本文实例讲述了Python删除Java源文件中全部注释的实现方法。分享给大家供大家参考，具体如下：
同事想删除一个Java项目中的全部注释，让我帮忙想想办法。
没找不到合适工具，就写了这个脚本，遍历指定目录，查找*.java文件，删除其中/* */之间，及// 至行末的内容。
（用之前要改改其中的路径）：
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#!D:\Python32
# 过滤JAVA程序中的注释
# 如果字符串中有注释符号的话会有问题。
import os
import re
import io
# 改这个目录！！！
top_dir = "E:\\java_comments_trim\\";
# 状态
S_INIT = 0;
S_SLASH = 1;
S_BLOCK_COMMENT = 2;
S_BLOCK_COMMENT_DOT = 3;
S_LINE_COMMENT = 4;
S_STR = 5;
S_STR_ESCAPE = 6;
def trim_dir(path):
print("目录：" + path);
for root, dirs, files in os.walk(path):
for name in files:
trim_file(os.path.join(root, name))
#for name in dirs:
#trim_dir(os.path.join(root, name))
def trim_file(path):
print("文件：" + path);
if re.match(".*java{1}quot;, path):
print(" 处理");
else:
print(" 忽略");
return;
bak_file = path + ".bak";
os.rename(path, bak_file);
fp_src = open(bak_file);
fp_dst = open(path, 'w');
state = S_INIT;
for line in fp_src.readlines():
for c in line:
if state == S_INIT:
if c == '/':
state = S_SLASH;
elif c == '"''"':
state = S_STR;
fp_dst.write(c);
else:
fp_dst.write(c);
elif state == S_SLASH:
if c == '*':
state = S_BLOCK_COMMENT;
elif c == '/':
state = S_LINE_COMMENT;
else:
fp_dst.write('/');
fp_dst.write(c);
elif state == S_BLOCK_COMMENT:
if c == '*':
state = S_BLOCK_COMMENT_DOT;
elif state == S_BLOCK_COMMENT_DOT:
if c == '/':
state = S_INIT;
else:
state = S_BLOCK_COMMENT;
elif state == S_LINE_COMMENT:
if c == '\n':
state = S_INIT;
elif state == S_STR:
if c == '\\':
state = S_STR_ESCAPE;
elif c == '"':
state = S_INIT;
fp_dst.write(c);
elif state == S_STR_ESCAPE:
# 这里未完全实现全部序列，如\oNNN \xHH \u1234 \U12345678，但没影响
state = S_STR;
fp_dst.write(c);
fp_src.close();
fp_dst.close();
trim_dir(top_dir);
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希望本文所述对大家Python程序设计有所帮助。
原文链接：http://blog.csdn.net/codearhat/article/details/6852483