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- package com.gyee.impala.common.util;
- import java.math.BigDecimal;
- import java.math.RoundingMode;
- import java.text.ParseException;
- import java.text.SimpleDateFormat;
- import java.util.*;
- import java.util.regex.Matcher;
- import java.util.regex.Pattern;
- /**
- * 字符串工具类
- *
- * @author fc
- */
- public class StringUtil extends org.apache.commons.lang3.StringUtils
- {
- /** 空字符串 */
- private static final String NULLSTR = "";
- /** 下划线 */
- private static final char SEPARATOR = '_';
- /**
- * 获取参数不为空值
- *
- * @param value defaultValue 要判断的value
- * @return value 返回值
- */
- public static <T> T nvl(T value, T defaultValue)
- {
- return value != null ? value : defaultValue;
- }
- /**
- * * 判断一个Collection是否为空, 包含List,Set,Queue
- *
- * @param coll 要判断的Collection
- * @return true:为空 false:非空
- */
- public static boolean isEmpty(Collection<?> coll)
- {
- return isNull(coll) || coll.isEmpty();
- }
- /**
- * * 判断一个Collection是否非空,包含List,Set,Queue
- *
- * @param coll 要判断的Collection
- * @return true:非空 false:空
- */
- public static boolean isNotEmpty(Collection<?> coll)
- {
- return !isEmpty(coll);
- }
- public static int roundToInt(double num) {
- return new BigDecimal(num).setScale(0, RoundingMode.HALF_UP).intValue();
- }
- /**
- * * 判断一个对象数组是否为空
- *
- * @param objects 要判断的对象数组
- ** @return true:为空 false:非空
- */
- public static boolean isEmpty(Object[] objects)
- {
- return isNull(objects) || (objects.length == 0);
- }
- /**
- * * 判断一个对象数组是否非空
- *
- * @param objects 要判断的对象数组
- * @return true:非空 false:空
- */
- public static boolean isNotEmpty(Object[] objects)
- {
- return !isEmpty(objects);
- }
- /**
- * * 判断一个Map是否为空
- *
- * @param map 要判断的Map
- * @return true:为空 false:非空
- */
- public static boolean isEmpty(Map<?, ?> map)
- {
- return isNull(map) || map.isEmpty();
- }
- /**
- * * 判断一个Map是否为空
- *
- * @param map 要判断的Map
- * @return true:非空 false:空
- */
- public static boolean isNotEmpty(Map<?, ?> map)
- {
- return !isEmpty(map);
- }
- /**
- * * 判断一个字符串是否为空串
- *
- * @param str String
- * @return true:为空 false:非空
- */
- public static boolean isEmpty(String str)
- {
- return isNull(str) || NULLSTR.equals(str.trim());
- }
- /**
- * * 判断一个字符串是否为非空串
- *
- * @param str String
- * @return true:非空串 false:空串
- */
- public static boolean isNotEmpty(String str)
- {
- return !isEmpty(str);
- }
- /**
- * * 判断一个对象是否为空
- *
- * @param object Object
- * @return true:为空 false:非空
- */
- public static boolean isNull(Object object)
- {
- return object == null;
- }
- /**
- * * 判断一个对象是否非空
- *
- * @param object Object
- * @return true:非空 false:空
- */
- public static boolean isNotNull(Object object)
- {
- return !isNull(object);
- }
- /**
- * * 判断一个对象是否是数组类型(Java基本型别的数组)
- *
- * @param object 对象
- * @return true:是数组 false:不是数组
- */
- public static boolean isArray(Object object)
- {
- return isNotNull(object) && object.getClass().isArray();
- }
- /**
- * 去空格
- */
- public static String trim(String str)
- {
- return (str == null ? "" : str.trim());
- }
- /**
- * 截取字符串
- *
- * @param str 字符串
- * @param start 开始
- * @return 结果
- */
- public static String substring(final String str, int start)
- {
- if (str == null)
- {
- return NULLSTR;
- }
- if (start < 0)
- {
- start = str.length() + start;
- }
- if (start < 0)
- {
- start = 0;
- }
- if (start > str.length())
- {
- return NULLSTR;
- }
- return str.substring(start);
- }
- /**
- * 截取字符串
- *
- * @param str 字符串
- * @param start 开始
- * @param end 结束
- * @return 结果
- */
- public static String substring(final String str, int start, int end)
- {
- if (str == null)
- {
- return NULLSTR;
- }
- if (end < 0)
- {
- end = str.length() + end;
- }
- if (start < 0)
- {
- start = str.length() + start;
- }
- if (end > str.length())
- {
- end = str.length();
- }
- if (start > end)
- {
- return NULLSTR;
- }
- if (start < 0)
- {
- start = 0;
- }
- if (end < 0)
- {
- end = 0;
- }
- return str.substring(start, end);
- }
- /**
- * 驼峰命名转下划线 nameVc>>name_vc
- */
- public static String toUnderScoreCase(String s)
- {
- if (s == null)
- {
- return null;
- }
- StringBuilder sb = new StringBuilder();
- boolean upperCase = false;
- for (int i = 0; i < s.length(); i++)
- {
- char c = s.charAt(i);
- boolean nextUpperCase = true;
- if (i < (s.length() - 1))
- {
- nextUpperCase = Character.isUpperCase(s.charAt(i + 1));
- }
- if ((i > 0) && Character.isUpperCase(c))
- {
- if (!upperCase || !nextUpperCase)
- {
- sb.append(SEPARATOR);
- }
- upperCase = true;
- }
- else
- {
- upperCase = false;
- }
- sb.append(Character.toLowerCase(c));
- }
- return sb.toString();
- }
