java

算天數

DateFormat df = new SimpleDateFormat("yyyyMMdd" );

Date start = df.parse(startDate );

Date end = df.parse(endDate );

debug("diff: " + (end.getTime() - start.getTime() )  );

long cnt = TimeUnit.MILLISECONDS.toDays(end.getTime() - start.getTime() ) + 1;

debug("cnt: " + cnt );

效能化查重複資料

BloomFilter bloomFilter = new BloomFilter(0.0000000001, 10000000);

//  判斷 UID 重覆

if(bloomFilter.contains(opUid.getUid() )  ) {

chkDup = false;

logger.info("UID 檔:{} 名單重覆-UID:{}", opUid.getActivity(), opUid.getUid() );

list = new ArrayList();

}

else {

bloomFilter.add(opUid.getUid() );

list.add(opd );

}

字元中文判斷

public static boolean isChinese(char c ) {

boolean result = false;

Character.UnicodeBlock ub = Character.UnicodeBlock.of(c );

if(ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS

|| ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS

|| ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A

|| ub == Character.UnicodeBlock.GENERAL_PUNCTUATION

|| ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION

|| ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS || c == '') {

result = true;

}

return result;

}

檢查 email

String EMAIL_PATTERN = "^[_A-Za-z0-9-]+(\\.[_A-Za-z0-9-]+)*@[_A-Za-z0-9\\_\\-]+(\\.[A-Za-z0-9\\_\\-]+)*(\\.[A-Za-z]{2,})$";

Pattern pattern = Pattern.compile(EMAIL_PATTERN );

Matcher matcher;

if(getMail_1().trim().equals("" )  ) {  //  無檔案接收者

err.append("檔案接收者EMail未填\n" );

}

else {

matcher = pattern.matcher(getMail_1().trim() );

if(!matcher.matches() ) {

err.append("檔案接收者EMail格式錯誤\n" );

}

}

java file 找出所有 *RSN* 的檔案

使用 WildcardFileFilter

FileUtils.listFiles(directory, new WildcardFileFilter("*RSN*.txt"), null );