From 2edd1780cd94be18894d5adea37ca8d75fc7a2da Mon Sep 17 00:00:00 2001
From: XianReallyHot-ZZH <741788769@qq.com>
Date: Mon, 2 Jun 2025 20:44:48 +0800
Subject: [PATCH 1/2] =?UTF-8?q?feat:=E5=AE=8C=E6=88=90=E8=87=AA=E5=AE=9A?=
 =?UTF-8?q?=E4=B9=89=E7=B1=BB=E5=8A=A0=E8=BD=BD=E5=99=A8=E7=9A=84=E8=87=AA?=
 =?UTF-8?q?=E5=AE=9A=E4=B9=89=E5=8A=A0=E8=BD=BD=E9=80=BB=E8=BE=91?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../java/club/shengsheng/MyClassLoader.java   | 64 +++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/src/main/java/club/shengsheng/MyClassLoader.java b/src/main/java/club/shengsheng/MyClassLoader.java
index 21026cf..e2f49d1 100644
--- a/src/main/java/club/shengsheng/MyClassLoader.java
+++ b/src/main/java/club/shengsheng/MyClassLoader.java
@@ -1,9 +1,73 @@
 package club.shengsheng;
 
 
+import java.io.ByteArrayOutputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+
 /**
  * @author gongxuanzhangmelt@gmail.com
  **/
 public class MyClassLoader extends ClassLoader {
 
+    /**
+     * 重写findClass方法，让其查找我们指定路径下的class文件，并完成定义加载
+     *
+     * @param name
+     * @return
+     * @throws ClassNotFoundException
+     */
+    @Override
+    protected Class<?> findClass(String name) throws ClassNotFoundException {
+        // 1、读取项目根目录中的加密.class文件，获取class文件的字节数组
+        String filePath = "D:\\Developer\\Github\\shengshengjava\\custom-classloader\\加密.class";
+        byte[] classBytes = readClassFile(filePath);
+
+        if (classBytes == null) {
+            throw new ClassNotFoundException("无法加载类：" + name);
+        }
+
+        // 2、解密字节数组，并返回解密后的字节数组。解密规则：每个字节减1
+        classBytes = decryptClassBytes(classBytes);
+
+        return defineClass(name, classBytes, 0, classBytes.length);
+    }
+
+    private byte[] decryptClassBytes(byte[] classBytes) {
+        for (int i = 0; i < classBytes.length; i++) {
+            classBytes[i] = (byte) (classBytes[i] - 1);
+        }
+        return classBytes;
+    }
+
+    /**
+     * 读取class文件到字节数组
+     *
+     * @param filePath class文件路径
+     * @return 字节数组 或 null
+     */
+    private byte[] readClassFile(String filePath) {
+        File file = new File(filePath);
+        if (!file.exists()) {
+            System.err.println("文件不存在: " + filePath);
+            return null;
+        }
+
+        try (FileInputStream fis = new FileInputStream(file);
+             ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
+
+            byte[] buffer = new byte[1024];
+            int bytesRead;
+            while ((bytesRead = fis.read(buffer)) != -1) {
+                baos.write(buffer, 0, bytesRead);
+            }
+            return baos.toByteArray();
+
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
 }

From b59d82c4fa74ee1800b0d884bff4caac22a8349f Mon Sep 17 00:00:00 2001
From: XianReallyHot-ZZH <741788769@qq.com>
Date: Mon, 2 Jun 2025 20:58:53 +0800
Subject: [PATCH 2/2] =?UTF-8?q?fix:=E7=9B=B8=E5=AF=B9=E8=B7=AF=E5=BE=84?=
 =?UTF-8?q?=E5=AE=9E=E7=8E=B0=E8=AF=BB=E5=8F=96?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/main/java/club/shengsheng/MyClassLoader.java | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/club/shengsheng/MyClassLoader.java b/src/main/java/club/shengsheng/MyClassLoader.java
index e2f49d1..5abee0a 100644
--- a/src/main/java/club/shengsheng/MyClassLoader.java
+++ b/src/main/java/club/shengsheng/MyClassLoader.java
@@ -21,7 +21,8 @@ public class MyClassLoader extends ClassLoader {
     @Override
     protected Class<?> findClass(String name) throws ClassNotFoundException {
         // 1、读取项目根目录中的加密.class文件，获取class文件的字节数组
-        String filePath = "D:\\Developer\\Github\\shengshengjava\\custom-classloader\\加密.class";
+        String projectDir = System.getProperty("user.dir"); // 获取项目根目录
+        String filePath = projectDir + File.separator + "加密.class";
         byte[] classBytes = readClassFile(filePath);
 
         if (classBytes == null) {