1，Spring 屬性拷貝BeanUtils
package gx.springboot.schedule.common.util; import org.springframework.beans.BeanUtils; import org.springframework.util.CollectionUtils; import java.util.ArrayList; import java.util.List; public class CopyUtil { public static <T> T copy(Object source, Class<T> c) { if (source == null) { return null; } try { T instance = c.newInstance(); BeanUtils.copyProperties(source, instance); return instance; } catch (Exception e) { e.printStackTrace(); return null; } } public static <E, T> List<T> copyList(List<E> sources, Class<T> c) { if (CollectionUtils.isEmpty(sources)) { return new ArrayList<T>(); } List<T> list = new ArrayList<T>(); for (E source : sources) { list.add(copy(source, c)); } return list; } }
2，BigDecimal 保留小數位
package com.gx.util; import org.apache.commons.lang3.StringUtils; import java.math.BigDecimal; public abstract class ChiticDigitUtil { public static BigDecimal toScale(String data, int scale) { if (StringUtils.isBlank(data)) { data = "0"; } BigDecimal bigDecimal = new BigDecimal(data); return bigDecimal.setScale(scale, BigDecimal.ROUND_HALF_UP); } public static BigDecimal toScale(BigDecimal data, int scale) { if (null == data) { data = BigDecimal.ZERO; } BigDecimal bigDecimal = data; return bigDecimal.setScale(scale, BigDecimal.ROUND_HALF_UP); } public static BigDecimal toScale(Double data, int scale) { if (null == data) { data = 0D; } BigDecimal bigDecimal = BigDecimal.valueOf(data); return bigDecimal.setScale(scale, BigDecimal.ROUND_HALF_UP); } public static BigDecimal toScale(Float data, int scale) { if (null == data) { data = 0F; } BigDecimal bigDecimal = BigDecimal.valueOf(data); return bigDecimal.setScale(scale, BigDecimal.ROUND_HALF_UP); } } 除法 BigDecimal bigDecimal = BigDecimal.valueOf(a).multiply(BigDecimal.valueOf(100)).divide(BigDecimal.valueOf(b), 2, BigDecimal.ROUND_HALF_UP);
3，Spring應用上下文環境
package com.gx.util; import org.springframework.beans.BeansException; import org.springframework.beans.factory.NoSuchBeanDefinitionException; import org.springframework.beans.factory.config.BeanFactoryPostProcessor; import org.springframework.beans.factory.config.ConfigurableListableBeanFactory; import org.springframework.stereotype.Component; @SuppressWarnings("unchecked") @Component public class SpringUtils implements BeanFactoryPostProcessor { private static ConfigurableListableBeanFactory beanFactory; // Spring應用上下文環境 @Override public void postProcessBeanFactory(ConfigurableListableBeanFactory beanFactory) throws BeansException { SpringUtils.beanFactory = beanFactory; } /** * 獲取對象 * * @param name * @return Object 一個以所給名字注冊的bean的實例 * @throws BeansException * */ @SuppressWarnings("unchecked") public static <T> T getBean(String name) throws BeansException { //首字母默認小寫 name=lowerCaseInit(name); if (containsBean(name)) { return (T) beanFactory.getBean(name); }else{ return null; } } /** * 獲取類型為requiredType的對象 * * @param clz * @return * @throws BeansException * */ public static <T> T getBean(Class<T> clz) throws BeansException { @SuppressWarnings("unchecked") T result = (T) beanFactory.getBean(clz); return result; } /** * 如果BeanFactory包含一個與所給名稱匹配的bean定義，則返回true * * @param name * @return boolean */ public static boolean containsBean(String name) { return beanFactory.containsBean(name); } /** * 判斷以給定名字注冊的bean定義是一個singleton還是一個prototype。 * 如果與給定名字相應的bean定義沒有被找到，將會拋出一個異常（NoSuchBeanDefinitionException） * * @param name * @return boolean * @throws NoSuchBeanDefinitionException * */ public static boolean isSingleton(String name) throws NoSuchBeanDefinitionException { return beanFactory.isSingleton(name); } /** * @param name * @return Class 注冊對象的類型 * @throws NoSuchBeanDefinitionException * */ public static Class<?> getType(String name) throws NoSuchBeanDefinitionException { return beanFactory.getType(name); } /** * 如果給定的bean名字在bean定義中有別名，則返回這些別名 * * @param name * @return * @throws NoSuchBeanDefinitionException * */ public static String[] getAliases(String name) throws NoSuchBeanDefinitionException { return beanFactory.getAliases(name); } /** *首字母小寫 * @return: 小寫的首字母 */ private static String lowerCaseInit(String str) { if (str.length()>0) { char c = str.charAt(0); if (c >= 65 && c <= 90) { int i = c + 32; return ((char)i)+str.substring(1); }else{ return str; } }else{ return null; } } }
4，生成UUID twitter的snowflake算法 -- java實現
package bdc.util; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; /** * twitter的snowflake算法 -- java實現 */ public class SnowFlake { /** * 起始的時間戳 * * 某個時間點相對1970-01-01的毫秒數 */ private final static long START_STMP = 1501516800000L; /** * 每一部分占用的位數 */ private final static long SEQUENCE_BIT = 12; // 序列號占用的位數 private final static long MACHINE_BIT = 5; // 機器標識占用的位數 private final static long DATACENTER_BIT = 5;// 數據中心占用的位數 /** * 每一部分的最大值 * * -1L^(-1L<<n)表示n個bit的數字最大值 相關知識 異或 位移 原碼 反碼 補碼 */ private final static long MAX_DATACENTER_NUM = -1L ^ (-1L << DATACENTER_BIT); private final static long MAX_MACHINE_NUM = -1L ^ (-1L << MACHINE_BIT); private final static long MAX_SEQUENCE = -1L ^ (-1L << SEQUENCE_BIT); /** * 每一部分向左的位移 */ private final static long MACHINE_LEFT = SEQUENCE_BIT; private final static long DATACENTER_LEFT = SEQUENCE_BIT + MACHINE_BIT; private final static long TIMESTMP_LEFT = DATACENTER_LEFT + DATACENTER_BIT; private long datacenterId; // 數據中心 private long machineId; // 機器標識 private long sequence = 0L; // 序列號 private long lastStmp = -1L;// 上一次時間戳 public SnowFlake(long datacenterId, long machineId) { if (datacenterId > MAX_DATACENTER_NUM || datacenterId < 0) { throw new IllegalArgumentException("datacenterId can't be greater than MAX_DATACENTER_NUM or less than 0"); } if (machineId > MAX_MACHINE_NUM || machineId < 0) { throw new IllegalArgumentException("machineId can't be greater than MAX_MACHINE_NUM or less than 0"); } this.datacenterId = datacenterId; this.machineId = machineId; } /** * 產生下一個ID * * @return */ public synchronized long nextId() { long currStmp = getNewstmp(); if (currStmp < lastStmp) { throw new RuntimeException("Clock moved backwards. Refusing to generate id"); } if (currStmp == lastStmp) { // 相同毫秒內，序列號自增 sequence = (sequence + 1) & MAX_SEQUENCE; // 同一毫秒的序列數已經達到最大 if (sequence == 0L) { currStmp = getNextMill(); } } else { // 不同毫秒內，序列號置為0 