java編譯混淆

1. java娣鋒穯緙栬瘧鍣

銆銆銆銆鏈榪戣瘯鐢ㄤ簡鍑犱釜Java娣鋒穯鍣(Java Obfuscator) 鎰熻夋病鏈変竴涓瀹屽叏鍙︿漢婊℃剰鐨 浜庢槸鎯沖共鑴嗚嚜宸卞啓涓涓寰椾簡 緲諱簡鍑犻〉Java鉶氭嫙鏈鴻勮寖涔嬪悗紿佸彂濂囨兂 鍒鐨勬販娣嗗櫒閮芥槸鍦ㄧ紪璇戝ソ鐨刡yte code涓婂仛鏂囩珷 鑳戒笉鑳戒粠婧愮爜鐩存帴緙栬瘧鎴愮粡榪囨販娣嗙殑class鏂囦歡鍛錛熷氨榪欐牱鑺變簡涓涓澶氭槦鏈熺殑鏃墮棿鍐欎簡涓涓狫ava娣鋒穯緙栬瘧鍣(Java Obfuscator Compiler) 銆銆銆銆 Q: 浠涔堟槸娣鋒穯鍣錛 銆銆銆銆A: 鐢變簬Java紼嬪簭榪愯屾椂鏄鍔ㄦ佽繛鎺ョ殑 鍥犳ょ紪璇戞垚鐨勭洰鏍囨枃浠朵腑鍖呭惈鏈夌﹀彿琛 浣垮緱Java紼嬪簭寰堝規槗琚鍙嶇紪璇 娣鋒穯鍣ㄥ彲浠ユ墦涔眂lass鏂囦歡涓鐨勭﹀彿淇℃伅 浣垮弽鍚戝伐紼嬪彉寰楅潪甯稿洶闅 銆銆銆銆 Q: 鐜版湁鐨勬販娣嗗櫒鏈変粈涔堥棶棰橈紵 銆銆銆銆A: 鐜版湁鐨勬販娣嗗櫒閮芥槸瀵圭紪璇戝ソ鐨刢lass鏂囦歡榪涜屾販娣 榪欐牱灝遍渶瑕佺紪璇戝拰娣鋒穯涓や釜姝ラ 騫朵笉鏄鎵鏈夌殑絎﹀彿閮介渶瑕佹販娣 濡傛灉浣犲紑鍙戠殑鏄涓涓綾誨簱 鎴栬呮煇浜涚被闇瑕佸姩鎬佽呰澆 閭ｄ簺鍏鍏盇PI灝卞繀欏諱繚鐣欑﹀彿涓嶅彉 榪欐牱鍒浜烘墠鑳戒嬌鐢ㄤ綘鐨勭被搴 鐜版湁鐨勬販娣嗗櫒鎻愪緵浜咷UI鎴栬剼鏈鐨勬柟寮忔潵瀵歸偅浜涢渶瑕佷繚鐣欑殑絎﹀彿鍚嶇О榪涜岄厤緗 濡傛灉紼嬪簭杈冨ぇ鏃墮厤緗宸ヤ綔鍙樺緱寰堝嶆潅 鑰岀▼搴忎竴鏃︿慨鏀歸厤緗宸ヤ綔鍙堣侀噸鏂拌繘琛 鏌愪簺娣鋒穯鍣ㄨ兘澶熻皟鏁村瓧鑺傜爜鐨勯『搴 浣垮弽緙栬瘧鏇村姞鍥伴毦 浣嗘垜緇忓巻榪囨販娣嗕箣鍚庣殑紼嬪簭榪愯屽嚭閿欑殑鎯呭喌 銆銆銆銆 Q: Java娣鋒穯緙栬瘧鍣ㄦ槸濡備綍宸ヤ綔鐨勶紵 銆銆銆銆A: Java娣鋒穯緙栬瘧鍣ㄦ槸鍦⊿un JDK涓鎻愪緵鐨凧ava緙栬瘧鍣(javac)鐨勫熀紜涓婂畬鎴愮殑 淇鏀逛簡浠ｇ爜鐢熸垚榪囩▼ 瀵圭紪璇戝櫒鐢熸垚鐨勪腑闂翠唬鐮佽繘琛屾販娣 鏈鍚庡啀鐢熸垚class鏂囦歡 榪欐牱緙栬瘧鍜屾販娣嗗彧闇瑕佷竴涓姝ラゅ氨鍙浠ュ畬鎴 鍙﹀栧彲浠ュ湪婧愮▼搴忎腑鎻掑叆絎﹀彿淇濈暀鎸囦護鏉ユ帶鍒跺摢浜涚﹀彿闇瑕佷繚鐣 涓嶉渶瑕佸崟鐙鐨勯厤緗 銆銆銆銆 Q: 濡備綍瀹夎呭拰榪愯孞OC錛 銆銆銆銆A: 涓嬭澆joc jar () 榪愯宩ava jar joc jar灝卞彲浠ュ惎鍔↗ava娣鋒穯緙栬瘧鍣 joc鐨勫懡浠よ屽弬鏁板拰javac瀹屽叏鐩稿悓 浣嗗炲姞浜嗕竴涓鏂扮殑鍙傛暟 Xobfuscate 瀹冪殑鐢ㄦ硶濡備笅 銆銆銆銆 Xobfuscate:<level>銆銆鍏朵腑<level>鎸囧畾娣鋒穯綰у埆 鍙浠ユ槸浠ヤ笅鍑犵嶇駭鍒 銆銆銆銆 Xobfuscate:none銆銆銆銆涓嶈繘琛屾販娣嗐銆銆銆 Xobfuscate:private銆銆 瀵規墍鏈塸rivate璁塊棶綰у埆鐨勫厓緔犺繘琛屾販娣嗐銆銆銆 Xobfuscate:package銆銆 瀵規墍鏈塸rivate鎴杙ackage private鍏冪礌榪涜屾販娣嗐銆銆銆 Xobfuscate:protected銆 瀵規墍鏈塸rivate package private protected鍏冪礌榪涜屾販娣嗐銆銆銆 Xobfuscate:public銆銆銆瀵規墍鏈夌殑鍏冪礌閮借繘琛屾販娣嗐銆銆銆 Xobfuscate:all銆銆銆銆 鐩稿綋浜 Xobfuscate:public銆銆濡傛灉浣跨敤 Xobfuscate涓嶅甫綰у埆鍙傛暟 鍒欑浉褰撲簬 Xobfuscate:package銆銆銆銆 Q: 濡備綍浣跨敤絎﹀彿淇濈暀鎸囦護錛 銆銆銆銆A: 闄や簡鍦ㄥ懡浠よ岀敤 Xobfuscate鍙傛暟鎺у埗絎﹀彿娣鋒穯綰у埆澶 榪樺彲浠ュ湪婧愪唬鐮佷腑浣跨敤絎﹀彿淇濈暀鎸囦護鏉ユ帶鍒墮偅浜涚﹀彿闇瑕佷繚鐣 絎﹀彿淇濈暀鎸囦護鏄涓涓狫ava鏂囨。