2026-03-07 05:43:15 +00:00
<!DOCTYPE html>
2026-03-18 16:43:04 +08:00
< html lang = "en" >
2026-03-07 05:43:15 +00:00
< head >
< meta charset = "UTF-8" >
< meta name = "viewport" content = "width=device-width, initial-scale=1.0" >
2026-03-19 13:53:49 +08:00
< title > Spring Boot Learning Cockpit< / title >
2026-03-07 05:43:15 +00:00
< style >
2026-03-18 16:43:04 +08:00
:root {
2026-03-19 13:53:49 +08:00
--bg: #eef5ff;
--panel: rgba(255, 255, 255, 0.94);
--line: #d8e4f0;
--text: #122033;
--muted: #5d7288;
--brand: #177245;
--accent: #0f67b5;
--warm: #f08c2b;
--shadow: 0 22px 54px rgba(18, 32, 51, 0.12);
2026-03-18 16:43:04 +08:00
}
* { box-sizing: border-box; }
body {
margin: 0;
color: var(--text);
2026-03-19 13:53:49 +08:00
font-family: "Aptos", "Segoe UI", "Microsoft YaHei", sans-serif;
background:
radial-gradient(circle at top left, rgba(23, 114, 69, 0.14), transparent 28%),
radial-gradient(circle at bottom right, rgba(15, 103, 181, 0.14), transparent 26%),
var(--bg);
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
a { color: inherit; text-decoration: none; }
button, input, select { font: inherit; }
.page { max-width: 1380px; margin: 0 auto; padding: 24px; }
.hero, .card {
background: var(--panel);
border: 1px solid var(--line);
2026-03-18 16:43:04 +08:00
border-radius: 28px;
box-shadow: var(--shadow);
2026-03-19 13:53:49 +08:00
backdrop-filter: blur(10px);
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
.hero { padding: 28px; margin-bottom: 18px; }
2026-03-18 16:43:04 +08:00
.eyebrow {
display: inline-flex;
2026-03-19 13:53:49 +08:00
padding: 7px 12px;
2026-03-18 16:43:04 +08:00
border-radius: 999px;
2026-03-19 13:53:49 +08:00
background: rgba(23, 114, 69, 0.1);
color: var(--brand);
2026-03-18 16:43:04 +08:00
font-size: 12px;
2026-03-19 13:53:49 +08:00
font-weight: 800;
letter-spacing: 0.1em;
2026-03-18 16:43:04 +08:00
text-transform: uppercase;
}
2026-03-19 13:53:49 +08:00
h1, h2, h3 { margin: 10px 0 12px; }
p { margin: 0; color: var(--muted); line-height: 1.8; }
.hero-grid, .workspace, .triple {
display: grid;
gap: 18px;
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
.hero-grid {
grid-template-columns: 1.3fr 0.9fr;
align-items: start;
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
.actions, .chip-list, .toolbar, .demo-links {
2026-03-18 16:43:04 +08:00
display: flex;
2026-03-19 13:53:49 +08:00
gap: 10px;
2026-03-18 16:43:04 +08:00
flex-wrap: wrap;
}
2026-03-19 13:53:49 +08:00
.btn, .btn-soft {
2026-03-18 16:43:04 +08:00
display: inline-flex;
align-items: center;
justify-content: center;
2026-03-19 13:53:49 +08:00
border: 0;
border-radius: 999px;
2026-03-18 16:43:04 +08:00
padding: 12px 18px;
2026-03-19 13:53:49 +08:00
cursor: pointer;
2026-03-18 16:43:04 +08:00
font-weight: 700;
}
2026-03-19 13:53:49 +08:00
.btn {
color: #fff;
background: linear-gradient(135deg, var(--brand), #35a465);
}
.btn-soft {
color: var(--accent);
background: #eaf3ff;
}
.card { padding: 22px; }
.stats {
2026-03-18 16:43:04 +08:00
display: grid;
2026-03-19 13:53:49 +08:00
grid-template-columns: repeat(4, minmax(0, 1fr));
gap: 12px;
margin-top: 18px;
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
