命令：
C:\Program Files\Java\JDK1.7\jdk1.7.0_67\bin>jad -o -8 -r -dD:/output2/src -sjava D:\companycode\abc\WEB-INF\classes\com\sendinfo\**\*.class
解釋：
1.\**\表示sendinfo文件夾下的所有文件，不限層級的文件夾，有多少層就掃描多少層。*.class表示所有class后綴的文件。
sendinfo\**\*.class
2.jad -o -8 -r -dXXXXX -sjava XXXXX
-o: 覆蓋寫，如果文件已經存在，則覆蓋
-r: 建立和java包一致的文件夾路徑
-dXXXX: 反編譯后保存路徑，如 D：/output/src
-sjava: 反編譯后的文件后綴名，我們希望是.java文件
-8： 避免反編譯時將中文編譯為unicode，必不可少。
注意：路徑中不要有中文，否則會出現錯誤，JavaClassFileReadException: can't open input file on `D:\XXXXXX'
注意：會丟失注解 ，比如@XmlAttribute,@Autowired等等，全部缺失。表示很無賴
補充：
使用方法：
[1] 反編譯一個class文件：jad example.class，會生成example.jad，用文本編輯器打開就是java源代碼
[2] 指定生成源代碼的后綴名：jad -sjava example.class，生成example.java
[3] 改變生成的源代碼的名稱，可以先使用-p將反編譯后的源代碼輸出到控制台窗口，然后使用重定向，輸出到文件：jad -p example.class > myexample.java
[4] 把源代碼文件輸出到指定的目錄：jad -dnewdir -sjava example.class，在newdir目錄下生成example.java
[5] 把packages目錄下的class文件全部反編譯：jad -sjava packages/*.class
[6] 把packages目錄以及子目錄下的文件全部反編譯：jad -sjava packages/**/*.class，不過你仍然會發現所有的源代碼文件被放到了同一個文件中，沒有按照class文件的包路徑建立起路徑
[7] 把packages目錄以及子目錄下的文件全部反編譯並建立和java包一致的文件夾路徑，可以使用-r命令：jad -r -sjava packages/**/*.class
[8] 當重復使用命令反編譯時，Jad會提示“whether you want to overwrite it or not”，使用-o可以強制覆蓋舊文件
最權威的還是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