自己造了一些轮子，由于水平有限，如有错误或缺陷（必定会有的），欢迎大家提出。

项目地址：全球同性交友网站

这里贴上部分工具类代码，完整代码可以点击上面的链接获取

字符串工具类 StringUtil：

1. MD5加密
2. 创建指定长度的随机字符串
3. 字符串和ASCII码互转
4. 字符串判空
...

package com.dengweiping.String;import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.util.Random;/*** @description:字符串工具类* @author: dengweiping* @time: 2020/6/1 8:47*/
public class StringUtil {/*** MD5加密 生成32位md5码** @param inStr 输入字符串* @return*/public static String toMD5(String inStr) {MessageDigest md5;try {md5 = MessageDigest.getInstance("MD5");} catch (Exception e) {e.printStackTrace();return null;}char[] charArray = inStr.toCharArray();byte[] byteArray = new byte[charArray.length];for (int i = 0; i < charArray.length; i++) {byteArray[i] = (byte) charArray[i];}byte[] md5Bytes = md5.digest(byteArray);StringBuffer hexValue = new StringBuffer();for (int i = 0; i < md5Bytes.length; i++) {int val = ((int) md5Bytes[i]) & 0xff;if (val < 16)hexValue.append("0");hexValue.append(Integer.toHexString(val));}return hexValue.toString();}/*** 根据指定字符串创建指定长度的随机码** @param strTable* @param length* @return*/private static String createRandomStr(String strTable, int length) {char[] strArr = strTable.toCharArray();Random random = new Random();StringBuffer result = new StringBuffer(length);for (int i = 0; i < length; i++) {int num = random.nextInt(strTable.length());result.append(strArr[num]);}return result.toString();}/*** 创建指定数量的随机字符串** @param length 指定长度* @return*/public static String createRandomStr(int length) {String strTable = "abcdefghijkmnpqrstuvwxyz";return createRandomStr(strTable, length);}/*** 创建指定数量的随机字符串** @param length 指定长度* @return*/public static String createRandomStrAndNum(int length) {String strTable = "1234567890abcdefghijkmnpqrstuvwxyz";return createRandomStr(strTable, length);}/*** 创建指定数量的随机数字** @param length 指定长度* @return*/public static String createRandomNum(int length) {String strTable = "1234567890";return createRandomStr(strTable, length);}/*** 字节数组转换为字符串** @param bytes 字节数组* @return*/public static String byteToStr(byte[] bytes) {String strRead = null;try {strRead = new String(bytes, "UTF-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}return strRead;}/*** 字符串转ASCII** @param str 字符串* @return*/public static int[] toASCII(String str) {byte[] bytes = str.getBytes();int[] result = new int[str.length()];for (int i = 0; i < bytes.length; i++) {result[i] = bytes[i];}return result;}/*** 字符转ASCII** @param c 字符* @return*/public static int toASCII(char c) {byte b = (byte) c;return b;}/*** ASCII转字符** @param ASCIINum ASCII码值* @return*/public static char ASCIIToChar(int ASCIINum) {char strChar = (char) ASCIINum;return strChar;}/*** ASCII转字符串** @param ASCIINum ASCII码值* @return*/public static String ASCIIToStr(int[] ASCIINum) {StringBuffer stringBuffer = new StringBuffer();for (int num : ASCIINum) {char strChar = (char) num;stringBuffer.append(strChar);}return stringBuffer.toString();}/*** 字符串判空** @param str* @return*/public static boolean isEmpty(String str) {if (str == null) {return true;}return str.isEmpty();}/*** 字符串判空，去掉所有空格** @param str* @return*/public static boolean isBlank(String str) {if (str == null) {return true;}str = str.replace(" ", "");if (str.indexOf("\t") != -1) {str = str.replace("\t", "");}if (str.indexOf("\n") != -1) {str = str.replace("\n", "");}if (str.indexOf("\r") != -1) {str = str.replace("\r", "");}if (str.indexOf("\f") != -1) {str = str.replace("\f", "");}return isEmpty(str);}}

