记录第一次SpringBoot开发的失败经历
一个小功能的失败的开发经历
一、开发前的想法
刚开始的时候，乌蒙地插传分的时候每次都要一步步输入Bot的指令，我就想了以下，刚好最近几天入门了Java，想着搞个神秘的玩意儿，来自己构造一个简单的controller来自动生成Bot指令。
以下是我的开发失败经过
二、前端和前端渲染问题
因为有过一些 Python 的 Flask 框架的基础，所以我知道一个东西叫模板渲染，这个可以保证后端代码的简洁，所以找ai生成了如下代码：
index.html
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| <!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org" lang="zh-CN">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
<title>音游传分工具 | 支持歌曲名/版本</title>
<link rel="stylesheet" th:href="@{/css/style.css}">
</head>
<body>
<div class="card">
<div class="header">
<h1>
🎵 舞萌·传分器
<span>扩展版</span>
</h1>
<p>选择「传分」填写成绩 → 提交后端 → 获取指令</p>
</div>
<div class="mode-section">
<div class="mode-label">
<span>📌 模式选择：</span>
<select id="modeSelect">
<option value="transmit">✨ 传分</option>
<option value="buried">🕳️ 下埋</option>
</select>
<span class="badge-hint" style="background:#eef2ff;">传分包含9项参数</span>
</div>
</div>
<div id="scoreFormContainer" class="form-container">
<div class="form-grid">
<div class="input-group">
<label>🎼 乐曲ID <span class="badge-hint">可选，空则传None</span></label>
<input type="text" id="musicId" placeholder="例: 11624 (可不填)" autocomplete="off">
</div>
<div class="input-group">
<label>📝 歌曲名字 <span class="badge-hint">可选，空则传None</span></label>
<input type="text" id="songName" placeholder="例: 夜に駆ける (可不填)" autocomplete="off">
</div>
<div class="input-group">
<label>🎚️ 歌曲版本</label>
<select id="songVersion">
<option value="标准谱">标准谱</option>
<option value="DX谱">DX谱</option>
</select>
</div>
<div class="input-group">
<label>📊 等级 <span class="badge-hint">0绿 1黄 2红 3紫 4白</span></label>
<select id="levelSelect">
<option value="0">0 - 🟢 绿谱 (BASIC)</option>
<option value="1">1 - 🟡 黄谱 (ADVANCED)</option>
<option value="2">2 - 🔴 红谱 (EXPERT)</option>
<option value="3">3 - 🟣 紫谱 (MASTER)</option>
<option value="4">4 - ⚪ 白谱 (RE:MASTER)</option>
</select>
<div class="small-note">※ 0→绿 / 1→黄 / 2→红 / 3→紫 / 4→白</div>
</div>
<div class="input-group">
<label>🔄 游玩次数</label>
<input type="number" id="playCount" placeholder="例: 3" min="0" step="1" value="1">
</div>
<div class="input-group">
<label>🏆 成绩分数</label>
<input type="number" id="score" placeholder="例: 1010000" value="1010000" step="1">
<div class="small-note">理论值 1010000</div>
</div>
<div class="input-group">
<label>⚡ 连击数 (Combo)</label>
<input type="number" id="combo" placeholder="最大连击" min="0" value="1250" step="1">
</div>
<div class="input-group">
<label>🎯 同步分数 <span class="badge-hint">0无 → 5sync</span></label>
<select id="syncSelect">
<option value="0">0 - 无 (None)</option>
<option value="1">1 - fs</option>
<option value="2">2 - fs+</option>
<option value="3">3 - fdx</option>
<option value="4">4 - fdx+</option>
<option value="5">5 - sync</option>
</select>
<div class="small-note">0:无 / 1:fs / 2:fs+ / 3:fdx / 4:fdx+ / 5:sync</div>
</div>
<div class="input-group">
<label>✨ DX分</label>
<input type="number" id="dxScore" placeholder="DX 达成率分数" value="2845" step="any">
<div class="small-note">例如 2870</div>
</div>
</div>
</div>
<div class="action-area">
<button class="submit-btn" id="submitDataBtn">📡 提交并生成指令</button>
</div>
<div class="result-area">
<div class="result-header">📟 后端返回指令</div>
<pre id="resultOutput" class="result-content">等待提交...</pre>
</div>
</div>
<div id="toastMessage" class="toast-msg"></div>
<script th:src="@{/js/script.js}" defer></script>
</body>
</html>
|
style.css
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| * {
margin: 0;
padding: 0;
box-sizing: border-box;
font-family: system-ui, 'Segoe UI', 'Poppins', 'Noto Sans', sans-serif;
}
body {
background: linear-gradient(145deg, #f0f4fa 0%, #d9e2ef 100%);
min-height: 100vh;
display: flex;
justify-content: center;
align-items: center;
padding: 2rem 1.5rem;
}
.card {
