解决注解初始化逻辑不自动执行问题

README.md

@@ -0,0 +1,9 @@
+# 使用方式
+
+在主入口函数增加如下注解:
+
+```bash
+@Import(value = { cn.zhangdeman.HashMapCache.class}) // 让SpringBoot能够扫描到相关组件
+```
+
+会自动扫描自定义的异常注解, 并进行数据初始化

pom.xml

@@ -24,6 +24,12 @@
             <artifactId>lombok</artifactId>
             <version>1.18.30</version>
         </dependency>
+        <dependency>
+            <groupId>jakarta.servlet</groupId>
+            <artifactId>jakarta.servlet-api</artifactId>
+            <version>6.1.0</version>
+            <scope>provided</scope>
+        </dependency>
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>

src/main/java/cn/zhangdeman/HashMapCache.java

@@ -1,6 +1,9 @@
 package cn.zhangdeman;
 
 import cn.zhangdeman.annotation.CustomExceptionScanAnnotation;
+import jakarta.servlet.ServletContextEvent;
+import jakarta.servlet.ServletContextListener;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.ApplicationContext;
 import org.springframework.core.annotation.AnnotationUtils;
 import org.springframework.util.ClassUtils;
@@ -12,16 +15,18 @@ import java.util.*;
 
 // 基于hashmap实现的内存缓存
 // 因为就是服务启动时初始化一次, 无需考虑多线程并发安全问题
-public class HashMapCache {
+public class HashMapCache implements ServletContextListener {
     // 单例: 饿汉模式
     private static final HashMapCache hashMapCache = new HashMapCache();
     private final Map<Object, String> cache = new HashMap<>();
+    @Autowired
+    private ApplicationContext applicationContext;
     //将构造器设置为private禁止通过new进行实例化
     private HashMapCache() {
 
     }
     // 此处实现的是自定义注解的解析逻辑, 将错误码全部加载到内存中
-    public void loadCustomException(ApplicationContext applicationContext) throws ClassNotFoundException, InvocationTargetException, IllegalAccessException, NoSuchMethodException, InstantiationException {
+    public void loadCustomException() throws ClassNotFoundException, InvocationTargetException, IllegalAccessException, NoSuchMethodException, InstantiationException {
         Map<String, Object> customExceptionScanAnnotationMap = applicationContext.getBeansWithAnnotation(CustomExceptionScanAnnotation.class);
         for(Object bean : customExceptionScanAnnotationMap.values()){
             Class<?> extensionClz = ClassUtils.getUserClass(bean);
@@ -117,4 +122,26 @@ public class HashMapCache {
         }
         return classList;
     }
+
+    @Override
+    public void contextInitialized(ServletContextEvent sce) {
+        System.out.println("包内自动触发初始化" + new Date());
+        try {
+            this.loadCustomException();
+        } catch (ClassNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (InvocationTargetException e) {
+            throw new RuntimeException(e);
+        } catch (IllegalAccessException e) {
+            throw new RuntimeException(e);
+        } catch (NoSuchMethodException e) {
+            throw new RuntimeException(e);
+        } catch (InstantiationException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    @Override
+    public void contextDestroyed(ServletContextEvent sce) {
+    }
 }