feat(类加载器): 实现自定义类加载器逻辑

src/main/java/club/shengsheng/MyClassLoader.java

@@ -1,9 +1,47 @@
 package club.shengsheng;
 
 
+import java.io.File;
+import java.nio.file.Files;
+
 /**
  * @author gongxuanzhangmelt@gmail.com
  **/
 public class MyClassLoader extends ClassLoader {
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+        try {
+            // 获取项目根目录路径
+            String projectRoot = System.getProperty("user.dir");
+            File encryptedFile = new File(projectRoot + File.separator + "加密.class");
+            byte[] bytes = Files.readAllBytes(encryptedFile.toPath());
+
+            for (int i = 0; i < bytes.length; i++) {
+                bytes[i] = (byte) (bytes[i] - 1);
+            }
+            return defineClass(name, bytes, 0, bytes.length);
+        } catch (Exception e) {
+            throw new ClassNotFoundException(name, e);
+        }
+    }
+
 
+    @Override
+    public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+        // copy原ClassLoader中的实现，将双亲委派逻辑去掉，并判断tech包下的类由自定义的类加载器加载
+        synchronized (getClassLoadingLock(name)) {
+            Class<?> c = findLoadedClass(name);
+            if (c == null) {
+                if (name.startsWith("tech")) {
+                    c = findClass(name);
+                } else {
+                    c = getParent().loadClass(name);
+                }
+            }
+            if (resolve) {
+                resolveClass(c);
+            }
+            return c;
+        }
+    }
 }