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cglibdemo's Introduction

cglibDemo

cglib插桩实现是基于ASM

  • github地址: https://github.com/cglib/cglib
  • 在内存中动态生成类
  • cglib底层采用ASM字节码生成框架,使用字节码技术生成代理类,也就是生成的.class文件,而我们在android中加载的是优化后的.dex文件,也就是说我们需要可以动态生成.dex文件代理类,cglib在android中是不能使用的
  • 可以使用dexmaker框架来仿照动态生成.dex文件,实现cglib的动态代理功能

cglib学习文档:

与JDK Proxy写法很像

JDK动态代理:其代理对象必须是某个接口的实现,它是通过在运行期期间创建一个接口的实现类来完成对目标对象的代理。
CGLIB代理:实现原理类似于JDK动态代理,只是它在运行期间生成的代理对象是针对目标类扩展的子类。CGLIB是高效的代码生成包,底层依靠ASM(开源的Java字节码编辑类库)操作字节码实现。
在内存中动态生成类

基于dexMaker实现cglib的参考demo

CGLib-for-Android原理

dexMaker会在沙盒里创建一个app_dexfiles文件夹,存放dex文件,然后使用双亲委派方式加载类
dexMaker github地址:https://github.com/linkedin/dexmaker

cglib-for-android实现分析截图

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cglib生成的代码位置

沙盒data/data/包名/app_dexfiles下

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mdlibrary实现分析截图

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