.stat {
padding: 16px;
border-radius: 18px;
border: 1px solid var(--line);
background: rgba(255,255,255,0.5);
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
.stat span { display: block; color: var(--muted); font-size: 12px; margin-bottom: 8px; }
.stat strong { font-size: 28px; }
.workspace {
grid-template-columns: 380px minmax(0, 1fr);
align-items: start;
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
.triple {
grid-template-columns: repeat(3, minmax(0, 1fr));
2026-03-18 16:43:04 +08:00
}
2026-03-19 13:53:49 +08:00
.flow {
2026-03-18 16:43:04 +08:00
display: grid;
2026-03-19 13:53:49 +08:00
grid-template-columns: repeat(6, minmax(0, 1fr));
gap: 12px;
margin-top: 14px;
}
.step, .lab, .note, .code-card {
border: 1px solid var(--line);
border-radius: 20px;
padding: 16px;
background: rgba(255,255,255,0.45);
}
.step strong, .lab strong, .code-card strong { display: block; margin-bottom: 8px; }
.lab small, .step small, .note small { color: var(--muted); display: block; line-height: 1.7; }
.field {
display: flex;
flex-direction: column;
gap: 8px;
2026-03-18 16:43:04 +08:00
margin-top: 12px;
}
2026-03-19 13:53:49 +08:00
label { font-size: 13px; font-weight: 700; color: #21384f; }
input, select {
width: 100%;
border: 1px solid var(--line);
border-radius: 14px;
padding: 12px 14px;
background: transparent;
2026-03-18 16:43:04 +08:00
color: var(--text);
2026-03-19 13:53:49 +08:00
outline: none;
}
.console {
margin-top: 14px;
border-radius: 18px;
overflow: hidden;
border: 1px solid #d6e2ef;
background: #0e1723;
}
.console-head {
padding: 12px 14px;
border-bottom: 1px solid rgba(216, 228, 240, 0.14);
color: #bdd2ea;
font-weight: 700;
}
pre {
margin: 0;
min-height: 240px;
padding: 16px;
color: #dceaff;
white-space: pre-wrap;
font-family: Consolas, "Courier New", monospace;
overflow: auto;
}
.pill {
display: inline-flex;
padding: 6px 10px;
border-radius: 999px;
background: rgba(15, 103, 181, 0.08);
color: var(--accent);
font-size: 12px;
font-weight: 700;
}
.list {
display: flex;
flex-direction: column;
gap: 10px;
margin-top: 14px;
}
.list-item {
padding: 14px;
border-radius: 18px;
2026-03-18 16:43:04 +08:00
border: 1px solid var(--line);
2026-03-19 13:53:49 +08:00
background: rgba(255,255,255,0.45);
}
.list-item p { margin-top: 8px; }
@media (max-width: 1180px) {
.hero-grid, .workspace, .triple, .flow, .stats { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 780px) {
.page { padding: 14px; }
.hero-grid, .workspace, .triple, .flow, .stats { grid-template-columns: 1fr; }
2026-03-18 16:43:04 +08:00
}
2026-03-07 05:43:15 +00:00
< / style >
< / head >
< body >
2026-03-18 16:43:04 +08:00
< div class = "page" >
< section class = "hero" >
2026-03-19 13:53:49 +08:00
< div class = "hero-grid" >
< div >
< div class = "eyebrow" > Spring Boot Learning Cockpit< / div >
< h1 > Use one workspace to understand MVC, validation, security, AOP, and application events.< / h1 >
< p >
This homepage is now a guided study cockpit. Instead of only linking to pages, it explains the request
path, suggests experiment sequences, and lets you call real endpoints to observe how the demo behaves.