max-width: 960px;
width: 100%;
background: rgba(255, 255, 255, 0.96);
backdrop-filter: blur(2px);
border-radius: 2rem;
box-shadow: 0 20px 35px -12px rgba(0, 0, 0, 0.2), 0 1px 3px rgba(0, 0, 0, 0.05);
overflow: hidden;
transition: all 0.2s ease;
}
.header {
background: #1a2c3e;
padding: 1.5rem 2rem;
color: white;
}
.header h1 {
font-size: 1.8rem;
font-weight: 600;
letter-spacing: -0.3px;
display: flex;
align-items: center;
gap: 0.5rem;
}
.header h1 span {
background: #ffb347;
font-size: 0.85rem;
padding: 0.2rem 0.7rem;
border-radius: 40px;
color: #1a2c3e;
font-weight: 500;
}
.header p {
font-size: 0.85rem;
opacity: 0.8;
margin-top: 0.5rem;
}
.mode-section {
padding: 1.8rem 2rem 0.8rem 2rem;
border-bottom: 1px solid #e9edf2;
background: #ffffff;
}
.mode-label {
display: flex;
align-items: center;
gap: 1rem;
flex-wrap: wrap;
font-weight: 600;
color: #1e2f3f;
}
.mode-label span {
font-size: 1rem;
}
select {
background-color: #f8fafc;
border: 1px solid #cbd5e1;
border-radius: 60px;
padding: 0.6rem 1.8rem 0.6rem 1.2rem;
font-size: 1rem;
font-weight: 500;
color: #0f172a;
cursor: pointer;
transition: all 0.2s;
appearance: none;
background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23334155' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'><polyline points='6 9 12 15 18 9'></polyline></svg>");
background-repeat: no-repeat;
background-position: right 1rem center;
background-size: 1rem;
}
select:focus {
outline: none;
border-color: #ff8c42;
box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.2);
}
.form-container {
padding: 1.8rem 2rem 2rem 2rem;
transition: all 0.2s ease;
}
.form-grid {
display: grid;
grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
gap: 1.5rem 2rem;
}
.input-group {
display: flex;
flex-direction: column;
gap: 0.5rem;
}
.input-group label {
font-weight: 600;
font-size: 0.9rem;
color: #1e2f3f;
display: flex;
align-items: center;
flex-wrap: wrap;
gap: 0.5rem;
}
.badge-hint {
background: #eef2ff;
font-size: 0.7rem;
font-weight: normal;
padding: 0.2rem 0.6rem;
border-radius: 30px;
color: #2c3e66;
letter-spacing: 0.3px;
}
input,
select {
background: #ffffff;
border: 1px solid #cfdee9;
border-radius: 1rem;
padding: 0.7rem 1rem;
font-size: 0.95rem;
transition: all 0.2s;
color: #0a1c2a;
}
input:focus,
select:focus {
outline: none;
border-color: #ff8c42;
box-shadow: 0 0 0 3px rgba(255, 140, 66, 0.15);
}
input::placeholder {
color: #9aaebf;
font-weight: 400;
font-size: 0.85rem;
}
.action-area {
padding: 0rem 2rem 1rem 2rem;
display: flex;
justify-content: flex-end;
border-top: 1px solid #eef2f8;
margin-top: 0.2rem;
}
.submit-btn {
background: #1e2f3f;
border: none;
padding: 0.75rem 1.8rem;
border-radius: 2rem;
font-weight: 600;
font-size: 0.9rem;
color: white;
cursor: pointer;
transition: all 0.2s;
display: inline-flex;
align-items: center;
gap: 0.5rem;
box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05);
}
.submit-btn:hover {
background: #ff8c42;
transform: translateY(-2px);
box-shadow: 0 8px 18px rgba(255, 140, 66, 0.25);
}
.result-area {
margin: 0 2rem 2rem 2rem;
background: #f8fafc;
border-radius: 1.2rem;
border: 1px solid #e2e8f0;
overflow: hidden;
}
.result-header {
background: #eef2ff;
padding: 0.7rem 1.2rem;
font-weight: 600;
color: #1e2f3f;
border-bottom: 1px solid #e2e8f0;
font-size: 0.85rem;
}
.result-content {
background: #ffffff;
padding: 1rem 1.2rem;
font-family: 'SF Mono', 'Fira Code', monospace;
font-size: 0.9rem;
white-space: pre-wrap;
word-wrap: break-word;
color: #0f172a;
min-height: 100px;
max-height: 200px;
overflow-y: auto;
margin: 0;
}
.toast-msg {
position: fixed;
bottom: 25px;
left: 50%;
transform: translateX(-50%) scale(0.9);
background: #1e293b;
color: #f1f5f9;
padding: 0.7rem 1.6rem;
border-radius: 60px;
