寫這篇文章的目的只是想說明一個道理,很多事情真的要想清楚在動手。
一個很簡單的問題,把它想複雜了,會導致工作效率嚴重下降。
方法1:一開始想到的最笨的方法,是將郵件信息轉換爲字符串,然後
對字符串運用正則表達式對某些敏感信息進行處理。處理代碼如下,
String regMail = "\\w{1,15}[\\w-+=]{1,15}(\\.\\w{1,15}[\\w-+=]{1,15}){0,4}@[\\w-]{1,20}(\\.[\\w-]{1,20}){1,4}";
Pattern patternMail = Pattern.compile(regMail,Pattern.DOTALL);
String regFrom = "\r\nFrom:.+?\r\n";
Pattern patternFrom = Pattern.compile(regFrom, Pattern.DOTALL);
String regTo= "\r\nTo:.+?Subject$";
Pattern patternTo = Pattern.compile(regTo, Pattern.DOTALL);
in = new FileInputStream(mailpath);
String maildata = inputStream2String(in);
maildata = patternMail.matcher(maildata).replaceAll("[email protected]");
maildata = patternFrom.matcher(maildata).replaceAll("\r\nFrom:<[email protected]>\r\n");
maildata = patternTo.matcher(maildata).replaceAll("\r\nTo:<[email protected]>\r\n");
BufferedWriter writer = null;
try {
String file = "D:\\workspace\\mailonline\\MailProcess\\mail\\" + files[i].getName();
writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file, false),System.getProperty("file.encoding")));
writer.write(maildata);
}catch(Exception e){
e.printStackTrace();
}finally{
if (writer != null)
writer.close();
}
方法2: 使用javamail包裏面的MimeMessage類對郵件進行處理
in = new FileInputStream(files[i]);
MimeMessage message = new MimeMessage(null, in);
InternetAddress address;
address = new InternetAddress("[email protected]");//發送人
if(message.getRecipients(RecipientType.CC) != null)
message.setRecipient(RecipientType.CC, address);
message.setRecipient(RecipientType.TO, address);
if(message.getRecipients(RecipientType.BCC) != null)
message.setRecipient(RecipientType.BCC, address);
message.setFrom(address);
message.saveChanges();
String fileName = "D:\\workspace\\mailonline\\MailProcess\\mail\\"+System.currentTimeMillis() + ".eml";
FileOutputStream fos = null;
fos = new FileOutputStream(fileName);
message.writeTo(fos);
fos.close();
點評: 字符串操作格式化的郵件確實不是很好的辦法,特別是正則表達式的書寫比較複雜。
需要對正則表達式很好的掌握才能寫出滿足需求的表達式。方法2簡單直接,直接通過mimemessage
提供的接口修改郵件的格式化數據,然後保存到文件即可。