python实现JAVA源代码从ANSI到UTF-8的批量转换方法

#-*- coding: utf-8 -*-
import codecs
import os
import shutil
import re
import chardet
def convert_encoding(filename,target_encoding):
 # Backup the origin file.
 shutil.copyfile(filename,filename + '.bak')
 # convert file from the source encoding to target encoding
 content = codecs.open(filename,'r').read()
 source_encoding = chardet.detect(content)['encoding']
 print source_encoding,filename
 content = content.decode(source_encoding) #.encode(source_encoding)
 codecs.open(filename,'w',encoding=target_encoding).write(content)
def main():
 for root,dirs,files in os.walk(os.getcwd()):
  for f in files:
   if f.lower().endswith('.java'):
    filename = os.path.join(root,f)
    try:
     convert_encoding(filename,'utf-8')
    except Exception,e:
     print filename
def process_bak_files(action='restore'):
 for root,files in os.walk(os.getcwd()):
  for f in files:
   if f.lower().endswith('.java.bak'):
    source = os.path.join(root,f)
    target = os.path.join(root,re.sub('.java.bak$','.java',f,flags=re.IGNORECASE))
    try:
     if action == 'restore':
      shutil.move(source,target)
     elif action == 'clear':
      os.remove(source)
    except Exception,e:
     print source
if __name__ == '__main__':
 # process_bak_files(action='clear')
 main()