java，class文件批量反编译成class文件，免安装
官方文档
This is README file for Jad - the fast Java Decompiler. Jad home page: http://www.kpdus.com/jad.html Copyright 2001 Pavel Kouznetsov (jad@kpdus.com). 0. Please read the disclaimer on the Jad home page. 1. Installation. Unzip jad.zip file into any appropriate directory on your hard drive. This will create two files: - an executable file named 'jad.exe' (Windows *) or 'jad' (*n*x) - this README file No other setup is required. 2. How to use Jad To decompile a single JAVA class file 'example1.class' type the following: jad example1.class This command creates file 'example1.jad' in the current directory. If such file already exists Jad asks whether you want to overwrite it or not. Option -o permits overwriting without a confirmation. You can omit .class extension and/or use wildcards in the names of input files. Option -s <ext> allows to change output file extension: jad -sjava example1.class This command creates file 'example1.java'. Be careful when using options -o and -sjava together, because Jad can accidentally overwrite your own source files. Jad uses JAVA class name as an output file name. For example, if class file 'example1.class' contains JAVA class 'test1' then Jad will create file 'test1.jad' rather than 'example1.jad'. If you want to specify your own output file name use the output redirection: jad -p example1.class > myexm1.java Option -d allows you to specify another directory for output files, which are created, by default, in the current directory. For example: jad -o -dtest -sjava *.class (or jad -o -d test -s java *.class, which has the same effect) This command decompiles all .class files in the current directory and places all output files with extension .java into directory 'test'. If you want to decompile the whole tree of JAVA classes, use the following command: jad -o -r -sjava -dsrc tree/**/*.class This command decompiles all .class files located in all subdirectories of 'tree' and creates output files in subdirectories of 'src' according to package names of classes. For example, if file 'tree/a/b/c.class' contains class 'c' from package 'a.b', then output file will have a name 'src/a/b/c.java'. Note the use of the "two stars" wildcard ('**') in the previous command. It is handled by Jad rather than the command shell, so on UNIX the last argument should be single-quoted: jad -o -r -sjava -dsrc 'tree/**/*.class' In a case you want to check the accuracy of the decompilation or just curious, there is an option -a which tells Jad to annotate the output with JAVA Virtual Machine bytecodes. Jad supports the inner and anonymous classes. When Jad expands wildcards in the input file names, it automatically skips matching inner classes. On UNIX Jad skips inner classes if there is more than one class specified in the command line. Jad looks for inner classes in the directory of their top-level container class. 3. List of the command-line options. Jad accepts the following options: -a - annotate the output with JVM bytecodes (default: off) -af - same as -a, but output fully qualified names when annotating -clear - clear all prefixes, including the default ones (can be abbreviated as -cl) -b - output redundant braces (e.g., if(a) { b(); }, default: off) -d <dir> - directory for output files (will be created when necessary) -dead - try to decompile dead parts of code (if any) (default: off) -disass - disassemble method bytecodes (no JAVA source generated) -f - output fully qualified names for classes/fields/methods (default: off) -ff - output class fields before methods (default: after methods) -i - output default initializers for all non-final fields -l<num> - split strings into pieces of maximum <num> chars (default: off) -lnc - annotate the output with line numbers (default: off) -lradix<num> - display long integers using the specified radix (8, 10 or 16) -nl - split strings on newline character (default: off) -nocast - don't generate auxiliary casts -nocode - don't generate the source code for