命令：
C:Program FilesJavaJDK1.7jdk1.7.0_67in>jad -o -8 -r -dD:/output2/src -sjava D:companycodeabcWEB-INFclassescomsendinfo***.class
解释：
1.**表示sendinfo文件夹下的所有文件，不限层级的文件夹，有多少层就扫描多少层。*.class表示所有class后缀的文件。
sendinfo***.class
2.jad -o -8 -r -dXXXXX -sjava XXXXX
-o: 覆盖写，如果文件已经存在，则覆盖
-r: 建立和java包一致的文件夹路径
-dXXXX: 反编译后保存路径，如 D：/output/src
-sjava: 反编译后的文件后缀名，我们希望是.java文件
-8： 避免反编译时将中文编译为unicode，必不可少。
注意：路径中不要有中文，否则会出现错误，JavaClassFileReadException: can't open input file on `D:XXXXXX'
注意：会丢失注解 ，比如@XmlAttribute,@Autowired等等，全部缺失。表示很无赖
补充：
使用方法：
[1] 反编译一个class文件：jad example.class，会生成example.jad，用文本编辑器打开就是java源代码
[2] 指定生成源代码的后缀名：jad -sjava example.class，生成example.java
[3] 改变生成的源代码的名称，可以先使用-p将反编译后的源代码输出到控制台窗口，然后使用重定向，输出到文件：jad -p example.class > myexample.java
[4] 把源代码文件输出到指定的目录：jad -dnewdir -sjava example.class，在newdir目录下生成example.java
[5] 把packages目录下的class文件全部反编译：jad -sjava packages/*.class
[6] 把packages目录以及子目录下的文件全部反编译：jad -sjava packages/**/*.class，不过你仍然会发现所有的源代码文件被放到了同一个文件中，没有按照class文件的包路径建立起路径
[7] 把packages目录以及子目录下的文件全部反编译并建立和java包一致的文件夹路径，可以使用-r命令：jad -r -sjava packages/**/*.class
[8] 当重复使用命令反编译时，Jad会提示“whether you want to overwrite it or not”，使用-o可以强制覆盖旧文件
最权威的还是help：
bin>jad
Jad v1.5.8g. Copyright 2001 Pavel Kouznetsov (jad@kpdus.com).
Usage: jad [option(s)] <filename(s)>
Options: -a - generate JVM instructions as comments (annotate)
-af - output fully qualified names when annotating
-b - generate redundant braces (braces)
-clear - clear all prefixes, including the default ones
-d <dir> - directory for output files
-dead - try to decompile dead parts of code (if there are any)
-dis - disassembler only (disassembler)
-f - generate fully qualified names (fullnames)
-ff - output fields before methods (fieldsfirst)
-i - print default initializers for fields (definits)
-l<num> - split strings into pieces of max <num> chars (splitstr)
-lnc - output original line numbers as comments (lnc)
-lradix<num>- display long integers using the specified radix
-nl - split strings on newline characters (splitstr)
-noconv - don't convert Java identifiers into valid ones (noconv)
-nocast - don't generate auxiliary casts
-noclass - don't convert .class operators
-nocode - don't generate the source code for methods
-noctor - suppress the empty constructors
-nodos - turn off check for class files written in DOS mode
-nofd - don't disambiguate fields with the same names (nofldis)
-noinner - turn off the support of inner classes
-nolvt - ignore Local Variable Table entries (nolvt)
-nonlb - don't insert a newline before opening brace (nonlb)
-o - overwrite output files without confirmation
-p - send all output to STDOUT (for piping)
-pa <pfx>- prefix for all packages in generated source files
-pc <pfx>- prefix for classes with numerical names (default: _cls)
-pe <pfx>- prefix for unused exception names (default: _ex)
-pf <pfx>- prefix for fields with numerical names (default: _fld)
-pi<num> - pack imports into one line using .* (packimports)
-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)
-pv<num> - pack fields with the same types into one line (packfields)
-r - restore package directory structure
-radix<num>- display integers using the specified radix (8, 10, or 16)
-s <ext> - output file extension (default: .jad)
-safe - generate additional casts to disambiguate methods/fields
-space - output space between keyword (if, while, etc) and expression
-stat - show the total number of processed classes/methods/fields
-t<num> - use <num> spaces for indentation (default: 4)
-t - use tabs instead of spaces for indentation
-v - show method names while decompiling
-8 - convert Unicode strings into ANSI strings (ansi)
-& - redirect STDERR to STDOUT