字符串工具类-StringUtils

蔚落 2022-05-21 08:14 286阅读 0赞

import java.util.Iterator;
    import java.util.Map;
    import java.util.Set;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    /** * Copyright (C), 2011-2018 {company} * FileName: com.common.utils.StringUtils.java * Author: xxx * Email: xxx * Date: 2018/6/23 12:02 * Description: 字符串工具类 * History: * <Author> <Time> <version> <desc> * {xxx} 12:02 1.0 Create */ public class StringUtils {
        private static Pattern linePattern = Pattern.compile("_(\\w)");
        private static Pattern humpPattern = Pattern.compile("[A-Z]");
    
        /** * 划线转驼峰 * @param str * @return */ public static String lineToHump(String str){
            str = str.toLowerCase();
            Matcher matcher = linePattern.matcher(str);
            StringBuffer sb = new StringBuffer();
            while(matcher.find()){
                matcher.appendReplacement(sb, matcher.group(1).toUpperCase());
            }
            matcher.appendTail(sb);
            return sb.toString();
        }
    
        /** * 划线转驼峰（对map中的key进行转换） * @param map * @return */ public static Map lineToHump(Map map){
            if(map == null){
                return null;
            }
            Set keySet = map.keySet();
            for (Iterator i = keySet.iterator(); i.hasNext();) {
                String key = (String) i.next();
                Object value =  map.get(key);
                // 划线转驼峰 String newKey = lineToHump(key);
                map.remove(key);
                map.put(newKey, value);
            }
            return map;
        }
    
        /** * 驼峰转下划线 * @param str * @return */ public static String humpToLine(String str){
            Matcher matcher = humpPattern.matcher(str);
            StringBuffer sb = new StringBuffer();
            while(matcher.find()){
                matcher.appendReplacement(sb, "_"+matcher.group(0).toLowerCase());
            }
            matcher.appendTail(sb);
            return sb.toString();
        }
    
        public static void main(String[] args) {
            System.out.println(lineToHump("cust_no"));
            System.out.println(humpToLine("custNo"));
        }
    }