Procyon

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  • mstrobel / Procyon — Bitbucket

Luyten vs Procyon

从jar包导出代码：

• Luyten
  • 带GUI图形界面：可直接查看代码
  • 也可用来Save all导出全部代码
    • 但是速度比较慢
      • 当代码很大时：几十分钟还没导出完毕
• Procyon
  • 不带界面，只是一个jar包：
    • procyon-decompiler-0.5.34.jar
  • 可直接用来从你的jar包导出源码
    • 当代码很大时：速度很快，1分钟左右即可搞定

用Procyon从jar导出java源码

下面介绍用Procyon作为命令行工具去导出一个jar包文件为java源代码的过程：

下载Procyon的jar包

比如 procyon-decompiler-0.5.34.jar

用procyon的jar包从你的jar包转换出java代码

语法：

java -jar /path/to/procyon-decompiler-0.5.34.jar -jar your_to_decompile.jar -o outputFolderName

举例：

java -jar  /Users/crifan/dev/dev_tool/android/reverse_engineering/Procyon/procyon-decompiler-0.5.34.jar -jar com.huili.readingclub8825612-dex2jar.jar -o com.huili.readingclub8825612

java -jar  /Users/crifan/dev/dev_tool/android/reverse_engineering/Procyon/procyon-decompiler-0.5.36.jar -jar ../../dex_to_jar/com.ishowedu.child.peiyin8392664-dex2jar.jar -o com.ishowedu.child.peiyin8392664_java

基于Procyon的Luyten中的菜单中参数是来自procyon-decompiler命令行的参数

从procyon-decompiler的help帮助信息是：

procyon-decompiler -?
Usage: <main class> [options] <type names or class/jar files>
  Options:
    -b, --bytecode-ast
       Output Bytecode AST instead of Java.
       Default: false
    -ci, --collapse-imports
       Collapse multiple imports from the same package into a single wildcard
       import.
       Default: false
    -cp, --constant-pool
       Includes the constant pool when displaying raw bytecode (unnecessary with
       -v).
       Default: false
    -dl, --debug-line-numbers
       For debugging, show Java line numbers as inline comments (implies -ln;
       requires -o).
       Default: false
        --disable-foreach
       Disable 'for each' loop transforms.
       Default: false
    -eml, --eager-method-loading
       Enable eager loading of method bodies (may speed up decompilation of
       larger archives).
       Default: false
    -ent, --exclude-nested
       Exclude nested types when decompiling their enclosing types.
       Default: false
    -ei, --explicit-imports
       [DEPRECATED] Explicit imports are now enabled by default.  This option
       will be removed in a future release.
       Default: false
    -eta, --explicit-type-arguments
       Always print type arguments to generic methods.
       Default: false
    -fsb, --flatten-switch-blocks
       Drop the braces statements around switch sections when possible.
       Default: false
    -fq, --force-qualified-references
       Force fully qualified type and member references in Java output.
       Default: false
    -?, --help
       Display this usage information and exit.
       Default: false
    -jar, --jar-file
       [DEPRECATED] Decompile all classes in the specified jar file (disables
       -ent and -s).
    -lc, --light
       Use a color scheme designed for consoles with light background colors.
       Default: false
    -lv, --local-variables
       Includes the local variable tables when displaying raw bytecode
       (unnecessary with -v).
       Default: false
    -ll, --log-level
       Set the level of log verbosity (0-3).  Level 0 disables logging.
       Default: 0
    -mv, --merge-variables
       Attempt to merge as many variables as possible.  This may lead to fewer
       declarations, but at the expense of inlining and useful naming.  This feature is
       experimental and may be removed or become the standard behavior in future releases.
       Default: false
    -o, --output-directory
       Write decompiled results to specified directory instead of the console.
    -r, --raw-bytecode
       Output Raw Bytecode instead of Java (to control the level of detail, see:
       -cp, -lv, -ta, -v).
       Default: false
    -ec, --retain-explicit-casts
       Do not remove redundant explicit casts.
       Default: false
    -ps, --retain-pointless-switches
       Do not lift the contents of switches having only a default label.
       Default: false
    -ss, --show-synthetic
       Show synthetic (compiler-generated) members.
       Default: false
    -sm, --simplify-member-references
       Simplify type-qualified member references in Java output [EXPERIMENTAL].
       Default: false
    -sl, --stretch-lines
       Stretch Java lines to match original line numbers (only in combination
       with -o) [EXPERIMENTAL].
       Default: false
    -ta, --type-attributes
       Includes type attributes when displaying raw bytecode (unnecessary with
       -v).
       Default: false
        --unicode
       Enable Unicode output (printable non-ASCII characters will not be
       escaped).
       Default: false
    -u, --unoptimized
       Show unoptimized code (only in combination with -b).
       Default: false
    -v, --verbose
       Includes more detailed output depending on the output language (currently
       only supported for raw bytecode).
       Default: false
        --version
       Display the decompiler version and exit.
       Default: false
    -ln, --with-line-numbers
       Include line numbers in raw bytecode mode; supports Java mode with -o
       only.
       Default: false

从这些支持的参数中，可以推断：

基于Procyon的Luyten中的菜单中的选项，都是对应着这些参数的。

比如：Settings -> Flatten Switch Blocks

对应着此处参数--flatten-switch-blocks：

    -fsb, --flatten-switch-blocks
       Drop the braces statements around switch sections when possible.
       Default: false

其他以此类推，都是一样的逻辑：把命令行工具的参数，用菜单选项的形式展示和支持出来了。