sequence = 0L; } lastStmp = currStmp; return (currStmp - START_STMP) << TIMESTMP_LEFT // 時間戳部分 | datacenterId << DATACENTER_LEFT // 數據中心部分 | machineId << MACHINE_LEFT // 機器標識部分 | sequence; // 序列號部分 } private long getNextMill() { long mill = getNewstmp(); while (mill <= lastStmp) { mill = getNewstmp(); } return mill; } private long getNewstmp() { return System.currentTimeMillis(); } public static String getDate(long id, String pattern){ id = (id >> 22) + START_STMP; DateFormat format = new SimpleDateFormat(pattern); return format.format(new Date(id)); } public static void main(String[] args) { SnowFlake snowFlake = new SnowFlake(2, 3); long id = snowFlake.nextId(); long time = (id >> 22) + START_STMP; System.out.println(id); Date date = new Date(time); DateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS"); System.out.println(format.format(new Date(START_STMP))); System.out.println(format.format(date)); ; } }
5，MD5加密
package com.gx.util; //import required classes public class MD5 { private static MD5 md5 = null; static final int S11 = 7; static final int S12 = 12; static final int S13 = 17; static final int S14 = 22; static final int S21 = 5; static final int S22 = 9; static final int S23 = 14; static final int S24 = 20; static final int S31 = 4; static final int S32 = 11; static final int S33 = 16; static final int S34 = 23; static final int S41 = 6; static final int S42 = 10; static final int S43 = 15; static final int S44 = 21; static final byte PADDING[] = { -128, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; private long state[]; private long count[]; private byte buffer[]; public String digestHexStr; private byte digest[]; public static synchronized MD5 getInstance() { if (md5 == null) { md5 = new MD5(); } return md5; } public String getMD5ofStr(String s) { md5Init(); md5Update(s.getBytes(), s.length()); md5Final(); digestHexStr = ""; for (int i = 0; i < 16; i++) { digestHexStr += byteHEX(digest[i]); } return digestHexStr; } private MD5() { state = new long[4]; count = new long[2]; buffer = new byte[64]; digest = new byte[16]; md5Init(); } private void md5Init() { count[0] = 0L; count[1] = 0L; state[0] = 0x67452301L; state[1] = 0xefcdab89L; state[2] = 0x98badcfeL; state[3] = 0x10325476L; } private long F(long l, long l1, long l2) { return l & l1 | ~l & l2; } private long G(long l, long l1, long l2) { return l & l2 | l1 & ~l2; } private long H(long l, long l1, long l2) { return l ^ l1 ^ l2; } private long I(long l, long l1, long l2) { return l1 ^ (l | ~l2); } private long FF(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += F(l1, l2, l3) + l4 + l6; l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); l += l1; return l; } private long GG(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += G(l1, l2, l3) + l4 + l6; l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); l += l1; return l; } private long HH(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += H(l1, l2, l3) + l4 + l6; l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); l += l1; return l; } private long II(long l, long l1, long l2, long l3, long l4, long