- /**
- * 是否包含字符串
- *
- * @param str 验证字符串
- * @param strs 字符串组
- * @return 包含返回true
- */
- public static boolean inStringIgnoreCase(String str, String... strs)
- {
- if (str != null && strs != null)
- {
- for (String s : strs)
- {
- if (str.equalsIgnoreCase(trim(s)))
- {
- return true;
- }
- }
- }
- return false;
- }
-
-
- /**
- * 将下划线大写方式命名的字符串转换为驼峰式。如果转换前的下划线大写方式命名的字符串为空,则返回空字符串。 例如:HELLO_WORLD->HelloWorld
- *
- * @param name 转换前的下划线大写方式命名的字符串
- * @return 转换后的驼峰式命名的字符串
- */
- public static String convertToCamelCase(String name)
- {
- StringBuilder result = new StringBuilder();
- // 快速检查
- if (name == null || name.isEmpty())
- {
- // 没必要转换
- return "";
- }
- else if (!name.contains("_"))
- {
- // 不含下划线,仅将首字母大写
- return name.substring(0, 1).toUpperCase() + name.substring(1);
- }
- // 用下划线将原始字符串分割
- String[] camels = name.split("_");
- for (String camel : camels)
- {
- // 跳过原始字符串中开头、结尾的下换线或双重下划线
- if (camel.isEmpty())
- {
- continue;
- }
- // 首字母大写
- result.append(camel.substring(0, 1).toUpperCase());
- result.append(camel.substring(1).toLowerCase());
- }
- return result.toString();
- }
- /**
- * 首字母大写
- *
- * @param name
- * @return
- */
- public static String firstUpperCase(String name) {
- name = name.substring(0, 1).toUpperCase() + name.substring(1);
- return name;
- }
- /**
- * 首字母小写
- *
- * @param name
- * @return
- */
- public static String firstLowerCase(String name) {
- name = name.substring(0, 1).toLowerCase() + name.substring(1);
- return name;
- }
-
- /**
- * 将下划线转化为大写
- *
- * @param name
- * @param firstCase 首字母是否大写 true:大写 false;小写
- * @return
- */
- public static String upperCase_(String name, boolean firstCase) {
- if(isEmpty(name)){
- return "";
- }
- String[] s = name.split("_");
- StringBuffer stringBuffer = new StringBuffer();
- for (String s1 : s) {
- stringBuffer.append(s1.substring(0, 1).toUpperCase() + s1.substring(1));
- }
- if(!firstCase){
- return firstLowerCase(stringBuffer.toString());
- }
- return stringBuffer.toString();
- }
-
- /**
- * get方法名字转成 t_b_abc>>tBAbc
- * @param str
- * @return
- * @author gyee
- * @Date 2020年1月30日 下午11:55:54
- */
- public static String toFUNName(String str) {
- StringBuffer buffer=new StringBuffer();
- String name=str;
- if(name.contains("_")) {
- // 用下划线将原始字符串分割
- String[] camels = name.split("_");
- boolean b=true;
-
- for (String str1 : camels) {
- if(str1.length()==1&&b) {
- b=false;
- buffer.append(str1);
- }else {
- buffer.append(StringUtil.firstUpperCase(str1));
- }
-
- }
- }else {
- buffer.append(StringUtil.firstUpperCase(name));
- }
- return buffer.toString();
- }
- /**
- * 是否不为空串
- *
- * @param obj
- * @return
- */
- public static boolean notEmp(Object obj) {
- return !empty(obj);
- }
- /**
- * 是否为空串
- *
- * @param obj
- * @return
- */
- public static boolean empty(Object obj) {
- if (obj == null)
- return true;
- String str;
- if (obj instanceof String) {
- str = (String) obj;
- } else {
- str = obj.toString();
- }
- return str.length() == 0;
- }
- public static double round(double num, int digit) {
- return new BigDecimal(num).setScale(digit, RoundingMode.HALF_UP).doubleValue();
- }
- /**
- * 将字符串解析为Date类型
- *
- * @param date
- * @param pattern
- * @return
- */
- public static Date toDate(String date, String pattern) {
- SimpleDateFormat format = new SimpleDateFormat(pattern);
- try {
- return format.parse(date);
- } catch (ParseException e) {
- throw new RuntimeException(String.format("Failed to parse the String [%s] to Date.", date), e);
- }
- }
- /**
- *
- * @方法名称: getUUID
- * @描述: 获得UUID
- * @参数 @return
- * @返回值 String
- * @抛出异常
- */
- public static String getUUID() {
- String s = UUID.randomUUID().toString();
- // 去掉“-”符号
- return s.substring(0, 8) + s.substring(9, 13) + s.substring(14, 18) + s.substring(19, 23) + s.substring(24);
- }
- /**
- * 判断是否为数字字符串
- * @param str
- * @return
- */
- public static boolean isNumeric(String str){
- Pattern pattern = Pattern.compile("^(-?\\d+)(\\.\\d+)?$");
- if(notEmp(str))
- {
- Matcher isNum = pattern.matcher(str);
- if( !isNum.matches() ){
- return false;
- }
- }else
- {
- return false;
- }
- return true;
- }
- /**
- * 正则表达式
- * @param input 需要匹配的字符串
- * @param expression 正则表达公式
- * @return
- */
- public static List<String> pattern(String input, String expression){
- // 创建 Pattern 对象
- Pattern p = Pattern.compile(expression);
- Matcher m = p.matcher(input);
- ArrayList list = new ArrayList();
- while (m.find()) {
- list.add(m.group(0));
- }
- //去除重复值
- HashSet hs=new HashSet(list);
- list.clear();
- list.addAll(hs);
- return list;
- }
- }
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