feat: Spring Boot 学习脚手架 v2.0
- 新增 IoC 容器学习模块 - 新增 AOP 切面编程学习模块 - 新增 MyBatis 集成学习模块 - 新增事务管理学习模块 - 新增用户/产品/订单 CRUD - 新增 7 个交互式学习页面 - 集成性能监控切面
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likingcode
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package com.example.scaffold.learning;
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import com.example.scaffold.aop.PerformanceAspect;
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import lombok.RequiredArgsConstructor;
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import org.springframework.beans.BeansException;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.beans.factory.annotation.Qualifier;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.Scope;
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import org.springframework.web.bind.annotation.*;
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import org.springframework.web.context.WebApplicationContext;
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import jakarta.annotation.PostConstruct;
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import jakarta.annotation.PreDestroy;
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import java.util.*;
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/**
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* IoC 容器学习控制器
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*
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* 学习要点：
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* 1. Bean 的生命周期
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* 2. 依赖注入方式
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* 3. Bean 作用域
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* 4. 条件化配置
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*/
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@RestController
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@RequestMapping("/api/learning/ioc")
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@RequiredArgsConstructor
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public class IocLearningController {
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private final ApplicationContext applicationContext;
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private final PerformanceAspect performanceAspect;
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// 演示字段注入（不推荐，但可以用）
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@Autowired
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@Qualifier("learningBean")
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private LearningBean learningBean;
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/**
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* 查看所有 Bean
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*/
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@GetMapping("/beans")
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public Map<String, Object> listBeans() {
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String[] beanNames = applicationContext.getBeanDefinitionNames();
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Map<String, Object> result = new LinkedHashMap<>();
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result.put("total", beanNames.length);
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result.put("userBeans", Arrays.stream(beanNames)
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.filter(name -> name.startsWith("user") || name.startsWith("learning") ||
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name.contains("Service") || name.contains("Controller") || name.contains("Mapper"))
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.sorted()
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.toList());
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result.put("allBeans", Arrays.stream(beanNames).sorted().toList());
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return result;
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}
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/**
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* 查看 Bean 详情
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*/
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@GetMapping("/beans/{name}")
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public Map<String, Object> getBeanDetail(@PathVariable String name) {
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try {
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Object bean = applicationContext.getBean(name);
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Class<?> clazz = bean.getClass();
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return Map.of(
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"name", name,
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"type", clazz.getName(),
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"simpleName", clazz.getSimpleName(),
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"interfaces", Arrays.toString(clazz.getInterfaces()),
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"annotations", Arrays.toString(clazz.getAnnotations()),
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"scope", applicationContext.isSingleton(name) ? "singleton" : "prototype"
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);
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} catch (BeansException e) {
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return Map.of("error", "Bean not found: " + name);
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}
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}
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/**
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* 演示依赖注入方式
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*/
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@GetMapping("/injection-types")
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public Map<String, String> injectionTypes() {
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return Map.of(
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"构造器注入", "推荐！明确依赖，不可变，易于测试",
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"Setter注入", "可选依赖，灵活性高",
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"字段注入", "不推荐！隐藏依赖，难以测试",
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"本控制器使用", "构造器注入 (RequiredArgsConstructor) + 字段注入演示"
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);
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}
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/**
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* 演示 Bean 作用域
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*/
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@GetMapping("/scopes")
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public Map<String, Object> scopes() {
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return Map.of(
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"singleton", "单例 - 整个应用只有一个实例（默认）",
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"prototype", "原型 - 每次请求都创建新实例",
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"request", "请求 - 每个 HTTP 请求一个实例",
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"session", "会话 - 每个 HTTP 会话一个实例",
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"demo", learningBean.getInstanceInfo()
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);
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}
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/**
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* 性能统计
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*/
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@GetMapping("/performance")
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public Map<String, Object> getPerformance() {
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var stats = performanceAspect.getStats();
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Map<String, Object> result = new LinkedHashMap<>();
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stats.forEach((key, value) -> {
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long totalMs = value.totalTime.get() / 1_000_000;
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long avgMs = value.totalCount.get() > 0 ? totalMs / value.totalCount.get() : 0;
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result.put(key, Map.of(
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"count", value.totalCount.get(),
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"errors", value.errorCount.get(),
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"totalMs", totalMs,
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"avgMs", avgMs,
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"maxMs", value.maxTime.get()
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));
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});
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return result;
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}
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/**
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* 重置性能统计
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*/
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@PostMapping("/performance/reset")
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public Map<String, String> resetPerformance() {
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performanceAspect.resetStats();
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return Map.of("status", "ok", "message", "性能统计已重置");
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}
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/**
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* 学习 Bean - 演示作用域和生命周期
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*/
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@org.springframework.stereotype.Component("learningBean")
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@Scope(WebApplicationContext.SCOPE_SESSION)
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public static class LearningBean {
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private final String instanceId = UUID.randomUUID().toString().substring(0, 8);
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private int accessCount = 0;
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@PostConstruct
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public void init() {
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System.out.println("🟢 [LearningBean @PostConstruct] Bean 初始化: " + instanceId);
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}
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@PreDestroy
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public void destroy() {
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System.out.println("🔴 [LearningBean @PreDestroy] Bean 销毁: " + instanceId);
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}
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public String getInstanceInfo() {
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accessCount++;
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return String.format("实例ID: %s, 访问次数: %d, 作用域: session", instanceId, accessCount);
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}
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}
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}
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