l5, long l6) { l += I(l1, l2, l3) + l4 + l6; l = (int) l << (int) l5 | (int) l >>> (int) (32L - l5); l += l1; return l; } private void md5Update(byte abyte0[], int i) { byte abyte1[] = new byte[64]; int k = (int) (count[0] >>> 3) & 0x3f; if ((count[0] += i << 3) < (long) (i << 3)) { count[1]++; } count[1] += i >>> 29; int l = 64 - k; int j; if (i >= l) { md5Memcpy(buffer, abyte0, k, 0, l); md5Transform(buffer); for (j = l; j + 63 < i; j += 64) { md5Memcpy(abyte1, abyte0, 0, j, 64); md5Transform(abyte1); } k = 0; } else { j = 0; } md5Memcpy(buffer, abyte0, k, j, i - j); } private void md5Final() { byte abyte0[] = new byte[8]; Encode(abyte0, count, 8); int i = (int) (count[0] >>> 3) & 0x3f; int j = i >= 56 ? 120 - i : 56 - i; md5Update(PADDING, j); md5Update(abyte0, 8); Encode(digest, state, 16); } private void md5Memcpy(byte abyte0[], byte abyte1[], int i, int j, int k) { for (int l = 0; l < k; l++) { abyte0[i + l] = abyte1[j + l]; } } private void md5Transform(byte abyte0[]) { long l = state[0]; long l1 = state[1]; long l2 = state[2]; long l3 = state[3]; long al[] = new long[16]; Decode(al, abyte0, 64); l = FF(l, l1, l2, l3, al[0], 7L, 0xd76aa478L); l3 = FF(l3, l, l1, l2, al[1], 12L, 0xe8c7b756L); l2 = FF(l2, l3, l, l1, al[2], 17L, 0x242070dbL); l1 = FF(l1, l2, l3, l, al[3], 22L, 0xc1bdceeeL); l = FF(l, l1, l2, l3, al[4], 7L, 0xf57c0fafL); l3 = FF(l3, l, l1, l2, al[5], 12L, 0x4787c62aL); l2 = FF(l2, l3, l, l1, al[6], 17L, 0xa8304613L); l1 = FF(l1, l2, l3, l, al[7], 22L, 0xfd469501L); l = FF(l, l1, l2, l3, al[8], 7L, 0x698098d8L); l3 = FF(l3, l, l1, l2, al[9], 12L, 0x8b44f7afL); l2 = FF(l2, l3, l, l1, al[10], 17L, 0xffff5bb1L); l1 = FF(l1, l2, l3, l, al[11], 22L, 0x895cd7beL); l = FF(l, l1, l2, l3, al[12], 7L, 0x6b901122L); l3 = FF(l3, l, l1, l2, al[13], 12L, 0xfd987193L); l2 = FF(l2, l3, l, l1, al[14], 17L, 0xa679438eL); l1 = FF(l1, l2, l3, l, al[15], 22L, 0x49b40821L); l = GG(l, l1, l2, l3, al[1], 5L, 0xf61e2562L); l3 = GG(l3, l, l1, l2, al[6], 9L, 0xc040b340L); l2 = GG(l2, l3, l, l1, al[11], 14L, 0x265e5a51L); l1 = GG(l1, l2, l3, l, al[0], 20L, 0xe9b6c7aaL); l = GG(l, l1, l2, l3, al[5], 5L, 0xd62f105dL); l3 = GG(l3, l, l1, l2, al[10], 9L, 0x2441453L); l2 = GG(l2, l3, l, l1, al[15], 14L, 0xd8a1e681L); l1 = GG(l1, l2, l3, l, al[4], 20L, 0xe7d3fbc8L); l = GG(l, l1, l2, l3, al[9], 5L, 0x21e1cde6L); l3 = GG(l3, l, l1, l2, al[14], 9L, 0xc33707d6L); l2 = GG(l2, l3, l, l1, al[3], 14L, 0xf4d50d87L); l1 = GG(l1, l2, l3, l, al[8], 20L, 0x455a14edL); l = GG(l, l1, l2, l3, al[13], 5L, 0xa9e3e905L); l3 = GG(l3, l, l1, l2, al[2], 9L, 0xfcefa3f8L); l2 = GG(l2, l3, l, l1, al[7], 14L, 0x676f02d9L); l1 = GG(l1, l2, l3, l, al[12], 20L, 0x8d2a4c8aL); l = HH(l, l1, l2, l3, al[5], 4L, 0xfffa3942L); l3 = HH(l3, l, l1, l2, al[8], 11L, 0x8771f681L); l2 = HH(l2, l3, l, l1, al[11], 16L, 0x6d9d6122L); l1 = HH(l1, l2, l3, l, al[14], 23L, 0xfde5380cL); l = HH(l, l1, l2, l3, al[1], 4L, 0xa4beea44L); l3 = HH(l3, l, l1, l2, al[4], 11L, 0x4bdecfa9L); l2 = HH(l2, l3, l, l1, al[7], 16L, 0xf6bb4b60L); l1 = HH(l1, l2, l3, l, al[10], 23L, 0xbebfbc70L); l = HH(l, l1, l2, l3, al[13], 4L, 0x289b7ec6L); l3 = HH(l3, l, l1, l2, al[0], 11L, 0xeaa127faL); l2 = HH(l2, l3, l, l1, al[3], 16L, 0xd4ef3085L); l1 = HH(l1, l2, l3, l, al[6], 23L, 0x4881d05L); l = HH(l, l1, l2, l3, al[9], 4L, 0xd9d4d039L); l3 = HH(l3, l, l1, l2, al[12], 11L, 0xe6db99e5L); l2 = HH(l2, l3, l, l1, al[15], 16L, 0x1fa27cf8L); l1 = HH(l1, l2, l3, l, al[2], 23L, 0xc4ac5665L); l = II(l, l1, l2, l3, al[0], 6L, 0xf4292244L); l3 = II(l3, l, l1, l2, al[7], 10L, 0x432aff97L); l2 = II(l2, l3, l, l1, al[14], 15L, 0xab9423a7L); l1 = II(l1, l2, l3, l, al[5], 21L, 0xfc93a039L); l = II(l, l1, l2, l3, al[12], 6L, 0x655b59c3L); l3 = II(l3, l, l1, l2, al[3], 10L, 0x8f0ccc92L); l2 = II(l2, l3, l, l1, al[10], 15L, 0xffeff47dL); l1 = II(l1, l2, l3, l, al[1], 21L, 0x85845dd1L); l = II(l, l1, l2, l3, al[8], 6L, 0x6fa87e4fL); l3 = II(l3, l, l1, l2, al[15], 10L, 0xfe2ce6e0L); l2 = II(l2, l3, l, l1, al[6], 15L, 0xa3014314L); l1 = II(l1, l2, l3, l, al[13], 21L, 0x4e0811a1L); l = II(l, l1, l2, l3, al[4], 6L, 0xf7537e82L); l3 = II(l3, l, l1, l2, al[11], 10L, 0xbd3af235L); l2 = II(l2, l3, l, l1, al[2], 15L, 0x2ad7d2bbL); l1 = II(l1, l2, l3, l, al[9], 21L, 0xeb86d391L); state[0] += l; state[1] += l1; state[2] += l2; state[3] += l3; } private void Encode(byte abyte0[], long al[], int i) { int j = 0; for (int k = 0; k < i; k += 4) { abyte0[k] = (byte) (int) (al[j] & 255L); abyte0[k + 1] = (byte) (int) (al[j] >>> 8 & 255L); abyte0[k + 2] = (byte) (int) (al[j] >>> 16 & 255L); abyte0[k + 3] = (byte) (int) (al[j] >>> 24 & 255L); j++; } } private void Decode(long al[], byte abyte0[], int i) { int j = 0; for (int k = 0; k < i; k += 4) { al[j] = b2iu(abyte0[k]) | b2iu(abyte0[k + 1]) << 8 | b2iu(abyte0[k + 2]) << 16 | b2iu(abyte0[k + 3]) << 24; j++; } } public static long b2iu(byte byte0) { return byte0 >= 0 ? byte0 : byte0 & 0xff; } public static String byteHEX(byte byte0) { char ac[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' }; char ac1[] = new char[2]; ac1[0] = ac[byte0 >>> 4 & 0xf]; ac1[1] = ac[byte0 & 0xf]; String s = new String(ac1); return s; } public static String getMD5Str(String string) { return getInstance().getMD5ofStr(string); } }
使用:
MD5.getMD5Str("admin")
6，StringUtils工具類
1. public static boolean isEmpty(String str) 判斷某字符串是否為空，為空的標准是 str==null 或 str.length()==0 下面是 StringUtils 判斷是否為空的示例： StringUtils.isEmpty(null) = true StringUtils.isEmpty("") = true StringUtils.isEmpty(" ") = false //注意在 StringUtils 中空格作非空處理 StringUtils.isEmpty(" ") = false StringUtils.isEmpty("bob") = false StringUtils.isEmpty(" bob ") = false 2. public static boolean isNotEmpty(String str) 判斷某字符串是否非空，等於 !isEmpty(String str) 下面是示例： StringUtils.isNotEmpty(null) = false StringUtils.isNotEmpty("") = false StringUtils.isNotEmpty(" ") = true StringUtils.isNotEmpty(" ") = true StringUtils.isNotEmpty("bob") = true StringUtils.isNotEmpty(" bob ") = true 3. public static boolean isBlank(String str) 判斷某字符串是否為空或長度為0或由空白符(whitespace) 構成 下面是示例： StringUtils.isBlank(null) = true StringUtils.isBlank("") = true StringUtils.isBlank(" ") = true StringUtils.isBlank(" ") = true StringUtils.isBlank("\t \n \f \r") = true //對於制表符、換行符、換頁符和回車符 StringUtils.isBlank() //均識為空白符 