java中那些已经有的好用轮子

后续补充

IOUtils

http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/IOUtils.html

FileUtils

http://commons.apache.org/proper/commons-io/apidocs/org/apache/commons/io/FileUtils.html

StringEscapeUtils

http://commons.apache.org/proper/commons-lang/javadocs/api-2.6/org/apache/commons/lang/StringEscapeUtils.html

mail

http://commons.apache.org/proper/commons-email/userguide.html