< / p >
< div class = "actions" style = "margin-top:18px;" >
< a class = "btn" href = "/users.html" > Open user lab< / a >
< a class = "btn-soft" href = "/aop.html" > Open AOP lab< / a >
< a class = "btn-soft" href = "/events.html" > Open event lab< / a >
< a class = "btn-soft" href = "/learn" > Open MVC learn API< / a >
< / div >
< div class = "stats" >
< div class = "stat" > < span > Core labs< / span > < strong > 4< / strong > < / div >
< div class = "stat" > < span > Major layers< / span > < strong > 6< / strong > < / div >
< div class = "stat" > < span > Interactive pages< / span > < strong > 4< / strong > < / div >
< div class = "stat" > < span > Tested backend paths< / span > < strong > 2+< / strong > < / div >
< / div >
< / div >
< div class = "card" style = "padding:0;" >
< div class = "card" style = "box-shadow:none; border:none; border-radius:28px;" >
< div class = "eyebrow" > Start Here< / div >
< h2 > Recommended study order< / h2 >
< div class = "list" >
< div class = "list-item" >
< strong > 1. Learn endpoint binding< / strong >
< p > Hit the live API explorer below and compare query, path, header, cookie, and JSON body patterns.< / p >
< / div >
< div class = "list-item" >
< strong > 2. Study users and validation< / strong >
< p > Open the user lab to inspect CRUD, duplicate email handling, and aggregate stats.< / p >
< / div >
< div class = "list-item" >
< strong > 3. Watch cross-cutting behavior< / strong >
< p > Move to AOP and events to see timing, rate limiting, and listener history.< / p >
< / div >
< / div >
< / div >
< / div >
2026-03-07 05:43:15 +00:00
< / div >
2026-03-18 16:43:04 +08:00
< / section >
2026-03-07 05:43:15 +00:00
2026-03-19 13:53:49 +08:00
< section class = "card" style = "margin-bottom:18px;" >
< div class = "eyebrow" > Architecture< / div >
< h2 > How one request travels through the demo< / h2 >
< div class = "flow" >
< div class = "step" > < strong > Browser< / strong > < small > Form submit or fetch call starts the request.< / small > < / div >
< div class = "step" > < strong > Security< / strong > < small > JWT demo routes decide whether the request is public or protected.< / small > < / div >
< div class = "step" > < strong > Controller< / strong > < small > Spring binds params, body, headers, and cookies into method arguments.< / small > < / div >
< div class = "step" > < strong > Service< / strong > < small > Business rules run, such as duplicate email checks or stats calculation.< / small > < / div >
< div class = "step" > < strong > AOP / Events< / strong > < small > Cross-cutting timing or event listeners react without cluttering core logic.< / small > < / div >
< div class = "step" > < strong > Response< / strong > < small > Structured JSON or HTML returns to the page and becomes visible feedback.< / small > < / div >
< / div >
2026-03-18 16:43:04 +08:00
< / section >
2026-03-19 13:53:49 +08:00
< div class = "workspace" >
< aside class = "card" >
< div class = "eyebrow" > Lab Tracks< / div >
< h2 > What to practice in each area< / h2 >
< div class = "list" >
< div class = "lab" >
< strong > User management< / strong >
< small > Create a user, trigger duplicate email protection, search records, and compare stats before and after changes.< / small >
< / div >
< div class = "lab" >
< strong > MVC parameter binding< / strong >
< small > Use `/learn` routes to compare `@RequestParam`, `@PathVariable`, `@RequestBody`, `@RequestHeader`, and `@CookieValue`.< / small >
< / div >
< div class = "lab" >
< strong > AOP tracing< / strong >
< small > Trigger `/api/users` and `/api/users/stats`, then inspect `/aop/aop/stats` to see which methods were counted.< / small >
< / div >
< div class = "lab" >
< strong > Application events< / strong >
< small > Publish LOGIN or CREATED events and refresh event history to understand publisher-listener decoupling.< / small >
< / div >
< / div >
< div class = "eyebrow" style = "margin-top:20px;" > Code Reading Map< / div >
< h2 > Files worth reading next< / h2 >
< div class = "list" >
< div class = "code-card" >
< strong > UserController -> UserService< / strong >
< small > Shows validation, CRUD orchestration, search, and stats aggregation.< / small >
< / div >
< div class = "code-card" >
< strong > LearningSecurityConfig + LearningJwtFilter< / strong >
< small > Explains why most labs stay public while `/api/secure/**` stays protected.< / small >
< / div >
< div class = "code-card" >
< strong > PerformanceAspect + UserEventPublisher + UserEventListener< / strong >
< small > Shows the two cleanest examples of cross-cutting and event-driven behavior.< / small >
< / div >
< / div >
< / aside >
< main class = "triple" >
< section class = "card" style = "grid-column: 1 / -1;" >
< div class = "eyebrow" > Live Explorer< / div >
< h2 > Call real endpoints without leaving the page< / h2 >