methods -noconv - don't convert Java identifiers (default: convert) -noctor - suppress the empty constructors -nodos - do not check for class files written in DOS mode (CR before NL, default: check) -nofd - don't disambiguate fields with the same names by adding signatures to their names (default: do) -noinner - turn off the support of inner classes (default: on) -nolvt - ignore Local Variable Table information -nonlb - don't output a newline before opening brace (default: do) -o - overwrite output files without confirmation (default: off) -p - send decompiled code to STDOUT (e.g., for piping) -pi<num> - pack imports into one line after <num> imports (default: 3) -pv<num> - pack fields with identical types into one line (default: off) -pa <pfx>- prefix for all packages in generated source files -pc <pfx>- prefix for classes with numerical names (default: _cls) -pf <pfx>- prefix for fields with numerical names (default: _fld) -pe <pfx>- prefix for unused exception names (default: _ex) -pl <pfx>- prefix for locals with numerical names (default: _lcl) -pm <pfx>- prefix for methods with numerical names (default: _mth) -pp <pfx>- prefix for method parms with numerical names (default: _prm) -r - restore package directory structrure -radix<num> - display integers using the specified radix (8, 10 or 16) -s <ext> - output file extension (by default '.jad') -safe - generate additional casts to disambiguate methods/fields (default: off) -space - output space between keyword (if/for/while/etc) and expression (default: off) -stat - display the total number of processed classes/methods/fields -t - use tabs instead of spaces for indentation -t<num> - use <num> spaces for indentation (default: 4) -v - display method names being decompiled -8 - convert UNICODE strings into 8-bit strings using the current ANSI code page (Win32 only) -& - redirect STDERR to STDOUT (Win32 only) All single-word options have three formats: -o - 'reverses' value of an option -o+ - set value to 'true' or 'on' -o- - set value to 'false' or 'off' You can specify the options you want to be set by default in the environment variable JAD_OPTIONS. For example: JAD_OPTIONS=-ff+ -nonlb+ -t+ -space+
使用用例1，反编译单个文件：
jad example1.class
如下图所示，会生成一个*.jad的文件，如果是要生成java的话，用后续的代码
用例2
jad -sjava example1.class
生成一个*.java的文件
用例3，从命名一个文件名
jad -p example1.class > myexm1.java
用例4，可以批量转换某个目录下的所有.class的反编译成.java,并生成在test目录中
jad -o -dtest -sjava *.class
也可以用命令
jad -o -d test -s java *.class
用例5：
批量转换某个目录下的所有.class文件，并按src的目录进行存放反编译后java文件
jad -o -r -sjava -dsrc tree/**/*.class
若有一些特殊的通配符用下面的命令
jad -o -r -sjava -dsrc 'tree/**/*.class'
一些特殊的扩展参数
-a -用JVM字节码注释输出（默认值：关闭）
-af -与-a相同，但在注释时输出完全限定的名称
-clear --清除所有的前缀，包含一些默认的前缀
-b -输出冗余大括号（例如，如果（a）｛b（）；｝，默认值：关闭），试了下看不到效果，没看懂
-d＜dir＞ -输出文件的目录（将在必要时创建）
-dead - 尝试反编译部分无法反编译的代码，默认：关闭
-disass -反汇编方法字节码（未生成JAVA源代码）
-f - 为类/字段/方法输出完全限定的名称（默认值：关闭），就是引用外部类、方法/字段/方法 会输出全路径名称，比如一个String，那就是输出java.lang.String
-ff 字段输出在方法之前（默认：输出在方法之后）
-i - 为所有非final字段输出默认初始值设定项
-l＜num＞ -将字符串拆分为最大＜num＞个字符（默认值：关闭），不知道啥效果，看到看到有些字符串被拆分后换行了
-lnc -用行号注释输出（默认值：off）
-lradix＜num＞ -使用指定基数（8、10或16）显示长整数
-nl-换行符上的拆分字符串（默认值：off）
-nocast-不生成辅助强制转换
-nocode-不生成方法的源代码
-noconv-不转换Java标识符（默认值：convert）
-noctor-抑制空构造函数
-nodos-不检查在DOS模式下写入的类文件（在NL之前为CR，默认值：check）
-nofd-不要通过在名称中添加签名来消除同名字段的歧义（默认值：do）
-noinner-关闭对内部类的支持（默认值：打开）
-nolvt-忽略本地变量表信息
-nonlb-在打开大括号之前不输出换行符（默认值：do）
-o-在没有确认的情况下覆盖输出文件（默认值：关闭）
-p-将反编译代码发送到STDOUT（例如，用于管道）
-pi＜num＞-在＜num＞导入之后将导入打包到一行中（默认值：3）
-pv<num>-将具有相同类型的字段打包成一行（默认值：off）
-pa＜pfx＞-生成的源文件中所有包的前缀
-pc＜pfx＞-带有数字名称的类的前缀（默认值：cls）
-pf＜pfx＞-带有数字名称的字段的前缀（默认值：_fld）
-pe＜pfx＞-未使用的异常名称的前缀（默认值：_ex）
-pl＜pfx＞-带有数字名称的局部变量的前缀（默认值：_lcl）
-pm＜pfx＞-带有数字名称的方法的前缀（默认值：_mth）
-pp＜pfx＞-带有数字名称的方法参数的前缀（默认值：prm）
-r-还原包目录结构
-radix＜num＞-使用指定的基数（8、10或16）显示整数
-s<ext>-输出文件扩展名（默认为“.jad”）
-安全-生成其他强制转换以消除方法/字段的歧义（默认值：off）
-space-关键字（if/for/while/etc）和表达式（默认值：off）之间的输出空间
-stat-显示已处理的类/方法/字段的总数
-t-使用制表符而不是空格进行缩进
-t＜num＞-使用＜num＞空格进行缩进（默认值：4）
-v-正在反编译的显示方法名称
-8-将UNICODE字符串转换为8位字符串
使用当前ANSI代码页（仅Win32）
-&-将STDERR重定向到STDOUT（仅Win32）
下载链接