font-size: 0.85rem;
font-weight: 500;
box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
opacity: 0;
transition: opacity 0.2s, transform 0.2s;
pointer-events: none;
z-index: 1000;
backdrop-filter: blur(4px);
white-space: nowrap;
}
.toast-msg.show {
opacity: 1;
transform: translateX(-50%) scale(1);
}
.hidden-form {
display: none;
}
.small-note {
font-size: 0.7rem;
color: #6c86a3;
margin-top: 0.2rem;
}
@media (max-width: 680px) {
.card {
border-radius: 1.5rem;
}
.form-container {
padding: 1.5rem;
}
.mode-section,
.action-area,
.result-area {
padding-left: 1.5rem;
padding-right: 1.5rem;
margin-left: 0;
margin-right: 0;
}
.form-grid {
grid-template-columns: 1fr;
gap: 1.2rem;
}
.toast-msg {
white-space: normal;
text-align: center;
max-width: 85%;
font-size: 0.75rem;
padding: 0.6rem 1.2rem;
}
}
|
script.js
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| (function () {
const modeSelect = document.getElementById('modeSelect');
const formContainer = document.getElementById('scoreFormContainer');
const submitBtn = document.getElementById('submitDataBtn');
const toastEl = document.getElementById('toastMessage');
const resultOutput = document.getElementById('resultOutput');
const API_URL = '/api/score/submit';
function showMessage(msg, isError = false) {
toastEl.textContent = msg;
toastEl.classList.add('show');
if (isError) {
toastEl.style.backgroundColor = '#b91c1c';
toastEl.style.color = '#fff5f0';
} else {
toastEl.style.backgroundColor = '#1e293b';
toastEl.style.color = '#f1f5f9';
}
setTimeout(() => {
toastEl.classList.remove('show');
setTimeout(() => {
toastEl.style.backgroundColor = '#1e293b';
toastEl.style.color = '#f1f5f9';
}, 200);
}, 2500);
}
function toggleFormByMode(mode) {
if (mode === 'transmit') {
formContainer.classList.remove('hidden-form');
formContainer.style.display = '';
} else if (mode === 'buried') {
formContainer.classList.add('hidden-form');
formContainer.style.display = 'none';
}
}
function initMode() {
const currentMode = modeSelect.value;
if (currentMode === 'buried') {
formContainer.classList.add('hidden-form');
formContainer.style.display = 'none';
} else {
formContainer.classList.remove('hidden-form');
formContainer.style.display = '';
}
}
modeSelect.addEventListener('change', (e) => {
toggleFormByMode(e.target.value);
resultOutput.textContent = '等待提交...';
});
function collectTransmitData() {
const mode = modeSelect.value;
if (mode !== 'transmit') {
return { success: false, reason: '当前为「下埋」模式，无传分数据。' };
}
if (formContainer.classList.contains('hidden-form') || getComputedStyle(formContainer).display === 'none') {
return { success: false, reason: '传分表单未激活，请重新选择「传分」模式' };
}
let musicId = document.getElementById('musicId').value.trim();
if (musicId === "") musicId = "None";
let songName = document.getElementById('songName').value.trim();
if (songName === "") songName = "None";
const songVersion = document.getElementById('songVersion').value;
const level = parseInt(document.getElementById('levelSelect').value, 10);
const playCount = parseInt(document.getElementById('playCount').value, 10);
if (isNaN(playCount) || playCount < 0) {
return { success: false, reason: '游玩次数必须是有效数字且≥0' };
}
const score = parseInt(document.getElementById('score').value, 10);
if (isNaN(score) || score < 0) {
return { success: false, reason: '成绩分数必须是有效整数' };
}
const combo = parseInt(document.getElementById('combo').value, 10);
if (isNaN(combo) || combo < 0) {
return { success: false, reason: '连击数必须是非负整数' };
}
const sync = parseInt(document.getElementById('syncSelect').value, 10);
const dxScoreRaw = document.getElementById('dxScore').value;
let dxScore = dxScoreRaw.trim() === "" ? null : parseFloat(dxScoreRaw);
if (dxScoreRaw.trim() !== "" && isNaN(dxScore)) {