< p > Use these controls to inspect real JSON responses while you read the code. This makes the project easier to connect to concrete behavior.< / p >
< div class = "toolbar" style = "margin-top:14px;" >
< button class = "btn" type = "button" onclick = "loadEndpoint('/actuator/health')" > Health< / button >
< button class = "btn-soft" type = "button" onclick = "loadEndpoint('/api/users/stats')" > User stats< / button >
< button class = "btn-soft" type = "button" onclick = "loadEndpoint('/learn')" > Learn overview< / button >
< button class = "btn-soft" type = "button" onclick = "loadEndpoint('/aop/aop/stats')" > AOP stats< / button >
< button class = "btn-soft" type = "button" onclick = "loadEndpoint('/aop/event/history')" > Event history< / button >
< / div >
< div class = "triple" style = "margin-top:16px;" >
< div class = "card" style = "padding:0; box-shadow:none; background:transparent; border:none;" >
< div class = "field" >
< label for = "eventType" > Publish demo event< / label >
< select id = "eventType" >
< option value = "LOGIN" > LOGIN< / option >
< option value = "CREATED" > CREATED< / option >
< option value = "UPDATED" > UPDATED< / option >
< option value = "DELETED" > DELETED< / option >
< / select >
< / div >
< / div >
< div class = "card" style = "padding:0; box-shadow:none; background:transparent; border:none;" >
< div class = "field" >
< label for = "eventUserId" > User id< / label >
< input id = "eventUserId" value = "99" >
< / div >
< / div >
< div class = "card" style = "padding:0; box-shadow:none; background:transparent; border:none;" >
< div class = "field" >
< label for = "eventUserName" > User name< / label >
< input id = "eventUserName" value = "learning-user" >
< / div >
< / div >
< / div >
< div class = "toolbar" style = "margin-top:14px;" >
< button class = "btn" type = "button" onclick = "publishEvent()" > Publish event< / button >
< button class = "btn-soft" type = "button" onclick = "loadEndpoint('/api/users')" > Load users< / button >
< / div >
< div class = "console" >
< div class = "console-head" > Endpoint output< / div >
< pre id = "consoleOutput" > Select an experiment above to load live output.< / pre >
< / div >
< / section >
< section class = "card" >
< div class = "eyebrow" > Experiment 1< / div >
< h2 > Trace validation< / h2 >
< p > Open the user lab, create a user, then repeat with the same email. Compare the frontend error with `DuplicateEmailException` and the global exception handler.< / p >
< div class = "chip-list" style = "margin-top:12px;" >
< span class = "pill" > UserController< / span >
< span class = "pill" > UserService< / span >
< span class = "pill" > GlobalExceptionHandler< / span >
< / div >
< / section >
< section class = "card" >
< div class = "eyebrow" > Experiment 2< / div >
< h2 > Trace AOP timing< / h2 >
< p > Load users and stats several times, then call `/aop/aop/stats`. Watch how controller and service methods accumulate timing and call count data.< / p >
< div class = "chip-list" style = "margin-top:12px;" >
< span class = "pill" > PerformanceAspect< / span >
< span class = "pill" > @Around< / span >
< span class = "pill" > Cross-cutting< / span >
< / div >
< / section >
< section class = "card" >
< div class = "eyebrow" > Experiment 3< / div >
< h2 > Trace event decoupling< / h2 >
< p > Publish CREATED and LOGIN events, then reload event history. This shows how the request can finish while listeners keep handling side effects.< / p >
< div class = "chip-list" style = "margin-top:12px;" >
< span class = "pill" > Publisher< / span >
< span class = "pill" > Listener< / span >
< span class = "pill" > @Async< / span >
< / div >
< / section >
< / main >
< / div >
2026-03-18 16:43:04 +08:00
< / div >
2026-03-19 13:53:49 +08:00
< script >
async function loadEndpoint(path, options = {}) {
const output = document.getElementById('consoleOutput');
output.textContent = 'Loading ' + path + ' ...';
try {
const response = await fetch(path, options);
const contentType = response.headers.get('content-type') || '';
if (contentType.includes('application/json')) {
const json = await response.json();
output.textContent = JSON.stringify(json, null, 2);
} else {
output.textContent = await response.text();
}
} catch (error) {
output.textContent = 'Request failed: ' + error.message;
}
}
async function publishEvent() {
const type = document.getElementById('eventType').value;
const userId = document.getElementById('eventUserId').value.trim() || '99';
const userName = document.getElementById('eventUserName').value.trim() || 'learning-user';
const params = new URLSearchParams({
userId,
userName,
eventType: type
});
await loadEndpoint('/aop/event/publish?' + params.toString(), { method: 'POST' });
}
< / script >
2026-03-07 05:43:15 +00:00
< / body >
2026-03-18 16:43:04 +08:00
< / html >