List 集合工具类：

1. list 集合排序，支持字符串、整形、浮点型、Date类型排序
   …

package com.dengweiping.collection;import com.dengweiping.domain.Test;import java.lang.reflect.Field;
import java.util.*;/*** @description 集合工具类* @author: dengweiping* @time: 2020/6/1 14:49*/
public class ListUtil {/*** 根据指定属性升序排序** @param list         集合* @param propertyName 属性名* @param <T>* @return*/public static <T> List<T> sortAsc(List<T> list, String propertyName) {return sort(list, propertyName, "asc", false);}/*** 根据指定属性升序排序，忽略大小写** @param list         集合* @param propertyName 属性名* @param <T>* @return*/public static <T> List<T> sortAscIgnoreCase(List<T> list, String propertyName) {return sort(list, propertyName, "asc", true);}/*** 根据指定属性降序排序** @param list         集合* @param propertyName 属性名* @param <T>* @return*/public static <T> List<T> sortDesc(List<T> list, String propertyName) {return sort(list, propertyName, "desc", false);}/*** 根据指定属性降序排序，忽略大小写** @param list         集合* @param propertyName 属性名* @param <T>* @return*/public static <T> List<T> sortDescIgnoreCase(List<T> list, String propertyName) {return sort(list, propertyName, "desc", true);}/*** 根据指定方式排序** @param list         集合* @param propertyName 属性名* @param sortType     排序方式 asc：升序 desc：降序* @param <T>* @return*/private static <T> List<T> sort(List<T> list, String propertyName, String sortType, boolean ignoreCase) {Collections.sort(list, (Comparator<Object>) (o1, o2) -> {try {Field field1 = o1.getClass().getDeclaredField(propertyName);Field field2 = o2.getClass().getDeclaredField(propertyName);//打开私有访问field1.setAccessible(true);field2.setAccessible(true);String type = field1.getType().getName();Object obj1 = field1.get(o1);Object obj2 = field2.get(o2);if (obj1 == null) {return -1;} else if (obj2 == null) {return 1;}boolean isAsc = "asc".equals(sortType);switch (type) {case "int":return isAsc ? ((int) obj1 - (int) obj2) : ((int) obj2 - (int) obj1);case "long":case "java.lang.Long":return (long) obj1 > (long) obj2 ? (isAsc ? 1 : -1) : (isAsc ? -1 : 1);case "double":case "java.lang.double":return (double) obj1 > (double) obj2 ? (isAsc ? 1 : -1) : (isAsc ? -1 : 1);case "float":case "java.lang.Float":return (float) obj1 > (float) obj2 ? (isAsc ? 1 : -1) : (isAsc ? -1 : 1);case "java.lang.String"://循环比较次数以字符串短的为准int length = obj1.toString().length() < obj2.toString().length() ? obj1.toString().length() : obj2.toString().length();//是否忽略大小写char[] charArray1 = ignoreCase ? obj1.toString().toLowerCase().toCharArray() : obj1.toString().toCharArray();char[] charArray2 = ignoreCase ? obj2.toString().toLowerCase().toCharArray() : obj2.toString().toCharArray();//比较字符串的ASCII码值for (int i = 0; i < length; i++) {if ((byte) charArray1[i] > (byte) charArray2[i]) {return isAsc ? 1 : -1;} else if ((byte) charArray1[i] < (byte) charArray2[i]) {return isAsc ? -1 : 1;}}//若相同长度部分的字符串都相等，则根据字符串长度比较return isAsc ? (charArray1.length - charArray2.length) : (charArray2.length - charArray1.length);case "java.util.Date":Date d1 = (Date) obj1;Date d2 = (Date) obj2;return d1.getTime() > d2.getTime() ? (isAsc ? 1 : -1) : (isAsc ? -1 : 1);default:throw new RuntimeException("暂不支持 " + type + " 类型的属性排序");}} catch (NoSuchFieldException | IllegalAccessException e) {e.printStackTrace();}return 0;});return list;}
}