StringUtils.isBlank("\b") = false //"\b"為單詞邊界符 StringUtils.isBlank("bob") = false StringUtils.isBlank(" bob ") = false 4. public static boolean isNotBlank(String str) 判斷某字符串是否不為空且長度不為0且不由空白符(whitespace) 構成，等於 !isBlank(String str) 下面是示例： StringUtils.isNotBlank(null) = false StringUtils.isNotBlank("") = false StringUtils.isNotBlank(" ") = false StringUtils.isNotBlank(" ") = false StringUtils.isNotBlank("\t \n \f \r") = false StringUtils.isNotBlank("\b") = true StringUtils.isNotBlank("bob") = true StringUtils.isNotBlank(" bob ") = true 5. public static String trim(String str) 去掉字符串兩端的控制符(control characters, char <= 32) , 如果輸入為 null 則返回null 下面是示例： StringUtils.trim(null) = null StringUtils.trim("") = "" StringUtils.trim(" ") = "" StringUtils.trim(" \b \t \n \f \r ") = "" StringUtils.trim(" \n\tss \b") = "ss" StringUtils.trim(" d d dd ") = "d d dd" StringUtils.trim("dd ") = "dd" StringUtils.trim(" dd ") = "dd" 6. public static String trimToNull(String str) 去掉字符串兩端的控制符(control characters, char <= 32) ,如果變為 null 或""，則返回 null 下面是示例： StringUtils.trimToNull(null) = null StringUtils.trimToNull("") = null StringUtils.trimToNull(" ") = null StringUtils.trimToNull(" \b \t \n \f \r ") = null StringUtils.trimToNull(" \n\tss \b") = "ss" StringUtils.trimToNull(" d d dd ") = "d d dd" StringUtils.trimToNull("dd ") = "dd" StringUtils.trimToNull(" dd ") = "dd" 7. public static String trimToEmpty(String str) 去掉字符串兩端的控制符(control characters, char <= 32) ,如果變為 null 或 "" ，則返回 "" 下面是示例： StringUtils.trimToEmpty(null) = "" StringUtils.trimToEmpty("") = "" StringUtils.trimToEmpty(" ") = "" StringUtils.trimToEmpty(" \b \t \n \f \r ") = "" StringUtils.trimToEmpty(" \n\tss \b") = "ss" StringUtils.trimToEmpty(" d d dd ") = "d d dd" StringUtils.trimToEmpty("dd ") = "dd" StringUtils.trimToEmpty(" dd ") = "dd" 8. public static String strip(String str) 去掉字符串兩端的空白符(whitespace) ，如果輸入為 null 則返回 null 下面是示例(注意和 trim() 的區別)： StringUtils.strip(null) = null StringUtils.strip("") = "" StringUtils.strip(" ") = "" StringUtils.strip(" \b \t \n \f \r ") = "\b" StringUtils.strip(" \n\tss \b") = "ss \b" StringUtils.strip(" d d dd ") = "d d dd" StringUtils.strip("dd ") = "dd" StringUtils.strip(" dd ") = "dd" 9. public static String stripToNull(String str) 去掉字符串兩端的空白符(whitespace) ，如果變為 null 或""，則返回 null 下面是示例(注意和 trimToNull() 的區別)： StringUtils.stripToNull(null) = null StringUtils.stripToNull("") = null StringUtils.stripToNull(" ") = null StringUtils.stripToNull(" \b \t \n \f \r ") = "\b" StringUtils.stripToNull(" \n\tss \b") = "ss \b" StringUtils.stripToNull(" d d dd ") = "d d dd" StringUtils.stripToNull("dd ") = "dd" StringUtils.stripToNull(" dd ") = "dd" 10. public static String stripToEmpty(String str) 去掉字符串兩端的空白符(whitespace) ，如果變為 null 或"" ，則返回"" 下面是示例(注意和 trimToEmpty() 的區別)： StringUtils.stripToNull(null) = "" StringUtils.stripToNull("") = "" StringUtils.stripToNull(" ") = "" StringUtils.stripToNull(" \b \t \n \f \r ") = "\b" StringUtils.stripToNull(" \n\tss \b") = "ss \b" StringUtils.stripToNull(" d d dd ") = "d d dd" StringUtils.stripToNull("dd ") = "dd" StringUtils.stripToNull(" dd ") = "dd"