diff --git a/src/main/java/me/ehlxr/ContentReplace.java b/src/main/java/me/ehlxr/ContentReplace.java
new file mode 100644
index 0000000..a2b6cb0
--- /dev/null
+++ b/src/main/java/me/ehlxr/ContentReplace.java
@@ -0,0 +1,76 @@
+package me.ehlxr;
+
+import java.io.*;
+
+/**
+ * Created by lixiangrong on 2017/11/17.
+ */
+public class ContentReplace {
+    private static int total = 0;
+    private static int unDeal = 0;
+
+    public static void main(String[] args) throws IOException {
+        File dir = new File("/Users/ehlxr/WorkSpaces/enncloud/Ceres");
+        deal(dir);
+        System.out.println("总文件数：" + total);
+        System.out.println("未处理文件数：" + unDeal);
+    }
+
+    private static void deal(File file) throws IOException {
+        if (file.isDirectory()) {
+            File[] fs = file.listFiles(((dir, name) -> {
+                File f = new File(dir.getPath() + File.separator + name);
+
+                return (f.getPath().contains("src") && name.endsWith(".java")) || f.isDirectory();
+            }));
+
+            for (File f : fs != null ? fs : new File[0]) {
+                deal(f);
+            }
+        } else {
+            ++total;
+            // System.out.println(file.getPath());
+
+            File tmp = File.createTempFile("tmp", null);
+            try (
+                    FileOutputStream tmpOut = new FileOutputStream(tmp);
+                    FileInputStream tmpIn = new FileInputStream(tmp);
+                    RandomAccessFile raf = new RandomAccessFile(file, "rw")) {
+                byte[] buf = new byte[64];
+                int hasRead;
+                while ((hasRead = raf.read(buf)) > 0) {
+                    if (new String(buf).startsWith("/*")) {
+                        ++unDeal;
+                        System.out.println("未处理文件：" + file.getPath());
+                        return;
+                    }
+                    // 把原有内容读入临时文件
+                    tmpOut.write(buf, 0, hasRead);
+                }
+                raf.seek(0L);
+                String tmpl = "/*\n" +
+                        " * Copyright 2017-2017 the original author or authors.\n" +
+                        " *\n" +
+                        " * Licensed under the Apache License, Version 2.0 (the \"License\");\n" +
+                        " * you may not use this file except in compliance with the License.\n" +
+                        " * You may obtain a copy of the License at\n" +
+                        " *\n" +
+                        " *      http://www.apache.org/licenses/LICENSE-2.0\n" +
+                        " *\n" +
+                        " * Unless required by applicable law or agreed to in writing, software\n" +
+                        " * distributed under the License is distributed on an \"AS IS\" BASIS,\n" +
+                        " * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n" +
+                        " * See the License for the specific language governing permissions and\n" +
+                        " * limitations under the License.\n" +
+                        " */\n\n";
+                raf.write(tmpl.getBytes());
+                // 追加临时文件内容
+                while ((hasRead = tmpIn.read(buf)) > 0) {
+                    raf.write(buf, 0, hasRead);
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/me/ehlxr/powermock/ClassUnderTest.java b/src/main/java/me/ehlxr/powermock/ClassUnderTest.java
index b7e882e..164ba3c 100644
--- a/src/main/java/me/ehlxr/powermock/ClassUnderTest.java
+++ b/src/main/java/me/ehlxr/powermock/ClassUnderTest.java
@@ -10,6 +10,8 @@ import java.io.File;
  * Created by lixiangrong on 2017/7/21.
  */
 public class ClassUnderTest {
+    private String f1 = "test";
+
     public boolean callArgumentInstance(File file) {
         return file.exists();
     }
diff --git a/src/main/java/me/ehlxr/powermock/TestClassUnderTest.java b/src/main/java/me/ehlxr/powermock/TestClassUnderTest.java
index 6d17f9a..840396b 100644
--- a/src/main/java/me/ehlxr/powermock/TestClassUnderTest.java
+++ b/src/main/java/me/ehlxr/powermock/TestClassUnderTest.java
@@ -6,6 +6,7 @@ import org.junit.runner.RunWith;
 import org.powermock.api.mockito.PowerMockito;
 import org.powermock.core.classloader.annotations.PrepareForTest;
 import org.powermock.modules.junit4.PowerMockRunner;
+import org.powermock.reflect.Whitebox;
 
 import java.io.File;
 
@@ -102,4 +103,13 @@ public class TestClassUnderTest {
         when(dependency.isGod(anyString())).thenReturn(true);
         Assert.assertTrue(underTest.callDependency());
     }
+
+    @Test
+    @PrepareForTest(ClassUnderTest.class)
+    public void testInvokPrivate() throws Exception {
+        ClassUnderTest underTest = spy(new ClassUnderTest());
+
+        Whitebox.invokeMethod(underTest, "isExist");
+        verifyPrivate(underTest).invoke("isExist");
+    }
 }
\ No newline at end of file