修改自定义类加载器

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

@@ -1,9 +1,49 @@
 package club.shengsheng;
 
 
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+
 /**
  * @author [email protected]
  **/
 public class MyClassLoader extends ClassLoader {
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+        File file = new File(System.getProperty("user.dir"), "加密.class");
+        byte[] bytes;
+        try {
+            bytes = Files.readAllBytes(file.toPath());
+        } catch (IOException e) {
+            throw new ClassNotFoundException(name);
+        }
+
+        for (int i = 0; i < bytes.length; i++) {
+            bytes[i] -= 1;
+        }
+
+        return defineClass(name, bytes, 0, bytes.length);
+    }
 
+    @Override
+    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+        synchronized (getClassLoadingLock(name)) {
+            // 判断类是否已经加载
+            Class<?> c = findLoadedClass(name);
+            if (c == null) {
+                if ("tech.insight.ShengSheng".equals(name)) {
+                    // 只有在符合条件的情况下走我们的逻辑
+                    c = findClass(name);
+                } else {
+                    // Object类需要通过BootStrap加载
+                    c = getParent().loadClass(name);
+                }
+            }
+            if (resolve) {
+                resolveClass(c);
+            }
+            return c;
+        }
+    }
 }