娉ㄩ噴鎸囦護 鍙浠ユ彃鍏ュ湪綾誨拰綾繪垚鍛樼殑鏂囨。娉ㄩ噴涓 渚嬪 銆銆銆銆 /**銆銆銆銆銆* This class should preserve 銆銆銆銆銆* @preserve銆銆銆銆銆*/銆銆銆銆 public class Foo {銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* You can specify which field should be preserved 銆銆銆銆銆銆銆* @preserve銆銆銆銆銆銆銆*/銆銆銆銆銆銆 private int x;銆銆銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* This field is not preserved 銆銆銆銆銆銆銆*/銆銆銆銆銆銆 private int y;銆銆銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* You can also preserve methods 銆銆銆銆銆銆銆* @preserve銆銆銆銆銆銆銆*/銆銆銆銆銆銆 public void hello() {}銆銆銆銆銆銆銆銆 /**銆銆銆銆銆銆銆* This method is not preserved 銆銆銆銆銆銆銆*/銆銆銆銆銆銆 private void collect() {}銆銆銆銆 }銆銆濡傛灉娌℃湁@preserve鎸囦護 鍒欐牴鎹娣鋒穯綰у埆鍙婃垚鍛樼殑璁塊棶綰у埆鏉ョ『瀹氱﹀彿鏄鍚︿繚鐣 銆銆銆銆瀵逛簬綾葷殑絎﹀彿淇濈暀鎸囦護鍙浠ラ檮甯︿竴涓淇?鐣欑駭鍒鍙傛暟 鏉ユ帶鍒剁被鎴愬憳鐨勭﹀彿淇濈暀 鍖呮嫭 銆銆銆銆 @preserve銆銆銆銆銆銆浠呭圭被鍚嶈繘琛屼繚鐣 綾繪垚鍛樼殑淇濈暀鏍規嵁 Xobfuscate鍛戒護琛屽弬鏁板喅瀹氥銆銆銆 @preserve public銆銆 淇濈暀鎵鏈塸ublic鎴愬憳銆銆銆銆 @preserve protected銆淇濈暀鎵鏈塸ublic鍜宲rotected鎴愬憳銆銆銆銆 @preserve package銆銆淇濈暀鎵鏈塸ublic protected package private鎴愬憳銆銆銆銆 @preserve private銆銆淇濈暀鎵鏈夋垚鍛樸銆銆銆 @preserve all銆銆銆銆鐩稿綋浜嶡preserve private銆銆銆銆 Q: JOC鏈夊摢浜涢檺鍒訛紵 銆銆銆銆A: 涓嶆敮鎸佸垎鍒緙栬瘧 蹇呴』瀵規墍鏈夌殑婧愭枃浠惰繘琛屾販娣嗙紪璇 銆銆銆銆銆銆鏈鍚庣粰鍑轟竴涓狫OC娣鋒穯鐨勬晥鏋 銆銆銆銆婧愭枃浠 銆銆銆銆import java awt event *;銆銆import javax swing *;銆銆銆銆public class AboutBox extends JDialog銆銆{銆銆 public AboutBox()銆銆 {銆銆銆銆 initform();銆銆 }銆銆銆銆 JPanel panel = new JPanel();銆銆 JButton button = new JButton();銆銆 JLabel jLabel = new JLabel();銆銆 JTextArea jTextArea = new JTextArea();銆銆銆銆 /**銆銆銆* NOTE: The following code is required by the form designer 銆銆銆* It can