proguard混淆jar文件

Proguard是个优秀的java混淆工具，使用示例如下，一个java工程对外接口代码如下（无需混淆）

package com.ciaos.open;

import com.ciaos.inner.InnerTool;

public class OpenTool {
    public static void method()
    {
        System.out.println("public method");
        InnerTool.method();
    }
}

内部调用函数如下（需要混淆）

package com.ciaos.inner;

public class InnerTool {
    public static void method()
    {
        System.out.println("need encrypt");
    }
}

我们只想在打包的jar文件中保留OpenTool.method接口，则proguard配置文件library.pro文件如下：

#
# This ProGuard configuration file illustrates how to process a program
# library, such that it remains usable as a library.
# Usage:
#     java -jar proguard.jar @library.pro
#

# Specify the input jars, output jars, and library jars.
# In this case, the input jar is the program library that we want to process.

-injars  D:\libtool.jar
-outjars D:\libtool_min.jar

-libraryjars  C:\Users\shipeng\AppData\Local\MyEclipse Professional 2014\binary\com.sun.java.jdk7.win32.x86_1.7.0.u45\jre\lib\rt.jar
#-libraryjars  E:\Works\fastjson-1.1.34.android.jar

-printmapping map\proguard.map
-overloadaggressively
-defaultpackage ''
-allowaccessmodification
-dontoptimize
-overloadaggressively
-keepattributes InnerClasses,SourceFile,LineNumberTable,Signature
-optimizations !code/simplification/arithmetic,!field/*,!class/merging/*
-optimizationpasses 5
-keepattributes Exceptions
-keep public class com.ciaos.open.OpenTool
{
public *;
}
#-keep public class com.ciaos.inner.InnerTool
#{
#public *;
#}

混淆工具脚本

del "D:\libtool_min.jar"
java -jar lib/proguard.jar @library.pro
pause

更多用法参照Proguard官网，proguard也有插件集成到eclipse中。