return { success: false, reason: 'DX分格式错误，请输入数字' };
}
return {
success: true,
data: {
musicId: musicId,
songName: songName,
songVersion: songVersion,
level: level,
playCount: playCount,
score: score,
combo: combo,
sync: sync,
dxScore: dxScore
}
};
}
async function sendToBackend(payload) {
try {
const response = await fetch(API_URL, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Accept': 'application/json'
},
body: JSON.stringify(payload)
});
if (!response.ok) {
const errorText = await response.text();
throw new Error(`HTTP ${response.status}: ${errorText}`);
}
const contentType = response.headers.get('content-type');
if (contentType && contentType.includes('application/json')) {
const jsonResult = await response.json();
return { success: true, data: jsonResult };
} else {
const textResult = await response.text();
return { success: true, data: textResult };
}
} catch (error) {
console.error('POST 请求失败:', error);
return { success: false, error: error.message };
}
}
function renderCommandFromBackend(responseData) {
if (typeof responseData === 'string') {
resultOutput.textContent = responseData;
return;
}
if (responseData && typeof responseData === 'object') {
if (responseData.command && typeof responseData.command === 'string') {
resultOutput.textContent = responseData.command;
return;
}
resultOutput.textContent = JSON.stringify(responseData, null, 2);
return;
}
resultOutput.textContent = String(responseData);
}
async function handleSubmit() {
const currentMode = modeSelect.value;
if (currentMode === 'buried') {
showMessage('🕳️ 下埋模式：未发送请求，可自行扩展', false);
resultOutput.textContent = '下埋模式，无后端请求。';
return;
}
const collectResult = collectTransmitData();
if (!collectResult.success) {
showMessage(`❌ ${collectResult.reason}`, true);
return;
}
const payload = collectResult.data;
resultOutput.textContent = '⏳ 正在向后端请求指令...';
const response = await sendToBackend(payload);
if (response.success) {
showMessage('✅ 后端处理成功，指令已显示', false);
renderCommandFromBackend(response.data);
} else {
showMessage(`❌ 请求失败: ${response.error}`, true);
resultOutput.textContent = `错误：${response.error}\n请检查后端接口是否可用。`;
}
}
submitBtn.addEventListener('click', handleSubmit);
initMode();
})();
|
模板渲染则是使用 thymeleaf 框架，maven 的pom.xml中加入这个就可以了：
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| <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
|
前置就解决了。
三、小知识点
在写这个的时候，我发现，导入了thymeleaf之后，创建一个controller的java文件之后，如果采用@Controller这个注解的话，直接return "index;"的时候，就算是把index.html给返回了，如果是@RestController的话，之后返回index这一个字符串给浏览器。
这个控制器的后端代码比较简单：
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| package com.g01den.demo01.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
@Controller
public class divingFishController {
@GetMapping("/divingFish")
public String divingFishGet() {
return "index";
}
}
|
四、关于歌曲别名的api和相关解析的代码
之后就是api了，看前端js代码可以知道，那里通过js请求了后端中中构造command的api，然后获得返回值之后渲染到输出框里。
那么关于这里，找可以通过歌曲别名搜索歌曲信息的api就是难点，本来我确实找到了一个，就是这个https://oss.lista233.cn/alias.json，本来确实开发完成了，代码如下：
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| package com.g01den.demo01.controller;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.util.Map;
@RestController
@RequestMapping("/api/score")
public class divingFishApiDemo {
public String aliaGetID(String alias, String version) throws IOException, JSONException {
String id = "";
int tmp = -1;
String aliasUrl = "https://oss.lista233.cn/alias.json";
HttpURLConnection conn = null;
BufferedReader reader = null;
StringBuilder response = new StringBuilder();
try {
URL url = new URL(aliasUrl);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(15000);
conn.setReadTimeout(15000);
conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36");
conn.setRequestProperty("Accept", "application/json, text/plain, */*");