be modified using the form editor 銆Do not銆銆銆* modify it using the code editor 銆銆銆*/銆銆銆銆 private void initform()銆銆 {銆銆銆銆 this setDefaultCloseOperation( WindowConstants DISPOSE_ON_CLOSE );銆銆銆銆 this getContentPane() setLayout( new java awt CardLayout());銆銆銆銆 this setModal( true );銆銆銆銆 this setResizable( false );銆銆銆銆 this setTitle( About );銆銆銆銆 panel setLayout( null );銆銆銆銆 button setText( OK );銆銆銆銆 button setBounds( );銆銆銆銆 panel add( button );銆銆銆銆 jLabel setText( File System Viewer for Swing );銆銆銆銆 jLabel setVerticalAlignment( SwingConstants TOP );銆銆銆銆 jLabel setBounds( );銆銆銆銆 panel add( jLabel );銆銆銆銆 jTextArea setFont( new java awt Font( Dialog ));銆銆銆銆 jTextArea setLineWrap( true );銆銆銆銆 jTextArea setOpaque( false );銆銆銆銆 jTextArea setText( This puter program is protected by right law );銆銆銆銆 jTextArea setWrapstyleWord( true );銆銆銆銆 jTextArea setBounds( );銆銆銆銆 panel add( jTextArea );銆銆銆銆 this getContentPane() add( panel Card );銆銆銆銆 this setSize( );銆銆銆銆 button addActionListener( new java awt event ActionListener(){銆銆銆銆銆銆銆銆 public void actionPerformed( java awt event ActionEvent ev ){銆銆銆銆銆銆銆銆銆 ?銆button _actionPerformed( ev );銆銆銆銆銆銆銆銆 }});銆銆 }銆銆銆銆 private void button _actionPerformed(ActionEvent ev)銆銆 {銆銆銆銆 this dispose();銆銆 }銆銆}銆銆銆銆緇廕avac緙栬瘧鍚庣敤JAD鍙嶇紪璇戠殑緇撴灉 銆銆銆銆import java awt *;銆銆import java awt event ActionEvent;銆銆import java awt event ActionListener;銆銆import javax swing *;銆銆import javax swing text JTextComponent;銆銆銆銆public class AboutBox extends JDialog銆銆{銆銆銆銆 JPanel panel ;銆銆 JButton button ;銆銆 JLabel jLabel ;銆銆 JTextArea jTextArea ;銆銆銆銆 public