws IOException { //uuid不能为空 AssertUtils.isBlank(uuid, ErrorCode.IDENTIFIER_NOT_NULL); //生成验证码 captchaService.create(response, uuid); } }
5、前端vue增加如何代码显示生成的验证码
<Motion :delay="200"> <el-form-item prop="verifyCode"> <el-input clearable v-model="ruleForm.verifyCode" placeholder="验证码" :prefix-icon="useRenderIcon(Line)" > <template v-slot:append> <img style=" vertical-align: middle; height: 40px; width: 100px; cursor: pointer; " :src="captchaUrl" @click="onRefreshCode" alt="" /> </template> </el-input> </el-form-item> </Motion>
完整的登录页代码如下
<script setup lang="ts"> import Motion from "./utils/motion"; import { useRouter } from "vue-router"; import { message } from "@/utils/message"; import { loginRules } from "./utils/rule"; import { useNav } from "@/layout/hooks/useNav"; import type { FormInstance } from "element-plus"; import { useLayout } from "@/layout/hooks/useLayout"; import { useUserStoreHook } from "@/store/modules/user"; import { bg, avatar, illustration } from "./utils/static"; import { useRenderIcon } from "@/components/ReIcon/src/hooks"; import { ref, reactive, toRaw, onMounted, onBeforeUnmount } from "vue"; import { useDataThemeChange } from "@/layout/hooks/useDataThemeChange"; import { initRouter } from "@/router/utils"; import { getUuid } from "@/utils/utils"; import dayIcon from "@/assets/svg/day.svg?component"; import darkIcon from "@/assets/svg/dark.svg?component"; import Lock from "@iconify-icons/ri/lock-fill"; import User from "@iconify-icons/ri/user-3-fill"; import Line from "@iconify-icons/ri/shield-keyhole-line"; import { getConfig } from "@/config"; defineOptions({ name: "Login" }); const router = useRouter(); const loading = ref(false); const ruleFormRef = ref<FormInstance>(); const captchaUrl = ref(""); const { Api } = getConfig(); const { initStorage } = useLayout(); initStorage(); const { dataTheme, dataThemeChange } = useDataThemeChange(); dataThemeChange(); const { title } = useNav(); const ruleForm = reactive({ username: "admin", password: "admin123", verifyCode: "", uuid: "" }); const onLogin = async (formEl: FormInstance | undefined) => { loading.value = true; if (!formEl) return; await formEl.validate((valid, fields) => { if (valid) { useUserStoreHook() .loginByUsername({ username: ruleForm.username, password: "admin123" }) .then(res => { if (res.code == 200) { // 获取后端路由 initRouter().then(() => { router.push("/"); message("登录成功", { type: "success" }); }); } }); } else { loading.value = false; return fields; } }); }; /** 使用公共函数，避免`removeEventListener`失效 */ function onkeypress({ code }: KeyboardEvent) { if (code === "Enter") { onLogin(ruleFormRef.value); } } function getCaptchaUrl() { ruleForm.uuid = getUuid(); captchaUrl.value = `${Api}/captcha?uuid=${ruleForm.uuid}`; } function onRefreshCode() { getCaptchaUrl(); } onMounted(() => { window.document.addEventListener("keypress", onkeypress); getCaptchaUrl(); }); onBeforeUnmount(() => { window.document.removeEventListener("keypress", onkeypress); }); </script> <template> <div class="select-none"> <img :src="bg" class="wave" /> <div class="flex-c absolute right-5 top-3"> <!-- 主题 --> <el-switch v-model="dataTheme" inline-prompt :active-icon="dayIcon" :inactive-icon="darkIcon" @change="dataThemeChange" /> </div> <div class="login-container"> <div class="img"> <component :is="toRaw(illustration)" /> </div> <div class="login-box"> <div class="login-form"> <avatar class="avatar" /> <Motion> <h2 class="outline-none">{{ title }}</h2> </Motion> <el-form ref="ruleFormRef" :model="ruleForm" :rules="loginRules" size="large" > <Motion :delay="100"> <el-form-item :rules="[ { required: true, message: '请输入账号', trigger: 'blur' } ]" prop="username" > <el-input clearable v-model="ruleForm.username" placeholder="账号" :prefix-icon="useRenderIcon(User)" /> </el-form-item> </Motion> <Motion :delay="150"> <el-form-item prop="password"> <el-input clearable show-password v-model="ruleForm.password" placeholder="密码" :prefix-icon="useRenderIcon(Lock)" /> </el-form-item> </Motion> <Motion :delay="200"> <el-form-item prop="verifyCode"> <el-input clearable v-model="ruleForm.verifyCode" placeholder="验证码" :prefix-icon="useRenderIcon(Line)" > <template v-slot:append> <img style=" vertical-align: middle; height: 40px; width: 100px; cursor: pointer; " :src="captchaUrl" @click="onRefreshCode" alt="" /> </template> </el-input> </el-form-item> </Motion> <Motion :delay="250"> <el-button class="w-full mt-4" size="default" type="primary" :loading="loading" @click="onLogin(ruleFormRef)" > 登录 </el-button> </Motion> </el-form> </div> </div> </div> </div> </template> <style scoped> @import url("@/style/login.css"); </style> <style lang="scss" scoped> :deep(.el-input-group__append, .el-input-group__prepend) { padding: 0; } </style>
编译运行后端，同事运行点前端，可以看到登录页面。
