1.环境准备

出现报错
Vue 引入路径正确的，但一直报错： Already included file name ‘××ב differs from file name ‘××ב only in casing.

解决方案来自此链接

2.注册界面的搭建

代码如下

<script setup>
import { User, Lock } from '@element-plus/icons-vue'
import { ref } from 'vue'
//控制注册与登录表单的显示， 默认显示注册
const isRegister = ref(false)//定义数据模型
const registerData=ref({username:'',password:'',rePassword:''
})
//校验密码的函数
const checkRePassword=(rule,value,callback)=>{if (value === '') {callback(new Error('请再次输入密码'));} else if (value !== registerData.value.password) {callback(new Error('两次输入密码不一致!'));} else {callback();}
}//定义表单检验规则
const rules=({username:[//用户名是必须的，如果出错提示信息为  请输入用户名 ，校验在该表单项失去焦点之后{required:true,message:'请输入用户名',trigger:'blur'},//5-16位的非空字符{min:5,max:16,message:'长度为5-16位的非空字符',trigger:'blur'},],password:[{required:true,message:'请输入密码',trigger:'blur'},{min:5,max:16,message:'长度为5-16位的非空字符',trigger:'blur'},],rePassword:[{validator:checkRePassword,trigger:'blur'}]
})
</script><template><el-row class="login-page"><el-col :span="12" class="bg"></el-col><el-col :span="6" :offset="3" class="form"><!-- 注册表单 --><el-form ref="form" size="large" autocomplete="off" v-if="isRegister" :model="registerData" :rules="rules"><el-form-item><h1>注册</h1></el-form-item><el-form-item prop="username"><el-input :prefix-icon="User" placeholder="请输入用户名" v-model="registerData.username"></el-input></el-form-item><el-form-item prop="password"><el-input :prefix-icon="Lock" type="password" placeholder="请输入密码" v-model="registerData.password"></el-input></el-form-item><el-form-item prop="rePassword"><el-input :prefix-icon="Lock" type="password" placeholder="请输入再次密码" v-model="registerData.rePassword"></el-input></el-form-item><!-- 注册按钮 --><el-form-item><el-button class="button" type="primary" auto-insert-space>注册</el-button></el-form-item><el-form-item class="flex"><el-link type="info" :underline="false" @click="isRegister = false">← 返回</el-link></el-form-item></el-form><!-- 登录表单 --><el-form ref="form" size="large" autocomplete="off" v-else><el-form-item><h1>登录</h1></el-form-item><el-form-item><el-input :prefix-icon="User" placeholder="请输入用户名"></el-input></el-form-item><el-form-item><el-input name="password" :prefix-icon="Lock" type="password" placeholder="请输入密码"></el-input></el-form-item><el-form-item class="flex"><div class="flex"><el-checkbox>记住我</el-checkbox><el-link type="primary" :underline="false">忘记密码？</el-link></div></el-form-item><!-- 登录按钮 --><el-form-item><el-button class="button" type="primary" auto-insert-space>登录</el-button></el-form-item><el-form-item class="flex"><el-link type="info" :underline="false" @click="isRegister = true">注册 →</el-link></el-form-item></el-form></el-col></el-row>
</template><style lang="scss" scoped>
/* 样式 */
.login-page {height: 100vh;background-color: #fff;.bg {background: url('@/assets/logo2.png') no-repeat 60% center / 240px auto,url('@/assets/login_bg.jpg') no-repeat center / cover;border-radius: 0 20px 20px 0;}.form {display: flex;flex-direction: column;justify-content: center;user-select: none;.title {margin: 0 auto;}.button {width: 100%;}.flex {width: 100%;display: flex;justify-content: space-between;}}
}
</style>

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3.注册接口的调用

接口文档

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user.js

import request from '@/utils/request.js'//提供调用注册接的函数
export const userRegisterService =(registerData)=>{//借助UrlSearchParams完成传递//直接传递参数为json,和手册不符合const params=new URLSearchParams()for(let key in registerData){params.append(key,registerData[key]);}return  request.post('/user/register',params);
}

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login.vue

//调用后台接口，完成注册
import {userRegisterService}from '@/api/user.js';
const register = async() => {//registerData是一个响应式数据，如果要获取值，需要.valuelet result= await userRegisterService(registerData.value);if(result.code==0){alert(result.msg ? result.msg : '注册成功')}else{alert('注册失败')}}

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  <el-form-item><el-button class="button" type="primary" auto-insert-space @click="register">注册</el-button></el-form-item>

3.跨域问题的解决

Access to XMLHttpRequest at ‘http://localhost:8080/user/register’ from origin ‘http://localhost:5173’ has been blocked by CORS policy: Response to preflight request doesn’t pass access control check: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

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问题1；Cannot invoke “String.getBytes()” because “s” is null

   /*** 生成字符串的md5校验值** @param s* @return*/public static String getMD5String(String s) {if (s != null) {byte[] bytes = s.getBytes();// 其余代码return getMD5String(s.getBytes());} else {// 处理s为null的情况return "MD5出现报错";}}

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问题2:没把参数传递到后端

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代码如下

import { fileURLToPath, URL } from 'node:url'import { defineConfig } from 'vite'
import vue from '@vitejs/plugin-vue'// https://vitejs.dev/config/
export default defineConfig({plugins: [vue(),],resolve: {alias: {'@': fileURLToPath(new URL('./src', import.meta.url))}},server:{proxy:{'/api':{//获取路径中包含了/api的请求target:'http://localhost:8080',//后台服务所在的源changeOrigin:true,//修改源rewrite:(path)=>path.replace(/^\/api/,'')//api替换为空字符串}}}
})

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