现在企业中用java作为开发语言的越来越多，但是代码的安全问题也很严重，对java的代码保护最常用的策略是对代码进行混淆编译，有很多工具可以供大家选择。

Author/CompanyProgramShrinkingObfuscationLicense

Eric Lafortune	ProGuard			Free (GPL)
Jochen Hoenicke	Jode			Free (GPL)
Hidetoshi Ohuchi	Jarg			Free (BSD)
NQ4	Joga			Free (no source)
Alexander Shvets	CafeBabe			Free
Nate Nystrom	Bloat			Free
RiggsHill Software	GenJar			Free (Apache)
RetroLogic	RetroGuard			Free (LGPL)
Thorsten Heit	JavaGuard			Free (LGPL)
Patrick Mueller	Mwobfu			Free (GPL)
Bajie	JCMP			Free
yWorks	yGuard			Free
Dr. Java	Marvin Obfuscator			Free (no source)
IBM AlphaWorks	JAX			Commercial
PreEmptive	DashOPro			Commercial
Zelix	KlassMaster			Commercial
S5 Systems	jPresto			Commercial
CodingArt	CodeShield			Commercial
Plumb Design	Condensity			Commercial
Eastridge Technology	Jshrink			Commercial
Helseth	JObfuscator			Commercial
LeeSoftware	Smokescreen Obfuscator			Commercial
Vega Technologies	JZipper			Commercial
Sergey Sverdlov	J.Class Optimizer			Commercial