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