conn.setRequestProperty("Connection", "keep-alive");
try (InputStreamReader isr = new InputStreamReader(conn.getInputStream(), StandardCharsets.UTF_8);
BufferedReader br = new BufferedReader(isr)) {
String line;
while ((line = br.readLine()) != null) {
response.append(line);
}
}
JSONObject jsonResponse = new JSONObject(response.toString()) ;
if (!jsonResponse.has("content")) {
throw new JSONException("JSON数据格式错误：缺少 content 字段");
}
JSONArray aliasData = jsonResponse.getJSONArray("content");
for (int i = 0; i < aliasData.length(); i++) {
JSONObject item = aliasData.getJSONObject(i);
if (!item.has("SongID") || !item.has("Alias")) {
continue;
}
String songId = item.getString("SongID");
JSONArray aliases = item.getJSONArray("Alias");
for (int j = 0; j < aliases.length(); j++) {
if (alias.equals(aliases.getString(j))) {
try {
tmp = Integer.parseInt(songId);
} catch (NumberFormatException e) {
continue;
}
if (version.equals("DX谱")) {
if (tmp >= 10000) {
id = songId;
}
} else if (version.equals("标准谱")) {
if (tmp < 10000) {
id = songId;
}
}
}
}
}
} finally {
if (conn != null) {
conn.disconnect();
}
}
return id;
}
@PostMapping("/submit")
public String submitScore(@RequestBody Map<String, Object> payload) throws JSONException, IOException {
String musicId = payload.getOrDefault("musicId", "0").toString();
String songName = payload.getOrDefault("songName", "").toString();
String songVersion = payload.getOrDefault("songVersion", "").toString();
int level = ((Number) payload.getOrDefault("level", 0)).intValue();
int playCount = ((Number) payload.getOrDefault("playCount", 0)).intValue();
int score = ((Number) payload.getOrDefault("score", 0)).intValue();
int combo = ((Number) payload.getOrDefault("combo", 0)).intValue();
int sync = ((Number) payload.getOrDefault("sync", 0)).intValue();
Object dxScoreObj = payload.get("dxScore");
String dxScore = (dxScoreObj == null) ? "0" : dxScoreObj.toString();
if (musicId.equals("None") && !songName.equals("None")) {
musicId = aliaGetID(songName, songVersion);
if (musicId == null || musicId.isEmpty()) {
return "{\"command\": \"未找到对应歌曲，请检查别名或版本\"}";
}
} else if (musicId.equals("None") && songName.equals("None")) {
return "{\"command\": \"ID和别名不能为空\"}";
}
String command = String.format("传分 %s %d %d %d %d %d %s",
musicId, level, playCount, score, combo, sync, dxScore);
return "{\"command\": \"" + command + "\"}";
}
}
|
五、部署到Windows服务器上：
通过maven打包了jar包之后，写三个bat文件：
start.bat
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| @echo off
set APP_NAME=demo01-0.0.1-SNAPSHOT
set LOG_FILE=app.log
echo Starting %APP_NAME%...
REM 后台运行应用，并将控制台输出重定向到日志文件
start /b javaw -jar %APP_NAME%.jar > %LOG_FILE% 2>&1
echo Application started. Check %LOG_FILE% for details.
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stop.bat
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| @echo off
echo Stopping Java applications...
REM 查找并终止所有 javaw.exe 进程
taskkill /f /im javaw.exe
echo All Java processes have been stopped.
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restart.bat
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| @echo off
call stop.bat
timeout /t 3 > nul
call start.bat
|
之后安装jdk之后运行对应bat代码即可。
六、部署之后服务器上DNS解析不了
本来感觉成功了，本地都跑起来了，并且正常运行了，结果上了香港那边的服务器之后发现DNS解析不了，这个不难解决，通过clash之类的搞一个大陆的代理即可。
七、第二天直接本地都无法访问api了
第二天，本来想安装个clash去换个代理的，结果就出现了，本地测试的时候突然别名的那个api无法使用了，直接无法访问了，这就很尴尬，本来就是第一个SpringBoot小功能，结果炸了，用不了了，我一直哭。
八、🐧我感觉我被世界针对了🐧（开始发癫）
我操了老铁，我感觉我被世界针对了，你搓码子好不容易搓出来，本地能跑起来，都部署到服务器了，结果上了服务器之后，因为不知道什么原因，DNS解析不上，布什戈门？我本地都能调用api，结果服务器因为DNS解析不上调用不了api。这我忍了，给程序上个proxy就好了，但是，最让人气愤的来了，第二天本来想着修这个bug的，结果本地用python和java写的测试程序都访问不了这个api了，但是浏览器能访问，本以为加上user-agent能解决，结果来来回回换了好几次都解决不了。我真求你了，每次写的程序本来能跑，上了远程就跑不了了，然后过不了多久，本地也跑不了了。老天爷，我不想活了，你下叼啊，操死我。
咕咕嘎嘎！！！
