feat:自定义类加载器逻辑

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

@@ -1,9 +1,53 @@
 package club.shengsheng;
 
+import java.io.File;
+import java.nio.file.Files;
 
 /**
  * @author gongxuanzhangmelt@gmail.com
  **/
 public class MyClassLoader extends ClassLoader {
 
+    private static final String MY_CLASS_NAME = "tech.insight.ShengSheng";
+
+    private static final String MY_CLASS_PATH = "加密.class";
+
+    // 修改加载类的逻辑 当前这个类由我们自己定义的类加载器定义
+    @Override
+    protected Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
+        synchronized (getClassLoadingLock(name)) {
+            Class<?> c = findLoadedClass(name);
+            if (c == null) {
+                try {
+                    if(name.startsWith(MY_CLASS_NAME)) {
+                        c = findClass(name);
+                    } else {
+                        return super.loadClass(name, resolve);
+                    }
+                } catch (ClassNotFoundException e) {
+                    // ClassNotFoundException thrown if class not found
+                    // from the non-null parent class loader
+                }
+            }
+            if (resolve) {
+                resolveClass(c);
+            }
+            return c;
+        }
+    }
+
+    @Override
+    protected Class<?> findClass(final String name)
+            throws ClassNotFoundException {
+        try {
+            File classFile = new File(".", MY_CLASS_PATH);
+            byte[] bytes = Files.readAllBytes(classFile.toPath());
+            for(int i = 0; i < bytes.length; i++) {
+                bytes[i]--;
+            }
+            return defineClass(name, bytes, 0, bytes.length);
+        } catch (Exception e) {
+            throw new ClassNotFoundException(name);
+        }
+    }
 }