Java 动态代理类如何查看字节码 - V2EX
CharlesOfBit
V2EX    Java

Java 动态代理类如何查看字节码

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  •   CharlesOfBit Jun 14, 2020 4115 views
    This topic created in 2162 days ago, the information mentioned may be changed or developed.

    请教各位,对于 java 中动态代理生成的类( Cglib,Javassist,ASM ),如何去查看对应的字节码或者源码?

    我目前的方法是去看动态代理类的生成过程,但是这种方式效率非常低,在网上也没搜索到好的办法,期待大佬们的指点。

    7 replies    2020-06-15 11:52:51 +08:00
    CDuXZMAPgHp1q9ew
        1
    CDuXZMAPgHp1q9ew  
       Jun 14, 2020
    用 arthas 去看下 runtime 的 class?
    BBCCBB
        2
    BBCCBB  
       Jun 14, 2020
    Asm 库的 TraceClassVisitor 应该可以实现这种效果
    CharlesOfBit
        3
    CharlesOfBit  
    OP
       Jun 14, 2020
    给大佬点赞,刚试了下,真的很好用
    cweijan
        4
    cweijan  
       Jun 15, 2020
    有趣的问题, 刚才试了一下, 发现是可行的, 步骤:
    1. 在 ClassLoader#defineClass 打条件断点(根据名称)
    2. new FileOutputStream("D://test.class").write(b), 将字节流输出到磁盘
    3. 用 IDEA(或其他)打开 class 文件
    monkeyWie
        5
    monkeyWie  
       Jun 15, 2020
    cweijan
        6
    cweijan  
       Jun 15, 2020
    @monkeyWie 哎呀, 老哥竟然是 proxyee-down 的作者
    monkeyWie
        7
    monkeyWie  
       Jun 15, 2020
    @cweijan 惭愧惭愧,已经更不动了
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