AboutBox()銆銆 {銆銆銆銆 panel = new JPanel();銆銆銆銆 button = new JButton();銆銆銆銆 jLabel = new JLabel();銆銆銆銆 jTextArea = new JTextArea();銆銆銆銆 initform();銆銆 }銆銆銆銆 private void initform()銆銆 {銆銆銆銆 setDefaultCloseOperation( );銆銆銆銆 getContentPane() setLayout(new CardLayout());銆銆銆銆 setModal(true);銆銆銆銆 setResizable(false);銆銆銆銆 setTitle( About );銆銆銆銆 panel setLayout(null);銆銆銆銆 button setText( OK );銆銆銆銆 button setBounds( );銆銆銆銆 panel add(button );銆銆銆銆 jLabel setText( File System Viewer for Swing );銆銆銆銆 jLabel setVerticalAlignment( );銆銆銆銆 jLabel setBounds( );銆銆銆銆 panel add(jLabel );銆銆銆銆 jTextArea setFont(new Font( Dialog ));銆銆銆銆 jTextArea setLineWrap(true);銆銆銆銆 jTextArea setOpaque(false);銆銆銆銆 jTextArea setText( This puter program is protected by right law );銆銆銆銆 jTextArea setWrapstyleWord(true);銆銆銆銆 jTextArea setBounds( );銆銆銆銆 panel add(jTextArea );銆銆銆銆 getContentPane() add(panel Card );銆銆銆銆 setSize( );銆銆銆銆 button addActionListener(new ActionListener() {銆銆銆銆銆銆銆銆 public void actionPerformed(ActionEvent actionevent)銆銆銆銆銆銆 {銆銆銆銆銆銆銆銆 button _actionPerformed(actio lishixin/Article/program/Java/JSP/201311/19213

2. java代碼混淆方式

Java代碼混淆方式主要包括以下幾種：

1. 對.class文件進行加密：

   • 核心思想：通過加密技術保護.class文件內容，防止直接訪問和理解。
   • 優點：提供較高的安全性。
   • 缺點：實施復雜，需要自定義classloader來解密，增加了開發和維護成本。

2. 使用花指令：

   • 核心思想：在代碼中插入無意義的或難以理解的指令，以增加反編譯的難度。
   • 優點：操作相對簡單，能在一定程度上防止反編譯。
   • 缺點：安全性相對較低，存在針對特定花指令的破解工具。

3. 直接混淆代碼：

   • 核心思想：通過重命名類、方法、變數等，以及改變代碼結構，提升代碼的閱讀難度。
   • 優點：操作相對簡單，是最常見的代碼保護手段。
   • 缺點：雖然能增加代碼理解的難度，但無法完全防止逆向工程。

在實際應用中，通常會結合多種混淆方式來增強代碼保護的效果。同時，也需要注意混淆可能對代碼性能和執行效率帶來的影響，以及混淆後可能出現的調試和測試難度增加等問題。